Re: Patch to reorder functions in the vmlinux to a defined order

[linux-os (Dick Johnson)]

On Thu, 23 Feb 2006, Arjan van de Ven wrote:

> 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@xxxxxxxxxxxxxxx>
>
> ---
> 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
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> +*(.text.058)
> +*(.text.tcp_xmit_probe_skb)
> +*(.text.tcp_v4_send_check)
> +*(.text.tcp_v4_destroy_sock)
> +*(.text.tcp_sync_mss)
> +*(.text.tcp_snd_test)
> +*(.text.tcp_slow_start)
> +*(.text.tcp_send_fin)
> +*(.text.tcp_rtt_estimator)
> +*(.text.tcp_parse_options)
> +*(.text.tcp_ioctl)
> +*(.text.tcp_init_tso_segs)
> +*(.text.tcp_init_cwnd)
> +*(.text.tcp_getsockopt)
> +*(.text.tcp_fin)
> +*(.text.tcp_connect)
> +*(.text.tcp_cong_avoid)
> +*(.text.__tcp_checksum_complete_user)
> +*(.text.task_dumpable)
> +*(.text.sys_wait4)
> +*(.text.sys_utimes)
> +*(.text.sys_symlinkat)
> +*(.text.sys_socketpair)
> +*(.text.sys_rmdir)
> +*(.text.sys_readahead)
> +*(.text.sys_nanosleep)
> +*(.text.sys_linkat)
> +*(.text.sys_fstat)
> +*(.text.sysfs_readdir)
> +*(.text.sys_execve)
> +*(.text.sysenter_tracesys)
> +*(.text.sys_chown)
> +*(.text.stub_clone)
> +*(.text.strrchr)
> +*(.text.strncpy)
> +*(.text.stopmachine_set_state)
> +*(.text.sock_sendmsg)
> +*(.text.sock_release)
> +*(.text.sock_fasync)
> +*(.text.sock_close)
> +*(.text.sk_stream_write_space)
> +*(.text.sk_reset_timer)
> +*(.text.skb_split)
> +*(.text.skb_recv_datagram)
> +*(.text.skb_queue_tail)
> +*(.text.sk_attach_filter)
> +*(.text.si_swapinfo)
> +*(.text.simple_strtoll)
> +*(.text.set_termios)
> +*(.text.set_task_comm)
> +*(.text.set_shrinker)
> +*(.text.set_normalized_timespec)
> +*(.text.set_brk)
> +*(.text.serial_in)
> +*(.text.seq_printf)
> +*(.text.secure_dccp_sequence_number)
> +*(.text.rwlock_bug)
> +*(.text.rt_hash_code)
> +*(.text.__rta_fill)
> +*(.text.__request_resource)
> +*(.text.relocate_new_kernel)
> +*(.text.release_thread)
> +*(.text.release_mem)
> +*(.text.rb_prev)
> +*(.text.rb_first)
> +*(.text.random_poll)
> +*(.text.__put_super_and_need_restart)
> +*(.text.pty_write)
> +*(.text.ptrace_stop)
> +*(.text.proc_self_readlink)
> +*(.text.proc_root_lookup)
> +*(.text.proc_root_link)
> +*(.text.proc_pid_make_inode)
> +*(.text.proc_pid_attr_write)
> +*(.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";
> +  }
> +}
>
> -

This is the dumbest thing I've seen in recent years! You should
put all the stuff you want to hit with one TLB in a __single__
section and relocate that section!

Cheers,
Dick Johnson
Penguin : Linux version 2.6.15.4 on an i686 machine (5589.54 BogoMips).
Warning : 98.36% of all statistics are fiction.
_


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