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Date: Wed, 2 Nov 2016 12:04:43 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH 2/2] mm: add PageWaiters bit to indicate waitqueue should
 be checked
Message-ID: <20161102090443.xa5223fn3avimswa@black.fi.intel.com>
References: <20161102070346.12489-1-npiggin@gmail.com>
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 <20161102073156.GA13949@node.shutemov.name>
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To: Nicholas Piggin <npiggin@gmail.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>, linux-mm <linux-mm@kvack.org>, Andrew Morton <akpm@linux-foundation.org>, Johannes Weiner <hannes@cmpxchg.org>, Jan Kara <jack@suse.cz>, Mel Gorman <mgorman@techsingularity.net>, Peter Zijlstra <peterz@infradead.org>, Rik van Riel <riel@redhat.com>, Linus Torvalds <torvalds@linux-foundation.org>, Hugh Dickins <hughd@google.com>

On Wed, Nov 02, 2016 at 07:40:24PM +1100, Nicholas Piggin wrote:
> On Wed, 2 Nov 2016 11:33:51 +0300
> "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> wrote:
> > On Wed, Nov 02, 2016 at 07:12:48PM +1100, Nicholas Piggin wrote:
> > > On Wed, 2 Nov 2016 10:58:55 +0300
> > > "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> wrote:
> > > 
> > > Oh my mistake, that should be something like PF_ONLY_HEAD, where
> > > 
> > > #define PF_ONLY_HEAD(page, enforce) ({                                    \
> > >                 VM_BUG_ON_PGFLAGS(PageTail(page), page);                  \
> > >                 page; })  
> > 
> > Feel free to rename PF_NO_TAIL :)
> > 
> 
> I think we don't need tests on non-head pages, so it's slightly different.

Ah. Okay, fair enough.

-- 
 Kirill A. Shutemov

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