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

perf_counter: provide generic callchain bits

Browse Source 
Provide the generic callchain support bits. If hw_event->callchain is
set the arch specific perf_callchain() function is called upon to
provide a perf_callchain_entry structure filled with the current
callchain.

If it does so, it is added to the overflow output event.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Paul Mackerras <paulus@samba.org>
Orig-LKML-Reference: <20090330171024.254266860@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2009-03-30 19:07:14 +02:00
committed by Ingo Molnar
parent 023c54c422
commit 394ee07623
2 changed files with 39 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
include/linux/perf_counter.h
View File

@@ -140,8 +140,9 @@ struct perf_counter_hw_event {
include_tid : 1, /* include the tid */
mmap : 1, /* include mmap data */
munmap : 1, /* include munmap data */
callchain : 1, /* add callchain data */
__reserved_1 : 52;
__reserved_1 : 51;
__u32 extra_config_len;
__u32 __reserved_4;
@@ -219,6 +220,7 @@ enum perf_event_type {
PERF_EVENT_OVERFLOW = 1UL << 31,
__PERF_EVENT_IP = 1UL << 30,
__PERF_EVENT_TID = 1UL << 29,
__PERF_EVENT_CALLCHAIN = 1UL << 28,
};
#ifdef __KERNEL__
@@ -504,6 +506,15 @@ extern void perf_counter_mmap(unsigned long addr, unsigned long len,
extern void perf_counter_munmap(unsigned long addr, unsigned long len,
unsigned long pgoff, struct file *file);
#define MAX_STACK_DEPTH 255
struct perf_callchain_entry {
u64 nr;
u64 ip[MAX_STACK_DEPTH];
};
extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
#else
static inline void
perf_counter_task_sched_in(struct task_struct *task, int cpu) { }