diff options
| author | Ravikiran G Thirumalai <kiran@scalex86.org> | 2008-12-31 13:44:46 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-01-18 10:35:29 -0800 |
| commit | fce821c44244459592f22bec255e217795de4c02 (patch) | |
| tree | 4169a1ad30d1a5807f43ef2f6b13eef8ba3c6d3a | |
| parent | 11fea7ace7b0086f853854df8653d1c8f90a9fb9 (diff) | |
x86: fix incorrect __read_mostly on _boot_cpu_pda
commit 26799a63110dcbe81291ea53178f6b4810d07424 upstream.
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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -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 9bfc4d72fb2..290cb546130 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -26,7 +26,7 @@ #include <asm/bios_ebda.h> /* boot cpu pda */ -static struct x8664_pda _boot_cpu_pda __read_mostly; +static struct x8664_pda _boot_cpu_pda; #ifdef CONFIG_SMP /* |