|| ||Peter Zijlstra <firstname.lastname@example.org> |
|| ||Chris Mason <email@example.com>,
Frank Rowand <firstname.lastname@example.org>,
Ingo Molnar <email@example.com>,
Thomas Gleixner <firstname.lastname@example.org>,
Mike Galbraith <email@example.com>,
Oleg Nesterov <firstname.lastname@example.org>, Paul Turner <email@example.com>,
Jens Axboe <firstname.lastname@example.org> |
|| ||[RFC][PATCH 0/5] Reduce runqueue lock contention -v2 |
|| ||Thu, 16 Dec 2010 15:56:02 +0100|
Peter Zijlstra <email@example.com>|
|| ||Article, Thread
Hi, here a new posting of my scary patch(es) ;-)
These actually survive a sembench run (and everything else I threw at it).
The discussion between Mike and Frank over the task_running() check made me
realize what was wrong with the previous one.
As it turns out, what was needed (p->oncpu) was something Thomas wanted me
to do for an entirely different reason (see patch #2).
Frank's patch, while encouraging me to poke at it again, has a number of
very fundamental problems with it, the most serious one being that it
completely wrecks the wake-up load-balancing.
I'll try and come up with a way to unwreck the 32bit select_task_rq_fair()
problem, but for now inspiration in that departments seems lacking, yet I
still wanted to share these patches so that others can have a go at them.
If all you care about is the numbers, skip to patch #5.
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