]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
mm/damon: add 'age' of region tracepoint support
authorXin Hao <xhao@linux.alibaba.com>
Fri, 14 Jan 2022 22:09:37 +0000 (14:09 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 15 Jan 2022 14:30:32 +0000 (16:30 +0200)
commitc46b0bb6a735db0b6140e12e750b5acb1b032982
treeb6255668ce120e920e30beaf96647c4938695d0d
parentb627b774911660852ce7f3f3817955ddad2bd130
mm/damon: add 'age' of region tracepoint support

In Damon, we can get age information by analyzing the nr_access change,
But short time sampling is not effective, we have to obtain enough data
for analysis through long time trace, this also means that we need to
consume more cpu resources and storage space.

Now the region add a new 'age' variable, we only need to get the change of
age value through a little time trace, for example, age has been
increasing to 141, but nr_access shows a value of 0 at the same time,
Through this,we can conclude that the region has a very low nr_access
value for a long time.

Link: https://lkml.kernel.org/r/b9def1262af95e0dc1d0caea447886434db01161.1636989871.git.xhao@linux.alibaba.com
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/trace/events/damon.h