linux-kernel - Re: [PATCH 1/4] ipc/sem.c: Fix missing wakeups in do_smart_update

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Message-ID: <51A3B9C7.7040300@colorfullife.com>
Date:	Mon, 27 May 2013 21:53:43 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Rik van Riel <riel@...hat.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Davidlohr Bueso <davidlohr.bueso@...com>, hhuang@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 1/4] ipc/sem.c: Fix missing wakeups in do_smart_update_queue()

Hi Rik,

On 05/27/2013 07:51 PM, Rik van Riel wrote:
>
> Very much not optimized, but we need to fix the regression.
>
> Acked-by: Rik van Riel <riel@...hat.com>

Thanks for the review.

I was afraid that the differences would be noticeable but they aren't:
At least on my laptop, the differences between the patches are within 
the noise:

# ./cat /proc/stat | grep ctxt;./osim 2 2 1000000 0 0;cat /proc/stat | 
grep ctxt
runtime: stock    patch 1    patch 1-4
2,0088875    2,041084    1,997367

# ./cat /proc/stat | grep ctxt;./osim 2 20 1000000 0 0;cat /proc/stat | 
grep ctxt
4,32541    4,295956    4,277817

(assuming 2 cpus, otherwise increase "2" and "20" accordingly)

Here is the link to the tool:
http://marc.info/?l=linux-kernel&m=125038376609750

--
     Manfred

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