linux-kernel - Re: sched_yield: delete sysctl_sched_compat

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Message-ID: <20071127111707.GA18727@elte.hu>
Date:	Tue, 27 Nov 2007 12:17:07 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: sched_yield: delete sysctl_sched_compat_yield


* Zhang, Yanmin <yanmin_zhang@...ux.intel.com> wrote:

> If echo "1">/proc/sys/kernel/sched_compat_yield before starting 
> volanoMark testing, the result is very good with kernel 2.6.24-rc3 on 
> my 16-core tigerton.

yep, that's known and has been discussed in detail on lkml. Java should 
use something more suitable than sched_yield for its locking. Yield will 
always be dependent on scheduling details and _some_ category of apps 
will always hurt. That's why we offer the sched_compat_yield flag.

	Ingo
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