linux-kernel - Re: [PATCH] selftests/ftrace: Limit number of lines processed in 'trace'

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Message-ID: <0b747522-1398-5a68-0fb2-763db6aab5b8@linuxfoundation.org>
Date:   Tue, 18 Oct 2022 16:41:20 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Shuah Khan <shuah@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Akanksha J N <akanksha@...ux.vnet.ibm.com>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] selftests/ftrace: Limit number of lines processed in
 'trace'

On 10/17/22 04:55, Naveen N. Rao wrote:
> On very large machines, ftracetest can seem to hang or otherwise take a
> very long time to complete individual tests. This can be attributed to
> statements that try to process the entire contents of 'trace'.
> 
> Limit the number of lines processed from 'trace' to resolve this. Apart
> from the change in test.d/functions to add TRACENL, this commit is the
> result of running the below command (and fixing some whitespace errors):
>    grep -l -R 'cat trace |' -- ./tools/testing/selftests/ftrace/test.d/ | \
> 	xargs -n 1 sed --in-place -e "s/cat trace |/head -\$\{TRACENL\} trace |/g"
> 
> Reported-by: Akanksha J N <akanksha@...ux.vnet.ibm.com>
> Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>

Please cc linux-kselftest list on all selftest patches.

thanks,
-- Shuah