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Date: Wed, 2 Nov 2016 19:40:24 +1100
From: Nicholas Piggin <npiggin@gmail.com>
Subject: Re: [PATCH 2/2] mm: add PageWaiters bit to indicate waitqueue
 should be checked
Message-ID: <20161102194024.57f2d3c7@roar.ozlabs.ibm.com>
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To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.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, 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.

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