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From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Tzvetomir Stoyanov <tstoyanov@vmware.com>
Subject: Re: [PATCH 8/9] tools/lib/traceevent: Introduce new libtracevent API: tep_override_comm()
Date: Tue, 8 Jan 2019 10:35:36 -0300
Message-ID: <20190108133536.GD28965@kernel.org> (raw)
In-Reply-To: <20181130154648.038915912@goodmis.org>

Em Fri, Nov 30, 2018 at 10:44:11AM -0500, Steven Rostedt escreveu:
> From: Tzvetomir Stoyanov <tstoyanov@vmware.com>
> 
> This patch adds a new API of tracevent library: tep_override_comm()
> It registers a pid / command mapping. If a mapping with the same
> pid already exists, the entry is updated with the new command.

This one had fell thru the cracks, noticed that while processing the
following patchkit, now its in and I'm processing the last one.

- Arnaldo
 
> Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> ---
>  tools/lib/traceevent/event-parse.c | 69 +++++++++++++++++++++++-------
>  tools/lib/traceevent/event-parse.h |  1 +
>  2 files changed, 55 insertions(+), 15 deletions(-)
> 
> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> index 8863de9f8869..892cf032a096 100644
> --- a/tools/lib/traceevent/event-parse.c
> +++ b/tools/lib/traceevent/event-parse.c
> @@ -232,11 +232,13 @@ int tep_pid_is_registered(struct tep_handle *pevent, int pid)
>   * we must add this pid. This is much slower than when cmdlines
>   * are added before the array is initialized.
>   */
> -static int add_new_comm(struct tep_handle *pevent, const char *comm, int pid)
> +static int add_new_comm(struct tep_handle *pevent,
> +			const char *comm, int pid, bool override)
>  {
>  	struct cmdline *cmdlines = pevent->cmdlines;
> -	const struct cmdline *cmdline;
> +	struct cmdline *cmdline;
>  	struct cmdline key;
> +	char *new_comm;
>  
>  	if (!pid)
>  		return 0;
> @@ -247,8 +249,19 @@ static int add_new_comm(struct tep_handle *pevent, const char *comm, int pid)
>  	cmdline = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
>  		       sizeof(*pevent->cmdlines), cmdline_cmp);
>  	if (cmdline) {
> -		errno = EEXIST;
> -		return -1;
> +		if (!override) {
> +			errno = EEXIST;
> +			return -1;
> +		}
> +		new_comm = strdup(comm);
> +		if (!new_comm) {
> +			errno = ENOMEM;
> +			return -1;
> +		}
> +		free(cmdline->comm);
> +		cmdline->comm = new_comm;
> +
> +		return 0;
>  	}
>  
>  	cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (pevent->cmdline_count + 1));
> @@ -275,21 +288,13 @@ static int add_new_comm(struct tep_handle *pevent, const char *comm, int pid)
>  	return 0;
>  }
>  
> -/**
> - * tep_register_comm - register a pid / comm mapping
> - * @pevent: handle for the pevent
> - * @comm: the command line to register
> - * @pid: the pid to map the command line to
> - *
> - * This adds a mapping to search for command line names with
> - * a given pid. The comm is duplicated.
> - */
> -int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid)
> +static int _tep_register_comm(struct tep_handle *pevent,
> +			      const char *comm, int pid, bool override)
>  {
>  	struct cmdline_list *item;
>  
>  	if (pevent->cmdlines)
> -		return add_new_comm(pevent, comm, pid);
> +		return add_new_comm(pevent, comm, pid, override);
>  
>  	item = malloc(sizeof(*item));
>  	if (!item)
> @@ -312,6 +317,40 @@ int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid)
>  	return 0;
>  }
>  
> +/**
> + * tep_register_comm - register a pid / comm mapping
> + * @pevent: handle for the pevent
> + * @comm: the command line to register
> + * @pid: the pid to map the command line to
> + *
> + * This adds a mapping to search for command line names with
> + * a given pid. The comm is duplicated. If a command with the same pid
> + * already exist, -1 is returned and errno is set to EEXIST
> + */
> +int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid)
> +{
> +	return _tep_register_comm(pevent, comm, pid, false);
> +}
> +
> +/**
> + * tep_override_comm - register a pid / comm mapping
> + * @pevent: handle for the pevent
> + * @comm: the command line to register
> + * @pid: the pid to map the command line to
> + *
> + * This adds a mapping to search for command line names with
> + * a given pid. The comm is duplicated. If a command with the same pid
> + * already exist, the command string is udapted with the new one
> + */
> +int tep_override_comm(struct tep_handle *pevent, const char *comm, int pid)
> +{
> +	if (!pevent->cmdlines && cmdline_init(pevent)) {
> +		errno = ENOMEM;
> +		return -1;
> +	}
> +	return _tep_register_comm(pevent, comm, pid, true);
> +}
> +
>  int tep_register_trace_clock(struct tep_handle *pevent, const char *trace_clock)
>  {
>  	pevent->trace_clock = strdup(trace_clock);
> diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
> index 35d37087d3c5..e6f4249910e6 100644
> --- a/tools/lib/traceevent/event-parse.h
> +++ b/tools/lib/traceevent/event-parse.h
> @@ -432,6 +432,7 @@ int tep_set_function_resolver(struct tep_handle *pevent,
>  			      tep_func_resolver_t *func, void *priv);
>  void tep_reset_function_resolver(struct tep_handle *pevent);
>  int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid);
> +int tep_override_comm(struct tep_handle *pevent, const char *comm, int pid);
>  int tep_register_trace_clock(struct tep_handle *pevent, const char *trace_clock);
>  int tep_register_function(struct tep_handle *pevent, char *name,
>  			  unsigned long long addr, char *mod);
> -- 
> 2.19.1
> 

-- 

- Arnaldo

  reply index

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-30 15:44 [PATCH 0/9] tools/lib/traceevent: More udpates to make libtraceevent into a library Steven Rostedt
2018-11-30 15:44 ` [PATCH 1/9] tools/lib/traceevent: Implemented new API tep_get_ref() Steven Rostedt
2018-12-14 20:34   ` [tip:perf/core] tools lib traceevent: Implement " tip-bot for Tzvetomir Stoyanov
2018-12-18 14:01   ` tip-bot for Tzvetomir Stoyanov
2018-11-30 15:44 ` [PATCH 2/9] tools/lib/traceevent: Added support for pkg-config Steven Rostedt
2018-12-04  7:32   ` Namhyung Kim
2018-12-04  8:51     ` Tzvetomir Stoyanov
2018-12-04 17:27     ` Steven Rostedt
2018-12-14 20:34   ` [tip:perf/core] tools lib traceevent: " tip-bot for Tzvetomir Stoyanov
2018-12-18 14:01   ` tip-bot for Tzvetomir Stoyanov
2018-11-30 15:44 ` [PATCH 3/9] tools/lib/traceevent: Install trace-seq.h API header file Steven Rostedt
2018-12-04  7:47   ` Namhyung Kim
2018-12-04 19:41     ` Steven Rostedt
2018-12-05 12:25       ` Jiri Olsa
2018-12-05 17:03         ` Steven Rostedt
2018-12-05 17:22           ` Jiri Olsa
2018-12-14 20:35   ` [tip:perf/core] tools lib traceevent: " tip-bot for Tzvetomir Stoyanov
2018-12-18 14:02   ` tip-bot for Tzvetomir Stoyanov
2018-11-30 15:44 ` [PATCH 4/9] tools/lib/traceevent, tools/perf: Rename struct tep_event_format to struct tep_event Steven Rostedt
2018-12-14 20:36   ` [tip:perf/core] tools lib traceevent, perf tools: Rename 'struct tep_event_format' to 'struct tep_event' tip-bot for Tzvetomir Stoyanov
2018-12-18 14:02   ` tip-bot for Tzvetomir Stoyanov
2018-11-30 15:44 ` [PATCH 5/9] tools/lib/traceevent: Rename tep_free_format() to tep_free_event() Steven Rostedt
2018-12-14 20:36   ` [tip:perf/core] tools lib traceevent: " tip-bot for Tzvetomir Stoyanov
2018-12-18 14:03   ` tip-bot for Tzvetomir Stoyanov
2018-11-30 15:44 ` [PATCH 6/9] tools/perf: traceevent API cleanup, remove __tep_data2host*() Steven Rostedt
2018-12-14 20:37   ` [tip:perf/core] perf tools: " tip-bot for Tzvetomir Stoyanov
2018-12-18 14:04   ` tip-bot for Tzvetomir Stoyanov
2018-11-30 15:44 ` [PATCH 7/9] tools/lib/traceevent: traceevent API cleanup Steven Rostedt
2018-11-30 19:18   ` Arnaldo Carvalho de Melo
2018-11-30 19:37     ` Steven Rostedt
2018-11-30 19:55       ` Arnaldo Carvalho de Melo
2018-11-30 19:57       ` Steven Rostedt
2018-11-30 20:09     ` Steven Rostedt
2018-11-30 20:16       ` Arnaldo Carvalho de Melo
2018-12-03 10:42         ` Arnaldo Carvalho de Melo
2018-12-14 20:37   ` [tip:perf/core] tools lib traceevent: " tip-bot for Tzvetomir Stoyanov
2018-12-18 14:04   ` tip-bot for Tzvetomir Stoyanov
2018-11-30 15:44 ` [PATCH 8/9] tools/lib/traceevent: Introduce new libtracevent API: tep_override_comm() Steven Rostedt
2019-01-08 13:35   ` Arnaldo Carvalho de Melo [this message]
2019-01-09  7:12   ` [tip:perf/urgent] tools lib traceevent: " tip-bot for Tzvetomir Stoyanov
2018-11-30 15:44 ` [PATCH 9/9] tools/lib/traceevent: Add sanity check to is_timestamp_in_us() Steven Rostedt

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