x86: vdso: pvclock gettime support

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Improve performance of time system calls when using Linux pvclock,
by reading time info from fixmap visible copy of pvclock data.

Originally from Jeremy Fitzhardinge.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

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This commit is contained in:

Marcelo Tosatti 2012-11-27 23:28:57 -02:00

parent 3dc4f7cfb7

commit 51c19b4f59

3 changed files with 101 additions and 11 deletions

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20

arch/x86/include/asm/vsyscall.h

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81

arch/x86/vdso/vclock_gettime.c

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11

arch/x86/vdso/vgetcpu.c

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