netdev - Re: [PATCH v6 2/2] decrement static keys on real destroy time

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Date:	Wed, 23 May 2012 13:33:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	<linux-mm@...ck.org>, <cgroups@...r.kernel.org>,
	<devel@...nvz.org>, <kamezawa.hiroyu@...fujitsu.com>,
	<netdev@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH v6 2/2] decrement static keys on real destroy time

On Wed, 23 May 2012 13:16:36 +0400
Glauber Costa <glommer@...allels.com> wrote:

> On 05/23/2012 02:46 AM, Andrew Morton wrote:
> > Here, we're open-coding kinda-test_bit().  Why do that?  These flags are
> > modified with set_bit() and friends, so we should read them with the
> > matching test_bit()?
> 
> My reasoning was to be as cheap as possible, as you noted yourself two
> paragraphs below.

These aren't on any fast path, are they?

Plus: you failed in that objective!  The C compiler's internal
scalar->bool conversion makes these functions no more efficient than
test_bit().

> > So here are suggested changes from*some*  of the above discussion.
> > Please consider, incorporate, retest and send us a v7?
> 
> How do you want me to do it? Should I add your patch ontop of mine,
> and then another one that tweaks whatever else is left, or should I just
> merge those changes into the patches I have?

A brand new patch, I guess.  I can sort out the what-did-he-change view
at this end.

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