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authorAndi Kleen <ak@suse.de>2006-09-26 04:52:28 -0400
committerAndi Kleen <andi@basil.nowhere.org>2006-09-26 04:52:28 -0400
commit3cfc348bf90ffaa777c188652aa297f04eb94de8 (patch)
tree8908d6a5a61e54ab422ec7f4800d6ac591695423 /include/linux/syscalls.h
parentc08c820508233b424deab3302bc404bbecc6493a (diff)
[PATCH] x86: Add portable getcpu call
For NUMA optimization and some other algorithms it is useful to have a fast to get the current CPU and node numbers in user space. x86-64 added a fast way to do this in a vsyscall. This adds a generic syscall for other architectures to make it a generic portable facility. I expect some of them will also implement it as a faster vsyscall. The cache is an optimization for the x86-64 vsyscall optimization. Since what the syscall returns is an approximation anyways and user space often wants very fast results it can be cached for some time. The norma methods to get this information in user space are relatively slow The vsyscall is in a better position to manage the cache because it has direct access to a fast time stamp (jiffies). For the generic syscall optimization it doesn't help much, but enforce a valid argument to keep programs portable I only added an i386 syscall entry for now. Other architectures can follow as needed. AK: Also added some cleanups from Andrew Morton Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/linux/syscalls.h')
-rw-r--r--include/linux/syscalls.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 008f04c56737..3f0f716225ec 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -53,6 +53,7 @@ struct mq_attr;
53struct compat_stat; 53struct compat_stat;
54struct compat_timeval; 54struct compat_timeval;
55struct robust_list_head; 55struct robust_list_head;
56struct getcpu_cache;
56 57
57#include <linux/types.h> 58#include <linux/types.h>
58#include <linux/aio_abi.h> 59#include <linux/aio_abi.h>
@@ -596,5 +597,6 @@ asmlinkage long sys_get_robust_list(int pid,
596 size_t __user *len_ptr); 597 size_t __user *len_ptr);
597asmlinkage long sys_set_robust_list(struct robust_list_head __user *head, 598asmlinkage long sys_set_robust_list(struct robust_list_head __user *head,
598 size_t len); 599 size_t len);
600asmlinkage long sys_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *cache);
599 601
600#endif 602#endif