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authorAdrian Hunter <adrian.hunter@intel.com>2014-07-14 14:02:51 +0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-07-17 00:57:36 +0400
commit919d86d3a3109d7d4f0d7347f34711ee2f8e6609 (patch)
treea03b196cfb5db134cb4209d7d24acf493823faae /tools/perf
parent9c00a81b6aafc4ed375a43e7a54e6cf2d720c7c6 (diff)
downloadlinux-919d86d3a3109d7d4f0d7347f34711ee2f8e6609.tar.xz
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.c9
-rw-r--r--tools/perf/util/session.h3
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;
};