From patchwork Thu Aug 19 05:41:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Yang Shi X-Patchwork-Id: 12446259 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3ED6C432BE for ; Thu, 19 Aug 2021 05:41:22 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4BCA361029 for ; Thu, 19 Aug 2021 05:41:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 4BCA361029 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id B58C06B0071; Thu, 19 Aug 2021 01:41:21 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B08586B0072; Thu, 19 Aug 2021 01:41:21 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9F7838D0001; Thu, 19 Aug 2021 01:41:21 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 879816B0071 for ; Thu, 19 Aug 2021 01:41:21 -0400 (EDT) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 2771D182C1529 for ; Thu, 19 Aug 2021 05:41:21 +0000 (UTC) X-FDA: 78490732362.19.331E073 Received: from mail-pj1-f47.google.com (mail-pj1-f47.google.com [209.85.216.47]) by imf09.hostedemail.com (Postfix) with ESMTP id CCB803001370 for ; Thu, 19 Aug 2021 05:41:20 +0000 (UTC) Received: by mail-pj1-f47.google.com with SMTP id qe12-20020a17090b4f8c00b00179321cbae7so3998062pjb.2 for ; Wed, 18 Aug 2021 22:41:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Mt/4rfyXUyldm1Xcmb6KqkjTdGNzuNuF/ueCl6UGNMU=; b=ZVHh5O+hPomxwpmdk6odRPwuZX6S/4dwgZTwTDULMfxwNsRlY0Can4c/0wlu6Us4xR bUCXRNLlp1mqW7gROqrsp7Q48kPEMfYHqFniOef98yoarjjrf0sNZ6AZRmQhURMYfEmL rh72v4s2XFlM8zb0W6hTbVdH1P1xbdqY9O74l+3Uc0FEaHCR/VVW0+vozmysvPqnftWi ksKIiEBpnw/pk8cKulFstXMkYZTQtgapQI7XwcUq+t+81lM69pkn8VJpJTSMaeuKGboG tG6KM0kuqkFlz7tdXHl+SZ7pCxWbmnpFPbaDqAoM+ZV5pcVNG8iVTdK5G3yBwAv4OZL9 G08A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Mt/4rfyXUyldm1Xcmb6KqkjTdGNzuNuF/ueCl6UGNMU=; b=AElNwzynLlQA9/bfAUsL4nIiWKE/35p22CiR3HKyywMr/ARsdU+kx5Vn3MVf+MDFgL GSMJlDQgtXjRxdiYmbVL4fGyaWMlQsnFImVmuPJ9egDXREEpE3ukxoLGMWrAnSL19Q1U foQtdq98ymigrCWdlQ9r70oB2ae19qhNqOE5yoj/HTx50H8ODJK3vsCIhp4eGo0lsqbe udhlC1OEJ9TtuY/0qQfbBmVYjZEkr3rrfnfYtCF2Zm+mnG6wAIOcitw8D5KsJpmvAyyX Q7j9592SOt3UF1kOIcuzxVF4WZ6eu2Ggia5dI555MjxWyQBtTZojOMEZch981TtF5LSZ Kqog== X-Gm-Message-State: AOAM532eEjztH5I31uzJfUAssdL0dvoU5Pdgc/ggY3lDmzZlMzCOIaEg gv34m/xYPQNMhdMGdbdM7DQ= X-Google-Smtp-Source: ABdhPJwSyianaEpq/Gk+2fIaKTpUILzNhBnuQKUvRMTbt3LY0HIJ7XMozznH8wbh9L2CtHketxnURw== X-Received: by 2002:a17:90b:230d:: with SMTP id mt13mr12705805pjb.185.1629351679720; Wed, 18 Aug 2021 22:41:19 -0700 (PDT) Received: from localhost.localdomain (c-73-93-239-127.hsd1.ca.comcast.net. [73.93.239.127]) by smtp.gmail.com with ESMTPSA id s188sm1708312pfb.4.2021.08.18.22.41.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 22:41:18 -0700 (PDT) From: Yang Shi To: naoya.horiguchi@nec.com, osalvador@suse.de, tdmackey@twitter.com, david@redhat.com, willy@infradead.org, akpm@linux-foundation.org, corbet@lwn.net Cc: shy828301@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [v2 PATCH 1/3] mm: hwpoison: don't drop slab caches for offlining non-LRU page Date: Wed, 18 Aug 2021 22:41:14 -0700 Message-Id: <20210819054116.266126-1-shy828301@gmail.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=gmail.com header.s=20161025 header.b=ZVHh5O+h; spf=pass (imf09.hostedemail.com: domain of shy828301@gmail.com designates 209.85.216.47 as permitted sender) smtp.mailfrom=shy828301@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: CCB803001370 X-Stat-Signature: x35qzdqpaznnyuhk1s7qsnkzn1g4no14 X-HE-Tag: 1629351680-529085 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: In the current implementation of soft offline, if non-LRU page is met, all the slab caches will be dropped to free the page then offline. But if the page is not slab page all the effort is wasted in vain. Even though it is a slab page, it is not guaranteed the page could be freed at all. However the side effect and cost is quite high. It does not only drop the slab caches, but also may drop a significant amount of page caches which are associated with inode caches. It could make the most workingset gone in order to just offline a page. And the offline is not guaranteed to succeed at all, actually I really doubt the success rate for real life workload. Furthermore the worse consequence is the system may be locked up and unusable since the page cache release may incur huge amount of works queued for memcg release. Actually we ran into such unpleasant case in our production environment. Firstly, the workqueue of memory_failure_work_func is locked up as below: BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 53s! Showing busy workqueues and worker pools: workqueue events: flags=0x0   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=14/256 refcnt=15     in-flight: 409271:memory_failure_work_func     pending: kfree_rcu_work, kfree_rcu_monitor, kfree_rcu_work, rht_deferred_worker, rht_deferred_worker, rht_deferred_worker, rht_deferred_worker, kfree_rcu_work, kfree_rcu_work, kfree_rcu_work, kfree_rcu_work, drain_local_stock, kfree_rcu_work workqueue mm_percpu_wq: flags=0x8   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2     pending: vmstat_update workqueue cgroup_destroy: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 refcnt=12072 pending: css_release_work_fn There were over 12K css_release_work_fn queued, and this caused a few lockups due to the contention of worker pool lock with IRQ disabled, for example: NMI watchdog: Watchdog detected hard LOCKUP on cpu 1 Modules linked in: amd64_edac_mod edac_mce_amd crct10dif_pclmul crc32_pclmul ghash_clmulni_intel xt_DSCP iptable_mangle kvm_amd bpfilter vfat fat acpi_ipmi i2c_piix4 usb_storage ipmi_si k10temp i2c_core ipmi_devintf ipmi_msghandler acpi_cpufreq sch_fq_codel xfs libcrc32c crc32c_intel mlx5_core mlxfw nvme xhci_pci ptp nvme_core pps_core xhci_hcd CPU: 1 PID: 205500 Comm: kworker/1:0 Tainted: G L 5.10.32-t1.el7.twitter.x86_64 #1 Hardware name: TYAN F5AMT /z /S8026GM2NRE-CGN, BIOS V8.030 03/30/2021 Workqueue: events memory_failure_work_func RIP: 0010:queued_spin_lock_slowpath+0x41/0x1a0 Code: 41 f0 0f ba 2f 08 0f 92 c0 0f b6 c0 c1 e0 08 89 c2 8b 07 30 e4 09 d0 a9 00 01 ff ff 75 1b 85 c0 74 0e 8b 07 84 c0 74 08 f3 90 <8b> 07 84 c0 75 f8 b8 01 00 00 00 66 89 07 c3 f6 c4 01 75 04 c6 47 RSP: 0018:ffff9b2ac278f900 EFLAGS: 00000002 RAX: 0000000000480101 RBX: ffff8ce98ce71800 RCX: 0000000000000084 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8ce98ce6a140 RBP: 00000000000284c8 R08: ffffd7248dcb6808 R09: 0000000000000000 R10: 0000000000000003 R11: ffff9b2ac278f9b0 R12: 0000000000000001 R13: ffff8cb44dab9c00 R14: ffffffffbd1ce6a0 R15: ffff8cacaa37f068 FS: 0000000000000000(0000) GS:ffff8ce98ce40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcf6e8cb000 CR3: 0000000a0c60a000 CR4: 0000000000350ee0 Call Trace: __queue_work+0xd6/0x3c0 queue_work_on+0x1c/0x30 uncharge_batch+0x10e/0x110 mem_cgroup_uncharge_list+0x6d/0x80 release_pages+0x37f/0x3f0 __pagevec_release+0x1c/0x50 __invalidate_mapping_pages+0x348/0x380 ? xfs_alloc_buftarg+0xa4/0x120 [xfs] inode_lru_isolate+0x10a/0x160 ? iput+0x1d0/0x1d0 __list_lru_walk_one+0x7b/0x170 ? iput+0x1d0/0x1d0 list_lru_walk_one+0x4a/0x60 prune_icache_sb+0x37/0x50 super_cache_scan+0x123/0x1a0 do_shrink_slab+0x10c/0x2c0 shrink_slab+0x1f1/0x290 drop_slab_node+0x4d/0x70 soft_offline_page+0x1ac/0x5b0 ? dev_mce_log+0xee/0x110 ? notifier_call_chain+0x39/0x90 memory_failure_work_func+0x6a/0x90 process_one_work+0x19e/0x340 ? process_one_work+0x340/0x340 worker_thread+0x30/0x360 ? process_one_work+0x340/0x340 kthread+0x116/0x130 The lockup made the machine is quite unusable. And it also made the most workingset gone, the reclaimabled slab caches were reduced from 12G to 300MB, the page caches were decreased from 17G to 4G. But the most disappointing thing is all the effort doesn't make the page offline, it just returns: soft_offline: 0x1469f2: unknown non LRU page type 5ffff0000000000 () It seems the aggressive behavior for non-LRU page didn't pay back, so it doesn't make too much sense to keep it considering the terrible side effect. Reported-by: David Mackey Cc: Naoya Horiguchi Cc: Oscar Salvador Cc: David Hildenbrand Signed-off-by: Yang Shi Acked-by: Naoya Horiguchi Acked-by: David Hildenbrand --- v2: * Rebased on top of https://lore.kernel.org/linux-mm/CAHbLzkpAEZRTmnOnjVHYHGJ7ApjdC8eDh53DAnTHsG185QGOfQ@mail.gmail.com/T/#t (Naoya Horiguchi) * Added comment about possible future optimization when handling slab page (David Hildenbrand) * Added patch #3 to call dump_page (Matthew Wilcox) include/linux/mm.h | 2 +- mm/hwpoison-inject.c | 2 +- mm/memory-failure.c | 18 ++++++++---------- 3 files changed, 10 insertions(+), 12 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 7e43d1b01e0a..a3cc83d64564 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3203,7 +3203,7 @@ extern void memory_failure_queue_kick(int cpu); extern int unpoison_memory(unsigned long pfn); extern int sysctl_memory_failure_early_kill; extern int sysctl_memory_failure_recovery; -extern void shake_page(struct page *p, int access); +extern void shake_page(struct page *p); extern atomic_long_t num_poisoned_pages __read_mostly; extern int soft_offline_page(unsigned long pfn, int flags); diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c index 1ae1ebc2b9b1..aff4d27ec235 100644 --- a/mm/hwpoison-inject.c +++ b/mm/hwpoison-inject.c @@ -30,7 +30,7 @@ static int hwpoison_inject(void *data, u64 val) if (!hwpoison_filter_enable) goto inject; - shake_page(hpage, 0); + shake_page(hpage); /* * This implies unable to support non-LRU pages. */ diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 665316c7ea40..7cfa134b1370 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -282,9 +282,9 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags) /* * Unknown page type encountered. Try to check whether it can turn PageLRU by - * lru_add_drain_all, or a free page by reclaiming slabs when possible. + * lru_add_drain_all. */ -void shake_page(struct page *p, int access) +void shake_page(struct page *p) { if (PageHuge(p)) return; @@ -296,11 +296,9 @@ void shake_page(struct page *p, int access) } /* - * Only call drop_slab_node here (which would also shrink - * other caches) if access is not potentially fatal. + * TODO: Could shrink slab caches here if a lightweight range-based + * shrinker will be available. */ - if (access) - drop_slab_node(page_to_nid(p)); } EXPORT_SYMBOL_GPL(shake_page); @@ -1205,7 +1203,7 @@ static int get_any_page(struct page *p, unsigned long flags) * page, retry. */ if (pass++ < 3) { - shake_page(p, 1); + shake_page(p); goto try_again; } ret = -EIO; @@ -1222,7 +1220,7 @@ static int get_any_page(struct page *p, unsigned long flags) */ if (pass++ < 3) { put_page(p); - shake_page(p, 1); + shake_page(p); count_increased = false; goto try_again; } @@ -1369,7 +1367,7 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn, * shake_page() again to ensure that it's flushed. */ if (mlocked) - shake_page(hpage, 0); + shake_page(hpage); /* * Now that the dirty bit has been propagated to the @@ -1723,7 +1721,7 @@ int memory_failure(unsigned long pfn, int flags) * The check (unnecessarily) ignores LRU pages being isolated and * walked by the page reclaim code, however that's not a big loss. */ - shake_page(p, 0); + shake_page(p); lock_page(p); From patchwork Thu Aug 19 05:41:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Shi X-Patchwork-Id: 12446261 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 501ACC4320E for ; Thu, 19 Aug 2021 05:41:24 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F33796101A for ; Thu, 19 Aug 2021 05:41:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org F33796101A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 9365D6B0072; Thu, 19 Aug 2021 01:41:23 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8C0C86B0073; Thu, 19 Aug 2021 01:41:23 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 768718D0001; Thu, 19 Aug 2021 01:41:23 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0254.hostedemail.com [216.40.44.254]) by kanga.kvack.org (Postfix) with ESMTP id 5C7736B0072 for ; Thu, 19 Aug 2021 01:41:23 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 120F2182BF4FF for ; Thu, 19 Aug 2021 05:41:23 +0000 (UTC) X-FDA: 78490732446.20.49EFCE3 Received: from mail-pj1-f44.google.com (mail-pj1-f44.google.com [209.85.216.44]) by imf24.hostedemail.com (Postfix) with ESMTP id C5EB0B007B07 for ; Thu, 19 Aug 2021 05:41:22 +0000 (UTC) Received: by mail-pj1-f44.google.com with SMTP id j12-20020a17090aeb0c00b00179530520b3so10601242pjz.0 for ; Wed, 18 Aug 2021 22:41:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=BwNoXd2rkxIRbmu9Dz8FHaUqpffdyUvc7YXbY/NWg74=; b=PdcEETJ4lvxCKbU5HNkMObo/tzIR10Sio6tX8G5djfW7suz8OI3ehQMKsU/oDnVWNC ahGmK8RoZurLovVnDfMYTVT8j3662vj/VyB3FynnJ7tKg2qN1t8FsaJGFQcSbGeLfJUp IlUZZbJMevUtW45efSzodMEpTnaMBzNeJt128zo46Zctz0l5WDnZMJEluO+Opb9j60FY vSWUIhdJmN+ngPlNoXfaTOR4Bx9EQevY8lEUDUbTaY7t/POY/+ch4V4pxSF4LggJnBgw sfwL/nhjUL8BFhmI6cKeh8rlfm8GtJ/nWUojo8dNB4rNUC6EtOoG9r9ceKozu6pC3uL3 MU1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=BwNoXd2rkxIRbmu9Dz8FHaUqpffdyUvc7YXbY/NWg74=; b=U8NCsIeLCMS/3NnvyhhEuR0Fw9bzPP26ZT5OiAXxRhRozZqvAWiDBS3pLgtIANAzht NBEeG7+1aLw6qdNDR+Q/1ZIv2+k1WkOmjnesuOFkC0sqF0cfSoYYP8TvLygyyGqdy5nw lVqcw+se2fv0xXHH1qL8kmgIEvEZ8D1Oe6mDZ8/h1bcFZ80cehptOnXW3ov3sF3nB+oG AGRX4YrzFrzvPP9nEwXzH+cZ/EY+AMQG+LXBFh/we3+j4FDGPvGJYdQ+d2c22D+bXD5E j0PAGuyUgcqFr4+BbSKVfz/h+L8SvL1LJHWpRBlU3CR1uicZ/Csk9dI1nKfkGKnbqmWU Rg4A== X-Gm-Message-State: AOAM532o5tYXlOXpuGY1bKjBmlr4Guqovul1smRg6z86EesNeUNWzWjR 0AojjqVIt+aRSe1lOBU4M0A= X-Google-Smtp-Source: ABdhPJwlRDHwmoY4LYbWF0eLUcH7gjgRBpwhAERepvRAbRzqX2F2N6qQYu+EGeLp2nxNRgb8Fe3ETw== X-Received: by 2002:a17:90a:8d06:: with SMTP id c6mr13107839pjo.9.1629351681836; Wed, 18 Aug 2021 22:41:21 -0700 (PDT) Received: from localhost.localdomain (c-73-93-239-127.hsd1.ca.comcast.net. [73.93.239.127]) by smtp.gmail.com with ESMTPSA id s188sm1708312pfb.4.2021.08.18.22.41.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 22:41:20 -0700 (PDT) From: Yang Shi To: naoya.horiguchi@nec.com, osalvador@suse.de, tdmackey@twitter.com, david@redhat.com, willy@infradead.org, akpm@linux-foundation.org, corbet@lwn.net Cc: shy828301@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [v2 PATCH 2/3] doc: hwpoison: correct the support for hugepage Date: Wed, 18 Aug 2021 22:41:15 -0700 Message-Id: <20210819054116.266126-2-shy828301@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210819054116.266126-1-shy828301@gmail.com> References: <20210819054116.266126-1-shy828301@gmail.com> MIME-Version: 1.0 Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=gmail.com header.s=20161025 header.b=PdcEETJ4; spf=pass (imf24.hostedemail.com: domain of shy828301@gmail.com designates 209.85.216.44 as permitted sender) smtp.mailfrom=shy828301@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: C5EB0B007B07 X-Stat-Signature: m74acfihfjnbh5xzmyqfzh45qfpseq7t X-HE-Tag: 1629351682-474449 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The hwpoison support for huge page, both hugetlb and THP, has been in kernel for a while, the statement in document is obsolete, correct it. Acked-by: Naoya Horiguchi Cc: Oscar Salvador Signed-off-by: Yang Shi Reviewed-by: David Hildenbrand --- v2: * Collected ack from Naoya Horiguchi Documentation/vm/hwpoison.rst | 1 - 1 file changed, 1 deletion(-) diff --git a/Documentation/vm/hwpoison.rst b/Documentation/vm/hwpoison.rst index a5c884293dac..89b5f7a52077 100644 --- a/Documentation/vm/hwpoison.rst +++ b/Documentation/vm/hwpoison.rst @@ -180,7 +180,6 @@ Limitations =========== - Not all page types are supported and never will. Most kernel internal objects cannot be recovered, only LRU pages for now. -- Right now hugepage support is missing. --- Andi Kleen, Oct 2009 From patchwork Thu Aug 19 05:41:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Shi X-Patchwork-Id: 12446263 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5234EC4338F for ; Thu, 19 Aug 2021 05:41:26 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 03027608FE for ; Thu, 19 Aug 2021 05:41:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 03027608FE Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 9D1A06B0073; Thu, 19 Aug 2021 01:41:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 9833D6B0074; Thu, 19 Aug 2021 01:41:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7D55E8D0001; Thu, 19 Aug 2021 01:41:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0231.hostedemail.com [216.40.44.231]) by kanga.kvack.org (Postfix) with ESMTP id 641F76B0073 for ; Thu, 19 Aug 2021 01:41:25 -0400 (EDT) Received: from smtpin33.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 0B1C9181BCDDA for ; Thu, 19 Aug 2021 05:41:25 +0000 (UTC) X-FDA: 78490732530.33.65F5EF3 Received: from mail-pl1-f174.google.com (mail-pl1-f174.google.com [209.85.214.174]) by imf29.hostedemail.com (Postfix) with ESMTP id BE5C5901E59A for ; Thu, 19 Aug 2021 05:41:24 +0000 (UTC) Received: by mail-pl1-f174.google.com with SMTP id w6so3240324plg.9 for ; Wed, 18 Aug 2021 22:41:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=X40twNuUzE3XmXzdn7oC63jTsAYe8TLwgZJqPK62/Bw=; b=PpGbgxwRwy9qvrBfzI5BPxYXv+Me68BOJn/inChLaH5pJiGm3ZH3LTsTqN7I5qMCjb U1sQl8iUXqJsenXuolEo0eLTYm0xosg3mxOQNDMgo7zh+2h2ajeS84kNDMta/3jM64J7 Ba3NwwTlOG5N1OlKGzNN1UM8Wc2CGNqhb/B9v0S7NHv8qHMxADsGxFBPAN29Yehdxb6i Uhdbcu0wUPmzzj10NPK25q9KKs7diD0jDoVFKjNsumplzyiqmXkxhF8Z/9DnDv56FiKc ckKbBvW+yZjP9qp0iaDEQH/p5p11czoQx72KR0U9NQr31iy5X5tbeunFATtQDlKZNPuT iXZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=X40twNuUzE3XmXzdn7oC63jTsAYe8TLwgZJqPK62/Bw=; b=rTfpopt8zao2QMDWZHsHVPIaogQnJDklb0Une1B4kmpqjlky+/CPgSiAEGyCWx8+Gg WEqF5WYHzshz+6z7UvpVQN1hZwFzpid7SfCMM1eS0sj1dDRcoKwZ+KEqzfMLjciGH5KG /lytQtFT3oB41BaYBA0mvqJATxbBq3/saJQloNQmwvodZUPSgC+i7MfAEC/1GvTsrd8S D7oeY9vlQgCk3oA2Kipz2bd33gLYnx7zpHHS/009+A1JLFYFKZPJPV9lfb1VEYdHBgnz VFmehzf/qTLRePaE07m9lTI04wFkxsS+0Le+umfD1K5LdzC5AqHCA5xbzkOo+uQyMmf5 7dZw== X-Gm-Message-State: AOAM530ZmvWS/0IQcfj56bQn7r+7Q5gn7q8DJBl4qImWmOcWMWpywXSs uT5zl1I42o/Y36v33eT4Mmd7xiKf2btSuQ== X-Google-Smtp-Source: ABdhPJzSc2ESnEMB8pnICcxfybX3I1DbquopD7QOl27N2POjjalvV22HoQM/H18rVmTmceMyCTSf8A== X-Received: by 2002:a17:902:8f8b:b029:12c:d085:7918 with SMTP id z11-20020a1709028f8bb029012cd0857918mr10423716plo.10.1629351683886; Wed, 18 Aug 2021 22:41:23 -0700 (PDT) Received: from localhost.localdomain (c-73-93-239-127.hsd1.ca.comcast.net. [73.93.239.127]) by smtp.gmail.com with ESMTPSA id s188sm1708312pfb.4.2021.08.18.22.41.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 22:41:22 -0700 (PDT) From: Yang Shi To: naoya.horiguchi@nec.com, osalvador@suse.de, tdmackey@twitter.com, david@redhat.com, willy@infradead.org, akpm@linux-foundation.org, corbet@lwn.net Cc: shy828301@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [v2 PATCH 3/3] mm: hwpoison: dump page for unhandlable page Date: Wed, 18 Aug 2021 22:41:16 -0700 Message-Id: <20210819054116.266126-3-shy828301@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210819054116.266126-1-shy828301@gmail.com> References: <20210819054116.266126-1-shy828301@gmail.com> MIME-Version: 1.0 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: BE5C5901E59A X-Stat-Signature: ftuuunknnjc8cs6mjs17djggdsym1os4 Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=gmail.com header.s=20161025 header.b=PpGbgxwR; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf29.hostedemail.com: domain of shy828301@gmail.com designates 209.85.214.174 as permitted sender) smtp.mailfrom=shy828301@gmail.com X-HE-Tag: 1629351684-249089 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Currently just very simple message is shown for unhandlable page, e.g. non-LRU page, like: soft_offline: 0x1469f2: unknown non LRU page type 5ffff0000000000 () It is not very helpful for further debug, calling dump_page() could show more useful information. Calling dump_page() in get_any_page() in order to not duplicate the call in a couple of different places. It may be called with pcp disabled and holding memory hotplug lock, it should be not a big deal since hwpoison handler is not called very often. Suggested-by: Matthew Wilcox Cc: Naoya Horiguchi Cc: Oscar Salvador Signed-off-by: Yang Shi --- mm/memory-failure.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 7cfa134b1370..60df8fcd0444 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1228,6 +1228,9 @@ static int get_any_page(struct page *p, unsigned long flags) ret = -EIO; } out: + if (ret == -EIO) + dump_page(p, "hwpoison: unhandlable page"); + return ret; }