linux-kernel - Re: [PATCH v4 03/15] perf tools script: Filter COMM/FORK/.. events by CPU

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Date:   Wed, 6 Mar 2019 16:23:40 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Andi Kleen <andi@...stfloor.org>, acme@...nel.org
Cc:     jolsa@...nel.org, namhyung@...nel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v4 03/15] perf tools script: Filter COMM/FORK/.. events by
 CPU

On 5/03/19 4:47 PM, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> The --cpu option only filtered samples. Filter other perf events,
> such as COMM, FORK, SWITCH by the CPU too.

Because tasks can migrate from cpu to cpu, we probably need to process most
of the events anyway, even if they are not printed.

> 
> Reported-by: Jiri Olsa <jolsa@...nel.org>
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/builtin-script.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index fbc440bdf880..3813f60d1dc0 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -2038,6 +2038,9 @@ static int process_comm_event(struct perf_tool *tool,
>  	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);
>  	int ret = -1;
>  
> +	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
> +		return 0;
> +
>  	thread = machine__findnew_thread(machine, event->comm.pid, event->comm.tid);
>  	if (thread == NULL) {
>  		pr_debug("problem processing COMM event, skipping it.\n");
> @@ -2073,6 +2076,9 @@ static int process_namespaces_event(struct perf_tool *tool,
>  	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);
>  	int ret = -1;
>  
> +	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
> +		return 0;
> +
>  	thread = machine__findnew_thread(machine, event->namespaces.pid,
>  					 event->namespaces.tid);
>  	if (thread == NULL) {
> @@ -2108,6 +2114,9 @@ static int process_fork_event(struct perf_tool *tool,
>  	struct perf_session *session = script->session;
>  	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);
>  
> +	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
> +		return 0;
> +
>  	if (perf_event__process_fork(tool, event, sample, machine) < 0)
>  		return -1;
>  
> @@ -2141,6 +2150,9 @@ static int process_exit_event(struct perf_tool *tool,
>  	struct perf_session *session = script->session;
>  	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);
>  
> +	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
> +		return 0;
> +
>  	thread = machine__findnew_thread(machine, event->fork.pid, event->fork.tid);
>  	if (thread == NULL) {
>  		pr_debug("problem processing EXIT event, skipping it.\n");
> @@ -2174,6 +2186,9 @@ static int process_mmap_event(struct perf_tool *tool,
>  	struct perf_session *session = script->session;
>  	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);
>  
> +	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
> +		return 0;
> +
>  	if (perf_event__process_mmap(tool, event, sample, machine) < 0)
>  		return -1;
>  
> @@ -2206,6 +2221,9 @@ static int process_mmap2_event(struct perf_tool *tool,
>  	struct perf_session *session = script->session;
>  	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);
>  
> +	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
> +		return 0;
> +
>  	if (perf_event__process_mmap2(tool, event, sample, machine) < 0)
>  		return -1;
>  
> @@ -2238,6 +2256,9 @@ static int process_switch_event(struct perf_tool *tool,
>  	struct perf_session *session = script->session;
>  	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);
>  
> +	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
> +		return 0;
> +
>  	if (perf_event__process_switch(tool, event, sample, machine) < 0)
>  		return -1;
>  
> @@ -2266,6 +2287,9 @@ process_lost_event(struct perf_tool *tool,
>  	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);
>  	struct thread *thread;
>  
> +	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
> +		return 0;
> +
>  	thread = machine__findnew_thread(machine, sample->pid,
>  					 sample->tid);
>  	if (thread == NULL)
>