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