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authorDavid Ahern <dsahern@gmail.com>2012-07-20 17:25:49 -0600
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-07-25 11:30:13 -0300
commitadb5d2a487c55e5ca2ecc0b73c8f592e95d292c7 (patch)
tree7d479665da86eb90560e6838a8e6536e99b8fdba /tools
parent7c0f4a4113ba5de7898c246eeaeee4c23d94b887 (diff)
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perf kvm: Fix bug resolving guest kernel syms
Guest kernel symbols are not resolved despite passing the information needed to resolve them. e.g., perf kvm --guest --guestmount=/tmp/guest-mount record -a -- sleep 1 perf kvm --guest --guestmount=/tmp/guest-mount report --stdio 36.55% [guest/11399] [unknown] [g] 0xffffffff81600bc8 33.19% [guest/10474] [unknown] [g] 0x00000000c0116e00 30.26% [guest/11094] [unknown] [g] 0xffffffff8100a288 43.69% [guest/10474] [unknown] [g] 0x00000000c0103d90 37.38% [guest/11399] [unknown] [g] 0xffffffff81600bc8 12.24% [guest/11094] [unknown] [g] 0xffffffff810aa91d 6.69% [guest/11094] [unknown] [u] 0x00007fa784d721c3 which is just pathetic. After a maddening 2 days sifting through perf minutia I found it -- id_hdr_size is not initialized for guest machines. This shows up on the report side as random garbage for the cpu and timestamp, e.g., 29816 7310572949125804849 0x1ac0 [0x50]: PERF_RECORD_MMAP ... That messes up the sample sorting such that synthesized guest maps are processed last. With this patch you get a much more helpful report: 12.11% [guest/11399] [guest.kernel.kallsyms.11399] [g] irqtime_account_process_tick 10.58% [guest/11399] [guest.kernel.kallsyms.11399] [g] run_timer_softirq 6.95% [guest/11094] [guest.kernel.kallsyms.11094] [g] printk_needs_cpu 6.50% [guest/11094] [guest.kernel.kallsyms.11094] [g] do_timer 6.45% [guest/11399] [guest.kernel.kallsyms.11399] [g] idle_balance 4.90% [guest/11094] [guest.kernel.kallsyms.11094] [g] native_read_tsc ... v2: - changed rbtree walk to use rb_first per Namhyung's suggestion Tested-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1342826756-64663-5-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/map.c13
-rw-r--r--tools/perf/util/map.h1
-rw-r--r--tools/perf/util/session.c1
3 files changed, 15 insertions, 0 deletions
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 8668569d4b2a..16d783d322b6 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -729,3 +729,16 @@ char *machine__mmap_name(struct machine *self, char *bf, size_t size)
return bf;
}
+
+void machines__set_id_hdr_size(struct rb_root *machines, u16 id_hdr_size)
+{
+ struct rb_node *node;
+ struct machine *machine;
+
+ for (node = rb_first(machines); node; node = rb_next(node)) {
+ machine = rb_entry(node, struct machine, rb_node);
+ machine->id_hdr_size = id_hdr_size;
+ }
+
+ return;
+}
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index c14c665d9a25..03a1e9b08b21 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -151,6 +151,7 @@ struct machine *machines__add(struct rb_root *self, pid_t pid,
struct machine *machines__find_host(struct rb_root *self);
struct machine *machines__find(struct rb_root *self, pid_t pid);
struct machine *machines__findnew(struct rb_root *self, pid_t pid);
+void machines__set_id_hdr_size(struct rb_root *self, u16 id_hdr_size);
char *machine__mmap_name(struct machine *self, char *bf, size_t size);
int machine__init(struct machine *self, const char *root_dir, pid_t pid);
void machine__exit(struct machine *self);
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 90ee39dd8ab2..8e4f0755d2aa 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -87,6 +87,7 @@ void perf_session__update_sample_type(struct perf_session *self)
self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
self->id_hdr_size = perf_evlist__id_hdr_size(self->evlist);
self->host_machine.id_hdr_size = self->id_hdr_size;
+ machines__set_id_hdr_size(&self->machines, self->id_hdr_size);
}
int perf_session__create_kernel_maps(struct perf_session *self)