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From: Kent Overstreet To: Roman Gushchin Cc: Qi Zheng , Michal Hocko , Muchun Song , Linux-MM , linux-kernel@vger.kernel.org, Andrew Morton , Dave Chinner Subject: Re: [PATCH 2/7] mm: shrinker: Add a .to_text() method for shrinkers Message-ID: <20231201000020.2jwcdup7pklqoudf@moria.home.lan> References: <20231125003009.tbaxuquny43uwei3@moria.home.lan> <76A1EE85-B62C-49B3-889C-80F9A2A88040@linux.dev> <20231128035345.5c7yc7jnautjpfoc@moria.home.lan> <20231129231147.7msiocerq7phxnyu@moria.home.lan> <04f63966-af72-43ef-a65c-ff927064a3e4@bytedance.com> <20231130032149.ynap4ai47dj62fy3@moria.home.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: D6F7840025 X-Rspam-User: X-Stat-Signature: eko4pmsex46nixffwu1cm45dccy6k7aw X-Rspamd-Server: rspam03 X-HE-Tag: 1701388826-254725 X-HE-Meta: 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 5t6XcfaN QyEHE2Y3XTbQ3Ly/NqheXhwFWZoc960ZrIsMRemnV1+Z40OHOR2i2OFK8ar5f59FOB5cETj4kUpg75ZJKBOlOMY6OSPy5NhtNvmoNHnkgJ4YX6u8deIACeUCaUQ== 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 Thu, Nov 30, 2023 at 11:01:23AM -0800, Roman Gushchin wrote: > Ok, a simple question then: > why can't you dump /proc/slabinfo after the OOM? > > Unlike anon memory, slab memory (fs caches in particular) should not be heavily > affected by killing some userspace task. Well, currently the show_mem report dumps slab info if unreclaimable slab usage is over some threshold (50%?). So it already does what you describe - sometimes. One of the patches in this series trims that down to make it more useful; reporting on only the top 10 slabs, by mmeory usage, in sorted order and with human readable units.