linux-kernel - Re: [PATCH] cgroup: Add documentation for missing zswap memory.stat

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Message-ID: <20240501120205.GB2538005@cmpxchg.org>
Date: Wed, 1 May 2024 08:02:05 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Usama Arif <usamaarif642@...il.com>
Cc: tj@...nel.org, lizefan.x@...edance.com, nphamcs@...il.com,
	corbet@....net, linux-mm@...ck.org, cgroups@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...a.com
Subject: Re: [PATCH] cgroup: Add documentation for missing zswap memory.stat

On Wed, May 01, 2024 at 10:53:49AM +0100, Usama Arif wrote:
> This includes zswpin, zswpout and zswpwb.

Good idea adding these!

> Signed-off-by: Usama Arif <usamaarif642@...il.com>
> ---
>  Documentation/admin-guide/cgroup-v2.rst | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
> index 17e6e9565156..48ec54627814 100644
> --- a/Documentation/admin-guide/cgroup-v2.rst
> +++ b/Documentation/admin-guide/cgroup-v2.rst
> @@ -1454,6 +1454,15 @@ PAGE_SIZE multiple when read back.
>  	  zswapped
>  		Amount of application memory swapped out to zswap.
>  
> +	  zswpin
> +		Number of pages moved in to memory from zswap.
> +
> +	  zswpout
> +		Number of pages moved out of memory to zswap.
> +
> +	  zswpwb
> +		Number of pages written from zswap to swap.
> +

They should go between pglazyfreed and thp_fault_alloc to match the
output ordering (they're event counters, not memory counters).

>  	  file_mapped
>  		Amount of cached filesystem data mapped with mmap()
>