linux-kernel - Re: [PATCH V2 2/2] Documentation: filesystems: introduce proc/slabinfo to users

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Date: Mon, 19 Feb 2024 14:23:33 +0800
From: zhang fangzheng <fangzheng.zhang1003@...il.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Fangzheng Zhang <fangzheng.zhang@...soc.com>, Christoph Lameter <cl@...ux.com>, 
	Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>, 
	Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Vlastimil Babka <vbabka@...e.cz>, Roman Gushchin <roman.gushchin@...ux.dev>, 
	Hyeonggon Yoo <42.hyeyoo@...il.com>, Greg KH <gregkh@...uxfoundation.org>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, tkjos@...gle.com, 
	Yuming Han <yuming.han@...soc.com>, Chunyan Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH V2 2/2] Documentation: filesystems: introduce
 proc/slabinfo to users

On Mon, Feb 19, 2024 at 12:24 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Mon, Feb 19, 2024 at 11:19:11AM +0800, Fangzheng Zhang wrote:
> > +Note, <slabreclaim> comes from the collected results in the file
> > +/sys/kernel/slab/$cache/reclaim_account. Next, we will mark /proc/slabinfo
> > +as deprecated and recommend the use of either sysfs directly or
> > +use of the "slabinfo" tool that we have been providing in linux/tools/mm.
>
> Wait, so you're going to all of the trouble of changing the format of
> slabinfo (with the associated costs of updating every tool that currently
> parses it), only to recommend that we stop using it and start using
> tools/mm/slabinfo instead?
>

The initial purpose was to obtain the type of each slab through
a simple command 'cat proc/slabinfo'. So here, my intention is not to
update all slabinfo-related tools for the time being, but to modify
the version number of proc/slabinfo and further display the results
of using the command.

> How about we simply do nothing?

The note here means what changes will occur after
we modify the version number of proc/slabinfo to 2.2.
As for the replacement of tools/mm/slabinfo (that inspired
by Christoph’s suggestions), it will be implemented in the next version
or even the later version.

Thanks!