lkml.org 
[lkml]   [2011]   [Aug]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] memcg: remove unneeded preempt_disable
From
Date
On Thu, 2011-08-25 at 13:46 -0500, Christoph Lameter wrote:
>
> RISC cpus have instruction to construct complex atomic actions by the cpu
> as I have shown before for ARM.

Right, but it only makes sense if the whole thing remains cheaper than
the trivial implementation already available.

For instance, the ARM LL/SC constraints pretty much mandate we do
preempt_disable()/preempt_enable() around them, at which point the point
of doing LL/SC is gone (except maybe for the irqsafe_this_cpu_* stuff).


\
 
 \ /
  Last update: 2011-08-25 20:53    [W:0.720 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site