Hi Steven,
FYI, we noticed the below changes on
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
ftrace/core
commit b1169cc69ba96b124df820904a6d3eb775491d7f ("tracing: Remove mock up poll
wait function")
f4874261049e3ab b1169cc69ba96b124df820904
--------------- -------------------------
191 ~15% +10060.4% 19487 ~ 8% lkp-ne04/dd-write/1HDD-ext4-2dd.4k
191 ~15% +10060.4% 19487 ~ 8% TOTAL proc-vmstat.numa_pte_updates
f4874261049e3ab b1169cc69ba96b124df820904
--------------- -------------------------
2419721 ~ 0% +88.0% 4549654 ~ 2%
lkp-ws02/dd-write/11HDD-JBOD-cfq-xfs-1dd
2419721 ~ 0% +88.0% 4549654 ~ 2% TOTAL perf-stat.context-switches
f4874261049e3ab b1169cc69ba96b124df820904
--------------- -------------------------
954 ~ 0% +52.7% 1457 ~ 0% lkp-ne04/dd-write/1HDD-ext4-2dd.4k
3932 ~ 0% +89.1% 7438 ~ 2%
lkp-ws02/dd-write/11HDD-JBOD-cfq-xfs-1dd
4887 ~ 0% +82.0% 8895 ~ 2% TOTAL vmstat.system.cs
f4874261049e3ab b1169cc69ba96b124df820904
--------------- -------------------------
163477 ~ 0% +60.1% 261769 ~ 0%
lkp-ws02/dd-write/11HDD-JBOD-cfq-xfs-1dd
163477 ~ 0% +60.1% 261769 ~ 0% TOTAL perf-stat.cpu-migrations
f4874261049e3ab b1169cc69ba96b124df820904
--------------- -------------------------
28742 ~ 0% +6.4% 30574 ~ 0%
lkp-ws02/dd-write/11HDD-JBOD-cfq-xfs-1dd
28742 ~ 0% +6.4% 30574 ~ 0% TOTAL vmstat.system.in
Legend:
~XX% - stddev percent
[+-]XX% - change percent
Thanks,
Jet
echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu10/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu11/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu12/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu13/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu14/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu15/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu4/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu5/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu6/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu7/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu8/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu9/cpufreq/scaling_governor
mkfs -t ext4 -q /dev/sda2
echo 1 > /sys/kernel/debug/tracing/events/writeback/balance_dirty_pages/enable
echo 1 > /sys/kernel/debug/tracing/events/writeback/bdi_dirty_ratelimit/enable
echo 1 > /sys/kernel/debug/tracing/events/writeback/global_dirty_state/enable
echo 1 >
/sys/kernel/debug/tracing/events/writeback/writeback_single_inode/enable
mount -t ext4 /dev/sda2 /fs/sda2
dd bs=4k if=/dev/zero of=/fs/sda2/zero-1 status=none &
dd bs=4k if=/dev/zero of=/fs/sda2/zero-2 status=none &
sleep 600
killall -9 dd
