From: Andrew Morton <akpm@linux-foundation.org>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
LKML <linux-kernel@vger.kernel.org>,
Nick Piggin <npiggin@suse.de>,
Stewart Smith <stewart@flamingspork.com>,
linux-mm@kvack.org, linux-arch@vger.kernel.org
Subject: Re: [patch 1/2] mm: fincore()
Date: Fri, 15 Feb 2013 14:34:30 -0800 [thread overview]
Message-ID: <20130215143430.958b78ab.akpm@linux-foundation.org> (raw)
In-Reply-To: <20130215222803.GA23930@cmpxchg.org>
On Fri, 15 Feb 2013 17:28:03 -0500
Johannes Weiner <hannes@cmpxchg.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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WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
LKML <linux-kernel@vger.kernel.org>,
Nick Piggin <npiggin@suse.de>,
Stewart Smith <stewart@flamingspork.com>,
linux-mm@kvack.org, linux-arch@vger.kernel.org
Subject: Re: [patch 1/2] mm: fincore()
Date: Fri, 15 Feb 2013 14:34:30 -0800 [thread overview]
Message-ID: <20130215143430.958b78ab.akpm@linux-foundation.org> (raw)
Message-ID: <20130215223430.Jw-6i66g4ZZH10VccT84SVq2K3GPFI79agB-Qu5Chlc@z> (raw)
In-Reply-To: <20130215222803.GA23930@cmpxchg.org>
On Fri, 15 Feb 2013 17:28:03 -0500
Johannes Weiner <hannes@cmpxchg.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.
next prev parent reply other threads:[~2013-02-15 22:34 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-11 3:13 RFC: mincore: add a bit to indicate a page is dirty Rusty Russell
2013-02-11 16:27 ` Johannes Weiner
2013-02-11 22:12 ` Andrew Morton
2013-02-12 5:44 ` Rusty Russell
2013-02-15 6:34 ` [patch 1/2] mm: fincore() Johannes Weiner
2013-02-15 6:34 ` Johannes Weiner
2013-02-15 20:39 ` David Miller
2013-02-15 20:39 ` David Miller
2013-02-15 21:14 ` Andrew Morton
2013-02-15 21:14 ` Andrew Morton
2013-02-15 22:28 ` Johannes Weiner
2013-02-15 22:28 ` Johannes Weiner
2013-02-15 22:34 ` Andrew Morton [this message]
2013-02-15 22:34 ` Andrew Morton
2013-02-15 21:27 ` Andrew Morton
2013-02-15 21:27 ` Andrew Morton
2013-02-15 23:13 ` Johannes Weiner
2013-02-15 23:13 ` Johannes Weiner
2013-02-15 23:42 ` Andrew Morton
2013-02-15 23:42 ` Andrew Morton
2013-02-16 4:23 ` Rusty Russell
2013-02-16 4:23 ` Rusty Russell
2013-02-17 22:51 ` Johannes Weiner
2013-02-17 22:51 ` Johannes Weiner
2013-02-17 22:54 ` Andrew Morton
2013-02-17 22:54 ` Andrew Morton
2013-05-29 14:53 ` Andres Freund
2013-05-29 14:53 ` Andres Freund
2013-05-29 17:32 ` Johannes Weiner
2013-05-29 17:32 ` Johannes Weiner
2013-05-29 17:52 ` Andres Freund
2013-05-29 17:52 ` Andres Freund
2013-02-18 5:41 ` Rusty Russell
2013-02-18 5:41 ` Rusty Russell
2013-02-19 10:25 ` Simon Jeons
2013-02-19 10:25 ` Simon Jeons
2013-02-15 6:35 ` [patch 2/2] x86-64: hook up fincore() syscall Johannes Weiner
2013-02-15 6:35 ` Johannes Weiner
2013-02-12 5:49 ` RFC: mincore: add a bit to indicate a page is dirty Rusty Russell
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