linux-kernel - [tip:tracing/core] ftrace: __start_mcount

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Message-ID: <tip-4b3b4c5e64ce26612646867ee354373620063534@git.kernel.org>
Date:	Sun, 13 Sep 2009 15:02:23 GMT
From:	tip-bot for John Reiser <jreiser@...wagon.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	rostedt@...dmis.org, jreiser@...wagon.com, jreiser@...wagon.com,
	tglx@...utronix.de
Subject: [tip:tracing/core] ftrace: __start_mcount_loc should be .init.rodata

Commit-ID:  4b3b4c5e64ce26612646867ee354373620063534
Gitweb:     http://git.kernel.org/tip/4b3b4c5e64ce26612646867ee354373620063534
Author:     John Reiser <jreiser@...wagon.com>
AuthorDate: Mon, 27 Jul 2009 11:23:50 -0700
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Sat, 12 Sep 2009 21:57:29 -0400

ftrace: __start_mcount_loc should be .init.rodata

__start_mcount_loc[] is unused after init, yet occupies RAM forever
as part of .rodata.  152kiB is typical on a 64-bit architecture.  Instead,
__start_mcount_loc should be in the interval [__init_begin, __init_end)
so that the space is reclaimed after init.

__start_mcount_loc[] is generated during the load portion
of kernel build, and is used only by ftrace_init().  ftrace_init is declared
'__init' and is in .init.text, which is freed after init.
__start_mcount_loc is placed into .rodata by a call to MCOUNT_REC inside
the RO_DATA macro of include/asm-generic/vmlinux.lds.h.  The array *is*
read-only, but more importantly it is not used after init.  So the call to
MCOUNT_REC should be moved from RO_DATA to INIT_DATA.

This patch has been tested on x86_64 with CONFIG_DEBUG_PAGEALLOC=y
which verifies that the address range never is accessed after init.

Signed-off-by: John Reiser <jreiser@...Wagon.com>
LKML-Reference: <4A6DF0B6.7080402@...wagon.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>


---
 include/asm-generic/vmlinux.lds.h |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 6ad76bf..98b37cf 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -91,7 +91,8 @@
 #endif
 
 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
-#define MCOUNT_REC()	VMLINUX_SYMBOL(__start_mcount_loc) = .; \
+#define MCOUNT_REC()	. = ALIGN(8);				\
+			VMLINUX_SYMBOL(__start_mcount_loc) = .; \
 			*(__mcount_loc)				\
 			VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 #else
@@ -331,7 +332,6 @@
 	/* __*init sections */						\
 	__init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {		\
 		*(.ref.rodata)						\
-		MCOUNT_REC()						\
 		DEV_KEEP(init.rodata)					\
 		DEV_KEEP(exit.rodata)					\
 		CPU_KEEP(init.rodata)					\
@@ -455,6 +455,7 @@
 	MEM_DISCARD(init.data)						\
 	KERNEL_CTORS()							\
 	*(.init.rodata)							\
+	MCOUNT_REC()							\
 	DEV_DISCARD(init.rodata)					\
 	CPU_DISCARD(init.rodata)					\
 	MEM_DISCARD(init.rodata)
--
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