lkml.org 
[lkml]   [2009]   [Mar]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Dynamically determine if kernel includes CFS Scheduler
FromPeter Zijlstra <>
DateFri, 06 Mar 2009 22:01:06 +0100
On Fri, 2009-03-06 at 12:44 -0800, Darren Hart wrote:
> I've received an internal request for a means to determine at run-time
> if the CFS scheduler is included in the running kernel. Looking through
> the git commit log and the /proc/sys/kernel filesystem, I think I see
> two approaches:
>
> 1) stat("/proc/sys/kernel/sched_compat_yield")
> This confirms 2.6.23-rc7 kernel or later which definitely has the CFS
> scheduler and this functionality is of interest anyway.
> 2) Test if the kernel version is >= 2.6.22 which is where I believe CFS
> landed.
>
> Any guesses as to how robust/future-proof approach #1 would be?

The question is why? Relying on scheduler specifics outside of whatever
POSIX mandates is an application bug.



\
 
 \ /
  Last update: 2009-03-06 22:03    [from the cache]
©2003-2010