linux-kernel - Re: [PATCH 3/4] mm: gup: use get_user_pages_fast and get_user_pages

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Message-ID: <20141012132443.GA26015@redhat.com>
Date:	Sun, 12 Oct 2014 15:24:43 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Andres Lagar-Cavilla <andreslc@...gle.com>,
	Gleb Natapov <gleb@...nel.org>,
	Radim Krcmar <rkrcmar@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Jianyu Zhan <nasa4836@...il.com>,
	Paul Cassella <cassella@...y.com>,
	Hugh Dickins <hughd@...gle.com>,
	Peter Feiner <pfeiner@...gle.com>,
	"\\\"Dr. David Alan Gilbert\\\"" <dgilbert@...hat.com>
Subject: Re: [PATCH 3/4] mm: gup: use get_user_pages_fast and
 get_user_pages_unlocked

On Thu, Oct 09, 2014 at 12:52:45PM +0200, Peter Zijlstra wrote:
> On Wed, Oct 01, 2014 at 10:56:36AM +0200, Andrea Arcangeli wrote:
> > Just an optimization.
> 
> Does it make sense to split the thing in two? One where you apply
> _unlocked and then one where you apply _fast?

Yes but I already dropped the _fast optimization, as the latency
enhancements to gup_fast were NAKed earlier in this thread. So this
patch has already been updated to only apply _unlocked.

http://git.kernel.org/cgit/linux/kernel/git/andrea/aa.git/commit/?id=bc2e0473b601c6a330ddb4adbcf4c048b2233d4e
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