linux-kernel - Re: [PATCH v7 5/6] selftests/resctrl: Commonize the signal handler register/unregister for all tests

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Date:   Mon, 13 Feb 2023 11:21:19 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Shaopeng Tan <tan.shaopeng@...fujitsu.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Shuah Khan <shuah@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v7 5/6] selftests/resctrl: Commonize the signal handler
 register/unregister for all tests

Hi Shaopeng,

On 2/12/2023 10:24 PM, Shaopeng Tan wrote:
> After creating a child process with fork() in CAT test, if a signal such
> as SIGINT is received, the parent process will be terminated immediately,
> and therefor the child process will not be killed and also resctrlfs is
> not unmounted.
> 
> There is a signal handler registered in CMT/MBM/MBA tests, which kills
> child process, unmount resctrlfs, cleanups result files, etc., if a
> signal such as SIGINT is received.
> 
> Commonize the signal handler registered for CMT/MBM/MBA tests and
> reuse it in CAT.
> 
> To reuse the signal handler to kill child process use global bm_pid
> instead of local bm_pid.
> 
> Also, since the MBA/MBA/CMT/CAT are run in order, unregister the signal
> handler at the end of each test so that the signal handler cannot be
> inherited by other tests.
> 
> Signed-off-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Thank you very much

Reinette