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perf kvm stat live: Use perf_evlist__add_pollfd() instead of local equivalent 

Since we can add file descriptors to the evlist pollfd and it will
autogrow, no need to copy all events to a local pollfd array, just add
the timer and stdin file descriptors.

Reviewed-by: David Ahern <dsahern@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-2hvp9iromiheh6rl4oaa08x5@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2014-08-18 17:12:30 -03:00
parent 9ae28035b8
commit 0a04c9e0b2
1 changed files with 9 additions and 13 deletions
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22
tools/perf/builtin-kvm.c
View File

@ -919,15 +919,8 @@ static int kvm_events_live_report(struct perf_kvm_stat *kvm)
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);
/* copy pollfds -- need to add timerfd and stdin */
/* use pollfds -- need to add timerfd and stdin */
nr_fds = kvm->evlist->nr_fds;
pollfds = zalloc(sizeof(struct pollfd) * (nr_fds + 2));
if (!pollfds) {
err = -ENOMEM;
goto out;
}
memcpy(pollfds, kvm->evlist->pollfd,
sizeof(struct pollfd) * kvm->evlist->nr_fds);
/* add timer fd */
if (perf_kvm__timerfd_create(kvm) < 0) {
@ -935,17 +928,21 @@ static int kvm_events_live_report(struct perf_kvm_stat *kvm)
goto out;
}
pollfds[nr_fds].fd = kvm->timerfd;
pollfds[nr_fds].events = POLLIN;
if (perf_evlist__add_pollfd(kvm->evlist, kvm->timerfd))
goto out;
nr_fds++;
pollfds[nr_fds].fd = fileno(stdin);
pollfds[nr_fds].events = POLLIN;
if (perf_evlist__add_pollfd(kvm->evlist, fileno(stdin)))
goto out;
nr_stdin = nr_fds;
nr_fds++;
if (fd_set_nonblock(fileno(stdin)) != 0)
goto out;
pollfds = kvm->evlist->pollfd;
/* everything is good - enable the events and process */
perf_evlist__enable(kvm->evlist);
@ -979,7 +976,6 @@ out:
close(kvm->timerfd);
tcsetattr(0, TCSAFLUSH, &save);
free(pollfds);
return err;
}