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9e879a5ee0
freebsd-nq/sys/kern
History
Jeff Roberson 9e879a5ee0 - Under heavy IO load the buf daemon can run for many hundereds of 
milliseconds due to what is essentially n^2 algorithmic complexity.  This
   change makes the algorithm N*2 instead.  This heavy processing manifested
   itself as skipping in audio and video playback due to the long scheduling
   latencies and contention on giant by pcm.
 - flushbufqueues() is now responsible for flushing multiple buffers
   rather than one at a time.  This allows us to save our progress in the
   list by using a sentinal.  We must do the numdirtywakeup() and
   waitrunningbufspace() here now rather than in buf_daemon().
 - Also add a uio_yield() after we have processed the list once for bufs
   without deps and again for bufs with deps.  This is to release Giant
   and allow any other giant locked code to proceed.

Tested by:	Many users on current@
Revealed by:	schedgraph traces sent by Emil Mikulic & Anthony Ginepro
2005-06-08 20:26:05 +00:00
..
bus_if.m /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
clock_if.m /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
cpufreq_if.m Introduce a new method, cpufreq_drv_type(), that returns the type of the 2005-02-18 00:23:36 +00:00
device_if.m /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
genassym.sh
imgact_aout.c - Neither of our image formats require Giant now that the vm and vfs have 2005-05-03 10:51:38 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c Don't set the default of kern.fallback_elf_brand to FreeBSD for arm, as 2005-05-24 22:21:44 +00:00
imgact_gzip.c - Change the vm_mmap() function to accept an objtype_t parameter specifying 2005-04-01 20:00:11 +00:00
imgact_shell.c Change the way options are parsed on the `#!'-line of a shell-script. Instead 2005-05-28 22:42:41 +00:00
inflate.c
init_main.c Add /rescue/init to the default init_path, before /stand/sysinstall. 2005-02-17 10:00:10 +00:00
init_sysent.c Rebuild generated system call definition files following the addition of 2005-05-30 15:20:21 +00:00
kern_acct.c When mac_check_system_acct() fails, make sure to unlock as well as close 2005-03-01 08:56:13 +00:00
kern_acl.c Rename suser_cred()'s PRISON_ROOT flag to SUSER_ALLOWJAIL. This is 2004-07-26 07:24:04 +00:00
kern_alq.c Modify the alq(9) alq_open() API to accept a file creation mode, rather 2005-04-16 12:12:27 +00:00
kern_clock.c Kernel hooks to support PMC sampling modes. 2005-05-30 06:29:29 +00:00
kern_condvar.c Refine the turnstile and sleep queue interfaces just a bit: 2004-10-12 18:36:20 +00:00
kern_conf.c cdev (still) needs per instance uid/gid/mode 2005-03-31 10:29:57 +00:00
kern_context.c
kern_cpu.c Add debugging prints to all the methods in case there are problems with 2005-04-10 19:11:23 +00:00
kern_descrip.c - Use NAMEI to pickup Giant if we need it in fpcheckstd(). 2005-05-03 10:52:22 +00:00
kern_environment.c My addled brains didn't realize that since vtp points into value, we 2005-03-09 12:16:45 +00:00
kern_event.c Wrap copyin/copyout for kevent so the 32bit wrapper does not have 2005-06-03 23:15:01 +00:00
kern_exec.c This patch addresses a standards violation issue. The standards say a 2005-05-31 19:39:52 +00:00
kern_exit.c Use low level constructs borrowed from interrupt threads to wait for 2005-05-23 23:01:53 +00:00
kern_fork.c Inherit signal mask for child process in fork1(), RELENG_4 and other 2005-04-20 13:14:52 +00:00
kern_idle.c Divorce critical sections from spinlocks. Critical sections as denoted by 2005-04-04 21:53:56 +00:00
kern_intr.c Use PCPU_LAZY_INC() for cnt.v_{intr,trap,syscalls} rather than atomic 2005-04-12 23:18:54 +00:00
kern_jail.c - Use taskqueue_thread rather than taskqueue_swi since our task is going 2005-04-05 08:51:45 +00:00
kern_kse.c Remove thread_upcall_check, it was used to avoid race bug in earlier 2005-05-27 15:57:27 +00:00
kern_kthread.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_ktr.c Modify the alq(9) alq_open() API to accept a file creation mode, rather 2005-04-16 12:12:27 +00:00
kern_ktrace.c Make a SYSCTL_NODE static 2005-02-10 12:23:29 +00:00
kern_linker.c Fix panic when module is compiled in and it is loaded from loader.conf. 2005-05-28 23:20:05 +00:00
kern_lock.c - Differentiate two UPGRADE panics so I have a better idea of what's going 2005-04-12 05:43:03 +00:00
kern_lockf.c Print name of device instead of useless major/minor numbers. 2005-03-29 08:13:01 +00:00
kern_mac.c Get the directory structure correct in a comment. 2005-04-22 19:09:12 +00:00
kern_malloc.c Kernel malloc layers malloc_type allocation over one of two underlying 2005-05-29 13:38:07 +00:00
kern_mbuf.c Well, it seems that I pre-maturely removed the "All rights reserved" 2005-02-16 21:45:59 +00:00
kern_mib.c Add a sysctl that records the amount of physical memory in the machine. 2005-02-28 21:42:56 +00:00
kern_module.c Swap the arguments for CP so we copy the correct source and 2005-02-18 22:14:40 +00:00
kern_mtxpool.c Make a bunch of malloc types static. 2005-02-10 12:02:37 +00:00
kern_mutex.c Add additional newline to debug.mutex.prof.stats header, so that 2005-04-08 14:14:09 +00:00
kern_ntptime.c Explicitly acquire Giant around the ntp_gettime() and assert it in the 2005-05-28 14:34:41 +00:00
kern_physio.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_pmc.c Kernel hooks to support PMC sampling modes. 2005-05-30 06:29:29 +00:00
kern_poll.c Remove recently added note about DEVICE_POLLING not working with SMP. 2005-02-25 22:07:51 +00:00
kern_proc.c Add a sysctl that returns the full path of a process' text file. 2005-04-18 02:10:37 +00:00
kern_prot.c Introduce p_canwait() and MAC Framework and MAC Policy entry points 2005-04-18 13:36:57 +00:00
kern_resource.c Giant is no longer required in kern_setrlimit(); remove its acquisition and 2005-06-01 17:52:51 +00:00
kern_sema.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_shutdown.c - Remove unused include. 2005-04-12 05:45:58 +00:00
kern_sig.c Fix a bug relavant to debugging, a masked signal unexpectedly interrupts 2005-06-06 05:13:10 +00:00
kern_subr.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_switch.c Use low level constructs borrowed from interrupt threads to wait for 2005-05-23 23:01:53 +00:00
kern_sx.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_synch.c Use low level constructs borrowed from interrupt threads to wait for 2005-05-23 23:01:53 +00:00
kern_syscalls.c Do a pass over all modules in the kernel and make them return EOPNOTSUPP 2004-07-15 08:26:07 +00:00
kern_sysctl.c Make another bunch of SYSCTL_NODEs static 2005-02-10 12:16:08 +00:00
kern_tc.c s/ENOTTY/ENOIOCTL/ 2005-03-26 20:04:28 +00:00
kern_thr.c Add new syscall thr_new to create thread in atomic, it will 2005-04-23 02:36:07 +00:00
kern_thread.c Remove sleep queue hack, it is no longer needed with current sleep queue. 2005-05-27 04:27:22 +00:00
kern_time.c Implement kern_adjtime(), kern_readv(), kern_sched_rr_get_interval(), 2005-03-31 22:51:18 +00:00
kern_timeout.c When processing a timeout() callout and returning it to the free 2005-02-11 00:14:00 +00:00
kern_umtx.c Allocate umtx_q from heap instead of stack, this avoids 2005-03-05 09:15:03 +00:00
kern_uuid.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_xxx.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
ksched.c /* -> /*- for license, minor formatting changes 2005-01-07 02:29:27 +00:00
link_elf_obj.c Add support for completing the installation of ELF relocatable 2004-08-29 01:21:51 +00:00
link_elf.c Normalize the VM wiring done with SPARSE_MAPPING: check for errors, and 2004-08-09 18:46:13 +00:00
linker_if.m /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
Make.tags.inc
Makefile
makesyscalls.sh Introduce a new field in the syscalls.master file format to hold the 2005-05-30 15:09:18 +00:00
md4c.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
md5c.c MD5Pad() should never have been exposed. 2005-02-10 12:20:42 +00:00
p1003_1b.c Actually commit the code for kern_sched_get_rr_interval(). 2005-03-31 22:54:48 +00:00
posix4_mib.c Back when VOP_* was introduced, we did not have new-style struct 2004-12-01 23:16:38 +00:00
sched_4bsd.c Bring a working snapshot of hwpmc(4), its associated libraries, userland utilities 2005-04-19 04:01:25 +00:00
sched_ule.c - Fix the case where we're not preempting but there is already a newtd 2005-06-07 02:59:16 +00:00
subr_acl_posix1e.c Rename suser_cred()'s PRISON_ROOT flag to SUSER_ALLOWJAIL. This is 2004-07-26 07:24:04 +00:00
subr_autoconf.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_blist.c Move the definitions of SWAPBLK_NONE and SWAPBLK_MASK from vm_page.h to 2004-06-04 04:03:26 +00:00
subr_bus.c Document that the returned pointer should be freed even if the number 2005-05-20 05:04:22 +00:00
subr_clist.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_clock.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_devstat.c - Remove two mtx_asserts that can incorrectly trigger if 2005-05-03 10:58:05 +00:00
subr_disk.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_eventhandler.c eliminate potential null deref 2005-02-23 19:32:29 +00:00
subr_hints.c Don't set ret_namelen and ret_resnamelen in res_find() unless both the 2005-03-24 21:20:25 +00:00
subr_kdb.c Implement an alternate method to stop CPUs when entering DDB. Normally we use 2005-04-30 20:01:00 +00:00
subr_kobj.c
subr_log.c Use dynamic major number allocation. 2005-02-27 22:02:03 +00:00
subr_mbpool.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_mchain.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_module.c
subr_msgbuf.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_param.c Increase default HZ for sparc64 to 1000. 2005-04-16 15:07:41 +00:00
subr_pcpu.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_power.c Move the kernel power change printf under bootverbose since the 2004-01-02 18:24:13 +00:00
subr_prf.c Make "show msgbuf" use the pager instead of blasting the whole thing out. 2005-06-06 22:18:32 +00:00
subr_prof.c netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
subr_rman.c If we are going to 2005-05-06 02:50:00 +00:00
subr_rtc.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_sbuf.c Make a bunch of malloc types static. 2005-02-10 12:02:37 +00:00
subr_scanf.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_sleepqueue.c Remove thread_upcall_check, it was used to avoid race bug in earlier 2005-05-27 15:57:27 +00:00
subr_smp.c Implement an alternate method to stop CPUs when entering DDB. Normally we use 2005-04-30 20:01:00 +00:00
subr_taskqueue.c o enable shutdown of taskqueue threads; the thread servicing the queue checks 2005-05-01 00:38:11 +00:00
subr_trap.c - Rev 1.83 of kern_lock.c fixes the td_locks assert, reenable it here. 2005-03-28 12:52:46 +00:00
subr_turnstile.c Make a bunch of malloc types static. 2005-02-10 12:02:37 +00:00
subr_unit.c Remove debugging printfs. 2005-03-14 06:51:29 +00:00
subr_witness.c After some input from bde@ and rereading the datasheet use a MTX_SPIN 2005-06-04 23:24:50 +00:00
sys_generic.c Implement kern_adjtime(), kern_readv(), kern_sched_rr_get_interval(), 2005-03-31 22:51:18 +00:00
sys_pipe.c Rearrange the kninit calls for both directions of a pipe so that 2005-01-17 07:56:28 +00:00
sys_process.c Add missing cases for PT_SYSCALL. 2005-03-18 21:22:28 +00:00
sys_socket.c Introduce three additional MAC Framework and MAC Policy entry points to 2005-04-16 18:46:29 +00:00
syscalls.c Rebuild generated system call definition files following the addition of 2005-05-30 15:20:21 +00:00
syscalls.master Introduce a new field in the syscalls.master file format to hold the 2005-05-30 15:09:18 +00:00
sysv_ipc.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
sysv_msg.c Add much needed descriptions for a number of the IPC related sysctl OIDs. 2005-02-12 01:22:39 +00:00
sysv_sem.c Gratuitous renaming of four System V Semaphore MAC Framework entry 2005-06-07 05:03:28 +00:00
sysv_shm.c Actually use the iterating variable in the for loop when trying to avoid 2005-05-12 20:04:48 +00:00
tty_compat.c Put the pre FreeBSD-2.x tty compat code under BURN_BRIDGES. 2004-06-21 22:57:16 +00:00
tty_conf.c Preparation commit for the tty cleanups that will follow in the near 2004-07-15 20:47:41 +00:00
tty_cons.c Use dynamic major number allocation for /dev/console, there is no 2005-02-27 21:52:42 +00:00
tty_pty.c Explicitly hold a reference to the cdev we have just cloned. This 2005-03-31 12:19:44 +00:00
tty_subr.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
tty_tty.c Explicitly hold a reference to the cdev we have just cloned. This 2005-03-31 12:19:44 +00:00
tty.c According to the comment in struct tty, t_modem is optional; hence we should 2005-04-13 13:56:17 +00:00
uipc_accf.c Move the logic implementing retrieval of the SO_ACCEPTFILTER socket option 2005-03-12 12:57:18 +00:00
uipc_cow.c Allow sends sent from non page-aligned userspace addresses to be 2005-06-05 17:13:23 +00:00
uipc_domain.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
uipc_mbuf2.c Make a bunch of malloc types static. 2005-02-10 12:02:37 +00:00
uipc_mbuf.c Change m_uiotombuf so it will accept offset at which data should be copied 2005-05-04 18:55:03 +00:00
uipc_proto.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
uipc_sem.c In sem_forkhook(), don't attempt to generate a copy of the process semaphore 2005-06-08 07:29:22 +00:00
uipc_sockbuf.c In the current world order, each socket has two mutexes: a mutex 2005-05-27 17:16:43 +00:00
uipc_socket2.c In the current world order, each socket has two mutexes: a mutex 2005-05-27 17:16:43 +00:00
uipc_socket.c Allow sends sent from non page-aligned userspace addresses to be 2005-06-05 17:13:23 +00:00
uipc_syscalls.c Change m_uiotombuf so it will accept offset at which data should be copied 2005-05-04 18:55:03 +00:00
uipc_usrreq.c Fix two issues which were missed in FreeBSD-SA-05:08.kmem. 2005-05-07 00:41:36 +00:00
vfs_acl.c Rename suser_cred()'s PRISON_ROOT flag to SUSER_ALLOWJAIL. This is 2004-07-26 07:24:04 +00:00
vfs_aio.c In lio_listio(2) change jobref from an int to a long so that 2005-06-07 05:28:21 +00:00
vfs_bio.c - Under heavy IO load the buf daemon can run for many hundereds of 2005-06-08 20:26:05 +00:00
vfs_cache.c - Change all filesystems and vfs_cache to relock the dvp once the child is 2005-04-13 10:59:09 +00:00
vfs_cluster.c Revert revision 1.164: pmap_qremove() does not require protection by 2005-05-14 05:09:11 +00:00
vfs_default.c - Remove unnecessary spls. 2005-05-01 00:59:34 +00:00
vfs_export.c Handle theoretical case of vfs_export being called with both MNT_DELEXPORT and 2005-05-11 18:25:42 +00:00
vfs_extattr.c Initialize uio_iovcnt to 1 in extattr_list_vp() and extattr_get_vp() 2005-06-08 13:22:10 +00:00
vfs_hash.c Fix bug in vfs_hash_rehash(): use correct bucket. This only affected 2005-04-07 07:54:08 +00:00
vfs_init.c Remove VFS_START(). Its original purpose involved the mfs filesystem, 2005-02-20 23:02:20 +00:00
vfs_lookup.c - Remove a debugging printf that slipped in. 2005-04-13 23:36:28 +00:00
vfs_mount.c devfs_first() return value isn't used, remove it. 2005-05-18 22:05:12 +00:00
vfs_subr.c - Clear OWEINACT prior to calling VOP_INACTIVE to remove the possibility 2005-06-07 22:05:32 +00:00
vfs_syscalls.c Initialize uio_iovcnt to 1 in extattr_list_vp() and extattr_get_vp() 2005-06-08 13:22:10 +00:00
vfs_vnops.c - Stop checking vxthread, we've asserted that it was useless for several 2005-04-27 09:17:11 +00:00
vnode_if.src - Mark the VOPs that require exclusive locks. Those that aren't marked 2005-04-11 15:19:29 +00:00