[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>

5 files changed, 1321 insertions, 0 deletions

diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 9fad9df..24a3016 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 f5e48ba..0fbc028 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 0000000..2bcebdc
--- /dev/null
+++ b/arch/x86_64/kernel/functionlist
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+*(.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 029be20..39ff070 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
diff --git a/scripts/profile2linkerlist.pl b/scripts/profile2linkerlist.pl
new file mode 100644
index 0000000..cb4260e
--- /dev/null
+++ b/scripts/profile2linkerlist.pl
@@ -0,0 +1,21 @@
+#!/usr/bin/perl
+
+#
+# Takes a (sorted) output of readprofile and turns it into a list suitable for
+# linker scripts
+#
+# usage:
+#	 readprofile | sort -rn | perl profile2linkerlist.pl > functionlist
+#
+
+while (<>) {
+  my $line = $_;
+
+  $_ =~ /\W*[0-9]+\W*([a-zA-Z\_0-9]+)\W*[0-9]+/;
+
+  if ( ($line =~ /unknown/) || ($line =~ /total/)) {
+
+  } else {
+    print "*(.text.$1)\n";
+  }
+}