[lkml]   [2011]   [Jul]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 1/3] perf: add context field to perf_event
On Tue, 2011-07-12 at 12:16 +0300, Avi Kivity wrote:
> On 07/12/2011 12:14 PM, Peter Zijlstra wrote:
> > On Tue, 2011-07-12 at 12:08 +0300, Avi Kivity wrote:
> > > Similar, but with stronger guarantees: when the function is called,
> > > current == p, and the task was either sleeping or in userspace.
> >
> > If the task is sleeping, current can never be p.
> The guarantee is that the task was sleeping just before the function is
> called. Of course it's woken up to run the function.
> The idea is that you run the function in a known safe point to avoid
> extra synchronization.

I'd much rather we didn't wake the task and let it sleep, that's usually
a very safe place for tasks to be. All you'd need is a guarantee it
won't be woken up while you're doing your thing.

 \ /
  Last update: 2011-07-12 11:57    [W:0.123 / U:0.744 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site