From nobody Fri Feb 13 03:07:32 2026 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 39E4013DDBA for ; Tue, 4 Jun 2024 02:06:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717466779; cv=none; b=BYr5FKGXqKcWq1DbvH/zrCasBahfP5sgExbNI6Wl/B0r6QU+sr2J4iYz2jboAGUlgTuoLBeiw2vUuc+v6IV3zXGaiKoxM8WNbHQkaHnXiuIIWZt2l7MHD9jQAogUqlbTssKDUbj/QGNTmh5qu+eNIgOnL07nnkD5t7/sjp8QE14= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717466779; c=relaxed/simple; bh=WzqkPugbOiVbWg+Bz3/39mPsvZeHjQJkUc7aNbm+ez4=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=QMxMf3sAc+ERjQdXnbNI9TF/TqESYtRqNjUUDIcjXNeqcpARKTZ2jPNrzgDrzpHJ3oYUW4h93b4gW9CVNIYwjSLGwXQTeVkWKxdJcuE1F3BqTD3v5DHyT5CAwKQ1P6JvMG6rczKnW9Q8Bc0cB6x5jcaNvE1iIWVPNTQDINYG+AI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--yuanchu.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=frO1Vxxv; arc=none smtp.client-ip=209.85.128.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--yuanchu.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="frO1Vxxv" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-627f20cff42so83743087b3.0 for ; Mon, 03 Jun 2024 19:06:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1717466776; x=1718071576; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=dRO4mHrw3JGh6nKhs6HXawOt4KQi22Ngkfo+vgcJs3s=; b=frO1VxxvzOztPw+gmxtFxjLugPMt7kPdrfiC5gbHQEKhke8UM0waezUQ8uiIxbZIvQ A2sR5dzsJ/eRqFThahsNDdm2cCH7YEheOsgdFhaaylfm+7sYTy02pwlVXCEmvEa4vg9V 4k/AVLRzgUzFG+Pp6wUNOMjLg09unZ7JSZhv2xVEF8oMucfgda5Qh8SC3Dwpe73RgUHy Zh7pjh7lQ9JsxpjS+w/2uqE+t7Z3Sy6dseD678ijc8yo3YmQQGZcnChtY+M2R9nfndeV n7v8QqRLpYPrs9CnzIM0UPL0qvixINQ2E2v8EUWcxdqFwXff7RoYTIVRkk0RNiSzTAQ6 dOUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717466776; x=1718071576; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=dRO4mHrw3JGh6nKhs6HXawOt4KQi22Ngkfo+vgcJs3s=; b=sIqOPKp9UC8qR23tF0oXcPevZWeBI0YpyhWcyHAgWPd6sLSG2JRE+EYokIjhMX+Vhz 9yFp/dhgkcIVpWxXTM71Ujmte/N2EHSuVGAOZZTcYe+baJko1MX9CAsLew3J44f04YaD XGq0i9u4wGFpiHv/H/R5BloGrmog8liA8x6Uti5vrFhPHuZHDoasgYIjMEcLtJf17bVD Pe/SygJ9T/pRGXOawiwfWeN4dAn831hGUWR3IlXQagJhsLc4O40ItcbyLq9ZCze3YR7h BgvAJebQdx/RWAOTSK+KCKUTzn48Cd6yKWSMpPBre4o5y59aERqoqNJCROW6mTECQtSH noVQ== X-Forwarded-Encrypted: i=1; AJvYcCVpMO5a+27ym2uMHQh2PGKVyRD4GaFGJkdqVdT4Ko9AoRXDD/8+nujg/pE2FglwrHIGDOIjeivEEvdUfsOzy2oyWfCJqiKkHG8DMAba X-Gm-Message-State: AOJu0YzbSeCAaag2pztyGnIvbHgOdiLxUfgvCY/3un+zbd6/XLTsI27w KJkxP1RBYfucPNgAtlJGOVmxqHVGtiAy89Z/zG+F58HKen5u6JfUBfc9xgfzvvz+jvEPJyXIQSJ Plnm7WQ== X-Google-Smtp-Source: AGHT+IEA7IxV4E1j3KloZIYFfUw/fULB2Z+7pThTKaRON0/8bQkhXcDdKIm+z8+ZQ9n1pMUXwDRfYO5MgVc/ X-Received: from yuanchu-desktop.svl.corp.google.com ([2620:15c:2a3:200:367f:7387:3dd2:73f1]) (user=yuanchu job=sendgmr) by 2002:a05:690c:fd5:b0:61c:89a4:dd5f with SMTP id 00721157ae682-62c794a2504mr34231327b3.0.1717466776247; Mon, 03 Jun 2024 19:06:16 -0700 (PDT) Date: Mon, 3 Jun 2024 19:05:46 -0700 In-Reply-To: <20240604020549.1017540-1-yuanchu@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240604020549.1017540-1-yuanchu@google.com> X-Mailer: git-send-email 2.45.1.467.gbab1589fc0-goog Message-ID: <20240604020549.1017540-6-yuanchu@google.com> Subject: [PATCH v2 5/8] mm: extend working set reporting to memcgs From: Yuanchu Xie To: David Hildenbrand , "Aneesh Kumar K.V" , Khalid Aziz , Henry Huang , Yu Zhao , Dan Williams , Gregory Price , Huang Ying , Muhammad Usama Anjum Cc: Kalesh Singh , Wei Xu , David Rientjes , Greg Kroah-Hartman , "Rafael J. Wysocki" , Andrew Morton , Johannes Weiner , Michal Hocko , Roman Gushchin , Muchun Song , Shuah Khan , Yosry Ahmed , Matthew Wilcox , Sudarshan Rajagopalan , Kairui Song , "Michael S. Tsirkin" , Vasily Averin , Nhat Pham , Miaohe Lin , Qi Zheng , Abel Wu , "Vishal Moola (Oracle)" , Kefeng Wang , Yuanchu Xie , linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Break down the system-wide working set reporting into per-memcg reports, which aggregages its children hierarchically. The per-node working set reporting histograms and refresh/report threshold files are presented as memcg files, showing a report containing all the nodes. The per-node page age interval is configurable in sysfs and not available per-memcg, while the refresh interval and report threshold are configured per-memcg. Memcg interface: /sys/fs/cgroup/.../memory.workingset.page_age The memcg equivalent of the sysfs workingset page age histogram, breaks down the workingset of this memcg and its children into page age intervals. Each node is prefixed with a node header and a newline. Non-proactive direct reclaim on this memcg can also wake up userspace agents that are waiting on this file. e.g. N0 1000 anon=3D0 file=3D0 2000 anon=3D0 file=3D0 3000 anon=3D0 file=3D0 4000 anon=3D0 file=3D0 5000 anon=3D0 file=3D0 18446744073709551615 anon=3D0 file=3D0 /sys/fs/cgroup/.../memory.workingset.refresh_interval The memcg equivalent of the sysfs refresh interval. A per-node number of how much time a page age histogram is valid for, in milliseconds. e.g. echo N0=3D2000 > memory.workingset.refresh_interval /sys/fs/cgroup/.../memory.workingset.report_threshold The memcg equivalent of the sysfs report threshold. A per-node number of how often userspace agent waiting on the page age histogram can be woken up, in milliseconds. e.g. echo N0=3D1000 > memory.workingset.report_threshold Signed-off-by: Yuanchu Xie --- include/linux/memcontrol.h | 5 + include/linux/workingset_report.h | 6 +- mm/internal.h | 2 + mm/memcontrol.c | 178 +++++++++++++++++++++++++++++- mm/workingset_report.c | 12 +- 5 files changed, 198 insertions(+), 5 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 030d34e9d117..91b08123950b 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -319,6 +319,11 @@ struct mem_cgroup { struct lru_gen_mm_list mm_list; #endif =20 +#ifdef CONFIG_WORKINGSET_REPORT + /* memory.workingset.page_age file */ + struct cgroup_file workingset_page_age_file; +#endif + struct mem_cgroup_per_node *nodeinfo[]; }; =20 diff --git a/include/linux/workingset_report.h b/include/linux/workingset_r= eport.h index 2ec8b927b200..ae412d408037 100644 --- a/include/linux/workingset_report.h +++ b/include/linux/workingset_report.h @@ -9,6 +9,7 @@ struct mem_cgroup; struct pglist_data; struct node; struct lruvec; +struct cgroup_file; =20 #ifdef CONFIG_WORKINGSET_REPORT =20 @@ -40,7 +41,10 @@ struct wsr_state { unsigned long report_threshold; unsigned long refresh_interval; =20 - struct kernfs_node *page_age_sys_file; + union { + struct kernfs_node *page_age_sys_file; + struct cgroup_file *page_age_cgroup_file; + }; =20 /* breakdown of workingset by page age */ struct mutex page_age_lock; diff --git a/mm/internal.h b/mm/internal.h index 3246384317f6..cf523a7c2048 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -404,6 +404,8 @@ void set_task_reclaim_state(struct task_struct *task, s= truct reclaim_state *rs); * in mm/wsr.c */ void notify_workingset(struct mem_cgroup *memcg, struct pglist_data *pgdat= ); +int workingset_report_intervals_parse(char *src, + struct wsr_report_bins *bins); #else static inline void notify_workingset(struct mem_cgroup *memcg, struct pglist_data *pgdat) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index f973679e4a24..48cdc9422794 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -7226,6 +7226,162 @@ static ssize_t memory_reclaim(struct kernfs_open_fi= le *of, char *buf, return nbytes; } =20 +#ifdef CONFIG_WORKINGSET_REPORT +static int memory_ws_refresh_interval_show(struct seq_file *m, void *v) +{ + int nid; + struct mem_cgroup *memcg =3D mem_cgroup_from_seq(m); + + for_each_node_state(nid, N_MEMORY) { + struct wsr_state *wsr =3D + &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr; + + seq_printf(m, "N%d=3D%u ", nid, + jiffies_to_msecs(READ_ONCE(wsr->refresh_interval))); + } + seq_putc(m, '\n'); + + return 0; +} + +static ssize_t memory_wsr_threshold_parse(char *buf, size_t nbytes, + unsigned int *nid_out, + unsigned int *msecs) +{ + char *node, *threshold; + unsigned int nid; + int err; + + buf =3D strstrip(buf); + threshold =3D buf; + node =3D strsep(&threshold, "=3D"); + + if (*node !=3D 'N') + return -EINVAL; + + err =3D kstrtouint(node + 1, 0, &nid); + if (err) + return err; + + if (nid >=3D nr_node_ids || !node_state(nid, N_MEMORY)) + return -EINVAL; + + err =3D kstrtouint(threshold, 0, msecs); + if (err) + return err; + + *nid_out =3D nid; + + return nbytes; +} + +static ssize_t memory_ws_refresh_interval_write(struct kernfs_open_file *o= f, + char *buf, size_t nbytes, + loff_t off) +{ + unsigned int nid, msecs; + struct wsr_state *wsr; + struct mem_cgroup *memcg =3D mem_cgroup_from_css(of_css(of)); + ssize_t ret =3D memory_wsr_threshold_parse(buf, nbytes, &nid, &msecs); + + if (ret < 0) + return ret; + + wsr =3D &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr; + + mutex_lock(&wsr->page_age_lock); + if (msecs && !wsr->page_age) { + struct wsr_page_age_histo *page_age =3D + kzalloc(sizeof(struct wsr_page_age_histo), GFP_KERNEL); + + if (!page_age) { + ret =3D -ENOMEM; + goto unlock; + } + wsr->page_age =3D page_age; + } + if (!msecs && wsr->page_age) { + kfree(wsr->page_age); + wsr->page_age =3D NULL; + } + + WRITE_ONCE(wsr->refresh_interval, msecs_to_jiffies(msecs)); +unlock: + mutex_unlock(&wsr->page_age_lock); + return ret; +} + +static int memory_ws_report_threshold_show(struct seq_file *m, void *v) +{ + int nid; + struct mem_cgroup *memcg =3D mem_cgroup_from_seq(m); + + for_each_node_state(nid, N_MEMORY) { + struct wsr_state *wsr =3D + &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr; + + seq_printf(m, "N%d=3D%u ", nid, + jiffies_to_msecs(READ_ONCE(wsr->report_threshold))); + } + seq_putc(m, '\n'); + + return 0; +} + +static ssize_t memory_ws_report_threshold_write(struct kernfs_open_file *o= f, + char *buf, size_t nbytes, + loff_t off) +{ + unsigned int nid, msecs; + struct wsr_state *wsr; + struct mem_cgroup *memcg =3D mem_cgroup_from_css(of_css(of)); + ssize_t ret =3D memory_wsr_threshold_parse(buf, nbytes, &nid, &msecs); + + if (ret < 0) + return ret; + + wsr =3D &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr; + WRITE_ONCE(wsr->report_threshold, msecs_to_jiffies(msecs)); + return ret; +} + +static int memory_ws_page_age_show(struct seq_file *m, void *v) +{ + int nid; + struct mem_cgroup *memcg =3D mem_cgroup_from_seq(m); + + for_each_node_state(nid, N_MEMORY) { + struct wsr_state *wsr =3D + &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr; + struct wsr_report_bin *bin; + + if (!READ_ONCE(wsr->page_age)) + continue; + + wsr_refresh_report(wsr, memcg, NODE_DATA(nid)); + mutex_lock(&wsr->page_age_lock); + if (!wsr->page_age) + goto unlock; + seq_printf(m, "N%d\n", nid); + for (bin =3D wsr->page_age->bins; + bin->idle_age !=3D WORKINGSET_INTERVAL_MAX; bin++) + seq_printf(m, "%u anon=3D%lu file=3D%lu\n", + jiffies_to_msecs(bin->idle_age), + bin->nr_pages[0] * PAGE_SIZE, + bin->nr_pages[1] * PAGE_SIZE); + + seq_printf(m, "%lu anon=3D%lu file=3D%lu\n", WORKINGSET_INTERVAL_MAX, + bin->nr_pages[0] * PAGE_SIZE, + bin->nr_pages[1] * PAGE_SIZE); + +unlock: + mutex_unlock(&wsr->page_age_lock); + } + + return 0; +} +#endif + static struct cftype memory_files[] =3D { { .name =3D "current", @@ -7294,7 +7450,27 @@ static struct cftype memory_files[] =3D { .flags =3D CFTYPE_NS_DELEGATABLE, .write =3D memory_reclaim, }, - { } /* terminate */ +#ifdef CONFIG_WORKINGSET_REPORT + { + .name =3D "workingset.refresh_interval", + .flags =3D CFTYPE_NOT_ON_ROOT | CFTYPE_NS_DELEGATABLE, + .seq_show =3D memory_ws_refresh_interval_show, + .write =3D memory_ws_refresh_interval_write, + }, + { + .name =3D "workingset.report_threshold", + .flags =3D CFTYPE_NOT_ON_ROOT | CFTYPE_NS_DELEGATABLE, + .seq_show =3D memory_ws_report_threshold_show, + .write =3D memory_ws_report_threshold_write, + }, + { + .name =3D "workingset.page_age", + .flags =3D CFTYPE_NOT_ON_ROOT | CFTYPE_NS_DELEGATABLE, + .file_offset =3D offsetof(struct mem_cgroup, workingset_page_age_file), + .seq_show =3D memory_ws_page_age_show, + }, +#endif + {} /* terminate */ }; =20 struct cgroup_subsys memory_cgrp_subsys =3D { diff --git a/mm/workingset_report.c b/mm/workingset_report.c index 801ac8e5c1da..72f2cad85a0d 100644 --- a/mm/workingset_report.c +++ b/mm/workingset_report.c @@ -37,9 +37,12 @@ void wsr_destroy_pgdat(struct pglist_data *pgdat) void wsr_init_lruvec(struct lruvec *lruvec) { struct wsr_state *wsr =3D &lruvec->wsr; + struct mem_cgroup *memcg =3D lruvec_memcg(lruvec); =20 memset(wsr, 0, sizeof(*wsr)); mutex_init(&wsr->page_age_lock); + if (memcg && !mem_cgroup_is_root(memcg)) + wsr->page_age_cgroup_file =3D &memcg->workingset_page_age_file; } =20 void wsr_destroy_lruvec(struct lruvec *lruvec) @@ -51,8 +54,8 @@ void wsr_destroy_lruvec(struct lruvec *lruvec) memset(wsr, 0, sizeof(*wsr)); } =20 -static int workingset_report_intervals_parse(char *src, - struct wsr_report_bins *bins) +int workingset_report_intervals_parse(char *src, + struct wsr_report_bins *bins) { int err =3D 0, i =3D 0; char *cur, *next =3D strim(src); @@ -542,5 +545,8 @@ void notify_workingset(struct mem_cgroup *memcg, struct= pglist_data *pgdat) { struct wsr_state *wsr =3D &mem_cgroup_lruvec(memcg, pgdat)->wsr; =20 - kernfs_notify(wsr->page_age_sys_file); + if (mem_cgroup_is_root(memcg)) + kernfs_notify(wsr->page_age_sys_file); + else + cgroup_file_notify(wsr->page_age_cgroup_file); } --=20 2.45.1.467.gbab1589fc0-goog