[lkml]   [2019]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH RESEND] block: annotate refault stalls from IO submission
On 8/8/19 1:03 PM, Johannes Weiner wrote:
> psi tracks the time tasks wait for refaulting pages to become
> uptodate, but it does not track the time spent submitting the IO. The
> submission part can be significant if backing storage is contended or
> when cgroup throttling (io.latency) is in effect - a lot of time is
> spent in submit_bio(). In that case, we underreport memory pressure.
> Annotate submit_bio() to account submission time as memory stall when
> the bio is reading userspace workingset pages.

Applied for 5.4.

Jens Axboe

 \ /
  Last update: 2019-08-14 16:51    [W:0.066 / U:92.444 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site