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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-08-10 11:16:52 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-08-10 11:33:09 +0200 |
| commit | a044560c3a1f0ad75ce685c1ed7604820b9ed319 (patch) | |
| tree | 51fa4979ad02d388b35e1a56020bfbd8c2e5329d | |
| parent | c0a8865e32c8d1a562db38e06ef31ef23282f646 (diff) | |
| download | linux-a044560c3a1f0ad75ce685c1ed7604820b9ed319.tar.bz2 | |
perf_counter: Correct PERF_SAMPLE_RAW output
PERF_SAMPLE_* output switches should unconditionally output the
correct format, as they are the only way to unambiguously parse
the PERF_EVENT_SAMPLE data.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1249896447.17467.74.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | include/linux/perf_counter.h | 2 | ||||
| -rw-r--r-- | include/trace/ftrace.h | 3 | ||||
| -rw-r--r-- | kernel/perf_counter.c | 30 |
3 files changed, 28 insertions, 7 deletions
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index 2aabe43c1d04..a9d823a93fe8 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -369,6 +369,8 @@ enum perf_event_type { * * { u64 nr, * u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN + * { u32 size; + * char data[size];}&& PERF_SAMPLE_RAW * }; */ PERF_EVENT_SAMPLE = 9, diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h index 7fb16d90e7b1..7167b9b97da2 100644 --- a/include/trace/ftrace.h +++ b/include/trace/ftrace.h @@ -685,7 +685,8 @@ static void ftrace_profile_##call(proto) \ pc = preempt_count(); \ \ __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \ - __entry_size = ALIGN(__data_size + sizeof(*entry), sizeof(u64));\ + __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\ + sizeof(u64)); \ \ do { \ char raw_data[__entry_size]; \ diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 546e62d62941..5229d1666fa5 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -2646,7 +2646,6 @@ static void perf_counter_output(struct perf_counter *counter, int nmi, u64 counter; } group_entry; struct perf_callchain_entry *callchain = NULL; - struct perf_raw_record *raw = NULL; int callchain_size = 0; u64 time; struct { @@ -2716,9 +2715,15 @@ static void perf_counter_output(struct perf_counter *counter, int nmi, } if (sample_type & PERF_SAMPLE_RAW) { - raw = data->raw; - if (raw) - header.size += raw->size; + int size = sizeof(u32); + + if (data->raw) + size += data->raw->size; + else + size += sizeof(u32); + + WARN_ON_ONCE(size & (sizeof(u64)-1)); + header.size += size; } ret = perf_output_begin(&handle, counter, header.size, nmi, 1); @@ -2784,8 +2789,21 @@ static void perf_counter_output(struct perf_counter *counter, int nmi, } } - if ((sample_type & PERF_SAMPLE_RAW) && raw) - perf_output_copy(&handle, raw->data, raw->size); + if (sample_type & PERF_SAMPLE_RAW) { + if (data->raw) { + perf_output_put(&handle, data->raw->size); + perf_output_copy(&handle, data->raw->data, data->raw->size); + } else { + struct { + u32 size; + u32 data; + } raw = { + .size = sizeof(u32), + .data = 0, + }; + perf_output_put(&handle, raw); + } + } perf_output_end(&handle); } |