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perf evlist: Adopt the pollfd array

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Allocating just the space needed for nr_cpus * nr_threads * nr_evsels,
not the MAX_NR_CPUS and counters.

LKML-Reference: <new-submission>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2011-01-11 22:30:02 -02:00
parent 361c99a661
commit 5c581041cf
4 changed files with 33 additions and 28 deletions
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26
tools/perf/builtin-top.c
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@@ -1193,8 +1193,6 @@ static void perf_session__mmap_read_counter(struct perf_session *self,
md->prev = old;
}
static struct pollfd *event_array;
static void perf_session__mmap_read(struct perf_session *self)
{
struct perf_evsel *counter;
@@ -1212,10 +1210,10 @@ static void perf_session__mmap_read(struct perf_session *self)
}
}
int nr_poll;
int group_fd;
static void start_counter(int i, struct perf_evsel *evsel)
static void start_counter(int i, struct perf_evlist *evlist,
struct perf_evsel *evsel)
{
struct xyarray *mmap_array = evsel->priv;
struct mmap_data *mm;
@@ -1281,9 +1279,9 @@ try_again:
if (group && group_fd == -1)
group_fd = FD(evsel, i, thread_index);
event_array[nr_poll].fd = FD(evsel, i, thread_index);
event_array[nr_poll].events = POLLIN;
nr_poll++;
evlist->pollfd[evlist->nr_fds].fd = FD(evsel, i, thread_index);
evlist->pollfd[evlist->nr_fds].events = POLLIN;
evlist->nr_fds++;
mm = xyarray__entry(mmap_array, i, thread_index);
mm->prev = 0;
@@ -1316,11 +1314,11 @@ static int __cmd_top(void)
for (i = 0; i < cpus->nr; i++) {
group_fd = -1;
list_for_each_entry(counter, &evsel_list->entries, node)
start_counter(i, counter);
start_counter(i, evsel_list, counter);
}
/* Wait for a minimal set of events before starting the snapshot */
poll(&event_array[0], nr_poll, 100);
poll(evsel_list->pollfd, evsel_list->nr_fds, 100);
perf_session__mmap_read(session);
@@ -1345,7 +1343,7 @@ static int __cmd_top(void)
perf_session__mmap_read(session);
if (hits == samples)
ret = poll(event_array, nr_poll, 100);
ret = poll(evsel_list->pollfd, evsel_list->nr_fds, 100);
}
return 0;
@@ -1426,11 +1424,6 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
usage_with_options(top_usage, options);
}
event_array = malloc((sizeof(struct pollfd) *
MAX_NR_CPUS * MAX_COUNTERS * threads->nr));
if (!event_array)
return -ENOMEM;
/* CPU and PID are mutually exclusive */
if (target_tid > 0 && cpu_list) {
printf("WARNING: PID switch overriding CPU\n");
@@ -1480,6 +1473,9 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
pos->attr.sample_period = default_interval;
}
if (perf_evlist__alloc_pollfd(evsel_list, cpus->nr, threads->nr) < 0)
goto out_free_fd;
sym_evsel = list_entry(evsel_list->entries.next, struct perf_evsel, node);
symbol_conf.priv_size = (sizeof(struct sym_entry) +