linux-kernel - Re: [PATCH v2 1/2] memcg: introduce kfuncs for fetching memcg stats

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Message-ID: <sw2zbwvfadqxi7pvlwhyt4xlbfujonckowovvie53kejqzup5a@3w2dmlkblm3g>
Date: Wed, 15 Oct 2025 13:48:27 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: JP Kobryn <inwardvessel@...il.com>
Cc: andrii@...nel.org, ast@...nel.org, mkoutny@...e.com, 
	yosryahmed@...gle.com, hannes@...xchg.org, tj@...nel.org, akpm@...ux-foundation.org, 
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org, linux-mm@...ck.org, bpf@...r.kernel.org, 
	kernel-team@...a.com
Subject: Re: [PATCH v2 1/2] memcg: introduce kfuncs for fetching memcg stats

On Wed, Oct 15, 2025 at 12:08:12PM -0700, JP Kobryn wrote:
> Reading from the memory.stat file can be expensive because of the string
> encoding/decoding and text filtering involved. Introduce three kfuncs for
> fetching each type of memcg stat from a bpf program. This allows data to be
> transferred directly to userspace, eliminating the need for string
> encoding/decoding. It also removes the need for text filtering since it
> allows for fetching specific stats.
> 
> The patch also includes a kfunc for flushing stats in order to read the
> latest values. Note that this is not required for fetching stats, since the
> kernel periodically flushes memcg stats. It is left up to the programmer
> whether they want more recent stats or not.
> 
> Signed-off-by: JP Kobryn <inwardvessel@...il.com>

Acked-by: Shakeel Butt <shakeel.butt@...ux.dev>