linux-kernel - [RFC,PATCH 0/2] do_wait() wakeup optimization

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Message-ID: <20090622170432.GA4895@redhat.com>
Date:	Mon, 22 Jun 2009 19:04:32 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Ratan Nalumasu <rnalumasu@...il.com>,
	Roland McGrath <roland@...hat.com>,
	Vitaly Mayatskikh <vmayatsk@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [RFC,PATCH 0/2] do_wait() wakeup optimization

Now that we have struct wait_opts, it is easy to solve the problems with
unnecessary wakeups from __wake_up_parent(). See the previous discussion

	"+ do_wait-wakeup-optimization.patch added to -mm tree"
	http://marc.info/?t=122729873300001

However, this complicates the code a bit and adds bytes 112 to compiled
code.

Ratan, Roland, do you think this optimisation is worthwhile?

Oleg.

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