Subject: Patch to reorder functions in the vmlinux to a defined order
From: Arjan van de Ven <arjan@linux.intel.com>
To: linux-kernel@vger.kernel.org, ak@suse.de
Cc: torvalds@osdl.org, akpm@osdl.org, mingo@elte.hu
In-Reply-To: <1140700758.4672.51.camel@laptopd505.fenrus.org>
References: <1140700758.4672.51.camel@laptopd505.fenrus.org>
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Date: Thu, 23 Feb 2006 16:09:17 +0100
Message-Id: <1140707358.4672.67.camel@laptopd505.fenrus.org>
Mime-Version: 1.0
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 36696
Lines: 1385

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 patch depends on the previous patch to pin head.S as first in the order)

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.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>

---
 arch/x86_64/Makefile             |    1 
 arch/x86_64/kernel/vmlinux.lds.S |    5 
 scripts/functionlist             | 1286 +++++++++++++++++++++++++++++++++++++++
 scripts/profile2linkerlist.pl    |   21 
 4 files changed, 1313 insertions(+)

Index: linux-2.6.16-reorder/arch/x86_64/Makefile
===================================================================
--- linux-2.6.16-reorder.orig/arch/x86_64/Makefile
+++ linux-2.6.16-reorder/arch/x86_64/Makefile
@@ -35,6 +35,7 @@ CFLAGS += -m64
 CFLAGS += -mno-red-zone
 CFLAGS += -mcmodel=kernel
 CFLAGS += -pipe
+CFLAGS += -ffunction-sections
 # this makes reading assembly source easier, but produces worse code
 # actually it makes the kernel smaller too.
 CFLAGS += -fno-reorder-blocks	
Index: linux-2.6.16-reorder/arch/x86_64/kernel/vmlinux.lds.S
===================================================================
--- linux-2.6.16-reorder.orig/arch/x86_64/kernel/vmlinux.lds.S
+++ linux-2.6.16-reorder/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 "../../../scripts/functionlist"
+	/* Then the rest */
 	*(.text)
 	SCHED_TEXT
 	LOCK_TEXT
Index: linux-2.6.16-reorder/scripts/functionlist
===================================================================
--- /dev/null
+++ linux-2.6.16-reorder/scripts/functionlist
@@ -0,0 +1,1286 @@
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+*(.text.proc_lookupfd)
+*(.text.proc_delete_inode)
+*(.text.posix_same_owner)
+*(.text.posix_block_lock)
+*(.text.poll_initwait)
+*(.text.pipe_write)
+*(.text.pipe_read_fasync)
+*(.text.pipe_ioctl)
+*(.text.pdflush)
+*(.text.pci_user_read_config_dword)
+*(.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)
Index: linux-2.6.16-reorder/scripts/profile2linkerlist.pl
===================================================================
--- /dev/null
+++ linux-2.6.16-reorder/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";
+  }
+}

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