linux-kernel - Re: [patch 1/2] mm: fincore()

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Message-Id: <20130215143430.958b78ab.akpm@linux-foundation.org>
Date:	Fri, 15 Feb 2013 14:34:30 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Stewart Smith <stewart@...mingspork.com>, linux-mm@...ck.org,
	linux-arch@...r.kernel.org
Subject: Re: [patch 1/2] mm: fincore()

On Fri, 15 Feb 2013 17:28:03 -0500
Johannes Weiner <hannes@...xchg.org> wrote:

> > Yes, and there will be immediate calmour to add more goodies to the
> > other seven bits.  PageDirty, referenced state, etc.  We should think
> > about this now, at the design stage rather than grafting things on
> > later.
> 
> I'm interested in your "etc.".  PG_error, PG_active, PG_writeback,
> page huge?

Gawd knows.  How many crazy people are there out there?

If we adopt my use-runlength-encoding suggestion then things get
easier.  We add an extra arg to the syscall which selects which
particular per-page boolean we're looking for and can gather up to 4
billion different PageFoo()s.

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