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| author |   Ravikiran G Thirumalai <kiran@scalex86.org> | 2008-12-31 13:44:46 -0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-01-02 17:16:29 +0100 |
| commit | 26799a63110dcbe81291ea53178f6b4810d07424 (patch) | |
| tree | 0bdbd0ff3ed50b310d3851f8ab203e7b9c8c4a3c /arch/x86/kernel/head64.c | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 (diff) | |
| download | linux-dev-26799a63110dcbe81291ea53178f6b4810d07424.tar.xz linux-dev-26799a63110dcbe81291ea53178f6b4810d07424.zip | |
x86: fix incorrect __read_mostly on _boot_cpu_pda
The pda rework (commit 3461b0af025251bbc6b3d56c821c6ac2de6f7209)
to remove static boot cpu pdas introduced a performance bug.
_boot_cpu_pda is the actual pda used by the boot cpu and is definitely
not "__read_mostly" and ended up polluting the read mostly section with
writes. This bug caused regression of about 8-10% on certain syscall
intensive workloads.
Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Acked-by: Mike Travis <travis@sgi.com>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/head64.c')
| -rw-r--r-- | arch/x86/kernel/head64.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 388e05a5fc17..b9a4d8c4b935 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -27,7 +27,7 @@ #include <asm/trampoline.h> /* boot cpu pda */ -static struct x8664_pda _boot_cpu_pda __read_mostly; +static struct x8664_pda _boot_cpu_pda; #ifdef CONFIG_SMP /* |