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| author | H. Peter Anvin <hpa@zytor.com> | 2009-08-31 11:17:44 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-08-31 11:17:44 -0700 |
| commit | a269cca9926faf8e44b340b017be0d884203141b (patch) | |
| tree | 992a9ab46250d958d9663fd5b64479c95fbe7732 /mm/Kconfig | |
| parent | 47d25003cbd9e9030a95f7ccc4e70fec6aa7b844 (diff) | |
| download | lwn-a269cca9926faf8e44b340b017be0d884203141b.tar.gz lwn-a269cca9926faf8e44b340b017be0d884203141b.zip | |
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@zytor.com>
LKML-Reference: <4A9828F4.4040905@zytor.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Suresh Siddha <suresh.siddha@intel.com>
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index c948d4ca8bde..fe221c7df752 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 |