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AGHT+IEwEjYO6pbdTzpOQwwF5PJX1YyD+PzcDAA6tLXdH03HNNfX60nXN+2m4+GA24ynohbZGrQKBMcpA2LhAMJI9yA= X-Received: by 2002:a92:c267:0:b0:3f0:70c1:2ca9 with SMTP id e9e14a558f8ab-3f3fd18b311mr363966335ab.0.1757094217951; Fri, 05 Sep 2025 10:43:37 -0700 (PDT) MIME-Version: 1.0 References: <20250902-show_mem_zspages-v2-1-545daaa8b410@igalia.com> In-Reply-To: <20250902-show_mem_zspages-v2-1-545daaa8b410@igalia.com> From: Nhat Pham Date: Fri, 5 Sep 2025 10:43:26 -0700 X-Gm-Features: Ac12FXzDLYaqMKpvmLPOXMb7wIRAdgl5L2hjUr5ikag9JEtMKW0UJSmOz8j3uPA Message-ID: Subject: Re: [PATCH v2] mm: show_mem: show number of zspages in show_free_areas To: Thadeu Lima de Souza Cascardo Cc: Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Minchan Kim , Sergey Senozhatsky , Yosry Ahmed , Chengming Zhou , SeongJae Park , Lorenzo Stoakes , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-dev@igalia.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 137E8180004 X-Rspam-User: X-Stat-Signature: nh13tiwahdmcagw3f3m3tzhhekp9z9hz X-Rspamd-Server: rspam09 X-HE-Tag: 1757094218-700188 X-HE-Meta: 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 WrPp/6r4 vz4iU+RSUsXNzXzQ3PjwQy3Z5fvQaeJJWSInP/LwkU6t/VgSHY18d3xRz820mBwmAWzb7QQ6iKC+MGsoggsAJsVoLzd7N/yAr5+7AOi1Uqa7WOsNGA1goY7YDFlyZYVKvA3xmJvCb0ABFa39V/hSg/hl/O3raNeSLBsxs9YuBWMiYip8nVctxkUqzgHoltIkBQ8hOxghlBaJAbRebGZK1l5XTMmSVCSjqHIjIGvmhVU2SOQxUEZvTiNEAueUwOAlrDlAvQgeJh8D7spJuonpzUF20RpmpfPyTIS+C2syJMykpvQsqszdFI96bM33/pR8o8S9sz5Rc6vo/c9sbFZ2US+oq6R/DoArDNPnR/sWlNzuDbHHllZ0bNn3FV/B6CQuqpcXtIFHKXc8Y/7YIyg0eylxLETdHnSwx8XVuJlG6ef0QVtcQSyRaaP5KQ+JustSbdWJE7J0uVzyCeyZ94BZ6VoxTGE/jMvNURPKr8PEpX2gzGmc= 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: On Tue, Sep 2, 2025 at 5:50=E2=80=AFAM Thadeu Lima de Souza Cascardo wrote: > > When OOM is triggered, it will show where the pages might be for each zon= e. > When using zram or zswap, it might look like lots of pages are missing. > After this patch, zspages are shown as below. > > [ 48.792859] Node 0 DMA free:2812kB boost:0kB min:60kB low:72kB high:84= kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inactive_ano= n:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB zs= pages:11160kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_p= cp:0kB local_pcp:0kB free_cma:0kB > [ 48.792962] lowmem_reserve[]: 0 956 956 956 956 > [ 48.792988] Node 0 DMA32 free:3512kB boost:0kB min:3912kB low:4888kB h= igh:5864kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inac= tive_anon:28kB active_file:8kB inactive_file:16kB unevictable:0kB writepend= ing:0kB zspages:916780kB present:1032064kB managed:978944kB mlocked:0kB bou= nce:0kB free_pcp:500kB local_pcp:248kB free_cma:0kB > [ 48.793118] lowmem_reserve[]: 0 0 0 0 0 > > Signed-off-by: Thadeu Lima de Souza Cascardo > --- > v2: > - fix build when CONFIG_ZSMALLOC is not enabled > --- > mm/show_mem.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/mm/show_mem.c b/mm/show_mem.c > index 41999e94a56d623726ea92f3f38785e8b218afe5..c563d9adfa87765a8736e91c1= f68d824b03eaea8 100644 > --- a/mm/show_mem.c > +++ b/mm/show_mem.c > @@ -310,6 +310,7 @@ static void show_free_areas(unsigned int filter, node= mask_t *nodemask, int max_z > " inactive_file:%lukB" > " unevictable:%lukB" > " writepending:%lukB" > + " zspages:%lukB" > " present:%lukB" > " managed:%lukB" > " mlocked:%lukB" > @@ -332,6 +333,11 @@ static void show_free_areas(unsigned int filter, nod= emask_t *nodemask, int max_z > K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE)), > K(zone_page_state(zone, NR_ZONE_UNEVICTABLE)), > K(zone_page_state(zone, NR_ZONE_WRITE_PENDING)), > +#if IS_ENABLED(CONFIG_ZSMALLOC) > + K(zone_page_state(zone, NR_ZSPAGES)), > +#else > + 0UL, > +#endif > K(zone->present_pages), > K(zone_managed_pages(zone)), > K(zone_page_state(zone, NR_MLOCK)), > > --- > base-commit: b320789d6883cc00ac78ce83bccbfe7ed58afcf0 > change-id: 20250902-show_mem_zspages-d090ea0bd1d4 > > Best regards, > -- > Thadeu Lima de Souza Cascardo > FWIW: Acked-by: Nhat Pham