[tracing] b1169cc69ba: +10060.4% proc-vmstat.numa_pte_updates

[Jet Chen]

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