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    Subject[PATCH v0 18/71] perf session: Flag if the event stream is entirely in memory
    Date
    From: Adrian Hunter <adrian.hunter@intel.com>

    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>
    ---
    tools/perf/util/session.c | 9 ++++++++-
    tools/perf/util/session.h | 3 +++
    2 files changed, 11 insertions(+), 1 deletion(-)

    diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
    index 8a7da6f..10ac07a 100644
    --- a/tools/perf/util/session.c
    +++ b/tools/perf/util/session.c
    @@ -1305,8 +1305,10 @@ 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));

    @@ -1328,6 +1330,10 @@ 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);
    @@ -1373,6 +1379,7 @@ 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 004d3e8..ca1d734 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;
    };
    --
    1.8.5.1


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