linux-kernel - [tip:x86/pat] mm: remove !NUMA condition from PAGEFLAGS

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Message-ID: <tip-a269cca9926faf8e44b340b017be0d884203141b@git.kernel.org>
Date:	Mon, 31 Aug 2009 18:24:41 GMT
From:	"tip-bot for H. Peter Anvin" <hpa@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	suresh.siddha@...el.com, venkatesh.pallipadi@...el.com,
	tglx@...utronix.de
Subject: [tip:x86/pat] mm: remove !NUMA condition from PAGEFLAGS_EXTENDED condition set

Commit-ID:  a269cca9926faf8e44b340b017be0d884203141b
Gitweb:     http://git.kernel.org/tip/a269cca9926faf8e44b340b017be0d884203141b
Author:     H. Peter Anvin <hpa@...or.com>
AuthorDate: Mon, 31 Aug 2009 11:17:44 -0700
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Mon, 31 Aug 2009 11:17:44 -0700

mm: remove !NUMA condition from PAGEFLAGS_EXTENDED condition set

CONFIG_PAGEFLAGS_EXTENDED disables a trick to conserve pageflags.
This trick is indended to be enabled when the pressure on page flags
is very high.

The previous condition was:

-       depends on 64BIT || SPARSEMEM_VMEMMAP || !NUMA || !SPARSEMEM

... however, the sparsemem code already has a way to crowd out the
node number from the pageflags, which means that !NUMA actually
doesn't contribute to hard pageflags exhaustion.

This is required for the new PG_uncached flag to not cause pageflags
exhaustion on x86_32 + PAE + SPARSEMEM + !NUMA.

Signed-off-by: H. Peter Anvin <hpa@...or.com>
LKML-Reference: <4A9828F4.4040905@...or.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Cc: Suresh Siddha <suresh.siddha@...el.com>


---
 mm/Kconfig |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index c948d4c..fe221c7 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -153,7 +153,7 @@ config MEMORY_HOTREMOVE
 #
 config PAGEFLAGS_EXTENDED
 	def_bool y
-	depends on 64BIT || SPARSEMEM_VMEMMAP || !NUMA || !SPARSEMEM
+	depends on 64BIT || SPARSEMEM_VMEMMAP || !SPARSEMEM
 
 # Heavily threaded applications may benefit from splitting the mm-wide
 # page_table_lock, so that faults on different parts of the user address
--
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