Messages in this thread Patch in this message | | | From | Namhyung Kim <> | Subject | [PATCH v2] perf kmem: Show warning when trying to run stat without record | Date | Tue, 5 May 2015 09:58:12 +0900 |
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Sometimes one can mistakenly run perf kmem stat without perf kmem record before or different configuration like recoding --slab and stat --page. Show a warning message like below to inform user:
# perf kmem stat --page --caller Not found page events. Have you run 'perf kmem record --page' before?
Acked-by: Pekka Enberg <penberg@kernel.org> Signed-off-by: Namhyung Kim <namhyung@kernel.org> --- Use perf_evlist__find_tracepoint_by_name().
tools/perf/builtin-kmem.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c index 828b7284e547..5868b4347925 100644 --- a/tools/perf/builtin-kmem.c +++ b/tools/perf/builtin-kmem.c @@ -1882,6 +1882,7 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused) }; struct perf_session *session; int ret = -1; + const char errmsg[] = "Not found %s events. Have you run 'perf kmem record --%s' before?\n"; perf_config(kmem_config, NULL); argc = parse_options_subcommand(argc, argv, kmem_options, @@ -1908,11 +1909,21 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused) if (session == NULL) return -1; + if (kmem_slab) { + if (!perf_evlist__find_tracepoint_by_name(session->evlist, + "kmem:kmalloc")) { + pr_err(errmsg, "slab", "slab"); + return -1; + } + } + if (kmem_page) { - struct perf_evsel *evsel = perf_evlist__first(session->evlist); + struct perf_evsel *evsel; - if (evsel == NULL || evsel->tp_format == NULL) { - pr_err("invalid event found.. aborting\n"); + evsel = perf_evlist__find_tracepoint_by_name(session->evlist, + "kmem:mm_page_alloc"); + if (evsel == NULL) { + pr_err(errmsg, "page", "page"); return -1; } -- 2.3.7
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