diff options
| author | Patrick Palka | 2013-10-25 20:25:49 -0400 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo | 2013-11-11 15:56:39 -0300 |
| commit | d53e57d039c323fe3a43630e9f729df48134e2c9 (patch) | |
| tree | 0a05962626813d4901ee82d3fa4aecae99d8ad58 /tools | |
| parent | caea6cf52139116e43e615d87fcbf9823e197fdf (diff) | |
perf ui tui progress: Don't force a refresh during progress update
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 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 ~2x faster (1.1s
vs 0.55s) on my machines. (These numbers were measured by running "time
perf report" on an 8MB perf.data and pressing 'q' immediately.)
Signed-off-by: Patrick Palka <patrick@parcs.ath.cx>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Ingo Molnar <mingo@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/r/1382747149-9716-1-git-send-email-patrick@parcs.ath.cx
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/ui/tui/progress.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/ui/tui/progress.c b/tools/perf/ui/tui/progress.c index 3e2d936d7443..c61d14b101e0 100644 --- a/tools/perf/ui/tui/progress.c +++ b/tools/perf/ui/tui/progress.c @@ -18,13 +18,14 @@ static void tui_progress__update(struct ui_progress *p) if (p->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 *)p->title); + SLsmg_fill_region(y, 1, 1, SLtt_Screen_Cols - 2, ' '); SLsmg_set_color(HE_COLORSET_SELECTED); bar = ((SLtt_Screen_Cols - 2) * p->curr) / p->total; SLsmg_fill_region(y, 1, 1, bar, ' '); |