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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@elte.hu>,
	Andrew Morton <akpm@linux-foundation.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	"H. Peter Anvin" <hpa@zytor.com>
Subject: [RFC][PATCH 08/11] ftrace: Avoid recording mcount on .init sections directly
Date: Wed, 20 Apr 2011 22:28:33 -0400
Message-ID: <20110421023738.953028219@goodmis.org> (raw)
In-Reply-To: <20110421022825.535486725@goodmis.org>

[-- Attachment #0: 0008-ftrace-Avoid-recording-mcount-on-.init-sections-dire.patch --]
[-- Type: text/plain, Size: 2302 bytes --]

From: Steven Rostedt <srostedt@redhat.com>

The init and exit sections should not be traced and adding a call to
mcount to them is a waste of text and instruction cache. Have the
macro section attributes include notrace to ignore these functions
for tracing from the build.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 include/linux/init.h |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/linux/init.h b/include/linux/init.h
index 577671c..9146f39 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -79,29 +79,29 @@
 #define __exitused  __used
 #endif
 
-#define __exit          __section(.exit.text) __exitused __cold
+#define __exit          __section(.exit.text) __exitused __cold notrace
 
 /* Used for HOTPLUG */
-#define __devinit        __section(.devinit.text) __cold
+#define __devinit        __section(.devinit.text) __cold notrace
 #define __devinitdata    __section(.devinit.data)
 #define __devinitconst   __section(.devinit.rodata)
-#define __devexit        __section(.devexit.text) __exitused __cold
+#define __devexit        __section(.devexit.text) __exitused __cold notrace
 #define __devexitdata    __section(.devexit.data)
 #define __devexitconst   __section(.devexit.rodata)
 
 /* Used for HOTPLUG_CPU */
-#define __cpuinit        __section(.cpuinit.text) __cold
+#define __cpuinit        __section(.cpuinit.text) __cold notrace
 #define __cpuinitdata    __section(.cpuinit.data)
 #define __cpuinitconst   __section(.cpuinit.rodata)
-#define __cpuexit        __section(.cpuexit.text) __exitused __cold
+#define __cpuexit        __section(.cpuexit.text) __exitused __cold notrace
 #define __cpuexitdata    __section(.cpuexit.data)
 #define __cpuexitconst   __section(.cpuexit.rodata)
 
 /* Used for MEMORY_HOTPLUG */
-#define __meminit        __section(.meminit.text) __cold
+#define __meminit        __section(.meminit.text) __cold notrace
 #define __meminitdata    __section(.meminit.data)
 #define __meminitconst   __section(.meminit.rodata)
-#define __memexit        __section(.memexit.text) __exitused __cold
+#define __memexit        __section(.memexit.text) __exitused __cold notrace
 #define __memexitdata    __section(.memexit.data)
 #define __memexitconst   __section(.memexit.rodata)
 
-- 
1.7.2.3



  parent reply index

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-21  2:28 [RFC][PATCH 00/11] ftrace/recordmcount: Remove useless mcount calls not being traced Steven Rostedt
2011-04-21  2:28 ` [RFC][PATCH 01/11] ftrace/trivial: Clean up recordmcount.c to use Linux style comparisons Steven Rostedt
2011-04-21  8:46   ` Alan Cox
2011-04-21 11:36     ` Steven Rostedt
2011-04-21 12:28       ` Steven Rostedt
2011-04-22 15:09   ` John Reiser
2011-04-22 15:52     ` Thiago Farina
2011-04-22 16:05       ` Steven Rostedt
2011-04-26 18:52         ` Thiago Farina
2011-04-26 19:09           ` Steven Rostedt
2011-04-22 16:13     ` Steven Rostedt
2011-04-22 17:40       ` John Reiser
2011-04-22 17:56         ` H. Peter Anvin
2011-05-18 18:31   ` [tip:perf/core] " tip-bot for Steven Rostedt
2011-06-16 14:04   ` tip-bot for Steven Rostedt
2011-04-21  2:28 ` [RFC][PATCH 02/11] ftrace/trivial: Clean up record mcount to use Linux switch style Steven Rostedt
2011-05-18 18:31   ` [tip:perf/core] " tip-bot for Steven Rostedt
2011-06-16 14:04   ` tip-bot for Steven Rostedt
2011-04-21  2:28 ` [RFC][PATCH 03/11] ftrace: Add .kprobe.text section to whitelist for recordmcount.c Steven Rostedt
2011-05-18 18:32   ` [tip:perf/core] " tip-bot for Steven Rostedt
2011-06-16 14:05   ` tip-bot for Steven Rostedt
2011-04-21  2:28 ` [RFC][PATCH 04/11] ftrace/recordmcount: Modify only executable sections Steven Rostedt
2011-05-18 18:32   ` [tip:perf/core] " tip-bot for Steven Rostedt
2011-06-16 14:05   ` tip-bot for Steven Rostedt
2011-04-21  2:28 ` [RFC][PATCH 05/11] ftrace/recordmcount: Make ignored mcount calls into nops at compile time Steven Rostedt
2011-05-18 18:32   ` [tip:perf/core] " tip-bot for Steven Rostedt
2011-06-16 14:05   ` tip-bot for Steven Rostedt
2011-04-21  2:28 ` [RFC][PATCH 06/11] ftrace/recordmcount: Add warning logic to warn on mcount not recorded Steven Rostedt
2011-05-18 18:33   ` [tip:perf/core] " tip-bot for Steven Rostedt
2011-06-16 14:06   ` tip-bot for Steven Rostedt
2011-04-21  2:28 ` [RFC][PATCH 07/11] kbuild/recordmcount: Add RECORDMCOUNT_WARN to warn about mcount callers Steven Rostedt
2011-04-21  2:40   ` Steven Rostedt
2011-04-21 20:40   ` Michal Marek
2011-04-26 19:08     ` Steven Rostedt
2011-05-18 18:33   ` [tip:perf/core] " tip-bot for Steven Rostedt
2011-06-16 14:06   ` tip-bot for Steven Rostedt
2011-04-21  2:28 ` Steven Rostedt [this message]
2011-05-18 18:34   ` [tip:perf/core] ftrace: Avoid recording mcount on .init sections directly tip-bot for Steven Rostedt
2011-06-16 14:07   ` tip-bot for Steven Rostedt
2011-04-21  2:28 ` [RFC][PATCH 09/11] ftrace/x86: Do not trace .discard.text section Steven Rostedt
2011-05-18 18:34   ` [tip:perf/core] " tip-bot for Steven Rostedt
2011-06-16 14:07   ` tip-bot for Steven Rostedt
2011-04-21  2:28 ` [RFC][PATCH 10/11] ftrace/recordmcount: Remove duplicate code to find mcount symbol Steven Rostedt
2011-05-18 18:34   ` [tip:perf/core] " tip-bot for Steven Rostedt
2011-06-16 14:07   ` tip-bot for Steven Rostedt
2011-04-21  2:28 ` [RFC][PATCH 11/11] ftrace/recordmcount: Add helper function get_sym_str_and_relp() Steven Rostedt
2011-05-18 18:35   ` [tip:perf/core] " tip-bot for Steven Rostedt
2011-06-16 14:08   ` tip-bot for Steven Rostedt

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