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Subject: Re: [Bugme-new] [Bug 15618] New: 2.6.18->2.6.32->2.6.33 huge regression in performance
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From: Anton Starikov <ant.starikov@gmail.com>
In-Reply-To: <20100323111351.756c8752.akpm@linux-foundation.org>
Date: Tue, 23 Mar 2010 19:19:22 +0100
Cc: Ingo Molnar <mingo@elte.hu>,
       Linus Torvalds <torvalds@linux-foundation.org>, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org, bugzilla-daemon@bugzilla.kernel.org,
       bugme-daemon@bugzilla.kernel.org,
       Peter Zijlstra <a.p.zijlstra@chello.nl>
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References: <bug-15618-10286@https.bugzilla.kernel.org/> <20100323102208.512c16cc.akpm@linux-foundation.org> <20100323173409.GA24845@elte.hu> <20100323111351.756c8752.akpm@linux-foundation.org>
To: Andrew Morton <akpm@linux-foundation.org>
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On Mar 23, 2010, at 7:13 PM, Andrew Morton wrote:
> Anton, we have an executable binary in the bugzilla report but it would
> be nice to also have at least a description of what that code is
> actually doing.  A quick strace shows quite a lot of mprotect activity.
> A pseudo-code walkthrough, perhaps?


Right now can't say too much about the code (we just gave a chance to neighbor group to run their code on our cluster, so I'm totally unfriendly with this code). I will forward your question to them.

But probably right now you can get more information (including sources) here http://fmt.cs.utwente.nl/tools/ltsmin/

Anton