linux-kernel - Re: [PATCH v2] misc_cgroup: use a counter to count the number of failures

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Message-ID: <20210824164423.GA11859@blackbody.suse.cz>
Date:   Tue, 24 Aug 2021 18:44:23 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     brookxu <brookxu.cn@...il.com>
Cc:     tj@...nel.org, lizefan.x@...edance.com, hannes@...xchg.org,
        vipinsh@...gle.com, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org
Subject: Re: [PATCH v2] misc_cgroup: use a counter to count the number of
 failures

Hello.

On Sat, Aug 14, 2021 at 08:15:16AM +0800, brookxu <brookxu.cn@...il.com> wrote:
> 1. If a large number of containers are created and deleted,
>    there will be a lot of error logs.
> 2. According to an error log, we cannot better understand
>    the actual pressure of resources.
> 
> Therefore, perhaps we should use a failcnt counter to count
> the number of failures, so that we can easily understand the
> actual pressure of resources and avoid too many error log..

This is an understandable use case and generally the implementation via
the counter is good as well.

However, the non-hierarchical failcnt interface looks like v1ism to me
(I think new features should come with v2 first in mind).
What about exposing this in misc.events file with max.$res_name entries? 

Or if the hierarchical reporting is unnecessary now, there can be just
misc.events.local for starters.

(That reminds me the forgotten pids.events[.local] rework [1], oops.)

Michal

https://lore.kernel.org/lkml/20191128172612.10259-1-mkoutny@suse.com/#t