Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753254Ab3JWV7a (ORCPT ); Wed, 23 Oct 2013 17:59:30 -0400 Received: from mail-qa0-f43.google.com ([209.85.216.43]:46793 "EHLO mail-qa0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752119Ab3JWV73 (ORCPT ); Wed, 23 Oct 2013 17:59:29 -0400 From: Patrick Palka To: linux-kernel@vger.kernel.org Cc: Peter Zijlstra , Paul Mackerras , Ingo Molnar Subject: [PATCH] perf/ui/tui: don't force a refresh during progress update Date: Wed, 23 Oct 2013 17:59:22 -0400 Message-Id: <1382565562-15108-1-git-send-email-patrick@parcs.ath.cx> X-Mailer: git-send-email 1.8.4.rc3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2470 Lines: 58 Each call to tui_progress__update() would forcibly refresh the entire screen. This is somewhat inefficient and causes noticable flickering during the startup of perf-report, especially on large/slow terminals. It looks like the force-refresh in tui_progress__update() serves no purpose other than to clear the screen so that the progress bar of a previous operation does not subsume with that of a subsequent operation. But we can do just that in a much more efficient manner by clearing only the region that a previous progress bar may have occupied before repainting the new progress bar. Then the force-refresh could be removed with no change in visuals. This patch disables the slow force-refresh in tui_progress__update() and instead calls SLsmg_fill_region() on the entire area that the progress bar may occupy before repainting it. This change makes the startup of perf-report much faster and appear much "smoother". It turns out that this was a big bottleneck in the startup speed of perf-report -- with this patch, perf-report starts up ~1.6x faster (0.8s vs 0.5s) on my machines. (These numbers were measured by running "time perf report" on an 8MB perf.data and pressing 'q' immediately.) Cc: Peter Zijlstra Cc: Paul Mackerras Cc: Ingo Molnar Signed-off-by: Patrick Palka --- tools/perf/ui/tui/progress.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/perf/ui/tui/progress.c b/tools/perf/ui/tui/progress.c index 6c2184d..641049a 100644 --- a/tools/perf/ui/tui/progress.c +++ b/tools/perf/ui/tui/progress.c @@ -17,13 +17,14 @@ static void tui_progress__update(u64 curr, u64 total, const char *title) if (total == 0) return; - ui__refresh_dimensions(true); + ui__refresh_dimensions(false); pthread_mutex_lock(&ui__lock); y = SLtt_Screen_Rows / 2 - 2; SLsmg_set_color(0); SLsmg_draw_box(y, 0, 3, SLtt_Screen_Cols); SLsmg_gotorc(y++, 1); SLsmg_write_string((char *)title); + SLsmg_fill_region(y, 1, 1, SLtt_Screen_Cols - 2, ' '); SLsmg_set_color(HE_COLORSET_SELECTED); bar = ((SLtt_Screen_Cols - 2) * curr) / total; SLsmg_fill_region(y, 1, 1, bar, ' '); -- 1.8.4.rc3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/