lkml.org 
[lkml]   [2011]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH tip/core/rcu 0/6] Check for use of RCU from dyntick-idle mode
On Fri, Jul 08, 2011 at 08:43:31AM -0700, Paul E. McKenney wrote:
> Hello!
>
> This set of patches adds checks for use of RCU from "extended quiescent
> states" such as dyntick-idle mode. Such use is grossly illegal because
> RCU by definition ignores CPUs that are in extended quiescent states.
> In the case of dyntick-idle mode, the only way for RCU to avoid ignoring
> such CPUs would be to wake them up periodically, which would defeat the
> whole purpose of dyntick-idle mode.
>
> The good news is that Frederic got this effort started. The bad news is
> that there are several cases where RCU read-side critical sections appear
> in dyntick-idle mode.

Ok, let me send to you the patch that splits up rcu/tickless logic and I'll try
to fix up what you reported to me in ppc.

BTW, are you aware of other cases? You mentioned "several" :)


\
 
 \ /
  Last update: 2011-07-11 18:05    [W:0.046 / U:0.596 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site