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SubjectRe: [PATCH 08/10] perf kvm stat live: Use perf_evlist__add_pollfd() instead of local equivalent
On 8/22/14, 2:59 PM, Arnaldo Carvalho de Melo wrote:
> From: Arnaldo Carvalho de Melo <acme@redhat.com>
>
> 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.
>
> 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>
> ---
> tools/perf/builtin-kvm.c | 22 +++++++++-------------
> 1 file changed, 9 insertions(+), 13 deletions(-)
>
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index 1a4ef9cd9d5f..b192234096b6 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -921,15 +921,8 @@ 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) {
> @@ -937,17 +930,21 @@ 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);
>
> @@ -981,7 +978,6 @@ out:
> close(kvm->timerfd);
>
> tcsetattr(0, TCSAFLUSH, &save);
> - free(pollfds);
> return err;
> }
>
>

Much simpler. Looks ok to me.

Reviewed-by: David Ahern <dsahern@gmail.com>

David


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