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    Subject[PATCH V4 17/24] perf tools: Allow auxtrace data alignment
    Date
    Allow auxtrace data to be a multiple of
    something other than page size. That is
    needed for BTS where the buffer contains
    24-byte records.

    Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
    ---
    tools/perf/util/auxtrace.c | 7 +++++++
    tools/perf/util/auxtrace.h | 1 +
    2 files changed, 8 insertions(+)

    diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
    index 8b7d59a..2d57759 100644
    --- a/tools/perf/util/auxtrace.c
    +++ b/tools/perf/util/auxtrace.c
    @@ -1186,6 +1186,13 @@ static int __auxtrace_mmap__read(struct auxtrace_mmap *mm,
    data2 = NULL;
    }

    + if (itr->alignment) {
    + unsigned int unwanted = len1 % itr->alignment;
    +
    + len1 -= unwanted;
    + size -= unwanted;
    + }
    +
    /* padding must be written by fn() e.g. record__process_auxtrace() */
    padding = size & 7;
    if (padding)
    diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
    index ed98743..7d12f33 100644
    --- a/tools/perf/util/auxtrace.h
    +++ b/tools/perf/util/auxtrace.h
    @@ -304,6 +304,7 @@ struct auxtrace_record {
    const char *str);
    u64 (*reference)(struct auxtrace_record *itr);
    int (*read_finish)(struct auxtrace_record *itr, int idx);
    + unsigned int alignment;
    };

    #ifdef HAVE_AUXTRACE_SUPPORT
    --
    1.9.1


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