linux-kernel - Re: [LSF/MM TOPIC] Page flags, can we free up space ?

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Message-ID: <20190122235207.GC4747@redhat.com>
Date:   Tue, 22 Jan 2019 18:52:07 -0500
From:   Jerome Glisse <jglisse@...hat.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     lsf-pc@...ts.linux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [LSF/MM TOPIC] Page flags, can we free up space ?

On Tue, Jan 22, 2019 at 01:44:15PM -0800, Andi Kleen wrote:
> Jerome Glisse <jglisse@...hat.com> writes:
> >
> > Right now this is more a temptative ie i do not know if i will succeed,
> > in any case i can report on failure or success and discuss my finding to
> > get people opinions on the matter.
> 
> I would just stop putting node/zone number into the flags. These
> could be all handled with a small perfect hash table, like the original
> x86_64 port did, which should be quite cheap to look up.
> Then there should be enough bits for everyone again.

Definitly something i will look into, i was scare to remove those.

Cheers,
Jérôme