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Wed, 30 Apr 2025 21:14:48 -0700 (PDT) From: xu.xin.sc@gmail.com X-Google-Original-From: xu.xin16@zte.com.cn 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 v2 4/9] memcontrol: add ksm_zero_pages in cgroup/memory.ksm_stat Date: Thu, 1 May 2025 04:14:43 +0000 Message-Id: <20250501041443.3324342-1-xu.xin16@zte.com.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250501120854885LyBCW0syCGojqnJ8crLVl@zte.com.cn> References: <20250501120854885LyBCW0syCGojqnJ8crLVl@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" From: xu xin 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 Signed-off-by: xu xin --- mm/memcontrol.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 69521a66639b..509098093bbd 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -63,6 +63,7 @@ #include #include #include +#include #include "internal.h" #include #include @@ -4391,6 +4392,7 @@ static int memory_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; }; =20 static int evaluate_memcg_ksm_stat(struct task_struct *task, void *arg) @@ -4401,6 +4403,7 @@ 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 @@ -4414,9 +4417,12 @@ 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 2.15.2