x86/tlb: do flush_tlb_kernel_range by 'invlpg'

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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>

...

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Alex Shi 2012-06-28 09:02:24 +08:00 • committed by H. Peter Anvin

parent 52aec3308d

commit effee4b9b3

2 changed files with 37 additions and 6 deletions

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13

arch/x86/include/asm/tlbflush.h

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30

arch/x86/mm/tlb.c

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