PERFMONCTL(2) | Linux Programmer's Manual | PERFMONCTL(2) |
NAME
perfmonctl - interface to IA-64 performance monitoring unitSYNOPSIS
#include<syscall.h> #include
<perfmon.h>
long perfmonctl(int fd , int cmd , void * arg , int narg );
Note: There is no glibc wrapper for this system call; see NOTES.
DESCRIPTION
The IA-64-specific perfmonctl() system call provides an interface to the PMU (performance monitoring unit). The PMU consists of PMD (performance monitoring data) registers and PMC (performance monitoring control) registers, which gather hardware statistics.- PFM_CREATE_CONTEXT
-
perfmonctl(int fd , PFM_CREATE_CONTEXT, pfarg_context_t * ctxt , 1);
Set up a context.
- PFM_WRITE_PMCS
-
perfmonctl(int fd , PFM_WRITE_PMCS, pfarg_reg_t * pmcs , n);
Set PMC registers.
- PFM_WRITE_PMDS
-
perfmonctl(int fd , PFM_WRITE_PMDS, pfarg_reg_t * pmds , n);
Set PMD registers.
- PFM_READ_PMDS
-
perfmonctl(int fd , PFM_READ_PMDS, pfarg_reg_t * pmds , n);
Read PMD registers.
- PFM_START
-
perfmonctl(int fd , PFM_START, NULL, 0);
Start monitoring.
- PFM_STOP
-
perfmonctl(int fd , PFM_STOP, NULL, 0);
Stop monitoring.
- PFM_LOAD_CONTEXT
-
perfmonctl(int fd , PFM_LOAD_CONTEXT, pfarg_load_t * largs , 1);
Attach the context to a thread.
- PFM_UNLOAD_CONTEXT
-
perfmonctl(int fd , PFM_UNLOAD_CONTEXT, NULL, 0);
Detach the context from a thread.
- PFM_RESTART
-
perfmonctl(int fd , PFM_RESTART, NULL, 0);
Restart monitoring after receiving an overflow notification.
- PFM_GET_FEATURES
-
perfmonctl(int fd , PFM_GET_FEARURES, pfarg_features_t * arg , 1);
- PFM_DEBUG
-
perfmonctl(int fd , PFM_DEBUG, val , 0);
If val is nonzero, enable debugging mode, otherwise disable.
- PFM_GET_PMC_RESET_VAL
-
perfmonctl(int fd , PFM_GET_PMC_RESET_VAL, pfarg_reg_t * req , n);
Reset PMC registers to default values.
RETURN VALUE
performctl() returns zero when the operation is successful. On error, -1 is returned and errno is set to indicate the cause of the error.VERSIONS
perfmonctl() is available since Linux 2.4.CONFORMING TO
perfmonctl() is Linux specific and is available only on the IA-64 architecture.NOTES
Glibc does not provide a wrapper for this system call; call it using syscall(2).SEE ALSO
gprof(1)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/.2013-02-13 | Linux |