linux-kernel - Re: [PATCH v2 00/13] rwsem fast-path write lock stealing

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Message-ID: <CANN689FBCNx4NGJECTZUj90F6VZcg5R9HuwHdsUxwhvPMU7VFg@mail.gmail.com>
Date:	Sat, 27 Apr 2013 16:47:35 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	Davidlohr Bueso <davidlohr.bueso@...com>
Cc:	Alex Shi <alex.shi@...el.com>, Ingo Molnar <mingo@...nel.org>,
	David Howells <dhowells@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Peter Hurley <peter@...leysoftware.com>,
	Dave Chinner <david@...morbit.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Vinod, Chegu" <chegu_vinod@...com>
Subject: Re: [PATCH v2 00/13] rwsem fast-path write lock stealing

On Sat, Apr 27, 2013 at 2:15 PM, Davidlohr Bueso <davidlohr.bueso@...com> wrote:
> Hi Michel,
>
> On Fri, 2013-03-15 at 03:54 -0700, Michel Lespinasse wrote:
>> These patches extend Alex Shi's work (which added write lock stealing
>> on the rwsem slow path) in order to provide rwsem write lock stealing
>> on the fast path (that is, without taking the rwsem's wait_lock).
>>
>> I initially sent a shorter series shortly before v3.9, however some
>> patches were doing too much at once which made them confusing to
>> review. I have now split the series at a smaller granularity;
>> hope this will help :)
>
> Coincidentally, I was doing some similar work with similar results. But
> I have to say I like your series and cleanups better than mine :)
>
> I've run a few tests on this patchset and I'm pretty happy with the
> numbers. The first series of tests were on my quad-core laptop running
> pgbench on three different database sizes, each with various number of
> clients:

Thanks a lot for this testing. I was getting discouraged with this
series, as I would have hoped for it to be picked in -next a long long
time ago. Anyway, I will resend a v3 with the (mostly style) updates I
got from everyone on v2 and try submitting it to Linus.

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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