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perf_counter: re-arrange the perf_event_type

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Breaks ABI yet again :-)

Change the event type so that [0, 2^31-1] are regular event types, but
[2^31, 2^32-1] forms a bitmask for overflow events.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Paul Mackerras <paulus@samba.org>
Orig-LKML-Reference: <20090330171024.047961770@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-03-30 19:07:12 +02:00 committed by Ingo Molnar
parent 78d613eb12
commit 5ed00415e3
2 changed files with 29 additions and 33 deletions
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6
include/linux/perf_counter.h
View File

@ -210,13 +210,15 @@ struct perf_event_header {
};
enum perf_event_type {
PERF_EVENT_IP = 0,
PERF_EVENT_GROUP = 1,
PERF_EVENT_MMAP = 2,
PERF_EVENT_MUNMAP = 3,
__PERF_EVENT_TID = 0x100,
PERF_EVENT_OVERFLOW = 1UL << 31,
__PERF_EVENT_IP = 1UL << 30,
__PERF_EVENT_TID = 1UL << 29,
};
#ifdef __KERNEL__

56
kernel/perf_counter.c
View File

@ -1754,50 +1754,44 @@ static void perf_output_end(struct perf_output_handle *handle)
rcu_read_unlock();
}
static int perf_output_write(struct perf_counter *counter, int nmi,
void *buf, ssize_t size)
{
struct perf_output_handle handle;
int ret;
ret = perf_output_begin(&handle, counter, size, nmi);
if (ret)
goto out;
perf_output_copy(&handle, buf, size);
perf_output_end(&handle);
out:
return ret;
}
static void perf_output_simple(struct perf_counter *counter,
int nmi, struct pt_regs *regs)
{
unsigned int size;
int ret;
struct perf_output_handle handle;
struct perf_event_header header;
u64 ip;
struct {
struct perf_event_header header;
u64 ip;
u32 pid, tid;
} event;
} tid_entry;
event.header.type = PERF_EVENT_IP;
event.ip = instruction_pointer(regs);
header.type = PERF_EVENT_OVERFLOW;
header.size = sizeof(header);
size = sizeof(event);
ip = instruction_pointer(regs);
header.type |= __PERF_EVENT_IP;
header.size += sizeof(ip);
if (counter->hw_event.include_tid) {
/* namespace issues */
event.pid = current->group_leader->pid;
event.tid = current->pid;
tid_entry.pid = current->group_leader->pid;
tid_entry.tid = current->pid;
event.header.type |= __PERF_EVENT_TID;
} else
size -= sizeof(u64);
header.type |= __PERF_EVENT_TID;
header.size += sizeof(tid_entry);
}
event.header.size = size;
ret = perf_output_begin(&handle, counter, header.size, nmi);
if (ret)
return;
perf_output_write(counter, nmi, &event, size);
perf_output_put(&handle, header);
perf_output_put(&handle, ip);
if (counter->hw_event.include_tid)
perf_output_put(&handle, tid_entry);
perf_output_end(&handle);
}
static void perf_output_group(struct perf_counter *counter, int nmi)