linux-kernel - Re: [patch 1/4] spinlock: lockbreak cleanup

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Message-ID: <20071101142932.GB2648@wotan.suse.de>
Date:	Thu, 1 Nov 2007 15:29:33 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	riel <riel@...hat.com>
Subject: Re: [patch 1/4] spinlock: lockbreak cleanup

On Thu, Nov 01, 2007 at 03:06:05PM +0100, Peter Zijlstra wrote:
> On Thu, 2007-11-01 at 15:02 +0100, Nick Piggin wrote:
> 
> > Rename need_lockbreak to spin_needbreak, make it use spin_is_contended to
> > decouple it from the spinlock implementation, and make it typesafe (rwlocks
> > do not have any need_lockbreak sites -- why do they even get bloated up
> > with that break_lock then?).
> 
> IIRC Lee has a few patches floating about that do introduce lockbreak
> stuff for rwlocks.

Well that would be a good reason to introduce a break_lock for them,
but previously not so much... we have rwlocks in some slightly space
critical structures (vmas, inodes, etc).

I guess it was done to make the "template" hacks eaiser. I don't really
find that in good taste, especially for important core infrastructure.
Anyway.
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