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| author | Adrian Hunter <adrian.hunter@intel.com> | 2014-07-14 12:02:51 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-07-16 22:57:36 +0200 |
| commit | 919d86d3a3109d7d4f0d7347f34711ee2f8e6609 (patch) | |
| tree | a03b196cfb5db134cb4209d7d24acf493823faae /tools/perf | |
| parent | perf symbols: Add ability to iterate over a dso's symbols (diff) | |
| download | linux-919d86d3a3109d7d4f0d7347f34711ee2f8e6609.tar.xz linux-919d86d3a3109d7d4f0d7347f34711ee2f8e6609.zip | |
perf session: Flag if the event stream is entirely in memory
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 <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/1405332185-4050-28-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/util/session.c | 9 | ||||
| -rw-r--r-- | tools/perf/util/session.h | 3 |
2 files changed, 11 insertions, 1 deletions
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index c2f4ca917469..eac14ce0ae8d 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -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; } diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h index 3140f8ae6148..0321013bd9fd 100644 --- a/tools/perf/util/session.h +++ b/tools/perf/util/session.h @@ -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; }; |