Em Tue, Apr 21, 2015 at 01:55:07PM +0900, Namhyung Kim escreveu: > 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@xxxxxxxxxx> > Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx> > --- > tools/perf/builtin-kmem.c | 31 ++++++++++++++++++++++++++++--- > 1 file changed, 28 insertions(+), 3 deletions(-) > > diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c > index 828b7284e547..f29a766f18f8 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 +1909,35 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused) > if (session == NULL) > return -1; > > + if (kmem_slab) { > + struct perf_evsel *evsel; > + bool found = false; > + > + evlist__for_each(session->evlist, evsel) { > + if (!strcmp(perf_evsel__name(evsel), "kmem:kmalloc")) { > + found = true; > + break; > + } > + } We have: struct perf_evsel * perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist, const char *name); Example of it being used in 'perf trace': evsel = perf_evlist__find_tracepoint_by_name(session->evlist, "raw_syscalls:sys_enter"); /* older kernels have syscalls tp versus raw_syscalls */ if (evsel == NULL) evsel = perf_evlist__find_tracepoint_by_name(session->evlist, "syscalls:sys_enter"); Applied 1-5, can you please resubmit this one with this change? - Arnaldo > + if (!found) { > + pr_err(errmsg, "slab", "slab"); > + return -1; > + } > + } > + > if (kmem_page) { > - struct perf_evsel *evsel = perf_evlist__first(session->evlist); > + struct perf_evsel *evsel; > + bool found = false; > > - if (evsel == NULL || evsel->tp_format == NULL) { > - pr_err("invalid event found.. aborting\n"); > + evlist__for_each(session->evlist, evsel) { > + if (!strcmp(perf_evsel__name(evsel), > + "kmem:mm_page_alloc")) { > + found = true; > + break; > + } > + } > + if (!found) { > + pr_err(errmsg, "page", "page"); > return -1; > } > > -- > 2.3.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>