lkml.org 
[lkml]   [2010]   [Nov]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 00/20] x86: ticket lock rewrite and paravirtualization
On 11/03/2010 07:59 AM, Jeremy Fitzhardinge wrote:
>
> - with an unmodified struct spinlock, it can check to see if
> head == tail after unlock; if not, then there's someone else
> trying to lock, and we can do a kick. Unfortunately this
> generates very high level of redundant kicks, because the
> waiting CPU might not have blocked yet (which is the common
> case)
>

How high is "very high" here -- most of the time (so that any mitigation
on the slow patch is useless)?

-hpa


\
 
 \ /
  Last update: 2010-11-12 23:17    [W:0.187 / U:1.924 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site