lkml.org 
[lkml]   [2019]   [Jan]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3 5/5] psi: introduce psi monitor
On Thu, Jan 24, 2019 at 01:15:18PM -0800, Suren Baghdasaryan wrote:
> + atomic_set(&group->polling, polling);
> + /*
> + * Memory barrier is needed to order group->polling
> + * write before times[] read in collect_percpu_times()
> + */
> + smp_mb__after_atomic();

That's broken, smp_mb__{before,after}_atomic() can only be used on
atomic RmW operations, something atomic_set() is _not_.

\
 
 \ /
  Last update: 2019-01-29 13:40    [W:1.346 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site