lkml.org 
[lkml]   [2015]   [Sep]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 3/3] Revert "task_work: remove fifo ordering guarantee"
From
On Tue, Sep 8, 2015 at 10:39 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> The other patches I do like - why add those list operations that are
> just guaranteed to mess up the cache to add the file descriptors to
> the workqueue list, when we can just do the operation directly?

Side note, it's not just messing with the cache unnecessarily when the
lists grow long, the "cmpxchg" involved in adding the work is fairly
expensive. It may be an unlocked operation, but it's generally as
expensive as a locked one - just without the possibility of a
deadlock.

Linus


\
 
 \ /
  Last update: 2015-09-08 20:01    [W:0.073 / U:0.380 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site