linux-kernel - Re: [PATCH 0/2] x86: fix memory leaks when doing CPU hotplug

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Message-ID: <20080811194013.GI12788@elte.hu>
Date:	Mon, 11 Aug 2008 21:40:15 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andreas Herrmann <andreas.herrmann3@....com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 0/2] x86: fix memory leaks when doing CPU hotplug


* Andreas Herrmann <andreas.herrmann3@....com> wrote:

> Following patches fix two memory leaks with CPU hotplug. Some per CPU 
> data is allocated each time a CPU is set online. But this space is 
> never freed.
> 
> Usually this memory leak is not a big deal (for normal CPU hotplug 
> usage). But during stress tests with lots of CPU offline/online cycles 
> this really matters.
> 
> The entire leak is 40K (10 pages) for each offline/online cycle per 
> CPU.  I've verified both fixes performing more than 90000 CPU 
> offline/online cycles.

applied to tip/x86/core, thanks Andreas.

> This is not a regression but I think it's still 2.6.27 material. 
> Please apply.

it's tricky code so i guess it's best to let it cook in tip/master a 
bit. If it does not show up upstream by say -rc4 time could you please 
ping us about it?

	Ingo
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