lkml.org 
[lkml]   [2020]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] ring-buffer: speed up buffer resets by avoiding synchronize_rcu for each CPU
On Thu, 25 Jun 2020 15:34:03 +1000
Nicholas Piggin <npiggin@gmail.com> wrote:

> Batch these up so we disable all the per-cpu buffers first, then
> synchronize_rcu() once, then reset each of the buffers. This brings
> the time down to about 0.5s.

After applying this patch, running tools/testing/selftests/ftracetest
went from 5 minutes and 35 seconds to 5 minutes 5 seconds to complete
on my 4 core (8 with hyperthreading) machine! That's almost a 10% drop!

Thanks, I'm definitely applying this for the next merge window.

-- Steve

\
 
 \ /
  Last update: 2020-06-30 00:17    [W:0.077 / U:22.220 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site