linux-kernel - [PATCH] scripts/bloat-o-meter: fix percent change output

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Message-Id: <1466494811-80382-1-git-send-email-heiko.carstens@de.ibm.com>
Date:	Tue, 21 Jun 2016 09:40:11 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Subject: [PATCH] scripts/bloat-o-meter: fix percent change output

commit b21e91c305bc "scripts/bloat-o-meter: print percent change"
introduced an additional line to the output of the bloat-a-meter
script which shows the percent change. However it uses integer instead
of floating point arithmetics.

Let's enforce floating point arithmetics to improve the output (note
"chg"):

Before:

add/remove: 0/0 grow/shrink: 2/0 up/down: 24/0 (24)
function                                     old     new   delta
condev_setup                                  96     114     +18
vermagic                                      58      64      +6
Total: Before=24794284, After=24794308, chg 0.000000%

After:

add/remove: 0/0 grow/shrink: 2/0 up/down: 24/0 (24)
function                                     old     new   delta
condev_setup                                  96     114     +18
vermagic                                      58      64      +6
Total: Before=24794284, After=24794308, chg 0.000097%

Cc: Vineet Gupta <Vineet.Gupta1@...opsys.com>
Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
---
 scripts/bloat-o-meter | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/bloat-o-meter b/scripts/bloat-o-meter
index 0254f3ba0dba..5a5d383004f5 100755
--- a/scripts/bloat-o-meter
+++ b/scripts/bloat-o-meter
@@ -68,4 +68,4 @@ for d, n in delta:
     if d: print("%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d))
 
 print("Total: Before=%d, After=%d, chg %f%%" % \
-    (otot, ntot, (ntot - otot)*100/otot))
+    (otot, ntot, (ntot - otot)*100.0/otot))
-- 
2.6.6