linux-kernel - Re: [PATCH 1/4] selftests: memcg: Fix compilation

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Date:   Fri, 13 May 2022 10:40:40 -0700
From:   David Vernet <void@...ifault.com>
To:     Michal Koutný <mkoutny@...e.com>
Cc:     akpm@...ux-foundation.org, cgroups@...r.kernel.org,
        hannes@...xchg.org, kernel-team@...com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        mhocko@...nel.org, roman.gushchin@...ux.dev, shakeelb@...gle.com,
        tj@...nel.org, Richard Palethorpe <rpalethorpe@...e.de>
Subject: Re: [PATCH 1/4] selftests: memcg: Fix compilation

On Fri, May 13, 2022 at 07:18:08PM +0200, Michal Koutný wrote:
> This fixes mis-applied changes from commit 72b1e03aa725 ("cgroup:
> account for memory_localevents in test_memcg_oom_group_leaf_events()").
> 
> Signed-off-by: Michal Koutný <mkoutny@...e.com>
> ---
>  .../selftests/cgroup/test_memcontrol.c        | 25 +++++++++++--------
>  1 file changed, 14 insertions(+), 11 deletions(-)
> 
> diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
> index 6ab94317c87b..4958b42201a9 100644
> --- a/tools/testing/selftests/cgroup/test_memcontrol.c
> +++ b/tools/testing/selftests/cgroup/test_memcontrol.c
> @@ -1241,7 +1241,16 @@ static int test_memcg_oom_group_leaf_events(const char *root)
>  	if (cg_read_key_long(child, "memory.events", "oom_kill ") <= 0)
>  		goto cleanup;
>  
> -	if (cg_read_key_long(parent, "memory.events", "oom_kill ") <= 0)
> +	parent_oom_events = cg_read_key_long(
> +			parent, "memory.events", "oom_kill ");
> +	/*
> +	 * If memory_localevents is not enabled (the default), the parent should
> +	 * count OOM events in its children groups. Otherwise, it should not
> +	 * have observed any events.
> +	 */
> +	if (has_localevents && parent_oom_events != 0)
> +		goto cleanup;
> +	else if (!has_localevents && parent_oom_events <= 0)
>  		goto cleanup;
>  
>  	ret = KSFT_PASS;
> @@ -1349,20 +1358,14 @@ static int test_memcg_oom_group_score_events(const char *root)
>  	if (!cg_run(memcg, alloc_anon, (void *)MB(100)))
>  		goto cleanup;
>  
> -	parent_oom_events = cg_read_key_long(
> -			parent, "memory.events", "oom_kill ");
> -	/*
> -	 * If memory_localevents is not enabled (the default), the parent should
> -	 * count OOM events in its children groups. Otherwise, it should not
> -	 * have observed any events.
> -	 */
> -	if ((has_localevents && parent_oom_events == 0) ||
> -	     parent_oom_events > 0)
> -		ret = KSFT_PASS;
> +	if (cg_read_key_long(memcg, "memory.events", "oom_kill ") != 3)
> +		FAIL(cleanup);
>  
>  	if (kill(safe_pid, SIGKILL))
>  		goto cleanup;
>  
> +	ret = KSFT_PASS;
> +
>  cleanup:
>  	if (memcg)
>  		cg_destroy(memcg);
> -- 
> 2.35.3
> 

Thanks for the fix, Michal.

Reviewed-by: David Vernet <void@...ifault.com>