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perf_counter: add PERF_RECORD_CPU

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Allow recording the CPU number the event was generated on.

RFC: this leaves a u32 as reserved, should we fill in the
     node_id() there, or leave this open for future extention,
     as userspace can already easily do the cpu->node mapping
     if needed.

[ Impact: extend perfcounter output record format ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090508170029.008627711@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-05-08 18:52:24 +02:00 committed by Ingo Molnar
parent a85f61abe1
commit f370e1e2f1
2 changed files with 15 additions and 0 deletions
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2
include/linux/perf_counter.h
View file

@ -105,6 +105,7 @@ enum perf_counter_record_format {
PERF_RECORD_GROUP = 1U << 4,
PERF_RECORD_CALLCHAIN = 1U << 5,
PERF_RECORD_CONFIG = 1U << 6,
PERF_RECORD_CPU = 1U << 7,
};
/*
@ -260,6 +261,7 @@ enum perf_event_type {
* { u64 time; } && PERF_RECORD_TIME
* { u64 addr; } && PERF_RECORD_ADDR
* { u64 config; } && PERF_RECORD_CONFIG
* { u32 cpu, res; } && PERF_RECORD_CPU
*
* { u64 nr;
* { u64 event, val; } cnt[nr]; } && PERF_RECORD_GROUP

13
kernel/perf_counter.c
View file

@ -1956,6 +1956,9 @@ static void perf_counter_output(struct perf_counter *counter,
struct perf_callchain_entry *callchain = NULL;
int callchain_size = 0;
u64 time;
struct {
u32 cpu, reserved;
} cpu_entry;
header.type = 0;
header.size = sizeof(header);
@ -1999,6 +2002,13 @@ static void perf_counter_output(struct perf_counter *counter,
header.size += sizeof(u64);
}
if (record_type & PERF_RECORD_CPU) {
header.type |= PERF_RECORD_CPU;
header.size += sizeof(cpu_entry);
cpu_entry.cpu = raw_smp_processor_id();
}
if (record_type & PERF_RECORD_GROUP) {
header.type |= PERF_RECORD_GROUP;
header.size += sizeof(u64) +
@ -2037,6 +2047,9 @@ static void perf_counter_output(struct perf_counter *counter,
if (record_type & PERF_RECORD_CONFIG)
perf_output_put(&handle, counter->hw_event.config);
if (record_type & PERF_RECORD_CPU)
perf_output_put(&handle, cpu_entry);
/*
* XXX PERF_RECORD_GROUP vs inherited counters seems difficult.
*/