xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

perf_counter: hrtimer based sampling for software time events

Browse Source 
Use hrtimers to profile timer based sampling for the software time
counters.

This allows platforms without hardware counter support to still
perform sample based profiling.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2009-03-13 12:21:35 +01:00
committed by Ingo Molnar
parent ac17dc8e58
commit d6d020e995
2 changed files with 100 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
include/linux/perf_counter.h
View File

@@ -114,6 +114,7 @@ struct perf_counter_hw_event {
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/spinlock.h>
#include <linux/hrtimer.h>
#include <asm/atomic.h>
struct task_struct;
@@ -123,12 +124,19 @@ struct task_struct;
*/
struct hw_perf_counter {
#ifdef CONFIG_PERF_COUNTERS
u64 config;
unsigned long config_base;
unsigned long counter_base;
int nmi;
unsigned int idx;
atomic64_t count; /* software */
union {
struct { /* hardware */
u64 config;
unsigned long config_base;
unsigned long counter_base;
int nmi;
unsigned int idx;
};
union { /* software */
atomic64_t count;
struct hrtimer hrtimer;
};
};
atomic64_t prev_count;
u64 irq_period;
atomic64_t period_left;