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Date: Fri, 5 Jul 2013 13:59:33 -0300
From: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
Namhyung Kim <namhyung@...il.com>,
Paul Mackerras <paulus@...ba.org>,
Peter Zijlstra <peterz@...radead.org>,
Stephane Eranian <eranian@...gle.com>,
Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH V4 09/21] perf tools: add debug prints
Em Thu, Jul 04, 2013 at 04:20:28PM +0300, Adrian Hunter escreveu:
> It is useful to see the arguments to perf_event_open
> and whether the perf events ring buffer was mmapped
> per-cpu or per-thread. That information will now be
> displayed when verbose is 2 i.e option -vv
>
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> Acked-by: Jiri Olsa <jolsa@...hat.com>
> ---
> tools/perf/util/evlist.c | 3 +++
> tools/perf/util/evsel.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 55 insertions(+)
>
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 160036e..dfc267b 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -14,6 +14,7 @@
> #include "target.h"
> #include "evlist.h"
> #include "evsel.h"
> +#include "debug.h"
> #include <unistd.h>
>
> #include "parse-events.h"
> @@ -454,6 +455,7 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int m
> int nr_cpus = cpu_map__nr(evlist->cpus);
> int nr_threads = thread_map__nr(evlist->threads);
>
> + pr_debug2("perf event ring buffer mmapped per cpu\n");
> for (cpu = 0; cpu < nr_cpus; cpu++) {
> int output = -1;
>
> @@ -492,6 +494,7 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, in
> int thread;
> int nr_threads = thread_map__nr(evlist->threads);
>
> + pr_debug2("perf event ring buffer mmapped per thread\n");
> for (thread = 0; thread < nr_threads; thread++) {
> int output = -1;
>
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index dea0684..8978213 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -21,6 +21,7 @@
> #include "thread_map.h"
> #include "target.h"
> #include "perf_regs.h"
> +#include "debug.h"
>
> static struct {
> bool sample_id_all;
> @@ -817,6 +818,54 @@ static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
> return fd;
> }
>
> +static void show_attr(struct perf_event_attr *attr)
> +{
These things have been done usually as:
size_t perf_event_attr__fprintf(struct perf_event_attr *attr, FILE *fp)
Take a look at dso__fprintf() for instance, and grep for __fprintf on
tools/perf for other examples.
And then you can do just one test of (verbose >= 2) to call this
function.
> + pr_debug2("------------------------------------------------------------\n");
> + pr_debug2("perf_event_attr:\n");
> + pr_debug2(" type %u\n", attr->type);
> + pr_debug2(" size %u\n", attr->size);
> + pr_debug2(" config %#"PRIx64"\n", (uint64_t)attr->config);
> + pr_debug2(" sample_period %"PRIu64"\n", (uint64_t)attr->sample_period);
> + pr_debug2(" sample_freq %"PRIu64"\n", (uint64_t)attr->sample_freq);
> + pr_debug2(" sample_type %#"PRIx64"\n", (uint64_t)attr->sample_type);
> + pr_debug2(" read_format %#"PRIx64"\n", (uint64_t)attr->read_format);
> +
> + pr_debug2(" disabled %u ", attr->disabled);
> + pr_debug2("inherit %u\n", attr->inherit);
> + pr_debug2(" pinned %u ", attr->pinned);
> + pr_debug2("exclusive %u\n", attr->exclusive);
> + pr_debug2(" exclude_user %u ", attr->exclude_user);
> + pr_debug2("exclude_kernel %u\n", attr->exclude_kernel);
> + pr_debug2(" exclude_hv %u ", attr->exclude_hv);
> + pr_debug2("exclude_idle %u\n", attr->exclude_idle);
> + pr_debug2(" mmap %u ", attr->mmap);
> + pr_debug2("comm %u\n", attr->comm);
> + pr_debug2(" freq %u ", attr->freq);
> + pr_debug2("inherit_stat %u\n", attr->inherit_stat);
> + pr_debug2(" enable_on_exec %u ", attr->enable_on_exec);
> + pr_debug2("task %u\n", attr->task);
> + pr_debug2(" watermark %u ", attr->watermark);
> + pr_debug2("precise_ip %u\n", attr->precise_ip);
> + pr_debug2(" mmap_data %u ", attr->mmap_data);
> + pr_debug2("sample_id_all %u\n", attr->sample_id_all);
> + pr_debug2(" exclude_host %u ", attr->exclude_host);
> + pr_debug2("exclude_guest %u\n", attr->exclude_guest);
> + pr_debug2(" excl.callchain.kern %u ", attr->exclude_callchain_kernel);
> + pr_debug2("excl.callchain.user %u\n", attr->exclude_callchain_user);
> +
> + pr_debug2(" wakeup_events %u\n", attr->wakeup_events);
> + pr_debug2(" wakeup_watermark %u\n", attr->wakeup_watermark);
> + pr_debug2(" bp_type %#x\n", attr->bp_type);
> + pr_debug2(" bp_addr %#"PRIx64"\n", (uint64_t)attr->bp_addr);
> + pr_debug2(" config1 %#"PRIx64"\n", (uint64_t)attr->config1);
> + pr_debug2(" bp_len %"PRIu64"\n", (uint64_t)attr->bp_len);
> + pr_debug2(" config2 %#"PRIx64"\n", (uint64_t)attr->config2);
> + pr_debug2(" branch_sample_type %#"PRIx64"\n", (uint64_t)attr->branch_sample_type);
> + pr_debug2(" sample_regs_user %#"PRIx64"\n", (uint64_t)attr->sample_regs_user);
> + pr_debug2(" sample_stack_user %u\n", attr->sample_stack_user);
> + pr_debug2("------------------------------------------------------------\n");
> +}
> +
> static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
> struct thread_map *threads)
> {
> @@ -840,6 +889,7 @@ retry_sample_id:
> if (perf_missing_features.sample_id_all)
> evsel->attr.sample_id_all = 0;
>
> + show_attr(&evsel->attr);
> for (cpu = 0; cpu < cpus->nr; cpu++) {
>
> for (thread = 0; thread < threads->nr; thread++) {
> @@ -850,6 +900,8 @@ retry_sample_id:
>
> group_fd = get_group_fd(evsel, cpu, thread);
>
> + pr_debug2("perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n",
> + pid, cpus->map[cpu], group_fd, flags);
> FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
> pid,
> cpus->map[cpu],
> --
> 1.7.11.7
--
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