linux-kernel - Re: [PATCH v2] selftests: cgroup: fix test_kmem

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Message-ID: <20230803160828.GA223746@cmpxchg.org>
Date:   Thu, 3 Aug 2023 12:08:28 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Lucas Karpinski <lkarpins@...hat.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Shuah Khan <shuah@...nel.org>, cgroups@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] selftests: cgroup: fix test_kmem_basic slab1 check

On Thu, Aug 03, 2023 at 12:00:47PM -0400, Lucas Karpinski wrote:
> test_kmem_basic creates 100,000 negative dentries, with each one mapping
> to a slab object. After memory.high is set, these are reclaimed through
> the shrink_slab function call which reclaims all 100,000 entries. The
> test passes the majority of the time because when slab1 is calculated,
> it is often above 0, however, 0 is also an acceptable value.
> 
> Signed-off-by: Lucas Karpinski <lkarpins@...hat.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>

> @@ -71,7 +71,7 @@ static int test_kmem_basic(const char *root)
>  
>  	cg_write(cg, "memory.high", "1M");
>  	slab1 = cg_read_key_long(cg, "memory.stat", "slab ");
> -	if (slab1 <= 0)
> +	if (slab1 < 0)
>  		goto cleanup;

This conflicts with a recent patch already queued up in -mm:

  selftests: cgroup: fix test_kmem_basic false positives

which adds a sleep(1) between cg_write() and cg_read_key_long().

Can you please rebase on top of

  git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable

and re-send the patch with

  To: Andrew Morton <akpm@...ux-foundation.org>

? Thanks