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Tue, 11 Aug 2020 08:06:09 -0700 (PDT) Date: Tue, 11 Aug 2020 11:05:05 -0400 From: Johannes Weiner To: Roman Gushchin Cc: Andrew Morton , Dennis Zhou , Tejun Heo , Christoph Lameter , Michal Hocko , Shakeel Butt , linux-mm@kvack.org, kernel-team@fb.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 3/5] mm: memcg/percpu: per-memcg percpu memory statistics Message-ID: <20200811150505.GA650506@cmpxchg.org> References: <20200623184515.4132564-1-guro@fb.com> <20200623184515.4132564-4-guro@fb.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200623184515.4132564-4-guro@fb.com> X-Rspamd-Queue-Id: B5191180F9824 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 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: On Tue, Jun 23, 2020 at 11:45:13AM -0700, Roman Gushchin wrote: > Percpu memory can represent a noticeable chunk of the total memory > consumption, especially on big machines with many CPUs. Let's track > percpu memory usage for each memcg and display it in memory.stat. > > A percpu allocation is usually scattered over multiple pages (and nodes), > and can be significantly smaller than a page. So let's add a byte-sized > counter on the memcg level: MEMCG_PERCPU_B. Byte-sized vmstat infra > created for slabs can be perfectly reused for percpu case. > > Signed-off-by: Roman Gushchin > Acked-by: Dennis Zhou Acked-by: Johannes Weiner