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Tue, 22 Apr 2025 04:21:54 -0700 (PDT) Received: from localhost.localdomain ([193.203.214.57]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b0db145a6e5sm7117508a12.57.2025.04.22.04.21.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Apr 2025 04:21:54 -0700 (PDT) From: xu xin X-Google-Original-From: xu xin To: xu.xin16@zte.com.cn Cc: akpm@linux-foundation.org, david@redhat.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, wang.yaxin@zte.com.cn, yang.yang29@zte.com.cn Subject: [PATCH RESEND 4/6] memcontrol-v1: add ksm_zero_pages in cgroup/memory.ksm_stat Date: Tue, 22 Apr 2025 11:21:49 +0000 Message-Id: <20250422112149.3231488-1-xu.xin16@zte.com.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250422191407770210-193JBD0Fgeu5zqE2K@zte.com.cn> References: <20250422191407770210-193JBD0Fgeu5zqE2K@zte.com.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: rt6k43bijitobygq1g6jw1strgwbh4g5 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 15A2316000D X-Rspam-User: X-HE-Tag: 1745320915-331579 X-HE-Meta: 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 fAG977L0 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 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: List-Subscribe: List-Unsubscribe: Users can obtain ksm_zero_pages of a cgroup just by: / # cat /sys/fs/cgroup/memory.ksm_stat ksm_rmap_items 76800 ksm_zero_pages 0 Current implementation supports cgroup v1 temporarily; cgroup v2 compatibility is planned for future versions. Signed-off-by: xu xin --- mm/memcontrol-v1.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/memcontrol-v1.c b/mm/memcontrol-v1.c index fa57a5deb28c..9680749f4eef 100644 --- a/mm/memcontrol-v1.c +++ b/mm/memcontrol-v1.c @@ -11,6 +11,7 @@ #include #include #include +#include #include "internal.h" #include "swap.h" @@ -1824,6 +1825,7 @@ static int memcg_numa_stat_show(struct seq_file *m, void *v) #ifdef CONFIG_KSM struct memcg_ksm_stat { unsigned long ksm_rmap_items; + long ksm_zero_pages; }; static int evaluate_memcg_ksm_stat(struct task_struct *task, void *arg) @@ -1834,6 +1836,7 @@ static int evaluate_memcg_ksm_stat(struct task_struct *task, void *arg) mm = get_task_mm(task); if (mm) { ksm_stat->ksm_rmap_items += mm->ksm_rmap_items; + ksm_stat->ksm_zero_pages += mm_ksm_zero_pages(mm); mmput(mm); } @@ -1847,9 +1850,13 @@ static int memcg_ksm_stat_show(struct seq_file *m, void *v) /* Initialization */ ksm_stat.ksm_rmap_items = 0; + ksm_stat.ksm_zero_pages = 0; + /* summing all processes'ksm statistic items of this cgroup hierarchy */ mem_cgroup_scan_tasks(memcg, evaluate_memcg_ksm_stat, &ksm_stat); + seq_printf(m, "ksm_rmap_items %lu\n", ksm_stat.ksm_rmap_items); + seq_printf(m, "ksm_zero_pages %ld\n", ksm_stat.ksm_zero_pages); return 0; } -- 2.39.3