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perf kmem: Show warning when trying to run stat without record 

Sometimes one can mistakenly run 'perf kmem stat' without running 'perf
kmem record' before or with a different configuration like recording
--slab and stat --page.  Show a warning message like the one below to
inform the user:

  # perf kmem stat --page --caller
  No page allocation events found.  Have you run 'perf kmem record --page'?

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/1430837572-31395-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2015-05-05 23:52:52 +09:00 committed by Arnaldo Carvalho de Melo
parent b1019d5e6e
commit a923e2c4b1
1 changed files with 15 additions and 4 deletions
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19
tools/perf/builtin-kmem.c
View File

@ -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[] = "No %s allocation events found. Have you run 'perf kmem record --%s'?\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_page) {
struct perf_evsel *evsel = perf_evlist__first(session->evlist);
if (kmem_slab) {
if (!perf_evlist__find_tracepoint_by_name(session->evlist,
"kmem:kmalloc")) {
pr_err(errmsg, "slab", "slab");
return -1;
}
}
if (evsel == NULL || evsel->tp_format == NULL) {
pr_err("invalid event found.. aborting\n");
if (kmem_page) {
struct perf_evsel *evsel;
evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
"kmem:mm_page_alloc");
if (evsel == NULL) {
pr_err(errmsg, "page", "page");
return -1;
}