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perf session: Flag if the event stream is entirely in memory

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Flag if the event stream is a file that has been mmapped in one go.

This is useful, for example, if a tool needs to keep an event for later
reference.  If the new flag is set, a pointer to the event can be
retained, otherwise the event must be copied.

Signed-off-by: Adrian Hunter <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Adrian Hunter 2014-07-14 13:02:51 +03:00 • committed by Arnaldo Carvalho de Melo
commit 919d86d3a3
2 changed files with 11 additions and 1 deletions
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9
tools/perf/util/session.c
View file

@ -1297,8 +1297,10 @@ int __perf_session__process_events(struct perf_session *session,
ui_progress__init(&prog, file_size, "Processing events...");
mmap_size = MMAP_SIZE;
if (mmap_size > file_size)
if (mmap_size > file_size) {
mmap_size = file_size;
session->one_mmap = true;
}
memset(mmaps, 0, sizeof(mmaps));
@ -1320,6 +1322,10 @@ remap:
mmaps[map_idx] = buf;
map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
file_pos = file_offset + head;
if (session->one_mmap) {
session->one_mmap_addr = buf;
session->one_mmap_offset = file_offset;
}
more:
event = fetch_mmaped_event(session, head, mmap_size, buf);
@ -1365,6 +1371,7 @@ out_err:
ui_progress__finish();
perf_session__warn_about_errors(session, tool);
perf_session_free_sample_buffers(session);
session->one_mmap = false;
return err;
}

3
tools/perf/util/session.h
View file

@ -36,6 +36,9 @@ struct perf_session {
struct trace_event tevent;
struct events_stats stats;
bool repipe;
bool one_mmap;
void *one_mmap_addr;
u64 one_mmap_offset;
struct ordered_samples ordered_samples;
struct perf_data_file *file;
};