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Date: Mon, 18 Oct 2021 22:16:36 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Li Zhijian <lizhijian@...fujitsu.com> Cc: <mingo@...hat.com>, <shuah@...nel.org>, <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Philip Li <philip.li@...el.com>, kernel test robot <lkp@...el.com>, Masami Hiramatsu <mhiramat@...nel.org> Subject: Re: [PATCH] kselftests: ftrace: limit the executing time by reading from cached trace On Mon, 18 Oct 2021 21:26:16 +0800 Li Zhijian <lizhijian@...fujitsu.com> wrote: > LKP/0day observed that kselftests/ftrace cannot finish within 1 hour on > a 96 cpus platform where it hangs in the line like: > 'cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l' > subsystem-enable.tc > > It seems that trace will keep growing during it's read by 'cat' command. > Consequently, trace becomes too large to finish reading. > > replace 'cat trace' by: > $ sed -i 's/cat trace |/read_cached_trace |/g' $(find test.d -name "*.tc") > Instead, what happens if you add this command to each test? if [ -t options/pause-on-trace ]; then echo 1 > options/pause-on-trace fi We also need to add to the "initialize_ftrace" function in test.d/functions. if [ -t options/pause-on-trace ]; then echo 0 > options/pause-on-trace fi -- Steve > CC: Philip Li <philip.li@...el.com> > Reported-by: kernel test robot <lkp@...el.com> > Signed-off-by: Li Zhijian <lizhijian@...fujitsu.com> > ---
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