linux-kernel - [tip:perf/urgent] perf annotate: Fix off by one symbol hist size allocation and hit accounting

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Message-ID: <tip-pqjaq4cr1xs2xen73pjhbav4@git.kernel.org>
Date:	Sat, 31 Mar 2012 00:46:41 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <acme@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, paulus@...ba.org,
	acme@...hat.com, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, efault@....de, davem@...emloft.net,
	dumitru.sorin87@...il.com, fweisbec@...il.com, dsahern@...il.com,
	tglx@...utronix.de
Subject: [tip:perf/urgent] perf annotate:
  Fix off by one symbol hist size allocation and hit accounting

Commit-ID:  64c17be4ffb8d6971051aec77ca1de4cfadb166d
Gitweb:     http://git.kernel.org/tip/64c17be4ffb8d6971051aec77ca1de4cfadb166d
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Wed, 28 Mar 2012 12:49:35 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 29 Mar 2012 17:13:45 -0300

perf annotate: Fix off by one symbol hist size allocation and hit accounting

We were not noticing it because symbol__inc_addr_samples was erroneously
dropping samples that hit the last byte in a function.

Working on a fix for a problem reported by David Miller, Stephane
Eranian and Sorin Dumitru, where addresses < sym->start were causing
problems, I noticed this other problem.

Cc: David Ahern <dsahern@...il.com>
Cc: David Miller <davem@...emloft.net>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sorin Dumitru <dumitru.sorin87@...il.com>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-pqjaq4cr1xs2xen73pjhbav4@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/annotate.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 31ba2a2..199f69e 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -28,8 +28,8 @@ int symbol__annotate_init(struct map *map __used, struct symbol *sym)
 int symbol__alloc_hist(struct symbol *sym)
 {
 	struct annotation *notes = symbol__annotation(sym);
-	size_t sizeof_sym_hist = (sizeof(struct sym_hist) +
-				  (sym->end - sym->start) * sizeof(u64));
+	const size_t size = sym->end - sym->start + 1;
+	size_t sizeof_sym_hist = (sizeof(struct sym_hist) + size * sizeof(u64));
 
 	notes->src = zalloc(sizeof(*notes->src) + symbol_conf.nr_events * sizeof_sym_hist);
 	if (notes->src == NULL)
@@ -64,7 +64,7 @@ int symbol__inc_addr_samples(struct symbol *sym, struct map *map,
 
 	pr_debug3("%s: addr=%#" PRIx64 "\n", __func__, map->unmap_ip(map, addr));
 
-	if (addr >= sym->end)
+	if (addr > sym->end)
 		return 0;
 
 	offset = addr - sym->start;
--
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