perf report: Add support for profiling JIT generated code
This patch adds support for profiling JIT generated code to 'perf
report'. A JIT compiler is required to generate a "/tmp/perf-$PID.map"
symbols map that is parsed when looking and displaying symbols.
Thanks to Peter Zijlstra for his help with this patch!
Example "perf report" output with the Jato JIT:
#
# (40311 samples)
#
# Overhead Command Shared Object Symbol
# ........ ................ ......................... ......
#
97.80% jato /tmp/perf-11915.map [.] Fibonacci.fib(I)I
0.56% jato 00000000b7fa023b 0x000000b7fa023b
0.45% jato /tmp/perf-11915.map [.] Fibonacci.main([Ljava/lang/String;)V
0.38% jato [kernel] [k] get_page_from_freelist
0.06% jato [kernel] [k] kunmap_atomic
0.05% jato ./jato [.] utf8Hash
0.04% jato ./jato [.] executeJava
0.04% jato ./jato [.] defineClass
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: a.p.zijlstra@chello.nl
Cc: acme@redhat.com
LKML-Reference: <Pine.LNX.4.64.0906082111590.12407@melkki.cs.Helsinki.FI>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index f053a74..61d8718 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -209,6 +209,11 @@
return ip;
}
+static inline int is_anon_memory(const char *filename)
+{
+ return strcmp(filename, "//anon") == 0;
+}
+
static struct map *map__new(struct mmap_event *event)
{
struct map *self = malloc(sizeof(*self));
@@ -216,6 +221,7 @@
if (self != NULL) {
const char *filename = event->filename;
char newfilename[PATH_MAX];
+ int anon;
if (cwd) {
int n = strcommon(filename);
@@ -227,6 +233,13 @@
}
}
+ anon = is_anon_memory(filename);
+
+ if (anon) {
+ snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", event->pid);
+ filename = newfilename;
+ }
+
self->start = event->start;
self->end = event->start + event->len;
self->pgoff = event->pgoff;
@@ -235,7 +248,7 @@
if (self->dso == NULL)
goto out_delete;
- if (self->dso == vdso)
+ if (self->dso == vdso || anon)
self->map_ip = vdso__map_ip;
else
self->map_ip = map__map_ip;