linux-kernel - Re: [PATCH RFC 0/7] x86: convert ticketlocks to C and remove duplicate code

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Message-ID: <4E0512BC.5010900@goop.org>
Date:	Fri, 24 Jun 2011 15:42:04 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH RFC 0/7] x86: convert ticketlocks to C and remove duplicate
 code

On 06/24/2011 02:50 PM, H. Peter Anvin wrote:
> On 06/23/2011 06:19 PM, Jeremy Fitzhardinge wrote:
>> I've been running with this code in place for several months on 4 core
>> systems without any problems.
>>
>> I couldn't measure a consistent performance difference between the two
>> implemenations; there seemed to be +/- ~1% +/-, which is the level of
>> variation I see from simply recompiling the kernel with slightly
>> different code alignment.
>>
>> Overall, I think the large reduction in code size is a big win.
>>
> Could you give us the delta in *compiled* code size?

Sure.  Do you mean for the individual lock sequences, or for the overall
kernel?

    J
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