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[PATCH 4/4] perf, tool: Fix 32 bit values endianity swap for sample_id_all header

 

 

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jolsa at redhat

May 4, 2012, 10:11 AM

Post #1 of 1 (68 views)
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[PATCH 4/4] perf, tool: Fix 32 bit values endianity swap for sample_id_all header

We swap the sample_id_all header by u64 pointers. Some members
of the header happen to be 32 bit values. We need to handle them
separatelly.

Signed-off-by: Jiri Olsa <jolsa [at] redhat>
---
tools/perf/util/evsel.c | 32 +++++++++++++++++++++++++-------
1 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 8c13dbc..ea053b7 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -403,16 +403,27 @@ int perf_evsel__open_per_thread(struct perf_evsel *evsel,
}

static int perf_event__parse_id_sample(const union perf_event *event, u64 type,
- struct perf_sample *sample)
+ struct perf_sample *sample,
+ bool swapped)
{
const u64 *array = event->sample.array;
+ union {
+ u64 val64;
+ u32 val32[2];
+ } u;

array += ((event->header.size -
sizeof(event->header)) / sizeof(u64)) - 1;

if (type & PERF_SAMPLE_CPU) {
- u32 *p = (u32 *)array;
- sample->cpu = *p;
+ u.val64 = *array;
+ if (swapped) {
+ /* undo swap of u64, then swap on individual u32s */
+ u.val64 = bswap_64(u.val64);
+ u.val32[0] = bswap_32(u.val32[0]);
+ }
+
+ sample->cpu = u.val32[0];
array--;
}

@@ -432,9 +443,16 @@ static int perf_event__parse_id_sample(const union perf_event *event, u64 type,
}

if (type & PERF_SAMPLE_TID) {
- u32 *p = (u32 *)array;
- sample->pid = p[0];
- sample->tid = p[1];
+ u.val64 = *array;
+ if (swapped) {
+ /* undo swap of u64, then swap on individual u32s */
+ u.val64 = bswap_64(u.val64);
+ u.val32[0] = bswap_32(u.val32[0]);
+ u.val32[1] = bswap_32(u.val32[1]);
+ }
+
+ sample->pid = u.val32[0];
+ sample->tid = u.val32[1];
}

return 0;
@@ -474,7 +492,7 @@ int perf_event__parse_sample(const union perf_event *event, u64 type,
if (event->header.type != PERF_RECORD_SAMPLE) {
if (!sample_id_all)
return 0;
- return perf_event__parse_id_sample(event, type, data);
+ return perf_event__parse_id_sample(event, type, data, swapped);
}

array = event->sample.array;
--
1.7.7.6

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