linux-kernel - Re: [patch] fix ptrace slowness

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Message-ID: <49C7DE25.4030706@googlemail.com>
Date:	Mon, 23 Mar 2009 20:08:21 +0100
From:	Michael Riepe <michael.riepe@...glemail.com>
To:	Miklos Szeredi <miklos@...redi.hu>
CC:	mingo@...e.hu, linux-kernel@...r.kernel.org, oleg@...hat.com,
	peterz@...radead.org, roland@...hat.com, efault@....de,
	rjw@...k.pl, jdike@...toit.com,
	user-mode-linux-devel@...ts.sourceforge.net,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	stable@...nel.org
Subject: Re: [patch] fix ptrace slowness

Hi!

Miklos Szeredi wrote:
> On Mon, 23 Mar 2009, Ingo Molnar wrote:
> 
>>* Miklos Szeredi <miklos@...redi.hu> wrote:
>>
>>
>>>This one incorporates comments from Oleg and Ingo.  Please apply 
>>>to 2.6.29 and 2.6.2[78]-stable trees.
>>
>>The fix first needs to go upstream. There's an alternative patch 
>>below. Would you mind to give it a test? Chances are that it will 
>>make UML even faster than your fix.
> 
> 
> Just the opposite.  With my patch a UML image boots in 17 seconnds,
> with your patch it boots in 33 seconds.  Without either patch it boots
> in about 5 minutes.

My strace test case runs 60% faster with this patch (compared to Ingo's).

-- 
Michael "Tired" Riepe <michael.riepe@...glemail.com>
X-Tired: Each morning I get up I die a little
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