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perf_counter: Rework the sample ABI

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The PERF_EVENT_READ implementation made me realize we don't
actually need the sample_type int the output sample, since
we already have that in the perf_counter_attr information.

Therefore, remove the PERF_EVENT_MISC_OVERFLOW bit and the
event->type overloading, and imply put counter overflow
samples in a PERF_EVENT_SAMPLE type.

This also fixes the issue that event->type was only 32-bit
and sample_type had 64 usable bits.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-06-25 11:27:12 +02:00 • committed by Ingo Molnar
parent bfbd3381e6
commit e6e18ec79b
5 changed files with 49 additions and 48 deletions
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10
include/linux/perf_counter.h
View file

@ -262,7 +262,6 @@ struct perf_counter_mmap_page {
#define PERF_EVENT_MISC_KERNEL (1 << 0)
#define PERF_EVENT_MISC_USER (2 << 0)
#define PERF_EVENT_MISC_HYPERVISOR (3 << 0)
#define PERF_EVENT_MISC_OVERFLOW (1 << 2)
struct perf_event_header {
__u32 type;
@ -348,9 +347,6 @@ enum perf_event_type {
PERF_EVENT_READ = 8,
/*
* When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
* will be PERF_SAMPLE_*
*
* struct {
* struct perf_event_header header;
*
@ -358,8 +354,9 @@ enum perf_event_type {
* { u32 pid, tid; } && PERF_SAMPLE_TID
* { u64 time; } && PERF_SAMPLE_TIME
* { u64 addr; } && PERF_SAMPLE_ADDR
* { u64 config; } && PERF_SAMPLE_CONFIG
* { u64 id; } && PERF_SAMPLE_ID
* { u32 cpu, res; } && PERF_SAMPLE_CPU
* { u64 period; } && PERF_SAMPLE_PERIOD
*
* { u64 nr;
* { u64 id, val; } cnt[nr]; } && PERF_SAMPLE_GROUP
@ -368,6 +365,9 @@ enum perf_event_type {
* u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN
* };
*/
PERF_EVENT_SAMPLE = 9,
PERF_EVENT_MAX, /* non-ABI */
};
enum perf_callchain_context {