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authorArjan van de Ven <arjan@infradead.org>2006-03-25 16:30:49 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-25 09:10:56 -0800
commit4bdc3b7f1b730c07f5a6ccca77ee68e044036ffc (patch)
tree58e79b7865d4d4660711f7f8a2a3cc2ec91e65ec /arch
parent9b2a13b963dece8d45e07692b7872ae5a075ca2a (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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86_64/Kconfig8
-rw-r--r--arch/x86_64/Makefile1
-rw-r--r--arch/x86_64/kernel/functionlist1286
-rw-r--r--arch/x86_64/kernel/vmlinux.lds.S5
4 files changed, 1300 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 @@
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+*(.text.page_readlink)
+*(.text.null_lseek)
+*(.text.nf_hook_slow)
+*(.text.netlink_sock_destruct)
+*(.text.netlink_broadcast)
+*(.text.neigh_resolve_output)
+*(.text.name_to_int)
+*(.text.mwait_idle)
+*(.text.mutex_trylock)
+*(.text.mutex_debug_check_no_locks_held)
+*(.text.m_stop)
+*(.text.mpage_end_io_write)
+*(.text.mpage_alloc)
+*(.text.move_page_tables)
+*(.text.mounts_open)
+*(.text.__memset)
+*(.text.memcpy_fromiovec)
+*(.text.make_8259A_irq)
+*(.text.lookup_user_key_possessed)
+*(.text.lookup_create)
+*(.text.locks_insert_lock)
+*(.text.locks_alloc_lock)
+*(.text.kthread_should_stop)
+*(.text.kswapd)
+*(.text.kobject_uevent)
+*(.text.kobject_get_path)
+*(.text.kobject_get)
+*(.text.klist_children_put)
+*(.text.__ip_route_output_key)
+*(.text.ip_flush_pending_frames)
+*(.text.ip_compute_csum)
+*(.text.ip_append_data)
+*(.text.ioc_set_batching)
+*(.text.invalidate_inode_pages)
+*(.text.__invalidate_device)
+*(.text.install_arg_page)
+*(.text.in_sched_functions)
+*(.text.inotify_unmount_inodes)
+*(.text.init_once)
+*(.text.init_cdrom_command)
+*(.text.inet_stream_connect)
+*(.text.inet_sk_rebuild_header)
+*(.text.inet_csk_addr2sockaddr)
+*(.text.inet_create)
+*(.text.ifind)
+*(.text.ide_setup_dma)
+*(.text.ide_outsw)
+*(.text.ide_fixstring)
+*(.text.ide_dma_setup)
+*(.text.ide_cdrom_packet)
+*(.text.ide_cd_put)
+*(.text.ide_build_sglist)
+*(.text.i8259A_shutdown)
+*(.text.hung_up_tty_ioctl)
+*(.text.hrtimer_nanosleep)
+*(.text.hrtimer_init)
+*(.text.hrtimer_cancel)
+*(.text.hash_futex)
+*(.text.group_send_sig_info)
+*(.text.grab_cache_page_nowait)
+*(.text.get_wchan)
+*(.text.get_stack)
+*(.text.get_page_state)
+*(.text.getnstimeofday)
+*(.text.get_node)
+*(.text.get_kprobe)
+*(.text.generic_unplug_device)
+*(.text.free_task)
+*(.text.frag_show)
+*(.text.find_next_zero_string)
+*(.text.filp_open)
+*(.text.fillonedir)
+*(.text.exit_io_context)
+*(.text.exit_idle)
+*(.text.exact_lock)
+*(.text.eth_header)
+*(.text.dummy_unregister_security)
+*(.text.dummy_socket_post_create)
+*(.text.dummy_socket_listen)
+*(.text.dummy_quota_on)
+*(.text.dummy_inode_follow_link)
+*(.text.dummy_file_receive)
+*(.text.dummy_file_mprotect)
+*(.text.dummy_file_lock)
+*(.text.dummy_file_ioctl)
+*(.text.dummy_bprm_post_apply_creds)
+*(.text.do_writepages)
+*(.text.__down_interruptible)
+*(.text.do_notify_resume)
+*(.text.do_acct_process)
+*(.text.del_timer_sync)
+*(.text.default_rebuild_header)
+*(.text.d_callback)
+*(.text.dcache_readdir)
+*(.text.ctrl_dumpfamily)
+*(.text.cpuset_rmdir)
+*(.text.copy_strings_kernel)
+*(.text.con_write_room)
+*(.text.complete_all)
+*(.text.collect_sigign_sigcatch)
+*(.text.clear_user)
+*(.text.check_unthrottle)
+*(.text.cdrom_release)
+*(.text.cdrom_newpc_intr)
+*(.text.cdrom_ioctl)
+*(.text.cdrom_check_status)
+*(.text.cdev_put)
+*(.text.cdev_add)
+*(.text.cap_ptrace)
+*(.text.cap_bprm_secureexec)
+*(.text.cache_alloc_refill)
+*(.text.bmap)
+*(.text.blk_run_queue)
+*(.text.blk_queue_dma_alignment)
+*(.text.blk_ordered_req_seq)
+*(.text.blk_backing_dev_unplug)
+*(.text.__bitmap_subset)
+*(.text.__bitmap_and)
+*(.text.bio_unmap_user)
+*(.text.__bforget)
+*(.text.bd_forget)
+*(.text.bad_pipe_w)
+*(.text.bad_get_user)
+*(.text.audit_free)
+*(.text.anon_vma_ctor)
+*(.text.anon_pipe_buf_map)
+*(.text.alloc_sock_iocb)
+*(.text.alloc_fdset)
+*(.text.aio_kick_handler)
+*(.text.__add_entropy_words)
+*(.text.add_disk_randomness)
diff --git a/arch/x86_64/kernel/vmlinux.lds.S b/arch/x86_64/kernel/vmlinux.lds.S
index 029be20accef..39ff0708f803 100644
--- a/arch/x86_64/kernel/vmlinux.lds.S
+++ b/arch/x86_64/kernel/vmlinux.lds.S
@@ -20,7 +20,12 @@ SECTIONS
phys_startup_64 = startup_64 - LOAD_OFFSET;
_text = .; /* Text and read-only data */
.text : AT(ADDR(.text) - LOAD_OFFSET) {
+ /* First the code that has to be first for bootstrapping */
*(.bootstrap.text)
+ /* Then all the functions that are "hot" in profiles, to group them
+ onto the same hugetlb entry */
+ #include "functionlist"
+ /* Then the rest */
*(.text)
SCHED_TEXT
LOCK_TEXT