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From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
To: Arnaldo Carvalho de Melo <acme@redhat.com>, Ingo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Pekka Enberg <penberg@kernel.org>,
	linux-kernel@vger.kernel.org, yrl.pp-manager.tt@hitachi.com,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
	Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: [PATCH -tip v2 9/9] [BUGFIX] perf probe: Filter out redundant inline-instances
Date: Thu, 11 Aug 2011 20:03:18 +0900	[thread overview]
Message-ID: <20110811110317.19900.59525.stgit@fedora15> (raw)
In-Reply-To: <20110811110220.19900.54963.stgit@fedora15>

With gcc4.6, some instances of concrete inlined function
looks redundant and broken, because it appears inside of a
concrete instance and its call_file and call_line are same
as the original abstruct's decl_file and decl_line respectively.

e.g.
 [  d1aa]    subprogram
             external             (flag) Yes
             name                 (strp) "add_timer"
             decl_file            (data1) 2		;here is original
             decl_line            (data2) 847		;line and file
             prototyped           (flag) Yes
             inline               (data1) inlined (1)
             sibling              (ref4) [  d1c6]
...
 [ 11d84]    subprogram
             abstract_origin      (ref4) [  d1aa]	; concrete instance
             low_pc               (addr) .text+0x000000000000246f <add_timer>
             high_pc              (addr) .text+0x000000000000248b <mod_timer_pending>
             frame_base           (block1)               [   0] call_frame_cfa
             sibling              (ref4) [ 11dd9]
 [ 11d9f]      formal_parameter
               abstract_origin      (ref4) [  d1b9]
               location             (data4) location list [  701b]
 [ 11da8]      inlined_subroutine
               abstract_origin      (ref4) [  d1aa]	; redundant instance
               low_pc               (addr) .text+0x000000000000247e <add_timer+0xf>
               high_pc              (addr) .text+0x0000000000002480 <add_timer+0x11>
               call_file            (data1) 2		; call line and file
               call_line            (data2) 847		; are same as above


Those redundant instances leads unwilling results;

e.g. find probe points inside of functions even if we specify
a function entry as below;

$ perf probe -V add_timer
Available variables at add_timer
        @<add_timer+0>
                struct timer_list*      timer
        @<add_timer+15>
                (No matched variables)

So, this filters out those redundant instances based on
call-site and decl-site information.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
---

 tools/perf/util/dwarf-aux.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index d0f4048..ee51e9b 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -307,6 +307,17 @@ static int die_get_call_fileno(Dwarf_Die *in_die)
 		return -ENOENT;
 }
 
+/* Get the declared file index number in CU DIE */
+static int die_get_decl_fileno(Dwarf_Die *pdie)
+{
+	Dwarf_Sword idx;
+
+	if (die_get_attr_sdata(pdie, DW_AT_decl_file, &idx) == 0)
+		return (int)idx;
+	else
+		return -ENOENT;
+}
+
 /**
  * die_get_call_file - Get callsite file name of inlined function instance
  * @in_die: a DIE of an inlined function instance
@@ -467,6 +478,7 @@ static int __die_walk_instances_cb(Dwarf_Die *inst, void *data)
 	Dwarf_Die origin_mem;
 	Dwarf_Attribute *attr;
 	Dwarf_Die *origin;
+	int tmp;
 
 	attr = dwarf_attr(inst, DW_AT_abstract_origin, &attr_mem);
 	if (attr == NULL)
@@ -476,6 +488,16 @@ static int __die_walk_instances_cb(Dwarf_Die *inst, void *data)
 	if (origin == NULL || origin->addr != iwp->addr)
 		return DIE_FIND_CB_CONTINUE;
 
+	/* Ignore redundant instances */
+	if (dwarf_tag(inst) == DW_TAG_inlined_subroutine) {
+		dwarf_decl_line(origin, &tmp);
+		if (die_get_call_lineno(inst) == tmp) {
+			tmp = die_get_decl_fileno(origin);
+			if (die_get_call_fileno(inst) == tmp)
+				return DIE_FIND_CB_CONTINUE;
+		}
+	}
+
 	iwp->retval = iwp->callback(inst, iwp->data);
 
 	return (iwp->retval) ? DIE_FIND_CB_END : DIE_FIND_CB_CONTINUE;


  parent reply	other threads:[~2011-08-11 11:27 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-11 11:02 [PATCH -tip v2 0/9]perf probe bugfixes Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 1/9] [BUGFIX] perf-probe: Fix a memory leak for scopes array Masami Hiramatsu
2011-08-14 15:39   ` [tip:perf/core] perf probe: " tip-bot for Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 2/9] [BUGFIX] perf probe: Fix line walker to check CU correctly Masami Hiramatsu
2011-08-14 15:40   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 3/9] [BUGFIX] perf probe: Fix to search nested inlined functions in CU Masami Hiramatsu
2011-08-14 15:41   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 4/9] [BUGFIX] perf probe: Fix to walk all inline instances Masami Hiramatsu
2011-08-14 15:42   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 5/9] [BUGFIX] perf probe: Warn when more than one line are given Masami Hiramatsu
2011-08-14 15:44   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 6/9] [BUGFIX] perf probe: Fix to search local variables in appropriate scope Masami Hiramatsu
2011-08-14 15:45   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:03 ` [PATCH -tip v2 7/9] [BUGFIX] perf probe: Avoid searching variables in intermediate scopes Masami Hiramatsu
2011-08-14 15:47   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:03 ` [PATCH -tip v2 8/9] [BUGFIX] perf probe: Search concrete out-of-line instances Masami Hiramatsu
2011-08-14 15:48   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:03 ` Masami Hiramatsu [this message]
2011-08-14 15:50   ` [tip:perf/core] perf probe: Filter out redundant inline-instances tip-bot for Masami Hiramatsu

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