perf trace: Make --pf honour --min-stack too

To check deeply nested page fault callchains.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-wuji34xx003kr88nmqt6jkgf@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index fc276d718172008e682118a5e1f71c44ff08edc1..a4b133fac82bae09a9ce1eee2bf8112ea0294f6f 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2190,8 +2190,19 @@ static int trace__pgfault(struct trace *trace,
        char map_type = 'd';
        struct thread_trace *ttrace;
        int err = -1;
+       int callchain_ret = 0;
 
        thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
+
+       if (sample->callchain) {
+               callchain_ret = trace__resolve_callchain(trace, evsel, sample, &callchain_cursor);
+               if (callchain_ret == 0) {
+                       if (callchain_cursor.nr < trace->min_stack)
+                               goto out_put;
+                       callchain_ret = 1;
+               }
+       }
+
        ttrace = thread__trace(thread, trace->output);
        if (ttrace == NULL)
                goto out_put;
@@ -2234,10 +2245,10 @@ static int trace__pgfault(struct trace *trace,
 
        fprintf(trace->output, " (%c%c)\n", map_type, al.level);
 
-       if (sample->callchain) {
-               if (trace__resolve_callchain(trace, evsel, sample, &callchain_cursor) == 0)
-                       trace__fprintf_callchain(trace, sample);
-       }
+       if (callchain_ret > 0)
+               trace__fprintf_callchain(trace, sample);
+       else if (callchain_ret < 0)
+               pr_err("Problem processing %s callchain, skipping...\n", perf_evsel__name(evsel));
 out:
        err = 0;
 out_put: