linux-kernel - Re: [PATCH 07/10] generic rwsem: implement down_read_critical() / up_read

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Date:	Mon, 17 May 2010 16:13:31 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Howells <dhowells@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Waychison <mikew@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Ying Han <yinghan@...gle.com>
Subject: Re: [PATCH 07/10] generic rwsem: implement down_read_critical() /
	up_read_critical()

On Mon, May 17, 2010 at 03:44:24PM -0700, Linus Torvalds wrote:
> You didn't update the comment for the new name here...
> 
> > - when the rwsem is write owned, down_read_unfair() callers get queued in
> >   front of threads trying to acquire the rwsem by other means.
> 
> .. or here. In this case, it really is more about "unfairness", but I'm 
> not convinced it should be so in the naming anyway, even if internally it 
> might be __down_read_unfair. "critical" I think covers both.

Gah! Sorry for missing the comment updates. I agree with you on the naming,
I just didn't remember about the comment.

Will send identical patch with the correct comment as reply to this.

> Anyway, the series looks mostly acceptable to me in this form. I think it 
> conceptually works out, and I think that the non-preemption guarantee 
> should mean that starvation of writers is not likely an issue. However, 
> I'd definitely like some second opinions on it. I'm not going to apply 
> this series without acks from people. So you should try to convince DavidH 
> too that this actually really does matter and makes sense.

I'll see what I can do here. Thanks !

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