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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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 =20 #include "internal.h" #include "swap.h" @@ -1824,6 +1825,7 @@ static int memcg_numa_stat_show(struct seq_file *m, v= oid *v) #ifdef CONFIG_KSM struct memcg_ksm_stat { unsigned long ksm_rmap_items; + long ksm_zero_pages; }; =20 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 =3D get_task_mm(task); if (mm) { ksm_stat->ksm_rmap_items +=3D mm->ksm_rmap_items; + ksm_stat->ksm_zero_pages +=3D mm_ksm_zero_pages(mm); mmput(mm); } =20 @@ -1847,9 +1850,13 @@ static int memcg_ksm_stat_show(struct seq_file *m, v= oid *v) =20 /* Initialization */ ksm_stat.ksm_rmap_items =3D 0; + ksm_stat.ksm_zero_pages =3D 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); =20 return 0; } --=20 2.39.3