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Revision e8a03feb54ca7f1768bbdc2b491f9ef654e6d01d authored by Rik van Riel on 14 April 2010, 21:59:28 UTC, committed by Linus Torvalds on 19 April 2010, 23:28:20 UTC 
rmap: add exclusively owned pages to the newest anon_vma
 
The recent anon_vma fixes cause many anonymous pages to end up
in the parent process anon_vma, even when the page is exclusively
owned by the current process.

Adding exclusively owned anonymous pages to the top anon_vma
reduces rmap scanning overhead, especially in workloads with
forking servers.

This patch adds a parameter to __page_set_anon_rmap that can
be used to indicate whether or not the added page is exclusively
owned by the current process.

Pages added through page_add_new_anon_rmap are exclusively
owned by the current process, and can be added to the top
anon_vma.

Pages added through page_add_anon_rmap can be either shared
or exclusively owned, so we do the conservative thing and
add it to the oldest anon_vma.

A next step would be to add the exclusive parameter to
page_add_anon_rmap, to be used from functions where we do
know for sure whether a page is exclusively owned.

Signed-off-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
Lightly-tested-by: Borislav Petkov <bp@alien8.de>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
[ Edited to look nicer  - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 9b030e2
Raw File
Makefile 
#
# Makefile for the linux kernel.
#

obj-y                          := main.o version.o mounts.o
ifneq ($(CONFIG_BLK_DEV_INITRD),y)
obj-y                          += noinitramfs.o
else
obj-$(CONFIG_BLK_DEV_INITRD)   += initramfs.o
endif
obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o

mounts-y			:= do_mounts.o
mounts-$(CONFIG_BLK_DEV_RAM)	+= do_mounts_rd.o
mounts-$(CONFIG_BLK_DEV_INITRD)	+= do_mounts_initrd.o
mounts-$(CONFIG_BLK_DEV_MD)	+= do_mounts_md.o

# dependencies on generated files need to be listed explicitly
$(obj)/version.o: include/generated/compile.h

# compile.h changes depending on hostname, generation number, etc,
# so we regenerate it always.
# mkcompile_h will make sure to only update the
# actual file if its content has changed.

       chk_compile.h = :
 quiet_chk_compile.h = echo '  CHK     $@'
silent_chk_compile.h = :
include/generated/compile.h: FORCE
	@$($(quiet)chk_compile.h)
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
	"$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CC) $(KBUILD_CFLAGS)"
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