Commit 5a52f33a authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo

perf session: Add perf_session__peek_event()

Add a function to peek at other events in the event stream.
Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1406786474-9306-15-git-send-email-adrian.hunter@intel.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 60b0896c
......@@ -897,6 +897,61 @@ static void event_swap(union perf_event *event, bool sample_id_all)
swap(event, sample_id_all);
}
int perf_session__peek_event(struct perf_session *session, off_t file_offset,
void *buf, size_t buf_sz,
union perf_event **event_ptr,
struct perf_sample *sample)
{
union perf_event *event;
size_t hdr_sz, rest;
int fd;
if (session->one_mmap && !session->header.needs_swap) {
event = file_offset - session->one_mmap_offset +
session->one_mmap_addr;
goto out_parse_sample;
}
if (perf_data_file__is_pipe(session->file))
return -1;
fd = perf_data_file__fd(session->file);
hdr_sz = sizeof(struct perf_event_header);
if (buf_sz < hdr_sz)
return -1;
if (lseek(fd, file_offset, SEEK_SET) == (off_t)-1 ||
readn(fd, &buf, hdr_sz) != (ssize_t)hdr_sz)
return -1;
event = (union perf_event *)buf;
if (session->header.needs_swap)
perf_event_header__bswap(&event->header);
if (event->header.size < hdr_sz)
return -1;
rest = event->header.size - hdr_sz;
if (readn(fd, &buf, rest) != (ssize_t)rest)
return -1;
if (session->header.needs_swap)
event_swap(event, perf_evlist__sample_id_all(session->evlist));
out_parse_sample:
if (sample && event->header.type < PERF_RECORD_USER_TYPE_START &&
perf_evlist__parse_sample(session->evlist, event, sample))
return -1;
*event_ptr = event;
return 0;
}
static s64 perf_session__process_event(struct perf_session *session,
union perf_event *event,
struct perf_tool *tool,
......
......@@ -45,6 +45,11 @@ void perf_session__delete(struct perf_session *session);
void perf_event_header__bswap(struct perf_event_header *hdr);
int perf_session__peek_event(struct perf_session *session, off_t file_offset,
void *buf, size_t buf_sz,
union perf_event **event_ptr,
struct perf_sample *sample);
int __perf_session__process_events(struct perf_session *session,
u64 data_offset, u64 data_size, u64 size,
struct perf_tool *tool);
......
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