From patchwork Mon Mar 11 18:00:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xiang X-Patchwork-Id: 13589175 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1C652C54E58 for ; Mon, 11 Mar 2024 18:04:11 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rjjxu-0005Km-JH; Mon, 11 Mar 2024 14:01:34 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjxs-0005K1-A9 for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:32 -0400 Received: from out-176.mta0.migadu.com ([2001:41d0:1004:224b::b0]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjxl-0002s9-Gb for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:32 -0400 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1710180082; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=SXSrRNKG2y6mw2kCVZivpNphMeBgf6+dzpwgsitq+4E=; b=OmoKMN/pJoQe3ezf8C042F5Dz8kLxxBQAVZ/vTUV4KQI3ThfrYy2VF8llIrdZghKVmytb4 9JkExX7fS/5Ab4VXtyJPMmDbuns7dUUsgBCryOWDEmrkmLPqNh2jobd/hxz5MEvT+OSzbk Ft0rULCDzA36x9EyWCQyAcNvBLDltao= From: Hao Xiang To: pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, peterx@redhat.com, farosas@suse.de, eblake@redhat.com, armbru@redhat.com, thuth@redhat.com, lvivier@redhat.com, jdenemar@redhat.com, marcel.apfelbaum@gmail.com, philmd@linaro.org, wangyanan55@huawei.com, qemu-devel@nongnu.org Subject: [PATCH v6 1/7] migration/multifd: Allow zero pages in file migration Date: Mon, 11 Mar 2024 18:00:09 +0000 Message-Id: <20240311180015.3359271-2-hao.xiang@linux.dev> In-Reply-To: <20240311180015.3359271-1-hao.xiang@linux.dev> References: <20240311180015.3359271-1-hao.xiang@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Received-SPF: pass client-ip=2001:41d0:1004:224b::b0; envelope-from=hao.xiang@linux.dev; helo=out-176.mta0.migadu.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Fabiano Rosas Currently, it's an error to have no data pages in the multifd file migration because zero page detection is done in the migration thread and zero pages don't reach multifd. This is enforced with the pages->num assert. We're about to add zero page detection on the multifd thread. Fix the file_write_ramblock_iov() to stop considering p->iovs_num=0 an error. Signed-off-by: Fabiano Rosas --- migration/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/migration/file.c b/migration/file.c index 164b079966..5075f9526f 100644 --- a/migration/file.c +++ b/migration/file.c @@ -159,7 +159,7 @@ void file_start_incoming_migration(FileMigrationArgs *file_args, Error **errp) int file_write_ramblock_iov(QIOChannel *ioc, const struct iovec *iov, int niov, RAMBlock *block, Error **errp) { - ssize_t ret = -1; + ssize_t ret = 0; int i, slice_idx, slice_num; uintptr_t base, next, offset; size_t len; From patchwork Mon Mar 11 18:00:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xiang X-Patchwork-Id: 13589169 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A73E9C54E5D for ; Mon, 11 Mar 2024 18:02:45 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rjjxv-0005LF-Vq; Mon, 11 Mar 2024 14:01:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjxt-0005K9-0F for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:33 -0400 Received: from out-186.mta0.migadu.com ([2001:41d0:1004:224b::ba]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjxn-0002sT-P2 for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:32 -0400 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1710180084; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=wiWWspnbi7Q0vNoPD9xXbXnmFAa8r696Hl2OxFjqnzs=; b=CAXgY7PJ3HNNxGOFDn2NPIdL48DzZO9eescmSsIqLFEWmLdSJd4/+rJWOXrliJ2Whcubbh nE0N/mR9HHJloY19U+9WHqq+npyteZDsJ+4uZ75FMg7+/zG75QrD67UP24Jpof7h2BaaFC qpBP6MAi7mY9kcU4Zn3B9qBD1WWhywA= From: Hao Xiang To: pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, peterx@redhat.com, farosas@suse.de, eblake@redhat.com, armbru@redhat.com, thuth@redhat.com, lvivier@redhat.com, jdenemar@redhat.com, marcel.apfelbaum@gmail.com, philmd@linaro.org, wangyanan55@huawei.com, qemu-devel@nongnu.org Subject: [PATCH v6 2/7] migration/multifd: Allow clearing of the file_bmap from multifd Date: Mon, 11 Mar 2024 18:00:10 +0000 Message-Id: <20240311180015.3359271-3-hao.xiang@linux.dev> In-Reply-To: <20240311180015.3359271-1-hao.xiang@linux.dev> References: <20240311180015.3359271-1-hao.xiang@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Received-SPF: pass client-ip=2001:41d0:1004:224b::ba; envelope-from=hao.xiang@linux.dev; helo=out-186.mta0.migadu.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Fabiano Rosas We currently only need to clear the mapped-ram file bitmap from the migration thread during save_zero_page. We're about to add support for zero page detection on the multifd thread, so allow ramblock_set_file_bmap_atomic() to also clear the bits. Signed-off-by: Fabiano Rosas --- migration/multifd.c | 2 +- migration/ram.c | 8 ++++++-- migration/ram.h | 3 ++- 3 files changed, 9 insertions(+), 4 deletions(-) diff --git a/migration/multifd.c b/migration/multifd.c index d4a44da559..6b8a78e4ca 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -115,7 +115,7 @@ static void multifd_set_file_bitmap(MultiFDSendParams *p) assert(pages->block); for (int i = 0; i < p->pages->num; i++) { - ramblock_set_file_bmap_atomic(pages->block, pages->offset[i]); + ramblock_set_file_bmap_atomic(pages->block, pages->offset[i], true); } } diff --git a/migration/ram.c b/migration/ram.c index 003c28e133..f4abc47bbf 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -3150,9 +3150,13 @@ static void ram_save_file_bmap(QEMUFile *f) } } -void ramblock_set_file_bmap_atomic(RAMBlock *block, ram_addr_t offset) +void ramblock_set_file_bmap_atomic(RAMBlock *block, ram_addr_t offset, bool set) { - set_bit_atomic(offset >> TARGET_PAGE_BITS, block->file_bmap); + if (set) { + set_bit_atomic(offset >> TARGET_PAGE_BITS, block->file_bmap); + } else { + clear_bit_atomic(offset >> TARGET_PAGE_BITS, block->file_bmap); + } } /** diff --git a/migration/ram.h b/migration/ram.h index b9ac0da587..08feecaf51 100644 --- a/migration/ram.h +++ b/migration/ram.h @@ -75,7 +75,8 @@ bool ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *rb, Error **errp); bool ramblock_page_is_discarded(RAMBlock *rb, ram_addr_t start); void postcopy_preempt_shutdown_file(MigrationState *s); void *postcopy_preempt_thread(void *opaque); -void ramblock_set_file_bmap_atomic(RAMBlock *block, ram_addr_t offset); +void ramblock_set_file_bmap_atomic(RAMBlock *block, ram_addr_t offset, + bool set); /* ram cache */ int colo_init_ram_cache(void); From patchwork Mon Mar 11 18:00:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xiang X-Patchwork-Id: 13589170 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A26A7C5475B for ; Mon, 11 Mar 2024 18:02:45 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rjjxv-0005LJ-AE; Mon, 11 Mar 2024 14:01:35 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjxt-0005KP-BC for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:33 -0400 Received: from out-184.mta0.migadu.com ([91.218.175.184]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjxp-0002sq-4M for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:33 -0400 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1710180087; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=R769JfmEyVOIMzlVN65hso0+xIgOCOUWqBq1mzEuFc8=; b=MYYuuYj3lPTcrnngXwC6J2TkMUjXyiK9ss8H2zF2Ve8+zks6ncsYxgaZPDeMu0H1Bci9To xtei26wglW3wAezZJGdVcWitGOMuKbn9PPZGa/FRFsPwNMPn+xuSSh043a1GsLb5r9w84d MmEm6GxW0aNsX8PydLkUDZmHsKTjixI= From: Hao Xiang To: pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, peterx@redhat.com, farosas@suse.de, eblake@redhat.com, armbru@redhat.com, thuth@redhat.com, lvivier@redhat.com, jdenemar@redhat.com, marcel.apfelbaum@gmail.com, philmd@linaro.org, wangyanan55@huawei.com, qemu-devel@nongnu.org Cc: Hao Xiang Subject: [PATCH v6 3/7] migration/multifd: Add new migration option zero-page-detection. Date: Mon, 11 Mar 2024 18:00:11 +0000 Message-Id: <20240311180015.3359271-4-hao.xiang@linux.dev> In-Reply-To: <20240311180015.3359271-1-hao.xiang@linux.dev> References: <20240311180015.3359271-1-hao.xiang@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Received-SPF: pass client-ip=91.218.175.184; envelope-from=hao.xiang@linux.dev; helo=out-184.mta0.migadu.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Hao Xiang This new parameter controls where the zero page checking is running. 1. If this parameter is set to 'legacy', zero page checking is done in the migration main thread. 2. If this parameter is set to 'none', zero page checking is disabled. Signed-off-by: Hao Xiang Reviewed-by: Peter Xu Acked-by: Markus Armbruster Message-Id: <20240301022829.3390548-2-hao.xiang@bytedance.com> --- hw/core/qdev-properties-system.c | 10 +++++++++ include/hw/qdev-properties-system.h | 4 ++++ migration/migration-hmp-cmds.c | 9 ++++++++ migration/options.c | 21 ++++++++++++++++++ migration/options.h | 1 + migration/ram.c | 4 ++++ qapi/migration.json | 33 ++++++++++++++++++++++++++--- 7 files changed, 79 insertions(+), 3 deletions(-) diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c index b45e90edb2..71a21bf24e 100644 --- a/hw/core/qdev-properties-system.c +++ b/hw/core/qdev-properties-system.c @@ -693,6 +693,16 @@ const PropertyInfo qdev_prop_granule_mode = { .set_default_value = qdev_propinfo_set_default_value_enum, }; +const PropertyInfo qdev_prop_zero_page_detection = { + .name = "ZeroPageDetection", + .description = "zero_page_detection values, " + "none,legacy", + .enum_table = &ZeroPageDetection_lookup, + .get = qdev_propinfo_get_enum, + .set = qdev_propinfo_set_enum, + .set_default_value = qdev_propinfo_set_default_value_enum, +}; + /* --- Reserved Region --- */ /* diff --git a/include/hw/qdev-properties-system.h b/include/hw/qdev-properties-system.h index 626be87dd3..438f65389f 100644 --- a/include/hw/qdev-properties-system.h +++ b/include/hw/qdev-properties-system.h @@ -9,6 +9,7 @@ extern const PropertyInfo qdev_prop_reserved_region; extern const PropertyInfo qdev_prop_multifd_compression; extern const PropertyInfo qdev_prop_mig_mode; extern const PropertyInfo qdev_prop_granule_mode; +extern const PropertyInfo qdev_prop_zero_page_detection; extern const PropertyInfo qdev_prop_losttickpolicy; extern const PropertyInfo qdev_prop_blockdev_on_error; extern const PropertyInfo qdev_prop_bios_chs_trans; @@ -50,6 +51,9 @@ extern const PropertyInfo qdev_prop_iothread_vq_mapping_list; MigMode) #define DEFINE_PROP_GRANULE_MODE(_n, _s, _f, _d) \ DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_granule_mode, GranuleMode) +#define DEFINE_PROP_ZERO_PAGE_DETECTION(_n, _s, _f, _d) \ + DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_zero_page_detection, \ + ZeroPageDetection) #define DEFINE_PROP_LOSTTICKPOLICY(_n, _s, _f, _d) \ DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_losttickpolicy, \ LostTickPolicy) diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c index 99b49df5dd..7e96ae6ffd 100644 --- a/migration/migration-hmp-cmds.c +++ b/migration/migration-hmp-cmds.c @@ -344,6 +344,11 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict) monitor_printf(mon, "%s: %s\n", MigrationParameter_str(MIGRATION_PARAMETER_MULTIFD_COMPRESSION), MultiFDCompression_str(params->multifd_compression)); + assert(params->has_zero_page_detection); + monitor_printf(mon, "%s: %s\n", + MigrationParameter_str(MIGRATION_PARAMETER_ZERO_PAGE_DETECTION), + qapi_enum_lookup(&ZeroPageDetection_lookup, + params->zero_page_detection)); monitor_printf(mon, "%s: %" PRIu64 " bytes\n", MigrationParameter_str(MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE), params->xbzrle_cache_size); @@ -634,6 +639,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict) p->has_multifd_zstd_level = true; visit_type_uint8(v, param, &p->multifd_zstd_level, &err); break; + case MIGRATION_PARAMETER_ZERO_PAGE_DETECTION: + p->has_zero_page_detection = true; + visit_type_ZeroPageDetection(v, param, &p->zero_page_detection, &err); + break; case MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE: p->has_xbzrle_cache_size = true; if (!visit_type_size(v, param, &cache_size, &err)) { diff --git a/migration/options.c b/migration/options.c index 40eb930940..8c849620dd 100644 --- a/migration/options.c +++ b/migration/options.c @@ -179,6 +179,9 @@ Property migration_properties[] = { DEFINE_PROP_MIG_MODE("mode", MigrationState, parameters.mode, MIG_MODE_NORMAL), + DEFINE_PROP_ZERO_PAGE_DETECTION("zero-page-detection", MigrationState, + parameters.zero_page_detection, + ZERO_PAGE_DETECTION_LEGACY), /* Migration capabilities */ DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), @@ -931,6 +934,13 @@ uint64_t migrate_xbzrle_cache_size(void) return s->parameters.xbzrle_cache_size; } +ZeroPageDetection migrate_zero_page_detection(void) +{ + MigrationState *s = migrate_get_current(); + + return s->parameters.zero_page_detection; +} + /* parameter setters */ void migrate_set_block_incremental(bool value) @@ -1041,6 +1051,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp) params->vcpu_dirty_limit = s->parameters.vcpu_dirty_limit; params->has_mode = true; params->mode = s->parameters.mode; + params->has_zero_page_detection = true; + params->zero_page_detection = s->parameters.zero_page_detection; return params; } @@ -1077,6 +1089,7 @@ void migrate_params_init(MigrationParameters *params) params->has_x_vcpu_dirty_limit_period = true; params->has_vcpu_dirty_limit = true; params->has_mode = true; + params->has_zero_page_detection = true; } /* @@ -1391,6 +1404,10 @@ static void migrate_params_test_apply(MigrateSetParameters *params, if (params->has_mode) { dest->mode = params->mode; } + + if (params->has_zero_page_detection) { + dest->zero_page_detection = params->zero_page_detection; + } } static void migrate_params_apply(MigrateSetParameters *params, Error **errp) @@ -1541,6 +1558,10 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp) if (params->has_mode) { s->parameters.mode = params->mode; } + + if (params->has_zero_page_detection) { + s->parameters.zero_page_detection = params->zero_page_detection; + } } void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp) diff --git a/migration/options.h b/migration/options.h index 6ddd8dad9b..8b2481385a 100644 --- a/migration/options.h +++ b/migration/options.h @@ -94,6 +94,7 @@ const char *migrate_tls_authz(void); const char *migrate_tls_creds(void); const char *migrate_tls_hostname(void); uint64_t migrate_xbzrle_cache_size(void); +ZeroPageDetection migrate_zero_page_detection(void); /* parameters setters */ diff --git a/migration/ram.c b/migration/ram.c index f4abc47bbf..930061d1eb 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1140,6 +1140,10 @@ static int save_zero_page(RAMState *rs, PageSearchStatus *pss, QEMUFile *file = pss->pss_channel; int len = 0; + if (migrate_zero_page_detection() == ZERO_PAGE_DETECTION_NONE) { + return 0; + } + if (!buffer_is_zero(p, TARGET_PAGE_SIZE)) { return 0; } diff --git a/qapi/migration.json b/qapi/migration.json index 51d188b902..83fdef73b9 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -670,6 +670,18 @@ { 'enum': 'MigMode', 'data': [ 'normal', 'cpr-reboot' ] } +## +# @ZeroPageDetection: +# +# @none: Do not perform zero page checking. +# +# @legacy: Perform zero page checking in main migration thread. +# +# Since: 9.0 +## +{ 'enum': 'ZeroPageDetection', + 'data': [ 'none', 'legacy' ] } + ## # @BitmapMigrationBitmapAliasTransform: # @@ -891,6 +903,10 @@ # @mode: Migration mode. See description in @MigMode. Default is 'normal'. # (Since 8.2) # +# @zero-page-detection: Whether and how to detect zero pages. +# See description in @ZeroPageDetection. Default is 'legacy'. +# (since 9.0) +# # Features: # # @deprecated: Member @block-incremental is deprecated. Use @@ -924,7 +940,8 @@ 'block-bitmap-mapping', { 'name': 'x-vcpu-dirty-limit-period', 'features': ['unstable'] }, 'vcpu-dirty-limit', - 'mode'] } + 'mode', + 'zero-page-detection'] } ## # @MigrateSetParameters: @@ -1083,6 +1100,10 @@ # @mode: Migration mode. See description in @MigMode. Default is 'normal'. # (Since 8.2) # +# @zero-page-detection: Whether and how to detect zero pages. +# See description in @ZeroPageDetection. Default is 'legacy'. +# (since 9.0) +# # Features: # # @deprecated: Member @block-incremental is deprecated. Use @@ -1136,7 +1157,8 @@ '*x-vcpu-dirty-limit-period': { 'type': 'uint64', 'features': [ 'unstable' ] }, '*vcpu-dirty-limit': 'uint64', - '*mode': 'MigMode'} } + '*mode': 'MigMode', + '*zero-page-detection': 'ZeroPageDetection'} } ## # @migrate-set-parameters: @@ -1311,6 +1333,10 @@ # @mode: Migration mode. See description in @MigMode. Default is 'normal'. # (Since 8.2) # +# @zero-page-detection: Whether and how to detect zero pages. +# See description in @ZeroPageDetection. Default is 'legacy'. +# (since 9.0) +# # Features: # # @deprecated: Member @block-incremental is deprecated. Use @@ -1361,7 +1387,8 @@ '*x-vcpu-dirty-limit-period': { 'type': 'uint64', 'features': [ 'unstable' ] }, '*vcpu-dirty-limit': 'uint64', - '*mode': 'MigMode'} } + '*mode': 'MigMode', + '*zero-page-detection': 'ZeroPageDetection'} } ## # @query-migrate-parameters: From patchwork Mon Mar 11 18:00:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xiang X-Patchwork-Id: 13589174 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B08BDC54E5D for ; Mon, 11 Mar 2024 18:03:59 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rjjxy-0005Ma-AZ; Mon, 11 Mar 2024 14:01:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjxw-0005Lr-3N for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:36 -0400 Received: from out-173.mta0.migadu.com ([91.218.175.173]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjxs-0002tM-KL for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:35 -0400 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1710180091; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=J92VlRxJynptul68mXKunAPP+jRycOcRFvAXoKvBlvQ=; b=pLGCtaGc682VeIYkpMpgXIe0uWLk6cMtAF6EUWw9Zh6GDI1megi+Me0RzYOQYqNu+D/F14 cB44zjxxrBQjoMXP79cbgD/ABJcAVNVtk53+8fB4T3lZo0sEvnETw+L4nK1zZNbpJd69ly YzlWETH/AukH4T9P8DtVh/LsOpmR68M= From: Hao Xiang To: pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, peterx@redhat.com, farosas@suse.de, eblake@redhat.com, armbru@redhat.com, thuth@redhat.com, lvivier@redhat.com, jdenemar@redhat.com, marcel.apfelbaum@gmail.com, philmd@linaro.org, wangyanan55@huawei.com, qemu-devel@nongnu.org Cc: Hao Xiang Subject: [PATCH v6 4/7] migration/multifd: Implement zero page transmission on the multifd thread. Date: Mon, 11 Mar 2024 18:00:12 +0000 Message-Id: <20240311180015.3359271-5-hao.xiang@linux.dev> In-Reply-To: <20240311180015.3359271-1-hao.xiang@linux.dev> References: <20240311180015.3359271-1-hao.xiang@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Received-SPF: pass client-ip=91.218.175.173; envelope-from=hao.xiang@linux.dev; helo=out-173.mta0.migadu.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Hao Xiang 1. Add zero_pages field in MultiFDPacket_t. 2. Implements the zero page detection and handling on the multifd threads for non-compression, zlib and zstd compression backends. 3. Added a new value 'multifd' in ZeroPageDetection enumeration. 4. Adds zero page counters and updates multifd send/receive tracing format to track the newly added counters. Signed-off-by: Hao Xiang Acked-by: Markus Armbruster Reviewed-by: Fabiano Rosas --- hw/core/qdev-properties-system.c | 2 +- migration/meson.build | 1 + migration/multifd-zero-page.c | 87 ++++++++++++++++++++++++++++++ migration/multifd-zlib.c | 21 ++++++-- migration/multifd-zstd.c | 20 +++++-- migration/multifd.c | 90 +++++++++++++++++++++++++++----- migration/multifd.h | 23 +++++++- migration/ram.c | 1 - migration/trace-events | 8 +-- qapi/migration.json | 7 ++- 10 files changed, 228 insertions(+), 32 deletions(-) create mode 100644 migration/multifd-zero-page.c diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c index 71a21bf24e..7eca2f2377 100644 --- a/hw/core/qdev-properties-system.c +++ b/hw/core/qdev-properties-system.c @@ -696,7 +696,7 @@ const PropertyInfo qdev_prop_granule_mode = { const PropertyInfo qdev_prop_zero_page_detection = { .name = "ZeroPageDetection", .description = "zero_page_detection values, " - "none,legacy", + "none,legacy,multifd", .enum_table = &ZeroPageDetection_lookup, .get = qdev_propinfo_get_enum, .set = qdev_propinfo_set_enum, diff --git a/migration/meson.build b/migration/meson.build index 92b1cc4297..1eeb915ff6 100644 --- a/migration/meson.build +++ b/migration/meson.build @@ -22,6 +22,7 @@ system_ss.add(files( 'migration.c', 'multifd.c', 'multifd-zlib.c', + 'multifd-zero-page.c', 'ram-compress.c', 'options.c', 'postcopy-ram.c', diff --git a/migration/multifd-zero-page.c b/migration/multifd-zero-page.c new file mode 100644 index 0000000000..1ba38be636 --- /dev/null +++ b/migration/multifd-zero-page.c @@ -0,0 +1,87 @@ +/* + * Multifd zero page detection implementation. + * + * Copyright (c) 2024 Bytedance Inc + * + * Authors: + * Hao Xiang + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qemu/cutils.h" +#include "exec/ramblock.h" +#include "migration.h" +#include "multifd.h" +#include "options.h" +#include "ram.h" + +static bool multifd_zero_page_enabled(void) +{ + return migrate_zero_page_detection() == ZERO_PAGE_DETECTION_MULTIFD; +} + +static void swap_page_offset(ram_addr_t *pages_offset, int a, int b) +{ + ram_addr_t temp; + + if (a == b) { + return; + } + + temp = pages_offset[a]; + pages_offset[a] = pages_offset[b]; + pages_offset[b] = temp; +} + +/** + * multifd_send_zero_page_detect: Perform zero page detection on all pages. + * + * Sorts normal pages before zero pages in p->pages->offset and updates + * p->pages->normal_num. + * + * @param p A pointer to the send params. + */ +void multifd_send_zero_page_detect(MultiFDSendParams *p) +{ + MultiFDPages_t *pages = p->pages; + RAMBlock *rb = pages->block; + int i = 0; + int j = pages->num - 1; + + if (!multifd_zero_page_enabled()) { + pages->normal_num = pages->num; + return; + } + + /* + * Sort the page offset array by moving all normal pages to + * the left and all zero pages to the right of the array. + */ + while (i <= j) { + uint64_t offset = pages->offset[i]; + + if (!buffer_is_zero(rb->host + offset, p->page_size)) { + i++; + continue; + } + + swap_page_offset(pages->offset, i, j); + ram_release_page(rb->idstr, offset); + j--; + } + + pages->normal_num = i; +} + +void multifd_recv_zero_page_process(MultiFDRecvParams *p) +{ + for (int i = 0; i < p->zero_num; i++) { + void *page = p->host + p->zero[i]; + if (!buffer_is_zero(page, p->page_size)) { + memset(page, 0, p->page_size); + } + } +} diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c index 6120faad65..83c0374380 100644 --- a/migration/multifd-zlib.c +++ b/migration/multifd-zlib.c @@ -123,13 +123,15 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp) int ret; uint32_t i; - multifd_send_prepare_header(p); + if (!multifd_send_prepare_common(p)) { + goto out; + } - for (i = 0; i < pages->num; i++) { + for (i = 0; i < pages->normal_num; i++) { uint32_t available = z->zbuff_len - out_size; int flush = Z_NO_FLUSH; - if (i == pages->num - 1) { + if (i == pages->normal_num - 1) { flush = Z_SYNC_FLUSH; } @@ -172,10 +174,10 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp) p->iov[p->iovs_num].iov_len = out_size; p->iovs_num++; p->next_packet_size = out_size; - p->flags |= MULTIFD_FLAG_ZLIB; +out: + p->flags |= MULTIFD_FLAG_ZLIB; multifd_send_fill_packet(p); - return 0; } @@ -261,6 +263,14 @@ static int zlib_recv(MultiFDRecvParams *p, Error **errp) p->id, flags, MULTIFD_FLAG_ZLIB); return -1; } + + multifd_recv_zero_page_process(p); + + if (!p->normal_num) { + assert(in_size == 0); + return 0; + } + ret = qio_channel_read_all(p->c, (void *)z->zbuff, in_size, errp); if (ret != 0) { @@ -310,6 +320,7 @@ static int zlib_recv(MultiFDRecvParams *p, Error **errp) p->id, out_size, expected_size); return -1; } + return 0; } diff --git a/migration/multifd-zstd.c b/migration/multifd-zstd.c index cac236833d..02112255ad 100644 --- a/migration/multifd-zstd.c +++ b/migration/multifd-zstd.c @@ -118,16 +118,18 @@ static int zstd_send_prepare(MultiFDSendParams *p, Error **errp) int ret; uint32_t i; - multifd_send_prepare_header(p); + if (!multifd_send_prepare_common(p)) { + goto out; + } z->out.dst = z->zbuff; z->out.size = z->zbuff_len; z->out.pos = 0; - for (i = 0; i < pages->num; i++) { + for (i = 0; i < pages->normal_num; i++) { ZSTD_EndDirective flush = ZSTD_e_continue; - if (i == pages->num - 1) { + if (i == pages->normal_num - 1) { flush = ZSTD_e_flush; } z->in.src = p->pages->block->host + pages->offset[i]; @@ -161,10 +163,10 @@ static int zstd_send_prepare(MultiFDSendParams *p, Error **errp) p->iov[p->iovs_num].iov_len = z->out.pos; p->iovs_num++; p->next_packet_size = z->out.pos; - p->flags |= MULTIFD_FLAG_ZSTD; +out: + p->flags |= MULTIFD_FLAG_ZSTD; multifd_send_fill_packet(p); - return 0; } @@ -257,6 +259,14 @@ static int zstd_recv(MultiFDRecvParams *p, Error **errp) p->id, flags, MULTIFD_FLAG_ZSTD); return -1; } + + multifd_recv_zero_page_process(p); + + if (!p->normal_num) { + assert(in_size == 0); + return 0; + } + ret = qio_channel_read_all(p->c, (void *)z->zbuff, in_size, errp); if (ret != 0) { diff --git a/migration/multifd.c b/migration/multifd.c index 6b8a78e4ca..8a4db550a2 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -11,6 +11,7 @@ */ #include "qemu/osdep.h" +#include "qemu/cutils.h" #include "qemu/rcu.h" #include "exec/target_page.h" #include "sysemu/sysemu.h" @@ -111,12 +112,17 @@ void multifd_send_channel_created(void) static void multifd_set_file_bitmap(MultiFDSendParams *p) { MultiFDPages_t *pages = p->pages; + uint32_t zero_num = p->pages->num - p->pages->normal_num; assert(pages->block); - for (int i = 0; i < p->pages->num; i++) { + for (int i = 0; i < p->pages->normal_num; i++) { ramblock_set_file_bmap_atomic(pages->block, pages->offset[i], true); } + + for (int i = p->pages->num; i < zero_num; i++) { + ramblock_set_file_bmap_atomic(pages->block, pages->offset[i], false); + } } /* Multifd without compression */ @@ -153,13 +159,13 @@ static void multifd_send_prepare_iovs(MultiFDSendParams *p) { MultiFDPages_t *pages = p->pages; - for (int i = 0; i < pages->num; i++) { + for (int i = 0; i < pages->normal_num; i++) { p->iov[p->iovs_num].iov_base = pages->block->host + pages->offset[i]; p->iov[p->iovs_num].iov_len = p->page_size; p->iovs_num++; } - p->next_packet_size = pages->num * p->page_size; + p->next_packet_size = pages->normal_num * p->page_size; } /** @@ -178,6 +184,8 @@ static int nocomp_send_prepare(MultiFDSendParams *p, Error **errp) bool use_zero_copy_send = migrate_zero_copy_send(); int ret; + multifd_send_zero_page_detect(p); + if (!multifd_use_packets()) { multifd_send_prepare_iovs(p); multifd_set_file_bitmap(p); @@ -261,6 +269,13 @@ static int nocomp_recv(MultiFDRecvParams *p, Error **errp) p->id, flags, MULTIFD_FLAG_NOCOMP); return -1; } + + multifd_recv_zero_page_process(p); + + if (!p->normal_num) { + return 0; + } + for (int i = 0; i < p->normal_num; i++) { p->iov[i].iov_base = p->host + p->normal[i]; p->iov[i].iov_len = p->page_size; @@ -295,6 +310,7 @@ static void multifd_pages_reset(MultiFDPages_t *pages) * overwritten later when reused. */ pages->num = 0; + pages->normal_num = 0; pages->block = NULL; } @@ -386,11 +402,13 @@ void multifd_send_fill_packet(MultiFDSendParams *p) MultiFDPacket_t *packet = p->packet; MultiFDPages_t *pages = p->pages; uint64_t packet_num; + uint32_t zero_num = pages->num - pages->normal_num; int i; packet->flags = cpu_to_be32(p->flags); packet->pages_alloc = cpu_to_be32(p->pages->allocated); - packet->normal_pages = cpu_to_be32(pages->num); + packet->normal_pages = cpu_to_be32(pages->normal_num); + packet->zero_pages = cpu_to_be32(zero_num); packet->next_packet_size = cpu_to_be32(p->next_packet_size); packet_num = qatomic_fetch_inc(&multifd_send_state->packet_num); @@ -408,10 +426,11 @@ void multifd_send_fill_packet(MultiFDSendParams *p) } p->packets_sent++; - p->total_normal_pages += pages->num; + p->total_normal_pages += pages->normal_num; + p->total_zero_pages += zero_num; - trace_multifd_send(p->id, packet_num, pages->num, p->flags, - p->next_packet_size); + trace_multifd_send(p->id, packet_num, pages->normal_num, zero_num, + p->flags, p->next_packet_size); } static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) @@ -452,20 +471,29 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) p->normal_num = be32_to_cpu(packet->normal_pages); if (p->normal_num > packet->pages_alloc) { error_setg(errp, "multifd: received packet " - "with %u pages and expected maximum pages are %u", + "with %u normal pages and expected maximum pages are %u", p->normal_num, packet->pages_alloc) ; return -1; } + p->zero_num = be32_to_cpu(packet->zero_pages); + if (p->zero_num > packet->pages_alloc - p->normal_num) { + error_setg(errp, "multifd: received packet " + "with %u zero pages and expected maximum zero pages are %u", + p->zero_num, packet->pages_alloc - p->normal_num) ; + return -1; + } + p->next_packet_size = be32_to_cpu(packet->next_packet_size); p->packet_num = be64_to_cpu(packet->packet_num); p->packets_recved++; p->total_normal_pages += p->normal_num; + p->total_zero_pages += p->zero_num; - trace_multifd_recv(p->id, p->packet_num, p->normal_num, p->flags, - p->next_packet_size); + trace_multifd_recv(p->id, p->packet_num, p->normal_num, p->zero_num, + p->flags, p->next_packet_size); - if (p->normal_num == 0) { + if (p->normal_num == 0 && p->zero_num == 0) { return 0; } @@ -491,6 +519,18 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) p->normal[i] = offset; } + for (i = 0; i < p->zero_num; i++) { + uint64_t offset = be64_to_cpu(packet->offset[p->normal_num + i]); + + if (offset > (p->block->used_length - p->page_size)) { + error_setg(errp, "multifd: offset too long %" PRIu64 + " (max " RAM_ADDR_FMT ")", + offset, p->block->used_length); + return -1; + } + p->zero[i] = offset; + } + return 0; } @@ -908,6 +948,8 @@ static void *multifd_send_thread(void *opaque) stat64_add(&mig_stats.multifd_bytes, p->next_packet_size + p->packet_len); + stat64_add(&mig_stats.normal_pages, pages->normal_num); + stat64_add(&mig_stats.zero_pages, pages->num - pages->normal_num); multifd_pages_reset(p->pages); p->next_packet_size = 0; @@ -955,7 +997,8 @@ out: rcu_unregister_thread(); migration_threads_remove(thread); - trace_multifd_send_thread_end(p->id, p->packets_sent, p->total_normal_pages); + trace_multifd_send_thread_end(p->id, p->packets_sent, p->total_normal_pages, + p->total_zero_pages); return NULL; } @@ -1306,6 +1349,8 @@ static void multifd_recv_cleanup_channel(MultiFDRecvParams *p) p->iov = NULL; g_free(p->normal); p->normal = NULL; + g_free(p->zero); + p->zero = NULL; multifd_recv_state->ops->recv_cleanup(p); } @@ -1439,7 +1484,7 @@ static void *multifd_recv_thread(void *opaque) flags = p->flags; /* recv methods don't know how to handle the SYNC flag */ p->flags &= ~MULTIFD_FLAG_SYNC; - has_data = !!p->normal_num; + has_data = p->normal_num || p->zero_num; qemu_mutex_unlock(&p->mutex); } else { /* @@ -1497,7 +1542,9 @@ static void *multifd_recv_thread(void *opaque) } rcu_unregister_thread(); - trace_multifd_recv_thread_end(p->id, p->packets_recved, p->total_normal_pages); + trace_multifd_recv_thread_end(p->id, p->packets_recved, + p->total_normal_pages, + p->total_zero_pages); return NULL; } @@ -1549,6 +1596,7 @@ int multifd_recv_setup(Error **errp) p->name = g_strdup_printf("multifdrecv_%d", i); p->iov = g_new0(struct iovec, page_count); p->normal = g_new0(ram_addr_t, page_count); + p->zero = g_new0(ram_addr_t, page_count); p->page_count = page_count; p->page_size = qemu_target_page_size(); } @@ -1623,3 +1671,17 @@ void multifd_recv_new_channel(QIOChannel *ioc, Error **errp) QEMU_THREAD_JOINABLE); qatomic_inc(&multifd_recv_state->count); } + +bool multifd_send_prepare_common(MultiFDSendParams *p) +{ + multifd_send_zero_page_detect(p); + + if (!p->pages->normal_num) { + p->next_packet_size = 0; + return false; + } + + multifd_send_prepare_header(p); + + return true; +} diff --git a/migration/multifd.h b/migration/multifd.h index 7447c2bea3..c9d9b09239 100644 --- a/migration/multifd.h +++ b/migration/multifd.h @@ -55,14 +55,24 @@ typedef struct { /* size of the next packet that contains pages */ uint32_t next_packet_size; uint64_t packet_num; - uint64_t unused[4]; /* Reserved for future use */ + /* zero pages */ + uint32_t zero_pages; + uint32_t unused32[1]; /* Reserved for future use */ + uint64_t unused64[3]; /* Reserved for future use */ char ramblock[256]; + /* + * This array contains the pointers to: + * - normal pages (initial normal_pages entries) + * - zero pages (following zero_pages entries) + */ uint64_t offset[]; } __attribute__((packed)) MultiFDPacket_t; typedef struct { /* number of used pages */ uint32_t num; + /* number of normal pages */ + uint32_t normal_num; /* number of allocated pages */ uint32_t allocated; /* offset of each page */ @@ -136,6 +146,8 @@ typedef struct { uint64_t packets_sent; /* non zero pages sent through this channel */ uint64_t total_normal_pages; + /* zero pages sent through this channel */ + uint64_t total_zero_pages; /* buffers to send */ struct iovec *iov; /* number of iovs used */ @@ -194,12 +206,18 @@ typedef struct { uint8_t *host; /* non zero pages recv through this channel */ uint64_t total_normal_pages; + /* zero pages recv through this channel */ + uint64_t total_zero_pages; /* buffers to recv */ struct iovec *iov; /* Pages that are not zero */ ram_addr_t *normal; /* num of non zero pages */ uint32_t normal_num; + /* Pages that are zero */ + ram_addr_t *zero; + /* num of zero pages */ + uint32_t zero_num; /* used for de-compression methods */ void *compress_data; } MultiFDRecvParams; @@ -221,6 +239,9 @@ typedef struct { void multifd_register_ops(int method, MultiFDMethods *ops); void multifd_send_fill_packet(MultiFDSendParams *p); +bool multifd_send_prepare_common(MultiFDSendParams *p); +void multifd_send_zero_page_detect(MultiFDSendParams *p); +void multifd_recv_zero_page_process(MultiFDRecvParams *p); static inline void multifd_send_prepare_header(MultiFDSendParams *p) { diff --git a/migration/ram.c b/migration/ram.c index 930061d1eb..d1f97cf862 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1288,7 +1288,6 @@ static int ram_save_multifd_page(RAMBlock *block, ram_addr_t offset) if (!multifd_queue_page(block, offset)) { return -1; } - stat64_add(&mig_stats.normal_pages, 1); return 1; } diff --git a/migration/trace-events b/migration/trace-events index bf1a069632..f0e1cb80c7 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -128,21 +128,21 @@ postcopy_preempt_reset_channel(void) "" # multifd.c multifd_new_send_channel_async(uint8_t id) "channel %u" multifd_new_send_channel_async_error(uint8_t id, void *err) "channel=%u err=%p" -multifd_recv(uint8_t id, uint64_t packet_num, uint32_t used, uint32_t flags, uint32_t next_packet_size) "channel %u packet_num %" PRIu64 " pages %u flags 0x%x next packet size %u" +multifd_recv(uint8_t id, uint64_t packet_num, uint32_t normal, uint32_t zero, uint32_t flags, uint32_t next_packet_size) "channel %u packet_num %" PRIu64 " normal pages %u zero pages %u flags 0x%x next packet size %u" multifd_recv_new_channel(uint8_t id) "channel %u" multifd_recv_sync_main(long packet_num) "packet num %ld" multifd_recv_sync_main_signal(uint8_t id) "channel %u" multifd_recv_sync_main_wait(uint8_t id) "iter %u" multifd_recv_terminate_threads(bool error) "error %d" -multifd_recv_thread_end(uint8_t id, uint64_t packets, uint64_t pages) "channel %u packets %" PRIu64 " pages %" PRIu64 +multifd_recv_thread_end(uint8_t id, uint64_t packets, uint64_t normal_pages, uint64_t zero_pages) "channel %u packets %" PRIu64 " normal pages %" PRIu64 " zero pages %" PRIu64 multifd_recv_thread_start(uint8_t id) "%u" -multifd_send(uint8_t id, uint64_t packet_num, uint32_t normal, uint32_t flags, uint32_t next_packet_size) "channel %u packet_num %" PRIu64 " normal pages %u flags 0x%x next packet size %u" +multifd_send(uint8_t id, uint64_t packet_num, uint32_t normal_pages, uint32_t zero_pages, uint32_t flags, uint32_t next_packet_size) "channel %u packet_num %" PRIu64 " normal pages %u zero pages %u flags 0x%x next packet size %u" multifd_send_error(uint8_t id) "channel %u" multifd_send_sync_main(long packet_num) "packet num %ld" multifd_send_sync_main_signal(uint8_t id) "channel %u" multifd_send_sync_main_wait(uint8_t id) "channel %u" multifd_send_terminate_threads(void) "" -multifd_send_thread_end(uint8_t id, uint64_t packets, uint64_t normal_pages) "channel %u packets %" PRIu64 " normal pages %" PRIu64 +multifd_send_thread_end(uint8_t id, uint64_t packets, uint64_t normal_pages, uint64_t zero_pages) "channel %u packets %" PRIu64 " normal pages %" PRIu64 " zero pages %" PRIu64 multifd_send_thread_start(uint8_t id) "%u" multifd_tls_outgoing_handshake_start(void *ioc, void *tioc, const char *hostname) "ioc=%p tioc=%p hostname=%s" multifd_tls_outgoing_handshake_error(void *ioc, const char *err) "ioc=%p err=%s" diff --git a/qapi/migration.json b/qapi/migration.json index 83fdef73b9..2684e4e9ac 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -677,10 +677,15 @@ # # @legacy: Perform zero page checking in main migration thread. # +# @multifd: Perform zero page checking in multifd sender thread if +# multifd migration is enabled, else in the main migration +# thread as for @legacy. +# # Since: 9.0 +# ## { 'enum': 'ZeroPageDetection', - 'data': [ 'none', 'legacy' ] } + 'data': [ 'none', 'legacy', 'multifd' ] } ## # @BitmapMigrationBitmapAliasTransform: From patchwork Mon Mar 11 18:00:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xiang X-Patchwork-Id: 13589173 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A5F2DC54E58 for ; Mon, 11 Mar 2024 18:03:57 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rjjxz-0005N2-FU; Mon, 11 Mar 2024 14:01:39 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjxy-0005Mc-9i for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:38 -0400 Received: from out-188.mta0.migadu.com ([2001:41d0:1004:224b::bc]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjxw-0002uG-Ep for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:38 -0400 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1710180094; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rLb7ftKP10iFOR1PFB6C4W+WcjWJbkyogMMoy+Sli38=; b=JQ2oECGJZP+xGY8mcK4oVSEpx8v9ZnIe/qjjrRsujSZcttMfUtRfq9Zr0lot5rDdjexJCe elMDOWsgVU9Cr8wsJe9xSNtTyx+ifrdN7++esSwHzP/x4d5FbmPoSv2Xo8gJhHZqFzA7AN AdtQD/HeeqhMoF4D4Zd2iAW6Uho7cJI= From: Hao Xiang To: pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, peterx@redhat.com, farosas@suse.de, eblake@redhat.com, armbru@redhat.com, thuth@redhat.com, lvivier@redhat.com, jdenemar@redhat.com, marcel.apfelbaum@gmail.com, philmd@linaro.org, wangyanan55@huawei.com, qemu-devel@nongnu.org Cc: Hao Xiang Subject: [PATCH v6 5/7] migration/multifd: Implement ram_save_target_page_multifd to handle multifd version of MigrationOps::ram_save_target_page. Date: Mon, 11 Mar 2024 18:00:13 +0000 Message-Id: <20240311180015.3359271-6-hao.xiang@linux.dev> In-Reply-To: <20240311180015.3359271-1-hao.xiang@linux.dev> References: <20240311180015.3359271-1-hao.xiang@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Received-SPF: pass client-ip=2001:41d0:1004:224b::bc; envelope-from=hao.xiang@linux.dev; helo=out-188.mta0.migadu.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Hao Xiang 1. Add a dedicated handler for MigrationOps::ram_save_target_page in multifd live migration. 2. Refactor ram_save_target_page_legacy so that the legacy and multifd handlers don't have internal functions calling into each other. Signed-off-by: Hao Xiang Reviewed-by: Fabiano Rosas Message-Id: <20240226195654.934709-4-hao.xiang@bytedance.com> --- migration/ram.c | 38 +++++++++++++++++++++++++++++--------- 1 file changed, 29 insertions(+), 9 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index d1f97cf862..1d52b5c37f 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2079,7 +2079,6 @@ static bool save_compress_page(RAMState *rs, PageSearchStatus *pss, */ static int ram_save_target_page_legacy(RAMState *rs, PageSearchStatus *pss) { - RAMBlock *block = pss->block; ram_addr_t offset = ((ram_addr_t)pss->page) << TARGET_PAGE_BITS; int res; @@ -2095,17 +2094,33 @@ static int ram_save_target_page_legacy(RAMState *rs, PageSearchStatus *pss) return 1; } + return ram_save_page(rs, pss); +} + +/** + * ram_save_target_page_multifd: send one target page to multifd workers + * + * Returns 1 if the page was queued, -1 otherwise. + * + * @rs: current RAM state + * @pss: data about the page we want to send + */ +static int ram_save_target_page_multifd(RAMState *rs, PageSearchStatus *pss) +{ + RAMBlock *block = pss->block; + ram_addr_t offset = ((ram_addr_t)pss->page) << TARGET_PAGE_BITS; + /* - * Do not use multifd in postcopy as one whole host page should be - * placed. Meanwhile postcopy requires atomic update of pages, so even - * if host page size == guest page size the dest guest during run may - * still see partially copied pages which is data corruption. + * While using multifd live migration, we still need to handle zero + * page checking on the migration main thread. */ - if (migrate_multifd() && !migration_in_postcopy()) { - return ram_save_multifd_page(block, offset); + if (migrate_zero_page_detection() == ZERO_PAGE_DETECTION_LEGACY) { + if (save_zero_page(rs, pss, offset)) { + return 1; + } } - return ram_save_page(rs, pss); + return ram_save_multifd_page(block, offset); } /* Should be called before sending a host page */ @@ -3113,7 +3128,12 @@ static int ram_save_setup(QEMUFile *f, void *opaque) } migration_ops = g_malloc0(sizeof(MigrationOps)); - migration_ops->ram_save_target_page = ram_save_target_page_legacy; + + if (migrate_multifd()) { + migration_ops->ram_save_target_page = ram_save_target_page_multifd; + } else { + migration_ops->ram_save_target_page = ram_save_target_page_legacy; + } bql_unlock(); ret = multifd_send_sync_main(); From patchwork Mon Mar 11 18:00:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xiang X-Patchwork-Id: 13589171 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4BC35C5475B for ; Mon, 11 Mar 2024 18:02:48 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rjjy8-0005PM-6O; Mon, 11 Mar 2024 14:01:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjy2-0005PA-5x for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:42 -0400 Received: from out-180.mta0.migadu.com ([91.218.175.180]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjxz-0002ui-Cb for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:41 -0400 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1710180097; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=raHbR+3aJ1OqO7Ee0/aS7Kg2+66MX0gCeuiZHMCm28s=; b=FlGtH3bst84GX+/I8Tdm9dDINa/1dMOHjqKYVgGety6Zr7kl3XN2qdWi+LQDZljVb/lzxT evAD9w1Ow69aopBimBEUV2psZWcBZv+Bm8er3N/oSz7bI6b7yuu79fzGX9pDM+Lh1w8njT ORhMoG3HOOuir8laQ8sb3U9iLssYuGg= From: Hao Xiang To: pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, peterx@redhat.com, farosas@suse.de, eblake@redhat.com, armbru@redhat.com, thuth@redhat.com, lvivier@redhat.com, jdenemar@redhat.com, marcel.apfelbaum@gmail.com, philmd@linaro.org, wangyanan55@huawei.com, qemu-devel@nongnu.org Cc: Hao Xiang Subject: [PATCH v6 6/7] migration/multifd: Enable multifd zero page checking by default. Date: Mon, 11 Mar 2024 18:00:14 +0000 Message-Id: <20240311180015.3359271-7-hao.xiang@linux.dev> In-Reply-To: <20240311180015.3359271-1-hao.xiang@linux.dev> References: <20240311180015.3359271-1-hao.xiang@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Received-SPF: pass client-ip=91.218.175.180; envelope-from=hao.xiang@linux.dev; helo=out-180.mta0.migadu.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Hao Xiang 1. Set default "zero-page-detection" option to "multifd". Now zero page checking can be done in the multifd threads and this becomes the default configuration. 2. Handle migration QEMU9.0 -> QEMU8.2 compatibility. We provide backward compatibility where zero page checking is done from the migration main thread. Signed-off-by: Hao Xiang Reviewed-by: Peter Xu Reviewed-by: Fabiano Rosas --- hw/core/machine.c | 4 +++- migration/options.c | 2 +- qapi/migration.json | 6 +++--- 3 files changed, 7 insertions(+), 5 deletions(-) diff --git a/hw/core/machine.c b/hw/core/machine.c index 9ac5d5389a..0e9d646b61 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -32,7 +32,9 @@ #include "hw/virtio/virtio-net.h" #include "audio/audio.h" -GlobalProperty hw_compat_8_2[] = {}; +GlobalProperty hw_compat_8_2[] = { + { "migration", "zero-page-detection", "legacy"}, +}; const size_t hw_compat_8_2_len = G_N_ELEMENTS(hw_compat_8_2); GlobalProperty hw_compat_8_1[] = { diff --git a/migration/options.c b/migration/options.c index 8c849620dd..d61d31be24 100644 --- a/migration/options.c +++ b/migration/options.c @@ -181,7 +181,7 @@ Property migration_properties[] = { MIG_MODE_NORMAL), DEFINE_PROP_ZERO_PAGE_DETECTION("zero-page-detection", MigrationState, parameters.zero_page_detection, - ZERO_PAGE_DETECTION_LEGACY), + ZERO_PAGE_DETECTION_MULTIFD), /* Migration capabilities */ DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), diff --git a/qapi/migration.json b/qapi/migration.json index 2684e4e9ac..aa1b39bce1 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -909,7 +909,7 @@ # (Since 8.2) # # @zero-page-detection: Whether and how to detect zero pages. -# See description in @ZeroPageDetection. Default is 'legacy'. +# See description in @ZeroPageDetection. Default is 'multifd'. # (since 9.0) # # Features: @@ -1106,7 +1106,7 @@ # (Since 8.2) # # @zero-page-detection: Whether and how to detect zero pages. -# See description in @ZeroPageDetection. Default is 'legacy'. +# See description in @ZeroPageDetection. Default is 'multifd'. # (since 9.0) # # Features: @@ -1339,7 +1339,7 @@ # (Since 8.2) # # @zero-page-detection: Whether and how to detect zero pages. -# See description in @ZeroPageDetection. Default is 'legacy'. +# See description in @ZeroPageDetection. Default is 'multifd'. # (since 9.0) # # Features: From patchwork Mon Mar 11 18:00:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xiang X-Patchwork-Id: 13589172 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 05DF6C5475B for ; Mon, 11 Mar 2024 18:03:01 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rjjy9-0005QL-KU; Mon, 11 Mar 2024 14:01:49 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjy5-0005PN-12 for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:46 -0400 Received: from out-177.mta0.migadu.com ([91.218.175.177]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rjjy3-0002x2-8O for qemu-devel@nongnu.org; Mon, 11 Mar 2024 14:01:44 -0400 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1710180101; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=cOs1PeLU/M6BfmOBHauhQFryX1tplw+VBeDONscOOAY=; b=bMu3rHtBBQqRMOBgMObAON0S1zJ95NhsAfXl8y6NOgb0mkLwPdVDGL7SBWbjh2gPqSKe40 AFC9seME7ooZlOvnUoRwBmXkUCqXTKbWYRjr6XHn5eA5MuxNIQPyUM+302PsUIyCEr2D3H ezsGwsUenLonkqER0JZbu/xyTC3Xfl8= From: Hao Xiang To: pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, peterx@redhat.com, farosas@suse.de, eblake@redhat.com, armbru@redhat.com, thuth@redhat.com, lvivier@redhat.com, jdenemar@redhat.com, marcel.apfelbaum@gmail.com, philmd@linaro.org, wangyanan55@huawei.com, qemu-devel@nongnu.org Cc: Hao Xiang Subject: [PATCH v6 7/7] migration/multifd: Add new migration test cases for legacy zero page checking. Date: Mon, 11 Mar 2024 18:00:15 +0000 Message-Id: <20240311180015.3359271-8-hao.xiang@linux.dev> In-Reply-To: <20240311180015.3359271-1-hao.xiang@linux.dev> References: <20240311180015.3359271-1-hao.xiang@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Received-SPF: pass client-ip=91.218.175.177; envelope-from=hao.xiang@linux.dev; helo=out-177.mta0.migadu.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Hao Xiang Now that zero page checking is done on the multifd sender threads by default, we still provide an option for backward compatibility. This change adds a qtest migration test case to set the zero-page-detection option to "legacy" and run multifd migration with zero page checking on the migration main thread. Signed-off-by: Hao Xiang Reviewed-by: Peter Xu Message-Id: <20240301022829.3390548-6-hao.xiang@bytedance.com> --- tests/qtest/migration-test.c | 52 ++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c index 4023d808f9..71895abb7f 100644 --- a/tests/qtest/migration-test.c +++ b/tests/qtest/migration-test.c @@ -2771,6 +2771,24 @@ test_migrate_precopy_tcp_multifd_start(QTestState *from, return test_migrate_precopy_tcp_multifd_start_common(from, to, "none"); } +static void * +test_migrate_precopy_tcp_multifd_start_zero_page_legacy(QTestState *from, + QTestState *to) +{ + test_migrate_precopy_tcp_multifd_start_common(from, to, "none"); + migrate_set_parameter_str(from, "zero-page-detection", "legacy"); + return NULL; +} + +static void * +test_migration_precopy_tcp_multifd_start_no_zero_page(QTestState *from, + QTestState *to) +{ + test_migrate_precopy_tcp_multifd_start_common(from, to, "none"); + migrate_set_parameter_str(from, "zero-page-detection", "none"); + return NULL; +} + static void * test_migrate_precopy_tcp_multifd_zlib_start(QTestState *from, QTestState *to) @@ -2812,6 +2830,36 @@ static void test_multifd_tcp_none(void) test_precopy_common(&args); } +static void test_multifd_tcp_zero_page_legacy(void) +{ + MigrateCommon args = { + .listen_uri = "defer", + .start_hook = test_migrate_precopy_tcp_multifd_start_zero_page_legacy, + /* + * Multifd is more complicated than most of the features, it + * directly takes guest page buffers when sending, make sure + * everything will work alright even if guest page is changing. + */ + .live = true, + }; + test_precopy_common(&args); +} + +static void test_multifd_tcp_no_zero_page(void) +{ + MigrateCommon args = { + .listen_uri = "defer", + .start_hook = test_migration_precopy_tcp_multifd_start_no_zero_page, + /* + * Multifd is more complicated than most of the features, it + * directly takes guest page buffers when sending, make sure + * everything will work alright even if guest page is changing. + */ + .live = true, + }; + test_precopy_common(&args); +} + static void test_multifd_tcp_zlib(void) { MigrateCommon args = { @@ -3729,6 +3777,10 @@ int main(int argc, char **argv) } migration_test_add("/migration/multifd/tcp/plain/none", test_multifd_tcp_none); + migration_test_add("/migration/multifd/tcp/plain/zero-page/legacy", + test_multifd_tcp_zero_page_legacy); + migration_test_add("/migration/multifd/tcp/plain/zero-page/none", + test_multifd_tcp_no_zero_page); migration_test_add("/migration/multifd/tcp/plain/cancel", test_multifd_tcp_cancel); migration_test_add("/migration/multifd/tcp/plain/zlib",