2011-04-21 02:39:11

by Steven Rostedt

Subject: [RFC][PATCH 09/11] ftrace/x86: Do not trace .discard.text section

From: Steven Rostedt <[email protected]>

The section called .discard.text has tracing attached to it and is
currently ignored by ftrace. But it does include a call to the mcount
stub. Adding a notrace to the code keeps gcc from adding the useless
mcount caller to it.

Signed-off-by: Steven Rostedt <[email protected]>
---
arch/x86/include/asm/setup.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index db8aa19..647d8a0 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -88,7 +88,7 @@ void *extend_brk(size_t size, size_t align);
* executable.)
*/
#define RESERVE_BRK(name,sz) \
- static void __section(.discard.text) __used \
+ static void __section(.discard.text) __used notrace \
__brk_reservation_fn_##name##__(void) { \
asm volatile ( \
".pushsection .brk_reservation,\"aw\",@nobits;" \
--
1.7.2.3

2011-05-18 18:34:42

by Steven Rostedt

Subject: [tip:perf/core] ftrace/x86: Do not trace .discard.text section

Commit-ID: 2895cd2ab81dfb7bc22637bc110857db44a30b4a
Gitweb: http://git.kernel.org/tip/2895cd2ab81dfb7bc22637bc110857db44a30b4a
Author: Steven Rostedt <[email protected]>
AuthorDate: Wed, 13 Apr 2011 16:43:29 -0400
Committer: Steven Rostedt <[email protected]>
CommitDate: Mon, 16 May 2011 14:47:13 -0400

ftrace/x86: Do not trace .discard.text section

The section called .discard.text has tracing attached to it and is
currently ignored by ftrace. But it does include a call to the mcount
stub. Adding a notrace to the code keeps gcc from adding the useless
mcount caller to it.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Steven Rostedt <[email protected]>
---
arch/x86/include/asm/setup.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index db8aa19..647d8a0 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -88,7 +88,7 @@ void *extend_brk(size_t size, size_t align);
* executable.)
*/
#define RESERVE_BRK(name,sz) \
- static void __section(.discard.text) __used \
+ static void __section(.discard.text) __used notrace \
__brk_reservation_fn_##name##__(void) { \
asm volatile ( \
".pushsection .brk_reservation,\"aw\",@nobits;" \

2011-06-16 14:07:39

by Steven Rostedt

Subject: [tip:perf/core] ftrace/x86: Do not trace .discard.text section

Commit-ID: 406a733db0052fed66d17008430b6047ecea7b92
Gitweb: http://git.kernel.org/tip/406a733db0052fed66d17008430b6047ecea7b92
Author: Steven Rostedt <[email protected]>
AuthorDate: Wed, 13 Apr 2011 16:43:29 -0400
Committer: Steven Rostedt <[email protected]>
CommitDate: Tue, 17 May 2011 10:41:55 -0400

ftrace/x86: Do not trace .discard.text section

The section called .discard.text has tracing attached to it and is
currently ignored by ftrace. But it does include a call to the mcount
stub. Adding a notrace to the code keeps gcc from adding the useless
mcount caller to it.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Steven Rostedt <[email protected]>
---
arch/x86/include/asm/setup.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index db8aa19..647d8a0 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -88,7 +88,7 @@ void *extend_brk(size_t size, size_t align);
* executable.)
*/
#define RESERVE_BRK(name,sz) \
- static void __section(.discard.text) __used \
+ static void __section(.discard.text) __used notrace \
__brk_reservation_fn_##name##__(void) { \
asm volatile ( \
".pushsection .brk_reservation,\"aw\",@nobits;" \