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s390/vdso: optimize getcpu system call

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Add the CPU number to the per-cpu vdso data page and add the
__kernel_getcpu function to the vdso object to retrieve the
CPU number in user space.

Suggested-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2016-01-05 13:29:38 +01:00
parent 0dab3e0e59
commit 249c543b97
9 changed files with 101 additions and 3 deletions
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2
arch/s390/include/asm/vdso.h
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@@ -38,6 +38,8 @@ struct vdso_data {
struct vdso_per_cpu_data {
__u64 ectg_timer_base;
__u64 ectg_user_time;
__u32 cpu_nr;
__u32 node_id;
};
extern struct vdso_data *vdso_data;