diff options
| author | Alex Shi <alex.shi@intel.com> | 2012-06-28 09:02:24 +0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2012-06-27 19:29:14 -0700 |
| commit | effee4b9b3b0aa5770bcd98de5f672b05b27703c (patch) | |
| tree | b167657ec2ba05797b925a93e7e1b45222ac5ac3 /arch/x86/include/asm/tlbflush.h | |
| parent | 52aec3308db85f4e9f5c8b9f5dc4fbd0138c6fa4 (diff) | |
| download | linux-effee4b9b3b0aa5770bcd98de5f672b05b27703c.tar.gz linux-effee4b9b3b0aa5770bcd98de5f672b05b27703c.tar.xz | |
x86/tlb: do flush_tlb_kernel_range by 'invlpg'
This patch do flush_tlb_kernel_range by 'invlpg'. The performance pay
and gain was analyzed in previous patch
(x86/flush_tlb: try flush_tlb_single one by one in flush_tlb_range).
In the testing: http://lkml.org/lkml/2012/6/21/10
The pay is mostly covered by long kernel path, but the gain is still
quite clear, memory access in user APP can increase 30+% when kernel
execute this funtion.
Signed-off-by: Alex Shi <alex.shi@intel.com>
Link: http://lkml.kernel.org/r/1340845344-27557-10-git-send-email-alex.shi@intel.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/include/asm/tlbflush.h')
| -rw-r--r-- | arch/x86/include/asm/tlbflush.h | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index 621b959e1dbf..b5a27bd77669 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -123,6 +123,12 @@ static inline void reset_lazy_tlbstate(void) { } +static inline void flush_tlb_kernel_range(unsigned long start, + unsigned long end) +{ + flush_tlb_all(); +} + #else /* SMP */ #include <asm/smp.h> @@ -139,6 +145,7 @@ extern void flush_tlb_current_task(void); extern void flush_tlb_page(struct vm_area_struct *, unsigned long); extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, unsigned long end, unsigned long vmflag); +extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); #define flush_tlb() flush_tlb_current_task() @@ -168,10 +175,4 @@ static inline void reset_lazy_tlbstate(void) native_flush_tlb_others(mask, mm, start, end) #endif -static inline void flush_tlb_kernel_range(unsigned long start, - unsigned long end) -{ - flush_tlb_all(); -} - #endif /* _ASM_X86_TLBFLUSH_H */ |