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From devnull@lkml.org Sun May 19 17:18:16 2024 Delivery-date: Thu, 23 Feb 2006 17:58:56 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932142AbWBWQ6F (ORCPT ); Thu, 23 Feb 2006 11:58:05 -0500 Received: from spirit.analogic.com ([204.178.40.4]:61452 "EHLO spirit.analogic.com") by vger.kernel.org with ESMTP id S932070AbWBWQ6D convert rfc822-to-8bit (ORCPT ); Thu, 23 Feb 2006 11:58:03 -0500 Received: from chaos.analogic.com ([10.112.50.11]) by phoenix.analogic.com with Microsoft SMTPSVC(6.0.3790.211); Thu, 23 Feb 2006 11:57:42 -0500 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Received: from chaos.analogic.com (localhost [127.0.0.1]) by chaos.analogic.com (8.12.11/8.12.11) with ESMTP id k1NGvbOf014778; Thu, 23 Feb 2006 11:57:37 -0500 Received: (from linux-os@localhost) by chaos.analogic.com (8.12.11/8.12.11/Submit) id k1NGvbwt014777; Thu, 23 Feb 2006 11:57:37 -0500 In-Reply-To: <1140707358.4672.67.camel@laptopd505.fenrus.org> X-OriginalArrivalTime: 23 Feb 2006 16:57:42.0928 (UTC) FILETIME=[43256100:01C6389A] content-class: urn:content-classes:message Subject: Re: Patch to reorder functions in the vmlinux to a defined order Date: Thu, 23 Feb 2006 11:57:37 -0500 Message-Id: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Patch to reorder functions in the vmlinux to a defined order Thread-Index: AcY4mkMxWVReTGHvR+udaKRAdiPE6Q== References: <1140700758.4672.51.camel@laptopd505.fenrus.org> <1140707358.4672.67.camel@laptopd505.fenrus.org> From: "linux-os \(Dick Johnson\)" To: "Arjan van de Ven" Cc: , , , , Reply-To: "linux-os \(Dick Johnson\)" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org 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 > > --- > 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 @@ > +*(.text.flush_thread) > +*(.text.check_poison_obj) > +*(.text.copy_page) > +*(.text.__set_personality) > +*(.text.gart_map_sg) > 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+*(.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. _  **************************************************************** The information transmitted in this message is confidential and may be privileged. Any review, retransmission, dissemination, or other use of this information by persons or entities other than the intended recipient is prohibited. If you are not the intended recipient, please notify Analogic Corporation immediately - by replying to this message or by sending an email to DeliveryErrors@analogic.com - and destroy all copies of this information, including any attachments, without reading or disclosing them. Thank you. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/