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author | Arjan van de Ven <arjan@infradead.org> | 2006-03-25 16:30:49 +0100 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-25 09:10:56 -0800 |
commit | 4bdc3b7f1b730c07f5a6ccca77ee68e044036ffc (patch) | |
tree | 58e79b7865d4d4660711f7f8a2a3cc2ec91e65ec | |
parent | 9b2a13b963dece8d45e07692b7872ae5a075ca2a (diff) |
[PATCH] x86_64: Basic reorder infrastructure
This patch puts the infrastructure in place to allow for a reordering of
functions based inside the vmlinux. The general idea is that it is possible
to put all "common" functions into the first 2Mb of the code, so that they
are covered by one TLB entry. This as opposed to the current situation where
a typical vmlinux covers about 3.5Mb (on x86-64) and thus 2 TLB entries.
This is done by enabling the -ffunction-sections flag in gcc, which puts
each function in its own ELF section, so that the linker can then order them
in a way defined by the linker script.
As per previous discussions, Linus said he wanted a "static" list for this,
eg a list provided by the kernel tarbal, so that most people have the same
ordering at least. A script is provided to create this list based on
readprofile(1) output. The included list is provisional, and entirely biased
on my own testbox and me running a few kernel compiles and some other
things.
I think that to get to a better list we need to invite people to submit
their own profiles, and somehow add those all up and base the final list on
that. I'm willing to do that effort if this is ends up being the prefered
approach. Such an effort probably needs to be repeated like once a year or
so to adopt to the changing nature of the kernel.
Made it a CONFIG with default n because it increases link times
dramatically.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r-- | arch/x86_64/Kconfig | 8 | ||||
-rw-r--r-- | arch/x86_64/Makefile | 1 | ||||
-rw-r--r-- | arch/x86_64/kernel/functionlist | 1286 | ||||
-rw-r--r-- | arch/x86_64/kernel/vmlinux.lds.S | 5 | ||||
-rw-r--r-- | scripts/profile2linkerlist.pl | 21 |
5 files changed, 1321 insertions, 0 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig index 9fad9df86626..24a3016c079d 100644 --- a/arch/x86_64/Kconfig +++ b/arch/x86_64/Kconfig @@ -464,6 +464,14 @@ config SECCOMP source kernel/Kconfig.hz +config REORDER + bool "Function reordering" + default n + help + This option enables the toolchain to reorder functions for a more + optimal TLB usage. If you have pretty much any version of binutils, + this can increase your kernel build time by roughly one minute. + endmenu # diff --git a/arch/x86_64/Makefile b/arch/x86_64/Makefile index f5e48ba9bec7..0fbc0283609c 100644 --- a/arch/x86_64/Makefile +++ b/arch/x86_64/Makefile @@ -36,6 +36,7 @@ CFLAGS += -m64 CFLAGS += -mno-red-zone CFLAGS += -mcmodel=kernel CFLAGS += -pipe +cflags-$(CONFIG_REORDER) += -ffunction-sections # this makes reading assembly source easier, but produces worse code # actually it makes the kernel smaller too. CFLAGS += -fno-reorder-blocks diff --git a/arch/x86_64/kernel/functionlist b/arch/x86_64/kernel/functionlist new file mode 100644 index 000000000000..2bcebdc3eedb --- /dev/null +++ b/arch/x86_64/kernel/functionlist @@ -0,0 +1,1286 @@ +*(.text.flush_thread) +*(.text.check_poison_obj) +*(.text.copy_page) +*(.text.__set_personality) +*(.text.gart_map_sg) +*(.text.kmem_cache_free) +*(.text.find_get_page) +*(.text._raw_spin_lock) +*(.text.ide_outb) +*(.text.unmap_vmas) +*(.text.copy_page_range) +*(.text.kprobe_handler) +*(.text.__handle_mm_fault) +*(.text.__d_lookup) +*(.text.copy_user_generic) +*(.text.__link_path_walk) +*(.text.get_page_from_freelist) +*(.text.kmem_cache_alloc) +*(.text.drive_cmd_intr) +*(.text.ia32_setup_sigcontext) +*(.text.huge_pte_offset) +*(.text.do_page_fault) +*(.text.page_remove_rmap) +*(.text.release_pages) +*(.text.ide_end_request) +*(.text.__mutex_lock_slowpath) +*(.text.__find_get_block) +*(.text.kfree) +*(.text.vfs_read) +*(.text._raw_spin_unlock) 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