lkml.org 
[lkml]   [2010]   [Nov]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 06/13] writeback: bdi write bandwidth estimation
On Wed, Nov 24, 2010 at 09:42:09PM +0800, Peter Zijlstra wrote:
> On Wed, 2010-11-24 at 21:20 +0800, Wu Fengguang wrote:
> > > (jiffies - bdi->write_bandwidth_update_time < elapsed)
> >
> > this will be true if someone else has _done_ overlapped estimation,
> > otherwise it will equal:
> >
> > jiffies - bdi->write_bandwidth_update_time == elapsed
> >
> > Sorry the comment needs updating.
>
> Right, but its racy as hell..

Yeah, for N concurrent dirtiers, plus the background flusher, only
one is able to update write_bandwidth[_update_time]..



\
 
 \ /
  Last update: 2010-11-24 14:49    [W:0.060 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site