GETCPU(2) | Linux Programmer's Manual | GETCPU(2) |
NAME
getcpu - determine CPU and NUMA node on which the calling thread is runningSYNOPSIS
#include<linux/getcpu.h>
int getcpu(unsigned * cpu , unsigned * node , struct getcpu_cache * tcache );
DESCRIPTION
The getcpu() system call identifies the processor and node on which the calling thread or process is currently running and writes them into the integers pointed to by the cpu and node arguments. The processor is a unique small integer identifying a CPU. The node is a unique small identifier identifying a NUMA node. When either cpu or node is NULL nothing is written to the respective pointer.RETURN VALUE
On success, 0 is returned. On error, -1 is returned, and errno is set appropriately.ERRORS
- EFAULT
- Arguments point outside the calling process's address space.
VERSIONS
getcpu() was added in kernel 2.6.19 for x86_64 and i386.CONFORMING TO
getcpu() is Linux specific.NOTES
Linux makes a best effort to make this call as fast possible. The intention of getcpu() is to allow programs to make optimizations with per-CPU data or for NUMA optimization.SEE ALSO
mbind(2), sched_setaffinity(2), set_mempolicy(2), sched_getcpu(3), cpuset(7)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.2013-04-03 | Linux |