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Date: Wed, 18 Nov 2009 10:30:29 +0100
Message-ID: <c76f371a0911180130uf125f7ev2eb4b6de1549fa04@mail.gmail.com>
Subject: Re: [RFC] observe and act upon workload parallelism: 
	PERF_TYPE_PARALLELISM (Was: [RFC][PATCH] sched_wait_block: wait for blocked 
	threads)
From: Stijn Devriendt <highguy@gmail.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Mike Galbraith <efault@gmx.de>, Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Andrea Arcangeli <andrea@suse.de>, Thomas Gleixner <tglx@linutronix.de>,
       Andrew Morton <akpm@linux-foundation.org>, peterz@infradead.org,
       linux-kernel@vger.kernel.org
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> This would be a perfect and suitable use of poll() concepts i think -
> and well-optimized one as well. It could even be plugged into epoll().
>
> ? ? ? ?Ingo

Sorry for not replying earlier, but I was knocked out on the couch
(and still am). I'll have a more thorough look later on when my head
stops spinning 'round and 'round.

I must say that even without applying this perf_event to userspace
scheduling, it's probably a nice event to have anyway in order
to measure concurrency in existing applications. That it would
be suitable to actually control parallellism is probably just a nice
extra. But let's look at things again when the clouds have left
the brain ;)

Stijn
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