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From: Shakeel Butt <shakeelb@google.com>
Date: Wed, 16 May 2018 14:21:35 -0700
Message-ID: <CALvZod6PebHBeqp_kJ47S_vMYKmHnAP5er4+03O=5XGFiyHfHA@mail.gmail.com>
Subject: Re: [PATCH] mm: save two stranding bit in gfp_mask
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Sender: owner-linux-mm@kvack.org
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To: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Greg Thelen <gthelen@google.com>, Mel Gorman <mgorman@techsingularity.net>, Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>

On Wed, May 16, 2018 at 1:41 PM Vlastimil Babka <vbabka@suse.cz> wrote:
> On 05/16/2018 10:20 PM, Shakeel Butt wrote:
> > ___GFP_COLD and ___GFP_OTHER_NODE were removed but their bits were
> > stranded. Slide existing gfp masks to make those two bits available.
> Well, there are already available for hypothetical new flags. Is there
> anything that benefits from a smaller __GFP_BITS_SHIFT?

I am prototyping to pass along the type of kmem allocation e.g. page table,
vmalloc, stack e.t.c. (still very preliminary).