From: Patrick Palka Date: Sat, 26 Oct 2013 00:25:49 +0000 (-0400) Subject: perf ui tui progress: Don't force a refresh during progress update X-Git-Tag: v3.13-rc1~88^2^2~22 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d53e57d039c323fe3a43630e9f729df48134e2c9;p=pandora-kernel.git 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 Acked-by: Ingo Molnar Cc: Ingo Molnar Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1382747149-9716-1-git-send-email-patrick@parcs.ath.cx Signed-off-by: Arnaldo Carvalho de Melo --- Reading git-diff-tree failed