[lkml]   [2007]   [May]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [patch] CFS scheduler, -v8
On Wed, May 02, 2007 at 11:18:45PM -0400, Ting Yang wrote:
> I just want to point out that ->wait_runtime, in fact, stores the lag of
> each task in CFS, except that it is also used by other things, and
> occasionally tweaked (heuristically ?). Under normal cases the sum of
> lags of all active tasks in such a system, should be a constant 0. The
> lag information is equally important to EEVDF, when some tasks leave the
> system (becomes inactive) carrying certain amount of lag. The key point
> here is that we have to spread the lag (either negative or positive) to
> all remaining task, so that the fairness of the system is preserved. I
> thinks CFS implementation does not seems to handle this properly.
> I am running out time today :-( I will write an email about CFS -v8
> tomorrow, describing 2 issues in CFS I found related to this.

Interesting. I haven't look at the code carefully but that wouldn't
surprise me if this was the case and it led to odd corner cases.

I'm eagerly waiting your analysis and explanation.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-05-03 12:21    [W:0.079 / U:32.940 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site