linux-kernel - Re: [PATCH 2/2] mm: change mmap_sem over to the scalable rw

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Message-Id: <1178903537.2781.13.camel@lappy>
Date:	Fri, 11 May 2007 19:12:16 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Oleg Nesterov <oleg@...sign.ru>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH 2/2] mm: change mmap_sem over to the scalable rw_mutex

(now with reply-all)

On Fri, 2007-05-11 at 09:17 -0700, Andrew Morton wrote:
> On Fri, 11 May 2007 15:15:43 +0200 Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> 
> > -	down_write(&current->mm->mmap_sem);
> > +	rw_mutex_write_lock(&current->mm->mmap_lock);
> 
> y'know, this is such an important lock and people have had such problems
> with it and so many different schemes and ideas have popped up that I'm
> kinda thinking that we should wrap it:
> 
> 	write_lock_mm(struct mm_struct *mm);
> 	write_unlock_mm(struct mm_struct *mm);
> 	read_lock_mm(struct mm_struct *mm);
> 	read_unlock_mm(struct mm_struct *mm);
> 
> so that further experimentations become easier?

Sure, can do; it'd require a few more functions than these, but its not
too many. However, what is the best way to go about such massive rename
actions? Just push them through quickly, and make everybody cope?

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