mirror of https://gitee.com/openkylin/linux.git
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>
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@ -1297,8 +1297,10 @@ int __perf_session__process_events(struct perf_session *session,
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ui_progress__init(&prog, file_size, "Processing events...");
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mmap_size = MMAP_SIZE;
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if (mmap_size > file_size)
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if (mmap_size > file_size) {
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mmap_size = file_size;
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session->one_mmap = true;
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}
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memset(mmaps, 0, sizeof(mmaps));
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@ -1320,6 +1322,10 @@ int __perf_session__process_events(struct perf_session *session,
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mmaps[map_idx] = buf;
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map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
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file_pos = file_offset + head;
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if (session->one_mmap) {
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session->one_mmap_addr = buf;
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session->one_mmap_offset = file_offset;
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}
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more:
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event = fetch_mmaped_event(session, head, mmap_size, buf);
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@ -1365,6 +1371,7 @@ int __perf_session__process_events(struct perf_session *session,
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ui_progress__finish();
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perf_session__warn_about_errors(session, tool);
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perf_session_free_sample_buffers(session);
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session->one_mmap = false;
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return err;
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}
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@ -36,6 +36,9 @@ struct perf_session {
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struct trace_event tevent;
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struct events_stats stats;
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bool repipe;
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bool one_mmap;
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void *one_mmap_addr;
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u64 one_mmap_offset;
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struct ordered_samples ordered_samples;
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struct perf_data_file *file;
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};
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