Messages in this thread | | | Date | Mon, 18 Oct 2021 22:16:36 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH] kselftests: ftrace: limit the executing time by reading from cached trace |
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On Mon, 18 Oct 2021 21:26:16 +0800 Li Zhijian <lizhijian@cn.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@intel.com> > Reported-by: kernel test robot <lkp@intel.com> > Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> > ---
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