linux-kernel - [tip:perf/core] perf probe: Remove bias offset to find probe point by address

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Date:	Mon, 2 Mar 2015 22:26:08 -0800
From:	tip-bot for Masami Hiramatsu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	masami.hiramatsu.pt@...achi.com, tglx@...utronix.de,
	peterz@...radead.org, mingo@...nel.org, dsahern@...il.com,
	linux-kernel@...r.kernel.org, hpa@...or.com, jolsa@...hat.com,
	naota@...sp.net, acme@...hat.com, namhyung@...nel.org
Subject: [tip:perf/core] perf probe:
  Remove bias offset to find probe point by address

Commit-ID:  0104fe69e0287cf3635657b4c6b26a18e0091697
Gitweb:     http://git.kernel.org/tip/0104fe69e0287cf3635657b4c6b26a18e0091697
Author:     Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
AuthorDate: Mon, 2 Mar 2015 21:49:46 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 2 Mar 2015 12:34:38 -0300

perf probe: Remove bias offset to find probe point by address

Remove bias offset to find probe point by address.

Without this patch, probe points on kernel and executables are shown
correctly, but do not work with libraries:

  # ./perf probe -l
    probe:do_fork        (on do_fork@...nel/fork.c)
    probe_libc:malloc    (on malloc in /usr/lib64/libc-2.17.so)
    probe_perf:strlist__new (on strlist__new@...l/strlist.c in /home/mhiramat/ksrc/linux-3/tools/perf/perf)

Removing bias allows it to show it as real place:

  # ./perf probe -l
    probe:do_fork        (on do_fork@...nel/fork.c)
    probe_libc:malloc    (on __libc_malloc@...loc/malloc.c in /usr/lib64/libc-2.17.so)
    probe_perf:strlist__new (on strlist__new@...l/strlist.c in /home/mhiramat/ksrc/linux-3/tools/perf/perf)

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Naohiro Aota <naota@...sp.net>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20150302124946.9191.64085.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/probe-finder.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index d141935..46f009a 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1345,11 +1345,8 @@ int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr,
 	const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp;
 	int baseline = 0, lineno = 0, ret = 0;
 
-	/* Adjust address with bias */
-	addr += dbg->bias;
-
 	/* Find cu die */
-	if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr - dbg->bias, &cudie)) {
+	if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr, &cudie)) {
 		pr_warning("Failed to find debug information for address %lx\n",
 			   addr);
 		ret = -EINVAL;
--
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