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

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Message-ID: <87tvi074gg.fsf@linux.intel.com>
Date:   Tue, 22 Jan 2019 13:44:15 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jerome Glisse <jglisse@...hat.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 ?

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.

-Andi