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    Subject[tip:perf/core] perf record: Use sw counter only if hw pmu is not detected
    Commit-ID:  5a7ed29c7572d00a75e8c4529e30c5ac2ef82271
    Gitweb: http://git.kernel.org/tip/5a7ed29c7572d00a75e8c4529e30c5ac2ef82271
    Author: Robert Richter <robert.richter@amd.com>
    AuthorDate: Thu, 5 Apr 2012 18:26:28 +0200
    Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
    CommitDate: Wed, 11 Apr 2012 17:39:19 -0300

    perf record: Use sw counter only if hw pmu is not detected

    Use cpu-clock-tick sw counter for cpu-cycles only if there is no hw
    pmu available. This is the case if the syscall reports ENOENT. In
    other cases (e.g. invalid attributes) we don't want the sw counter to
    be used.

    Cc: Ingo Molnar <mingo@kernel.org>
    Link: http://lkml.kernel.org/r/1333643188-26895-5-git-send-email-robert.richter@amd.com
    Signed-off-by: Robert Richter <robert.richter@amd.com>
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/builtin-record.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
    index be4e1ee..10b1f1f 100644
    --- a/tools/perf/builtin-record.c
    +++ b/tools/perf/builtin-record.c
    @@ -245,7 +245,7 @@ try_again:
    * based cpu-clock-tick sw counter, which
    * is always available even if no PMU support:
    */
    - if (attr->type == PERF_TYPE_HARDWARE
    + if (err == ENOENT && attr->type == PERF_TYPE_HARDWARE
    && attr->config == PERF_COUNT_HW_CPU_CYCLES) {

    if (verbose)

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