linux-kernel - Re: [PATCH] mm: save two stranding bit in gfp

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

On Wed, May 16, 2018 at 1:41 PM Vlastimil Babka <vbabka@...e.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).