diff options
author | Anton Blanchard <anton@samba.org> | 2012-07-04 16:37:11 -0400 |
---|---|---|
committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-07-11 00:18:40 -0400 |
commit | 18ad51dd342a7eb09dbcd059d0b451b616d4dafc (patch) | |
tree | 94809605669eb3b5e4e049501958a2fa93ae2de7 /arch/powerpc/kernel/vdso64/Makefile | |
parent | e6a74c6ea331b79c86e1898c504790b3dadc591d (diff) |
powerpc: Add VDSO version of getcpu
We have a request for a fast method of getting CPU and NUMA node IDs
from userspace. This patch implements a getcpu VDSO function,
similar to x86.
Ben suggested we use SPRG3 which is userspace readable. SPRG3 can be
modified by a KVM guest, so we save the SPRG3 value in the paca and
restore it when transitioning from the guest to the host.
I have a glibc patch that implements sched_getcpu on top of this.
Testing on a POWER7:
baseline: 538 cycles
vdso: 30 cycles
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/vdso64/Makefile')
-rw-r--r-- | arch/powerpc/kernel/vdso64/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/vdso64/Makefile b/arch/powerpc/kernel/vdso64/Makefile index 8c500d8622e4..effca9404b17 100644 --- a/arch/powerpc/kernel/vdso64/Makefile +++ b/arch/powerpc/kernel/vdso64/Makefile | |||
@@ -1,6 +1,6 @@ | |||
1 | # List of files in the vdso, has to be asm only for now | 1 | # List of files in the vdso, has to be asm only for now |
2 | 2 | ||
3 | obj-vdso64 = sigtramp.o gettimeofday.o datapage.o cacheflush.o note.o | 3 | obj-vdso64 = sigtramp.o gettimeofday.o datapage.o cacheflush.o note.o getcpu.o |
4 | 4 | ||
5 | # Build rules | 5 | # Build rules |
6 | 6 | ||