linux-kernel - Re: [PATCH] testing/selftests/mqueue: Fix mq_perf

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Date:   Wed, 6 Apr 2022 14:05:46 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, shuah@...nel.org,
        linux-kselftest@...r.kernel.org, disgoel@...ux.vnet.ibm.com
Cc:     acme@...nel.org, jolsa@...nel.org, mpe@...erman.id.au,
        linux-perf-users@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, maddy@...ux.vnet.ibm.com,
        kjain@...ux.ibm.com, srikar@...ux.vnet.ibm.com,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] testing/selftests/mqueue: Fix mq_perf_tests to free the
 allocated cpu set

On 4/6/22 11:57 AM, Athira Rajeev wrote:
> The selftest "mqueue/mq_perf_tests.c" use CPU_ALLOC to allocate
> CPU set. This cpu set is used further in pthread_attr_setaffinity_np
> and by pthread_create in the code. But in current code, allocated
> cpu set is not freed. Fix this by adding CPU_FREE after its usage
> is done.
> 

Good find.

> Signed-off-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
> ---
>   tools/testing/selftests/mqueue/mq_perf_tests.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/tools/testing/selftests/mqueue/mq_perf_tests.c b/tools/testing/selftests/mqueue/mq_perf_tests.c
> index b019e0b8221c..17c41f216bef 100644
> --- a/tools/testing/selftests/mqueue/mq_perf_tests.c
> +++ b/tools/testing/selftests/mqueue/mq_perf_tests.c
> @@ -732,6 +732,7 @@ int main(int argc, char *argv[])
>   		pthread_attr_destroy(&thread_attr);
>   	}
>   
> +	CPU_FREE(cpu_set);
>   	if (!continuous_mode) {
>   		pthread_join(cpu_threads[0], &retval);
>   		shutdown((long)retval, "perf_test_thread()", __LINE__);
> 

CPU_ALLOC() is called very early on in main() and there are a
few error paths that exit without calling CPU_FREE. This change
doesn't fully fix the problem.

Review the other exit paths where CPU_FREE is needed.

thanks,
-- Shuah