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| author | Ingo Molnar <mingo@elte.hu> | 2008-03-03 12:38:52 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-26 17:44:55 +0200 |
| commit | 60a3cdd0639473c79c253bc08c8ef8f882cca107 (patch) | |
| tree | e72a5ca87873b286b02966a390277f828139d350 /arch/x86/Kconfig.debug | |
| parent | b1721d0da266b4af8cb4419473b4ca36206ab200 (diff) | |
| download | kernel_goldelico_gta04-60a3cdd0639473c79c253bc08c8ef8f882cca107.zip kernel_goldelico_gta04-60a3cdd0639473c79c253bc08c8ef8f882cca107.tar.gz kernel_goldelico_gta04-60a3cdd0639473c79c253bc08c8ef8f882cca107.tar.bz2 | |
x86: add optimized inlining
add CONFIG_OPTIMIZE_INLINING=y.
allow gcc to optimize the kernel image's size by uninlining
functions that have been marked 'inline'. Previously gcc was
forced by Linux to always-inline these functions via a gcc
attribute:
#define inline inline __attribute__((always_inline))
Especially when the user has already selected
CONFIG_OPTIMIZE_FOR_SIZE=y this can make a huge difference in
kernel image size (using a standard Fedora .config):
text data bss dec hex filename
5613924 562708 3854336 10030968 990f78 vmlinux.before
5486689 562708 3854336 9903733 971e75 vmlinux.after
that's a 2.3% text size reduction (!).
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/Kconfig.debug')
| -rw-r--r-- | arch/x86/Kconfig.debug | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 239fd9f..5b1979a 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -257,3 +257,16 @@ config CPA_DEBUG Do change_page_attr() self-tests every 30 seconds. endmenu + +config OPTIMIZE_INLINING + bool "Allow gcc to uninline functions marked 'inline'" + default y + help + This option determines if the kernel forces gcc to inline the functions + developers have marked 'inline'. Doing so takes away freedom from gcc to + do what it thinks is best, which is desirable for the gcc 3.x series of + compilers. The gcc 4.x series have a rewritten inlining algorithm and + disabling this option will generate a smaller kernel there. Hopefully + this algorithm is so good that allowing gcc4 to make the decision can + become the default in the future, until then this option is there to + test gcc for this. |