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Date: Tue, 17 Sep 2013 10:46:09 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Frederic Weisbecker <fweisbec@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>, Jiri Olsa <jolsa@...hat.com>,
David Ahern <dsahern@...il.com>, Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 4/4] perf tools: Compare hists comm by addresses
Hi Frederic,
On Fri, 13 Sep 2013 15:59:49 +0200, Frederic Weisbecker wrote:
> On Fri, Sep 13, 2013 at 05:07:06PM +0900, Namhyung Kim wrote:
[SNIP]
>> --- a/tools/perf/util/sort.c
>> +++ b/tools/perf/util/sort.c
>> @@ -1,5 +1,6 @@
>> #include "sort.h"
>> #include "hist.h"
>> +#include "comm.h"
>> #include "symbol.h"
>>
>> regex_t parent_regex;
>> @@ -80,14 +81,14 @@ static int64_t
>> sort__comm_cmp(struct hist_entry *left, struct hist_entry *right)
>> {
>> /* Compare the addr that should be unique among comm */
>> - return thread__comm_curr(right->thread) - thread__comm_curr(left->thread);
>> + return comm__str(right->comm) - comm__str(left->comm);
>
>
> If comm and fork events don't have a timestamp, or they aren't time ordered, we should
> override the comm entry of a thread and forget the previous one.
>
> So perhaps what we should do instead is to compare "struct comm" addresses directly.
> But it means that on thread__set_comm(), if we override the old entry due to missing or
> unordered timestamps (in which case we need to force them to be 0), we shouldn't reallocate
> a new struct comm, nor should we keep the old one and queue a new. Instead we need to override
> list_first_entry(thread->comm)->comm_str pointer only to make it point to a new struct comm_str.
Okay. Here's a revised patch:
>From 599221323f8fc0fd3327190900fece6c2aaa7309 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@....com>
Date: Fri, 13 Sep 2013 16:28:57 +0900
Subject: [PATCH] perf tools: Get current comm instead of last one
At insert time, a hist entry should reference comm at the time
otherwise it'll get the last comm anyway.
Cc: Frederic Weisbecker <fweisbec@...il.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/perf/util/comm.c | 15 +++++++++++++++
tools/perf/util/comm.h | 1 +
tools/perf/util/hist.c | 3 +++
tools/perf/util/sort.c | 14 +++++---------
tools/perf/util/sort.h | 1 +
tools/perf/util/thread.c | 6 +++---
tools/perf/util/thread.h | 2 ++
7 files changed, 30 insertions(+), 12 deletions(-)
diff --git a/tools/perf/util/comm.c b/tools/perf/util/comm.c
index 87f4a10e4a23..2d0f94f6593e 100644
--- a/tools/perf/util/comm.c
+++ b/tools/perf/util/comm.c
@@ -95,6 +95,21 @@ struct comm *comm__new(const char *str, u64 timestamp)
return self;
}
+void comm__override(struct comm *comm, const char *str, u64 timestamp)
+{
+ struct comm_str *old = comm->comm_str;
+
+ comm->comm_str = comm_str_findnew(str, &comm_str_root);
+ if (!comm->comm_str) {
+ comm->comm_str = old;
+ return;
+ }
+
+ comm->start = timestamp;
+ comm_str_get(comm->comm_str);
+ comm_str_put(old);
+}
+
void comm__free(struct comm *self)
{
comm_str_put(self->comm_str);
diff --git a/tools/perf/util/comm.h b/tools/perf/util/comm.h
index 2e47fb7e27de..d37c2898e665 100644
--- a/tools/perf/util/comm.h
+++ b/tools/perf/util/comm.h
@@ -16,5 +16,6 @@ struct comm {
void comm__free(struct comm *self);
struct comm *comm__new(const char *str, u64 timestamp);
const char *comm__str(struct comm *self);
+void comm__override(struct comm *self, const char *str, u64 timestamp);
#endif /* __PERF_COMM_H */
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 1f5767f97dce..1fe90bd9dcb7 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -412,6 +412,7 @@ struct hist_entry *__hists__add_mem_entry(struct hists *self,
{
struct hist_entry entry = {
.thread = al->thread,
+ .comm = curr_comm(al->thread),
.ms = {
.map = al->map,
.sym = al->sym,
@@ -442,6 +443,7 @@ struct hist_entry *__hists__add_branch_entry(struct hists *self,
{
struct hist_entry entry = {
.thread = al->thread,
+ .comm = curr_comm(al->thread),
.ms = {
.map = bi->to.map,
.sym = bi->to.sym,
@@ -471,6 +473,7 @@ struct hist_entry *__hists__add_entry(struct hists *self,
{
struct hist_entry entry = {
.thread = al->thread,
+ .comm = curr_comm(al->thread),
.ms = {
.map = al->map,
.sym = al->sym,
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 3b307e740d6e..65f10784d2dc 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -1,5 +1,6 @@
#include "sort.h"
#include "hist.h"
+#include "comm.h"
#include "symbol.h"
regex_t parent_regex;
@@ -80,25 +81,20 @@ static int64_t
sort__comm_cmp(struct hist_entry *left, struct hist_entry *right)
{
/* Compare the addr that should be unique among comm */
- return thread__comm_curr(right->thread) - thread__comm_curr(left->thread);
+ return comm__str(right->comm) - comm__str(left->comm);
}
static int64_t
sort__comm_collapse(struct hist_entry *left, struct hist_entry *right)
{
- const char *comm_l = thread__comm_curr(left->thread);
- const char *comm_r = thread__comm_curr(right->thread);
-
- if (!comm_l || !comm_r)
- return cmp_null(comm_l, comm_r);
-
- return strcmp(comm_l, comm_r);
+ /* Compare the addr that should be unique among comm */
+ return comm__str(right->comm) - comm__str(left->comm);
}
static int hist_entry__comm_snprintf(struct hist_entry *self, char *bf,
size_t size, unsigned int width)
{
- return repsep_snprintf(bf, size, "%*s", width, thread__comm_curr(self->thread));
+ return repsep_snprintf(bf, size, "%*s", width, comm__str(self->comm));
}
struct sort_entry sort_comm = {
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index 4e80dbd271e7..4d0153f83e3c 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -84,6 +84,7 @@ struct hist_entry {
struct he_stat stat;
struct map_symbol ms;
struct thread *thread;
+ struct comm *comm;
u64 ip;
s32 cpu;
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index d3ca133329b2..00caed1abb5f 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -54,7 +54,7 @@ void thread__delete(struct thread *self)
free(self);
}
-static struct comm *curr_comm(const struct thread *self)
+struct comm *curr_comm(const struct thread *self)
{
if (list_empty(&self->comm_list))
return NULL;
@@ -69,8 +69,8 @@ int thread__set_comm(struct thread *self, const char *str, u64 timestamp)
/* Override latest entry if it had no specific time coverage */
if (!curr->start) {
- list_del(&curr->list);
- comm__free(curr);
+ comm__override(curr, str, timestamp);
+ return 0;
}
new = comm__new(str, timestamp);
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 1d9378abb515..cf8e31d0028b 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -26,6 +26,7 @@ struct thread {
};
struct machine;
+struct comm;
struct thread *thread__new(pid_t pid, pid_t tid);
void thread__delete(struct thread *self);
@@ -36,6 +37,7 @@ static inline void thread__exited(struct thread *thread)
int thread__set_comm(struct thread *self, const char *comm, u64 timestamp);
int thread__comm_len(struct thread *self);
+struct comm *curr_comm(const struct thread *self);
const char *thread__comm_curr(const struct thread *self);
void thread__insert_map(struct thread *self, struct map *map);
int thread__fork(struct thread *self, struct thread *parent, u64 timestamp);
--
1.7.11.7
--
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