linux-kernel - Re: [PATCH] Fix rcutree grace-period-latency bug on small systems

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Message-ID: <20090105050529.GH496@one.firstfloor.org>
Date:	Mon, 5 Jan 2009 06:05:29 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, andi@...stfloor.org,
	snakebyte@....de, akpm@...ux-foundation.org, dvhltc@...ibm.com,
	niv@...ibm.com, manfred@...orfullife.com, laijs@...fujitsu.com
Subject: Re: [PATCH] Fix rcutree grace-period-latency bug on small systems

> The following patch properly updates the ->signaled field for the
> "small"-system case (no more than 32 CPUs for 32-bit kernels and no more
> than 64 CPUs for 64-bit kernels).
> 
> I believe that this patch should be included for 2.6.29.

Yes, it's really needed. One of my test system takes forever to boot
without it when tree rcu is enabled.

Thanks Paul for the debugging work.

-Andi

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