From patchwork Fri Feb 25 13:07:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 12760213 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C4A78C433F5 for ; Fri, 25 Feb 2022 13:07:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240918AbiBYNIV (ORCPT ); Fri, 25 Feb 2022 08:08:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46472 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240858AbiBYNIQ (ORCPT ); Fri, 25 Feb 2022 08:08:16 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D27B022B955; Fri, 25 Feb 2022 05:07:42 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 6C7F661C9C; Fri, 25 Feb 2022 13:07:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F08E9C340F3; Fri, 25 Feb 2022 13:07:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645794461; bh=gy7a+rbxsqAtXGvFj8lJRy3faq2q3d+XiqclILKcfZk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FzEzddETDxJm6mzhIi629CoOT8kyjb0QYQq3VabGEJKmcisCm/4A9YqDZkofUzmVH fTAIJMItWq5IoS3hDhNAVLpE9puG9LPZTk8o4ddrjO1+kYXz8dEsSXrvjNqFwxJYd/ yGTI/oS5Iq624GcwSwZy+rMBiodpOCc46YyurndjnhVsFnWNlF6UOh2RRRK+RuAFvW y+FPm2MZJoStgIYr+4NOwAbUC5ByWaMln5d/Wmuh3n6rme/D+eaxpWaU0m5iXFLylQ ZwpFOB6Unml6NTxVkPt7H7sqD7zoc0KBkTococ4y/Gok9FaYG91XyHRHDXP8B1Y5FN 50iw/nKwJPvQg== From: SeongJae Park To: akpm@linux-foundation.org Cc: corbet@lwn.net, skhan@linuxfoundation.org, rientjes@google.com, xhao@linux.alibaba.com, linux-damon@amazon.com, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, SeongJae Park Subject: [PATCH v2 05/13] mm/damon/sysfs: Support the physical address space monitoring Date: Fri, 25 Feb 2022 13:07:04 +0000 Message-Id: <20220225130712.12682-6-sj@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220225130712.12682-1-sj@kernel.org> References: <20220225130712.12682-1-sj@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org This commit makes DAMON sysfs interface supports the physical address space monitoring. Specifically, this commit adds support of the initial monitoring regions set feature by adding 'regions' directory under each target directory and makes context operations file to receive 'paddr' in addition to 'vaddr'. As a result, the files hierarchy becomes as below: /sys/kernel/mm/damon/admin │ kdamonds/nr_kdamonds │ │ 0/state,pid │ │ │ contexts/nr_contexts │ │ │ │ 0/operations │ │ │ │ │ monitoring_attrs/ │ │ │ │ │ │ intervals/sample_us,aggr_us,update_us │ │ │ │ │ │ nr_regions/min,max │ │ │ │ │ targets/nr_targets │ │ │ │ │ │ 0/pid_target │ │ │ │ │ │ │ regions/nr_regions <- NEW DIRECTORY │ │ │ │ │ │ │ │ 0/start,end │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ ... │ │ │ │ ... │ │ ... Signed-off-by: SeongJae Park --- mm/damon/sysfs.c | 276 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 271 insertions(+), 5 deletions(-) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 9221c93db6cc..968a4ba8e81b 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -113,12 +113,220 @@ static struct kobj_type damon_sysfs_ul_range_ktype = { .default_groups = damon_sysfs_ul_range_groups, }; +/* + * init region directory + */ + +struct damon_sysfs_region { + struct kobject kobj; + unsigned long start; + unsigned long end; +}; + +static struct damon_sysfs_region *damon_sysfs_region_alloc( + unsigned long start, + unsigned long end) +{ + struct damon_sysfs_region *region = kmalloc(sizeof(*region), + GFP_KERNEL); + + if (!region) + return NULL; + region->kobj = (struct kobject){}; + region->start = start; + region->end = end; + return region; +} + +static ssize_t start_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + struct damon_sysfs_region *region = container_of(kobj, + struct damon_sysfs_region, kobj); + + return sysfs_emit(buf, "%lu\n", region->start); +} + +static ssize_t start_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t count) +{ + struct damon_sysfs_region *region = container_of(kobj, + struct damon_sysfs_region, kobj); + int err = kstrtoul(buf, 0, ®ion->start); + + if (err) + return -EINVAL; + return count; +} + +static ssize_t end_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + struct damon_sysfs_region *region = container_of(kobj, + struct damon_sysfs_region, kobj); + + return sysfs_emit(buf, "%lu\n", region->end); +} + +static ssize_t end_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t count) +{ + struct damon_sysfs_region *region = container_of(kobj, + struct damon_sysfs_region, kobj); + int err = kstrtoul(buf, 0, ®ion->end); + + if (err) + return -EINVAL; + return count; +} + +static void damon_sysfs_region_release(struct kobject *kobj) +{ + kfree(container_of(kobj, struct damon_sysfs_region, kobj)); +} + +static struct kobj_attribute damon_sysfs_region_start_attr = + __ATTR_RW_MODE(start, 0600); + +static struct kobj_attribute damon_sysfs_region_end_attr = + __ATTR_RW_MODE(end, 0600); + +static struct attribute *damon_sysfs_region_attrs[] = { + &damon_sysfs_region_start_attr.attr, + &damon_sysfs_region_end_attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(damon_sysfs_region); + +static struct kobj_type damon_sysfs_region_ktype = { + .release = damon_sysfs_region_release, + .sysfs_ops = &kobj_sysfs_ops, + .default_groups = damon_sysfs_region_groups, +}; + +/* + * init_regions directory + */ + +struct damon_sysfs_regions { + struct kobject kobj; + struct damon_sysfs_region **regions_arr; + int nr; +}; + +static struct damon_sysfs_regions *damon_sysfs_regions_alloc(void) +{ + return kzalloc(sizeof(struct damon_sysfs_regions), GFP_KERNEL); +} + +static void damon_sysfs_regions_rm_dirs(struct damon_sysfs_regions *regions) +{ + struct damon_sysfs_region **regions_arr = regions->regions_arr; + int i; + + for (i = 0; i < regions->nr; i++) + kobject_put(®ions_arr[i]->kobj); + regions->nr = 0; + kfree(regions_arr); + regions->regions_arr = NULL; +} + +static int damon_sysfs_regions_add_dirs(struct damon_sysfs_regions *regions, + int nr_regions) +{ + struct damon_sysfs_region **regions_arr, *region; + int err, i; + + damon_sysfs_regions_rm_dirs(regions); + if (!nr_regions) + return 0; + + regions_arr = kmalloc_array(nr_regions, sizeof(*regions_arr), + GFP_KERNEL | __GFP_NOWARN); + if (!regions_arr) + return -ENOMEM; + regions->regions_arr = regions_arr; + + for (i = 0; i < nr_regions; i++) { + region = damon_sysfs_region_alloc(0, 0); + if (!region) { + damon_sysfs_regions_rm_dirs(regions); + return -ENOMEM; + } + + err = kobject_init_and_add(®ion->kobj, + &damon_sysfs_region_ktype, ®ions->kobj, + "%d", i); + if (err) { + kobject_put(®ion->kobj); + damon_sysfs_regions_rm_dirs(regions); + return err; + } + + regions_arr[i] = region; + regions->nr++; + } + return 0; +} + +static ssize_t nr_regions_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_regions *regions = container_of(kobj, + struct damon_sysfs_regions, kobj); + + return sysfs_emit(buf, "%d\n", regions->nr); +} + +static ssize_t nr_regions_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_regions *regions = container_of(kobj, + struct damon_sysfs_regions, kobj); + int nr, err = kstrtoint(buf, 0, &nr); + + if (err) + return err; + if (nr < 0) + return -EINVAL; + + if (!mutex_trylock(&damon_sysfs_lock)) + return -EBUSY; + err = damon_sysfs_regions_add_dirs(regions, nr); + mutex_unlock(&damon_sysfs_lock); + if (err) + return err; + + return count; +} + +static void damon_sysfs_regions_release(struct kobject *kobj) +{ + kfree(container_of(kobj, struct damon_sysfs_regions, kobj)); +} + +static struct kobj_attribute damon_sysfs_regions_nr_attr = + __ATTR_RW_MODE(nr_regions, 0600); + +static struct attribute *damon_sysfs_regions_attrs[] = { + &damon_sysfs_regions_nr_attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(damon_sysfs_regions); + +static struct kobj_type damon_sysfs_regions_ktype = { + .release = damon_sysfs_regions_release, + .sysfs_ops = &kobj_sysfs_ops, + .default_groups = damon_sysfs_regions_groups, +}; + /* * target directory */ struct damon_sysfs_target { struct kobject kobj; + struct damon_sysfs_regions *regions; int pid; }; @@ -127,6 +335,29 @@ static struct damon_sysfs_target *damon_sysfs_target_alloc(void) return kzalloc(sizeof(struct damon_sysfs_target), GFP_KERNEL); } +static int damon_sysfs_target_add_dirs(struct damon_sysfs_target *target) +{ + struct damon_sysfs_regions *regions = damon_sysfs_regions_alloc(); + int err; + + if (!regions) + return -ENOMEM; + + err = kobject_init_and_add(®ions->kobj, &damon_sysfs_regions_ktype, + &target->kobj, "regions"); + if (err) + kobject_put(®ions->kobj); + else + target->regions = regions; + return err; +} + +static void damon_sysfs_target_rm_dirs(struct damon_sysfs_target *target) +{ + damon_sysfs_regions_rm_dirs(target->regions); + kobject_put(&target->regions->kobj); +} + static ssize_t pid_target_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { @@ -188,8 +419,10 @@ static void damon_sysfs_targets_rm_dirs(struct damon_sysfs_targets *targets) struct damon_sysfs_target **targets_arr = targets->targets_arr; int i; - for (i = 0; i < targets->nr; i++) + for (i = 0; i < targets->nr; i++) { + damon_sysfs_target_rm_dirs(targets_arr[i]); kobject_put(&targets_arr[i]->kobj); + } targets->nr = 0; kfree(targets_arr); targets->targets_arr = NULL; @@ -224,6 +457,10 @@ static int damon_sysfs_targets_add_dirs(struct damon_sysfs_targets *targets, if (err) goto out; + err = damon_sysfs_target_add_dirs(target); + if (err) + goto out; + targets_arr[i] = target; targets->nr++; } @@ -608,9 +845,6 @@ static ssize_t operations_store(struct kobject *kobj, for (id = 0; id < NR_DAMON_OPS; id++) { if (sysfs_streq(buf, damon_sysfs_ops_strs[id])) { - /* Support only vaddr */ - if (id != DAMON_OPS_VADDR) - return -EINVAL; context->ops_id = id; return count; } @@ -855,10 +1089,37 @@ static void damon_sysfs_destroy_targets(struct damon_ctx *ctx) } } +static int damon_sysfs_set_regions(struct damon_target *t, + struct damon_sysfs_regions *sysfs_regions) +{ + int i; + + for (i = 0; i < sysfs_regions->nr; i++) { + struct damon_sysfs_region *sys_region = + sysfs_regions->regions_arr[i]; + struct damon_region *prev, *r; + + if (sys_region->start > sys_region->end) + return -EINVAL; + r = damon_new_region(sys_region->start, sys_region->end); + if (!r) + return -ENOMEM; + damon_add_region(r, t); + if (damon_nr_regions(t) > 1) { + prev = damon_prev_region(r); + if (prev->ar.end > r->ar.start) { + damon_destroy_region(r, t); + return -EINVAL; + } + } + } + return 0; +} + static int damon_sysfs_set_targets(struct damon_ctx *ctx, struct damon_sysfs_targets *sysfs_targets) { - int i; + int i, err; for (i = 0; i < sysfs_targets->nr; i++) { struct damon_sysfs_target *sys_target = @@ -877,6 +1138,11 @@ static int damon_sysfs_set_targets(struct damon_ctx *ctx, } } damon_add_target(ctx, t); + err = damon_sysfs_set_regions(t, sys_target->regions); + if (err) { + damon_sysfs_destroy_targets(ctx); + return err; + } } return 0; }