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-rw-r--r--tools/perf/builtin-report.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index aebba565934..1e2f5dde312 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -40,6 +40,7 @@ static int dump_trace = 0;
static int verbose;
static int full_paths;
+static int collapse_syscalls;
static unsigned long page_size;
static unsigned long mmap_window = 32;
@@ -983,6 +984,15 @@ process_overflow_event(event_t *event, unsigned long offset, unsigned long head)
for (i = 0; i < chain->nr; i++)
dprintf("..... %2d: %p\n", i, (void *)chain->ips[i]);
}
+ if (collapse_syscalls) {
+ /*
+ * Find the all-but-last kernel entry
+ * amongst the call-chains - to get
+ * to the level of system calls:
+ */
+ if (chain->kernel >= 2)
+ ip = chain->ips[chain->kernel-2];
+ }
}
dprintf(" ... thread: %s:%d\n", thread->comm, thread->pid);
@@ -1343,6 +1353,8 @@ static const struct option options[] = {
"sort by key(s): pid, comm, dso, symbol. Default: pid,symbol"),
OPT_BOOLEAN('P', "full-paths", &full_paths,
"Don't shorten the pathnames taking into account the cwd"),
+ OPT_BOOLEAN('S', "syscalls", &collapse_syscalls,
+ "show per syscall summary overhead, using call graph"),
OPT_END()
};