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Date:	Mon, 14 Jul 2014 17:32:37 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 05/41] perf tools: Identify which comms are from exec

Em Mon, Jul 14, 2014 at 01:02:29PM +0300, Adrian Hunter escreveu:
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/util/comm.c    |  7 +++++--
>  tools/perf/util/comm.h    |  6 ++++--
>  tools/perf/util/machine.c |  4 +++-
>  tools/perf/util/thread.c  | 24 +++++++++++++++++++-----
>  tools/perf/util/thread.h  | 10 +++++++++-
>  5 files changed, 40 insertions(+), 11 deletions(-)
> 
> diff --git a/tools/perf/util/comm.c b/tools/perf/util/comm.c
> index f9e7776..5e1e80e 100644
> --- a/tools/perf/util/comm.c
> +++ b/tools/perf/util/comm.c
> @@ -74,7 +74,7 @@ static struct comm_str *comm_str__findnew(const char *str, struct rb_root *root)
>  	return new;
>  }
>  
> -struct comm *comm__new(const char *str, u64 timestamp)
> +struct comm *comm__new(const char *str, u64 timestamp, bool exec)
>  {
>  	struct comm *comm = zalloc(sizeof(*comm));
>  
> @@ -82,6 +82,7 @@ struct comm *comm__new(const char *str, u64 timestamp)
>  		return NULL;
>  
>  	comm->start = timestamp;
> +	comm->exec = exec;
>  
>  	comm->comm_str = comm_str__findnew(str, &comm_str_root);
>  	if (!comm->comm_str) {
> @@ -94,7 +95,7 @@ struct comm *comm__new(const char *str, u64 timestamp)
>  	return comm;
>  }
>  
> -int comm__override(struct comm *comm, const char *str, u64 timestamp)
> +int comm__override(struct comm *comm, const char *str, u64 timestamp, bool exec)
>  {
>  	struct comm_str *new, *old = comm->comm_str;
>  
> @@ -106,6 +107,8 @@ int comm__override(struct comm *comm, const char *str, u64 timestamp)
>  	comm_str__put(old);
>  	comm->comm_str = new;
>  	comm->start = timestamp;
> +	if (exec && !comm->exec)
> +		comm->exec = true;

Why do you need the !comm->exec test?

>  	return 0;
>  }
> diff --git a/tools/perf/util/comm.h b/tools/perf/util/comm.h
> index fac5bd5..51c10ab 100644
> --- a/tools/perf/util/comm.h
> +++ b/tools/perf/util/comm.h
> @@ -11,11 +11,13 @@ struct comm {
>  	struct comm_str *comm_str;
>  	u64 start;
>  	struct list_head list;
> +	bool exec;
>  };
>  
>  void comm__free(struct comm *comm);
> -struct comm *comm__new(const char *str, u64 timestamp);
> +struct comm *comm__new(const char *str, u64 timestamp, bool exec);
>  const char *comm__str(const struct comm *comm);
> -int comm__override(struct comm *comm, const char *str, u64 timestamp);
> +int comm__override(struct comm *comm, const char *str, u64 timestamp,
> +		   bool exec);
>  
>  #endif  /* __PERF_COMM_H */
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index 0fa93c1..2513204 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -360,11 +360,13 @@ int machine__process_comm_event(struct machine *machine, union perf_event *event
>  	struct thread *thread = machine__findnew_thread(machine,
>  							event->comm.pid,
>  							event->comm.tid);
> +	bool exec = event->header.misc & PERF_RECORD_MISC_COMM_EXEC;
>  
>  	if (dump_trace)
>  		perf_event__fprintf_comm(event, stdout);
>  
> -	if (thread == NULL || thread__set_comm(thread, event->comm.comm, sample->time)) {
> +	if (thread == NULL ||
> +	    __thread__set_comm(thread, event->comm.comm, sample->time, exec)) {
>  		dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
>  		return -1;
>  	}
> diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
> index ca94295..149e417 100644
> --- a/tools/perf/util/thread.c
> +++ b/tools/perf/util/thread.c
> @@ -76,7 +76,7 @@ struct thread *thread__new(pid_t pid, pid_t tid)
>  			goto err_thread;
>  
>  		snprintf(comm_str, 32, ":%d", tid);
> -		comm = comm__new(comm_str, 0);
> +		comm = comm__new(comm_str, 0, false);
>  		free(comm_str);
>  		if (!comm)
>  			goto err_thread;
> @@ -113,19 +113,33 @@ struct comm *thread__comm(const struct thread *thread)
>  	return list_first_entry(&thread->comm_list, struct comm, list);
>  }
>  
> +struct comm *thread__exec_comm(const struct thread *thread)
> +{
> +	struct comm *comm, *last = NULL;
> +
> +	list_for_each_entry(comm, &thread->comm_list, list) {
> +		if (comm->exec)
> +			return comm;
> +		last = comm;
> +	}
> +
> +	return last;
> +}
> +
>  /* CHECKME: time should always be 0 if event aren't ordered */
> -int thread__set_comm(struct thread *thread, const char *str, u64 timestamp)
> +int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
> +		       bool exec)
>  {
>  	struct comm *new, *curr = thread__comm(thread);
>  	int err;
>  
>  	/* Override latest entry if it had no specific time coverage */
> -	if (!curr->start) {
> -		err = comm__override(curr, str, timestamp);
> +	if (!curr->start && !curr->exec) {
> +		err = comm__override(curr, str, timestamp, exec);
>  		if (err)
>  			return err;
>  	} else {
> -		new = comm__new(str, timestamp);
> +		new = comm__new(str, timestamp, exec);
>  		if (!new)
>  			return -ENOMEM;
>  		list_add(&new->list, &thread->comm_list);
> diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
> index 9de0629..b4269af 100644
> --- a/tools/perf/util/thread.h
> +++ b/tools/perf/util/thread.h
> @@ -38,9 +38,17 @@ static inline void thread__exited(struct thread *thread)
>  	thread->dead = true;
>  }
>  
> -int thread__set_comm(struct thread *thread, const char *comm, u64 timestamp);
> +int __thread__set_comm(struct thread *thread, const char *comm, u64 timestamp,
> +		       bool exec);
> +static inline int thread__set_comm(struct thread *thread, const char *comm,
> +				   u64 timestamp)
> +{
> +	return __thread__set_comm(thread, comm, timestamp, false);
> +}
> +

So this is nice, you leave the existing function, setting exec to false,
so that you don't have to change the existing codepaths where it is not
from 'exec', and provide a __ prefixed variant where 'exec' can be set.

Why not to do the same thing for comm__new() ? No uses, i.e. in all
cases you will need to pass 'exec' as a variable?

I thought about doing the same thing for that machine__findnew_thread,
i.e. provide a variant where tid and pid is passed and one where just
the tid is passed, because the pid is unknown.

BTW, I'll update my perf/core branch with the set of patches that I
merged, so that you can have where to look for a consolidated tree with
the things already processed.

- Arnaldo

>  int thread__comm_len(struct thread *thread);
>  struct comm *thread__comm(const struct thread *thread);
> +struct comm *thread__exec_comm(const struct thread *thread);
>  const char *thread__comm_str(const struct thread *thread);
>  void thread__insert_map(struct thread *thread, struct map *map);
>  int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp);
> -- 
> 1.8.3.2
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