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Date: Mon, 17 Dec 2012 12:54:20 +0100
From: Alexander Gordeev <agordeev@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: [PATCH RFC -tip 6/6] perf/tool: Hack 'pid' as 'irq' for
sys_perf_event_open()
This is not a decent change, just a quick fix to make
possible testing of IRQ-bound performance events.
Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
tools/perf/builtin-record.c | 9 +++++++++
tools/perf/builtin-stat.c | 11 +++++++++++
tools/perf/util/evlist.c | 4 +++-
tools/perf/util/evsel.c | 3 +++
tools/perf/util/evsel.h | 1 +
tools/perf/util/target.c | 4 ++++
tools/perf/util/thread_map.c | 16 ++++++++++++++++
7 files changed, 47 insertions(+), 1 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index f3151d3..494eec2 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -228,6 +228,7 @@ static int perf_record__open(struct perf_record *rec)
struct perf_evlist *evlist = rec->evlist;
struct perf_session *session = rec->session;
struct perf_record_opts *opts = &rec->opts;
+ int irq = false;
int rc = 0;
/*
@@ -239,6 +240,10 @@ static int perf_record__open(struct perf_record *rec)
perf_evlist__config_attrs(evlist, opts);
+ if (perf_target__has_cpu(&opts->target) &&
+ perf_target__has_task(&opts->target))
+ irq = true;
+
list_for_each_entry(pos, &evlist->entries, node) {
struct perf_event_attr *attr = &pos->attr;
/*
@@ -255,6 +260,8 @@ static int perf_record__open(struct perf_record *rec)
*/
bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;
+ pos->irq = irq;
+
fallback_missing_features:
if (opts->exclude_guest_missing)
attr->exclude_guest = attr->exclude_host = 0;
@@ -1000,6 +1007,8 @@ const struct option record_options[] = {
parse_events_option),
OPT_CALLBACK(0, "filter", &record.evlist, "filter",
"event filter", parse_filter),
+ OPT_STRING('I', "irq", &record.opts.target.pid, "irq",
+ "record events on existing irq handler"),
OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
"record events on existing process id"),
OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index c247fac..f56f195 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -145,6 +145,15 @@ retry:
if (exclude_guest_missing)
evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
+ if (perf_target__has_cpu(&target) && perf_target__has_task(&target)) {
+ evsel->irq = true;
+ ret = perf_evsel__open(evsel, perf_evsel__cpus(evsel),
+ evsel_list->threads);
+ if (ret)
+ goto check_ret;
+ return 0;
+ }
+
if (perf_target__has_cpu(&target)) {
ret = perf_evsel__open_per_cpu(evsel, perf_evsel__cpus(evsel));
if (ret)
@@ -1108,6 +1117,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
"event filter", parse_filter),
OPT_BOOLEAN('i', "no-inherit", &no_inherit,
"child tasks do not inherit counters"),
+ OPT_STRING('I', "irq", &target.pid, "irq",
+ "stat events on existing irq handler"),
OPT_STRING('p', "pid", &target.pid, "pid",
"stat events on existing process id"),
OPT_STRING('t', "tid", &target.tid, "tid",
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 7052934..7809f415 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -572,7 +572,9 @@ int perf_evlist__create_maps(struct perf_evlist *evlist,
if (evlist->threads == NULL)
return -1;
- if (perf_target__has_task(target))
+ if (perf_target__has_task(target) && perf_target__has_cpu(target))
+ evlist->cpus = cpu_map__new(target->cpu_list);
+ else if (perf_target__has_task(target))
evlist->cpus = cpu_map__dummy_new();
else if (!perf_target__has_cpu(target) && !target->uses_mmap)
evlist->cpus = cpu_map__dummy_new();
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 1b16dd1..748df69 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -738,6 +738,9 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
pid = evsel->cgrp->fd;
}
+ if (evsel->irq)
+ flags = PERF_FLAG_PID_IRQ;
+
for (cpu = 0; cpu < cpus->nr; cpu++) {
for (thread = 0; thread < threads->nr; thread++) {
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 3d2b801..a1782a4 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -71,6 +71,7 @@ struct perf_evsel {
unsigned int sample_size;
bool supported;
bool needs_swap;
+ bool irq;
/* parse modifier helper */
int exclude_GH;
struct perf_evsel *leader;
diff --git a/tools/perf/util/target.c b/tools/perf/util/target.c
index 065528b..a4469db 100644
--- a/tools/perf/util/target.c
+++ b/tools/perf/util/target.c
@@ -20,12 +20,14 @@ enum perf_target_errno perf_target__validate(struct perf_target *target)
if (target->pid)
target->tid = target->pid;
+#if (0)
/* CPU and PID are mutually exclusive */
if (target->tid && target->cpu_list) {
target->cpu_list = NULL;
if (ret == PERF_ERRNO_TARGET__SUCCESS)
ret = PERF_ERRNO_TARGET__PID_OVERRIDE_CPU;
}
+#endif
/* UID and PID are mutually exclusive */
if (target->tid && target->uid_str) {
@@ -41,12 +43,14 @@ enum perf_target_errno perf_target__validate(struct perf_target *target)
ret = PERF_ERRNO_TARGET__UID_OVERRIDE_CPU;
}
+#if (0)
/* PID and SYSTEM are mutually exclusive */
if (target->tid && target->system_wide) {
target->system_wide = false;
if (ret == PERF_ERRNO_TARGET__SUCCESS)
ret = PERF_ERRNO_TARGET__PID_OVERRIDE_SYSTEM;
}
+#endif
/* UID and SYSTEM are mutually exclusive */
if (target->uid_str && target->system_wide) {
diff --git a/tools/perf/util/thread_map.c b/tools/perf/util/thread_map.c
index 9b5f856..48cc8ec 100644
--- a/tools/perf/util/thread_map.c
+++ b/tools/perf/util/thread_map.c
@@ -159,8 +159,12 @@ static struct thread_map *thread_map__new_by_pid_str(const char *pid_str)
struct thread_map *threads = NULL, *nt;
char name[256];
int items, total_tasks = 0;
+#if (0)
struct dirent **namelist = NULL;
int i, j = 0;
+#else
+ int j = 0;
+#endif
pid_t pid, prev_pid = INT_MAX;
char *end_ptr;
struct str_node *pos;
@@ -180,7 +184,11 @@ static struct thread_map *thread_map__new_by_pid_str(const char *pid_str)
continue;
sprintf(name, "/proc/%d/task", pid);
+#if (0)
items = scandir(name, &namelist, filter, NULL);
+#else
+ items = 1;
+#endif
if (items <= 0)
goto out_free_threads;
@@ -192,12 +200,18 @@ static struct thread_map *thread_map__new_by_pid_str(const char *pid_str)
threads = nt;
+#if (0)
for (i = 0; i < items; i++) {
threads->map[j++] = atoi(namelist[i]->d_name);
free(namelist[i]);
}
+#else
+ threads->map[j++] = pid;
+#endif
threads->nr = total_tasks;
+#if (0)
free(namelist);
+#endif
}
out:
@@ -205,9 +219,11 @@ out:
return threads;
out_free_namelist:
+#if (0)
for (i = 0; i < items; i++)
free(namelist[i]);
free(namelist);
+#endif
out_free_threads:
free(threads);
--
1.7.7.6
--
Regards,
Alexander Gordeev
agordeev@...hat.com
--
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