linux-kernel - Re: [PATCH v2] oprofile, x86: Move memory allocation for ppro out of per cpu

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Message-ID: <1312202231.2617.458.camel@laptop>
Date:	Mon, 01 Aug 2011 14:37:11 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Robert Richter <robert.richter@....com>
Cc:	Maarten Lankhorst <m.b.lankhorst@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"x86@...nel.org" <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v2] oprofile, x86: Move memory allocation for ppro out
 of per cpu

On Mon, 2011-08-01 at 09:07 +0200, Robert Richter wrote:
> Can you please describe the root problem more precisely. Why can't you
> run it on -rt? What is broken? 

Because the allocators don't work from atomic context anymore. Now -rt
doesn't have a lot of real atomic contexts left so its usually not much
of a problem, but CPU_STARTING and actual IPIs are of course still
atomic.



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