linux-kernel - Re: [PATCH] perf: Speed up thread map generation

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Date:	Fri, 14 Mar 2014 14:17:35 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Don Zickus <dzickus@...hat.com>
Cc:	acme@...hat.com, jmario@...hat.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf: Speed up thread map generation

On Thu, Mar 13, 2014 at 05:16:37PM -0400, Don Zickus wrote:

SNIP

> +	event->fork.ptid = tgid;
> +	event->fork.pid  = tgid;
> +	event->fork.tid  = pid;
> +	event->fork.header.type = PERF_RECORD_FORK;
> +
> +	event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
> +
> +	if (process(tool, event, &synth_sample, machine) != 0)
> +		return -1;
> +
> +	return 0;
> +}
> +
>  int perf_event__synthesize_mmap_events(struct perf_tool *tool,
>  				       union perf_event *event,
>  				       pid_t pid, pid_t tgid,
> @@ -287,6 +309,11 @@ static int __event__synthesize_thread(union perf_event *comm_event,
>  	DIR *tasks;
>  	struct dirent dirent, *next;
>  	pid_t tgid;
> +	union perf_event *fork_event;
> +
> +	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
> +	if (fork_event == NULL)
> +		return -1;

need to be freed

maybe we could move the allocation one level up,
same as for mmap_event and comm_event

otherwise I think the logic with FORK event is correct

jirka
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