From: Dave McCracken <dmccr@us.ibm.com>
To: Andrew Morton <akpm@digeo.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2.5.63] Teach page_mapped about the anon flag
Date: Mon, 03 Mar 2003 15:52:42 -0600 [thread overview]
Message-ID: <117290000.1046728362@baldur.austin.ibm.com> (raw)
In-Reply-To: <20030303133539.6594e0b6.akpm@digeo.com>
--On Monday, March 03, 2003 13:35:39 -0800 Andrew Morton <akpm@digeo.com>
wrote:
> We do need a patch I think. page_mapped() is still assuming that an
> all-bits-zero atomic_t corresponds to a zero-value atomic_t.
>
> This does appear to be true for all supported architectures, but it's a
> bit grubby.
If that's ever not true then we need extra code to initialize/rezero that
field, since we assume it's zero on alloc, and the pte_chain code also
assumes it's zero for a new page.
Dave
======================================================================
Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059
dmccr@us.ibm.com T/L 678-3059
WARNING: multiple messages have this Message-ID (diff)
From: Dave McCracken <dmccr@us.ibm.com>
To: Andrew Morton <akpm@digeo.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2.5.63] Teach page_mapped about the anon flag
Date: Mon, 03 Mar 2003 15:52:42 -0600 [thread overview]
Message-ID: <117290000.1046728362@baldur.austin.ibm.com> (raw)
In-Reply-To: <20030303133539.6594e0b6.akpm@digeo.com>
--On Monday, March 03, 2003 13:35:39 -0800 Andrew Morton <akpm@digeo.com>
wrote:
> We do need a patch I think. page_mapped() is still assuming that an
> all-bits-zero atomic_t corresponds to a zero-value atomic_t.
>
> This does appear to be true for all supported architectures, but it's a
> bit grubby.
If that's ever not true then we need extra code to initialize/rezero that
field, since we assume it's zero on alloc, and the pte_chain code also
assumes it's zero for a new page.
Dave
======================================================================
Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059
dmccr@us.ibm.com T/L 678-3059
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next prev parent reply other threads:[~2003-03-03 21:42 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-27 10:59 2.5.63-mm1 Andrew Morton
2003-02-27 10:59 ` 2.5.63-mm1 Andrew Morton
2003-02-27 21:22 ` Rising io_load results 2.5.63-mm1 Con Kolivas
2003-02-27 21:22 ` Con Kolivas
2003-02-27 21:44 ` Andrew Morton
2003-02-27 21:44 ` Andrew Morton
2003-02-27 22:01 ` Dave McCracken
2003-02-27 22:24 ` Andrew Morton
2003-02-27 22:24 ` Andrew Morton
2003-03-03 21:06 ` [PATCH 2.5.63] Teach page_mapped about the anon flag Dave McCracken
2003-03-03 21:12 ` Andrew Morton
2003-03-03 21:12 ` Andrew Morton
2003-03-03 21:24 ` Dave McCracken
2003-03-03 21:24 ` Dave McCracken
2003-03-03 21:35 ` Andrew Morton
2003-03-03 21:35 ` Andrew Morton
2003-03-03 21:52 ` Dave McCracken [this message]
2003-03-03 21:52 ` Dave McCracken
2003-03-03 22:15 ` Andrew Morton
2003-03-03 22:15 ` Andrew Morton
2003-03-04 18:32 ` [PATCH 2.5.63] Make objrmap mapcount non-atomic Dave McCracken
2003-02-27 23:56 ` Rising io_load results Re: 2.5.63-mm1 Con Kolivas
2003-02-27 23:56 ` Con Kolivas
2003-02-28 0:06 ` Andrew Morton
2003-02-28 0:06 ` Andrew Morton
2003-02-28 0:28 ` Con Kolivas
2003-02-28 0:28 ` Con Kolivas
2003-02-28 7:46 ` Duncan Sands
2003-02-28 7:46 ` Duncan Sands
2003-02-28 8:06 ` Andrew Morton
2003-02-28 8:06 ` Andrew Morton
2003-02-28 12:48 ` Hugh Dickins
2003-02-28 12:48 ` Hugh Dickins
2003-02-28 15:56 ` Dave McCracken
2003-02-28 15:56 ` Dave McCracken
2003-02-28 0:17 ` 2.5.63-mm1 Ed Tomlinson
2003-02-28 0:17 ` 2.5.63-mm1 Ed Tomlinson
2003-02-28 0:46 ` 2.5.63-mm1 Andrew Morton
2003-02-28 0:46 ` 2.5.63-mm1 Andrew Morton
2003-02-28 12:16 ` 2.5.63-mm1 steven roemen
2003-02-28 12:16 ` 2.5.63-mm1 steven roemen
2003-02-28 12:24 ` 2.5.63-mm1 Andrew Morton
2003-02-28 12:24 ` 2.5.63-mm1 Andrew Morton
[not found] ` <3E5F7DAD.2080306@cyberone.com.au>
[not found] ` <200302282227.56311.tomlins@cam.org>
2003-03-01 15:04 ` [PATCH] tiobench on UP and ptg-D3-mm1 Ed Tomlinson
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