linux-kernel - Re: Make yield_task

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Message-ID: <20080221094217.GA24162@elte.hu>
Date:	Thu, 21 Feb 2008 10:42:17 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Make yield_task_fair more efficient

* Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> I have an alternate approach in mind (that I need to find time for), 
> threaded-rbtrees. Walking the tree is really efficient, specially 
> finding successor of a node.

sure, feel free to experiment with those details.

But if you want to improve Java workloads then you should probably start 
by converting them to futexes instead of sched_yield(), that will 
probably give far more performance than micro-optimizing the 
sys_sched_yield() codepath. (especially when it happens at the expense 
of other workloads, which is not acceptable for mainline) You can 
rebuild your JVM easily and re-test with its locking fixed, right?

	Ingo
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