linux-kernel - [PATCH 2/4] perf ui progress: Fix progress update

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Message-Id: <20170908120510.22515-3-jolsa@kernel.org>
Date:   Fri,  8 Sep 2017 14:05:08 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 2/4] perf ui progress: Fix progress update

We currently update the 'next' variable only with a single
step value. But it's possible the 'adv' update is bigger
than single 'step' value. This would leave 'next' value
under counted and force unnecessary ui_progress__ops->update
calls.

Calculate the amount of steps we need for 'adv' update
and increase the 'next' with that amounts of steps.

Link: http://lkml.kernel.org/n/tip-4xtvcl0ykeg3ndg2gg46kvyn@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/ui/progress.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/perf/ui/progress.c b/tools/perf/ui/progress.c
index a9c15804b1f6..ae91c8148edf 100644
--- a/tools/perf/ui/progress.c
+++ b/tools/perf/ui/progress.c
@@ -1,3 +1,4 @@
+#include <linux/kernel.h>
 #include "../cache.h"
 #include "progress.h"
 
@@ -14,10 +15,14 @@ struct ui_progress_ops *ui_progress__ops = &null_progress__ops;
 
 void ui_progress__update(struct ui_progress *p, u64 adv)
 {
+	u64 last = p->curr;
+
 	p->curr += adv;
 
 	if (p->curr >= p->next) {
-		p->next += p->step;
+		u64 nr = DIV_ROUND_UP(p->curr - last, p->step);
+
+		p->next += nr * p->step;
 		ui_progress__ops->update(p);
 	}
 }
-- 
2.9.5