From: Christoph Lameter <clameter@sgi.com>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-mm@kvack.org, Andy Whitcroft <apw@shadowen.org>,
Dave Hansen <haveblue@us.ibm.com>
Subject: Re: [PATCH] Get rid of zone_table V2
Date: Mon, 18 Sep 2006 18:20:32 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0609181815250.30365@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20060918173134.d3850903.akpm@osdl.org>
On Mon, 18 Sep 2006, Andrew Morton wrote:
> Which is pretty much the same thing. I assume your objdump was of
> an unlinked .o file, so contig_page_data shows up as 0x0.
Correct.
> The code looks OK though.
>
> It would be nice to be able to reclaim a few bits from page->flags - we're
> awfully short on them.
With the zone reduction patchset we already have an additional bit. If you
look at the i386 code it does an "and 1,ax". With the optional zone dma
patch we will have an additional bit because then there are no zones
anymore for SMP and UP. At that point page_zone() becomes a constant.
The node id is essential for NUMA locality and we cannot easily remove
that from the page flags without additional lookups.
Configurations using DISCONTIG do not need the section bits that
sparsemem requires. Sparsemem is tunable though. If you configure coarser
granularity then more bits can be recovered.
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next prev parent reply other threads:[~2006-09-19 1:20 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-18 19:21 Christoph Lameter
2006-09-18 20:28 ` Andrew Morton
2006-09-18 22:51 ` Christoph Lameter
2006-09-18 23:15 ` Andrew Morton
2006-09-18 23:46 ` Christoph Lameter
2006-09-18 23:58 ` Andrew Morton
2006-09-19 0:08 ` Christoph Lameter
2006-09-19 0:14 ` Christoph Lameter
2006-09-19 0:31 ` Andrew Morton
2006-09-19 1:20 ` Christoph Lameter [this message]
2006-09-19 6:12 ` Christoph Lameter
2006-09-19 6:33 ` Andrew Morton
2006-09-19 14:10 ` Christoph Lameter
2006-09-19 15:38 ` Andrew Morton
2006-09-19 15:41 ` Christoph Lameter
2006-09-19 16:23 ` Nick Piggin
2006-09-19 16:45 ` Nick Piggin
2006-09-19 17:50 ` Christoph Lameter
2006-09-19 18:24 ` Andi Kleen
2006-09-19 16:17 ` Nick Piggin
2006-09-24 10:06 ` Andrew Morton
2006-09-24 16:58 ` Christoph Lameter
2006-09-27 9:19 ` Andrew Morton
2006-09-27 9:26 ` Andy Whitcroft
2006-09-27 11:23 ` [PATCH] zone table removal miss merge Andy Whitcroft
2006-09-27 16:19 ` Christoph Lameter
2006-09-27 11:27 ` [PATCH] Get rid of zone_table V2 Andy Whitcroft
2006-09-27 16:24 ` Andrew Morton
2006-09-30 18:47 ` Christoph Lameter
2006-09-30 18:48 ` Christoph Lameter
2006-09-30 20:08 ` Andrew Morton
2006-10-02 15:57 ` Christoph Lameter
2006-10-02 17:10 ` Christoph Lameter
2006-10-04 10:10 ` Andy Whitcroft
2006-10-06 14:45 ` [PATCH] zoneid fix up calculations for ZONEID_PGSHIFT Andy Whitcroft
2006-10-06 17:00 ` Christoph Lameter
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