linux-kernel - Re: [PATCH v7 5/8] perf tool: add print support for namespace events

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Date:   Wed, 1 Mar 2017 18:06:49 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Hari Bathini <hbathini@...ux.vnet.ibm.com>
Cc:     ast@...com, peterz@...radead.org,
        lkml <linux-kernel@...r.kernel.org>,
        alexander.shishkin@...ux.intel.com, mingo@...hat.com,
        daniel@...earbox.net, rostedt@...dmis.org,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
        ebiederm@...ssion.com, sargun@...gun.me,
        Aravinda Prasad <aravinda@...ux.vnet.ibm.com>,
        brendan.d.gregg@...il.com, jolsa@...hat.com
Subject: Re: [PATCH v7 5/8] perf tool: add print support for namespace events

Em Tue, Feb 21, 2017 at 07:31:52PM +0530, Hari Bathini escreveu:
> +++ b/tools/perf/util/event.c
> @@ -1104,6 +1104,33 @@ size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
>  	return fprintf(fp, "%s: %s:%d/%d\n", s, event->comm.comm, event->comm.pid, event->comm.tid);
>  }
>  
> +size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp)
> +{
> +	size_t ret = 0;
> +	struct perf_ns_link_info *ns_link_info;
> +	u32 nr_namespaces, idx;
> +
> +	ns_link_info = event->namespaces.link_info;
> +	nr_namespaces = event->namespaces.nr_namespaces;

Perfect, no magic numbers here. :-)

- Arnaldo

> +	ret += fprintf(fp, " %d/%d - nr_namespaces: %u\n\t[",
> +		       event->namespaces.pid,
> +		       event->namespaces.tid,
> +		       nr_namespaces);
> +
> +	for (idx = 0; idx < nr_namespaces; idx++) {
> +		if (idx && (idx % 4 == 0))
> +			ret += fprintf(fp, "\n\t ");
> +
> +		ret  += fprintf(fp, "%u/%s: %lu/0x%lx%s", idx,
> +				perf_ns__name(idx), (u64)ns_link_info[idx].dev,
> +				(u64)ns_link_info[idx].ino,
> +				((idx + 1) != nr_namespaces) ? ", " : "]\n\n");
> +	}
> +
> +	return ret;
> +}
> +
>  int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
>  			     union perf_event *event,
>  			     struct perf_sample *sample,
> @@ -1300,6 +1327,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp)
>  	case PERF_RECORD_MMAP:
>  		ret += perf_event__fprintf_mmap(event, fp);
>  		break;
> +	case PERF_RECORD_NAMESPACES:
> +		ret += perf_event__fprintf_namespaces(event, fp);
> +		break;
>  	case PERF_RECORD_MMAP2:
>  		ret += perf_event__fprintf_mmap2(event, fp);
>  		break;
> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
> index c73ad47..8eb470b 100644
> --- a/tools/perf/util/event.h
> +++ b/tools/perf/util/event.h
> @@ -673,6 +673,7 @@ size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp);
>  size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp);
>  size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
>  size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
> +size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp);
>  size_t perf_event__fprintf(union perf_event *event, FILE *fp);
>  
>  u64 kallsyms__get_function_start(const char *kallsyms_filename,
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index 060fabb..5f46ad0 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -519,6 +519,9 @@ int machine__process_namespaces_event(struct machine *machine __maybe_unused,
>  		  "\nWARNING: perf tool seems to support more namespaces than"
>  		  " the kernel.\nTry updating the kernel..\n\n");
>  
> +	if (dump_trace)
> +		perf_event__fprintf_namespaces(event, stdout);
> +
>  	if (thread == NULL ||
>  	    thread__set_namespaces(thread, sample->time, &event->namespaces)) {
>  		dump_printf("problem processing PERF_RECORD_NAMESPACES, skipping event.\n");