perfmonctl -接口PMU

內容簡介

#include

#include

long perfmonctl(intfd, intcmd, void *arg, intnarg);

描述

perfmonctlsystem call provides an interface to PMU (performance monitoring unit). PMU consists of PMD (performance monitoring data) registers and PMC (performance monitoring control) registers, where are gathered the hardware statistic.

perfmonctl?will apply a function?cmd?to input arguments?arg.?The number of arguments is defined by input variable?narg.?fd?specifies the perfmon context to operate on.

實現的?cmd命令是：

標簽

描述

PFM_CREATE_CONTEXT

set up a context

perfmonctl(intfd, PFM_CREATE_CONTEXT , pfarg_context_t *ctxt,1);

The?fd?parameter is ignored. A new context is created as specified in?ctxtand its file descriptor is returned in?ctxt->ctx_fd.

The file descriptor, apart from passing it to?perfmonctl, can be used to read event notifications (type?pfm_msg_t) using the?read(2) system call. Both?select(2) and?poll(2) can be used to wait for event notifications.

The context can be destroyed using the?close(2) system call.

PFM_WRITE_PMCS

set PMC registers

perfmonctl(intfd, PFM_WRITE_PMCS , pfarg_pmc_t *pmcs,n);

PFM_WRITE_PMDS

set PMD registers

perfmonctl(intfd, PFM_WRITE_PMDS , pfarg_pmd_t *pmds,n);

PFM_READ_PMDS

read PMD registers

perfmonctl(intfd, PFM_READ_PMDS , pfarg_pmd_t *pmds,n);

PFM_START

start monitoring

perfmonctl(intfd,PFM_START,arg,1);

perfmonctl(intfd,PFM_START,NULL,0);

PFM_STOP

stop monitoring

perfmonctl(intfd,PFM_START,NULL,0);

PFM_LOAD_CONTEXT

attach the context to a thread

perfmonctl(intfd, PFM_LOAD_CONTEXT ,pfarg_load_t *largs,1);

PFM_UNLOAD_CONTEXT

detach the context from a thread

perfmonctl(intfd,PFM_UNLOAD_CONTEXT,NULL,0);

PFM_RESTART

restart monitoring after recieving an overflow notification

perfmonctl(intfd,PFM_RESTART,NULL,0);

PFM_CREATE_EVTSETS

create or modify event sets

perfmonctl(intfd,PFM_CREATE_EVTSETS,pfarg_setdesc_t*desc,n);

PFM_DELETE_EVTSETS

delete event sets

perfmonctl(intfd,PFM_DELETE_EVTSET,pfarg_setdesc_t*desc,n);

PFM_GETINFO_EVTSETS

get information about event sets

perfmonctl(intfd,PFM_GETINFO_EVTSETS,pfarg_setinfo_t*info,n);

返回值

performctlreturns zero when the operation is successful. On error -1 is returned and an error code is set inerrno.

可用性

This syscall is implemented only on the IA-64 architecture since kernel 2.6.

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