lkml.org 
[lkml]   [2010]   [Apr]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [RFC] sched: implement the exclusive wait queue as a LIFO queue
Date
Changli Gao <xiaosuo@gmail.com> wrote:

> If there isn't enough work to be done, we'd better not disrupt them
> and leave them sleeping forever to keep the scheduler happier. Do we
> have reason to keep fair to all the workers? Does it have benefit?

You've made one important assumption: the processes on the wait queue are
sleeping waiting to service things... but what if the wait queue governs
access to a resource, and all the processes on that wait queue need access to
that resource to do things? Some of the processes waiting for it may never
get a go, and so necessary work may be left undone.

So NACK.

David


\
 
 \ /
  Last update: 2010-04-28 11:33    [W:0.393 / U:0.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site