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Optimize the ordering of sections in RW_DATA_SECTION. 

The old RW_DATA_SECTION had INIT_TASK_DATA (which was
more-than-PAGE_SIZE-aligned), followed by a bunch of small alignment
stuff, followed by more PAGE_SIZE-aligned stuff, so you wasted memory
in the middle of .data re-aligning back up to PAGE_SIZE.

This patch sorts the sections by alignment requirements, which should
pack them essentially optimally.

Signed-off-by: Tim Abbott <tabbott@ksplice.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tim Abbott 2009-09-24 10:36:16 -04:00 committed by Linus Torvalds
parent e9ea0e2d1d
commit 1b2086227c
1 changed files with 2 additions and 2 deletions
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4
include/asm-generic/vmlinux.lds.h
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@ -721,12 +721,12 @@
. = ALIGN(PAGE_SIZE); \
.data : AT(ADDR(.data) - LOAD_OFFSET) { \
INIT_TASK_DATA(inittask) \
NOSAVE_DATA \
PAGE_ALIGNED_DATA(pagealigned) \
CACHELINE_ALIGNED_DATA(cacheline) \
READ_MOSTLY_DATA(cacheline) \
DATA_DATA \
CONSTRUCTORS \
NOSAVE_DATA \
PAGE_ALIGNED_DATA(pagealigned) \
}
#define INIT_TEXT_SECTION(inittext_align) \