linux-kernel - Re: [PATCH mm-unstable v1 2/2] mm, swap: add pages allocated for struct swap

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Message-ID: <427pnhob4jjh6shhwypbsvaqgqvikgvxche2llbieagksbu2je@dwneoygkvixc>
Date: Mon, 4 Nov 2024 17:22:06 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Kinsey Ho <kinseyho@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
	Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...nel.org>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Shakeel Butt <shakeel.butt@...ux.dev>, 
	Muchun Song <muchun.song@...ux.dev>, Pasha Tatashin <pasha.tatashin@...een.com>, 
	David Rientjes <rientjes@...gle.com>, willy@...radead.org, Vlastimil Babka <vbabka@...e.cz>, 
	David Hildenbrand <david@...hat.com>, Joel Granados <joel.granados@...nel.org>, 
	Kaiyang Zhao <kaiyang2@...cmu.edu>, Sourav Panda <souravpanda@...gle.com>, 
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH mm-unstable v1 2/2] mm, swap: add pages allocated for
 struct swap_cgroup to vmstat

Hello Kinsey.

On Thu, Oct 31, 2024 at 10:45:51PM GMT, Kinsey Ho <kinseyho@...gle.com> wrote:
> Export the number of pages allocated for storing struct swap_cgroup in
> vmstat using global system-wide counters.

This consumption is quite static (it only changes between swapon/swapoff
switches). The resulting value can be calculated as a linear combination
of entries in /proc/swaps already (if you know the right coefficients).

I'm not sure this warrants the new entry (or is my assumption about
static-ness wrong?)

Michal

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