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3d2a3ff25e
freebsd-dev/sys/kern
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Bosko Milekic 3d2a3ff25e Optimize the way reference counting is performed with Mbufs. We 
do not need to perform an extra memory fetch in the Packet (Mbuf+Cluster)
constructor to initialize the reference counter anymore.  The reference
counts are located in a separate memory region (in the slab header,
because this zone is UMA_ZONE_REFCNT), so the memory fetch resulted very
often in a cache miss.  Additionally, and perhaps more significantly,
optimize the free mbuf+cluster (packet) case, which is very common, to
no longer require an atomic operation on free (to verify the reference
counter) if the reference on the cluster has never been increased (also
very common).  Reduces an atomic on mbuf free on average.

Original patch submitted by: Gerrit Nagelhout <gnagelhout@sandvine.com>
2005-02-10 22:23:02 +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 Add an interface for cpufreq. The kernel interface lets other drivers 2005-02-04 05:38:30 +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 o Split out kernel part of execve(2) syscall into two parts: one that 2005-01-29 23:12:00 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c o Split out kernel part of execve(2) syscall into two parts: one that 2005-01-29 23:12:00 +00:00
imgact_gzip.c o Split out kernel part of execve(2) syscall into two parts: one that 2005-01-29 23:12:00 +00:00
imgact_shell.c Fix build on AMD64 (and probably other arches where size_t != int). 2005-01-30 06:43:17 +00:00
inflate.c
init_main.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
init_sysent.c - Regen 2005-01-26 02:29:18 +00:00
kern_acct.c In acct_process(), do a lockless read of acctvp to see if it's NULL 2005-01-08 04:45:57 +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 /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_clock.c - Define KTR points for KTR_SCHED. 2004-12-26 00:14:21 +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 Use MAXMINOR 2005-01-29 16:50:04 +00:00
kern_context.c Change the clear_ret argument of get_mcontext() to be a flags argument. 2003-11-09 20:31:04 +00:00
kern_cpu.c Add support for relative cpufreq drivers. Such drivers modulate clock 2005-02-06 21:08:35 +00:00
kern_descrip.c Make some file/filedesc related functions static 2005-02-10 12:27:58 +00:00
kern_environment.c Make a bunch of malloc types static. 2005-02-10 12:02:37 +00:00
kern_event.c Make a bunch of malloc types static. 2005-02-10 12:02:37 +00:00
kern_exec.c Grrr, this committer needs to have a sleep. Remove lines from the previous 2005-01-29 23:51:05 +00:00
kern_exit.c In 1.276 of kern/subr_trap.c I introduced a mechanism for delaying 2005-01-29 14:03:41 +00:00
kern_fork.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_idle.c Set the scheduling class of the idle threads to PRI_IDLE. 2005-02-04 06:16:05 +00:00
kern_intr.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_jail.c Add a new sysctl, "security.jail.chflags_allowed", which controls the 2005-02-08 21:31:11 +00:00
kern_kse.c o Split out kernel part of execve(2) syscall into two parts: one that 2005-01-29 23:12:00 +00:00
kern_kthread.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_ktr.c - Change the ddb paging "support" to use a variable (db_lines_per_page) to 2004-11-01 22:15:15 +00:00
kern_ktrace.c Make a SYSCTL_NODE static 2005-02-10 12:23:29 +00:00
kern_linker.c When trying each linker class in turn with a preloaded module, exit 2004-08-27 01:20:26 +00:00
kern_lock.c - Include LK_INTERLOCK in LK_EXTFLG_MASK so that it makes its way into 2005-01-25 16:06:05 +00:00
kern_lockf.c - Make lf_print static and move its prototype into kern_lockf.c 2005-01-25 10:15:26 +00:00
kern_mac.c Bump MAC Framework version to 2 in preparation for the upcoming API/ABI 2004-11-09 11:28:40 +00:00
kern_malloc.c Bring in MemGuard, a very simple and small replacement allocator 2005-01-21 18:09:17 +00:00
kern_mbuf.c Optimize the way reference counting is performed with Mbufs. We 2005-02-10 22:23:02 +00:00
kern_mib.c Fix spelling of integer in a comment. 2005-01-30 00:31:19 +00:00
kern_module.c Add a 32bit syscall wrapper for modstat 2005-01-19 17:53:06 +00:00
kern_mtxpool.c Make a bunch of malloc types static. 2005-02-10 12:02:37 +00:00
kern_mutex.c Rework the optimization for spinlocks on UP to be slightly less drastic and 2005-01-05 21:13:27 +00:00
kern_ntptime.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_physio.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_poll.c Add a NULL param to an mi_switch() that I missed. 2004-07-03 02:38:03 +00:00
kern_proc.c Make a bunch of SYSCTL_NODEs static. 2005-02-10 12:15:49 +00:00
kern_prot.c Style cleanup: with removal of mutex operations, we can also remove 2005-01-23 21:11:39 +00:00
kern_resource.c Stop explicitly touching td_base_pri outside of the scheduler and simply 2004-12-30 20:29:58 +00:00
kern_sema.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_shutdown.c Replace a printf with a KASSERT that we are indeed running on the BSP. 2004-11-30 06:21:38 +00:00
kern_sig.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_subr.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_switch.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_sx.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_synch.c Stop explicitly touching td_base_pri outside of the scheduler and simply 2004-12-30 20:29:58 +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 Put on my peril sensitive sunglasses and add a flags field to the internal 2004-10-11 22:04:16 +00:00
kern_thr.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_thread.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_time.c If the pointer to the new itimerval is NULL in kern_setitimer(), just 2005-02-07 21:45:48 +00:00
kern_timeout.c Add a mechanism for associating a mutex with a callout when the 2005-02-07 02:47:33 +00:00
kern_umtx.c Revert my previous errno hack, that is certainly an issue, 2005-01-18 13:53:10 +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 Remove the namespace column from the syscalls tables. We don't actually 2003-12-23 03:50:43 +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 /* -> /*- for license, minor formatting changes 2005-01-07 02:29:27 +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 Rework the interface between priority propagation (lending) and the 2004-12-30 20:52:44 +00:00
sched_ule.c - Add ke_runq == NULL to the conditions which will cause us to abort 2005-02-04 17:22:46 +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 Maxunit is inclusive so fix off-by-one in previous commit. 2005-02-08 18:03:17 +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 /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_disk.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_eventhandler.c Use 'const char *' for a few prototypes. 2004-12-06 10:53:40 +00:00
subr_hints.c
subr_kdb.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_kobj.c
subr_log.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +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 /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +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 Update for the KDB framework: 2004-07-10 21:43:23 +00:00
subr_prof.c - Move TDF_OWEPREEMPT, TDF_OWEUPC, and TDF_USTATCLOCK over to td_pflags 2004-07-16 21:04:55 +00:00
subr_rman.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +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 Make a bunch of malloc types static. 2005-02-10 12:02:37 +00:00
subr_smp.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_taskqueue.c Add taskqueue_drain. This waits for the specified task to finish, if 2004-10-05 04:16:01 +00:00
subr_trap.c Whitespace fix. 2004-12-30 20:30:58 +00:00
subr_turnstile.c Make a bunch of malloc types static. 2005-02-10 12:02:37 +00:00
subr_unit.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_witness.c When DDB is not defined, don't implement witness_thread_has_locks() and 2005-01-22 21:14:21 +00:00
sys_generic.c Declare "cnt" (a number of bytes to read or write) as an "ssize_t", not 2005-02-10 20:19:17 +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 /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
sys_socket.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
syscalls.c - Regen for recent vfs syscall changes. 2005-01-24 10:50:42 +00:00
syscalls.master - Struct mount is not yet locked well enough to allow 2005-01-26 02:28:43 +00:00
sysv_ipc.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
sysv_msg.c - Tweak kern_msgctl() to return a copy of the requested message queue id 2005-02-07 18:44:55 +00:00
sysv_sem.c Invoke label initialization, creation, cleanup, and tear-down MAC 2005-01-22 19:04:17 +00:00
sysv_shm.c Invoke label initialization, creation, cleanup, and tear-down MAC 2005-01-22 19:10:25 +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 /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
tty_pty.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
tty_subr.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
tty_tty.c Second half of the dev_t cleanup. 2004-06-17 17:16:53 +00:00
tty.c Call tty_close() at the very end of ttyclose() since otherwise NULL 2004-12-30 19:24:49 +00:00
uipc_accf.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
uipc_cow.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +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 Optimize the way reference counting is performed with Mbufs. We 2005-02-10 22:23:02 +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 /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
uipc_sockbuf.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
uipc_socket2.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
uipc_socket.c - Convert so_qlen, so_incqlen, so_qlimit fields of struct socket from 2005-01-24 12:20:21 +00:00
uipc_syscalls.c Extend kern_sendit() to take another enum uio_seg argument, which specifies 2005-01-30 07:20:36 +00:00
uipc_usrreq.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +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 Make a SYSCTL_NODE static 2005-02-10 12:23:29 +00:00
vfs_bio.c Make various vnode related functions static 2005-02-10 12:28:58 +00:00
vfs_cache.c Make a SYSCTL_NODE and a mutex static 2005-02-10 12:16:42 +00:00
vfs_cluster.c make cluster_callback() static 2005-02-10 12:17:48 +00:00
vfs_default.c Remove vop_stddestroyvobject() 2005-02-07 09:26:39 +00:00
vfs_export.c Make various mountpoint related functions static. 2005-02-10 12:25:38 +00:00
vfs_extattr.c Drag another softupdates tentacle back into FFS: Now that FFS's 2005-02-08 18:09:11 +00:00
vfs_init.c Make various mountpoint related functions static. 2005-02-10 12:25:38 +00:00
vfs_lookup.c - Tweak kern_msgctl() to return a copy of the requested message queue id 2005-02-07 18:44:55 +00:00
vfs_mount.c Make various mountpoint related functions static. 2005-02-10 12:25:38 +00:00
vfs_subr.c Make various vnode related functions static 2005-02-10 12:28:58 +00:00
vfs_syscalls.c Drag another softupdates tentacle back into FFS: Now that FFS's 2005-02-08 18:09:11 +00:00
vfs_vnops.c Don't call VOP_CREATEVOBJECT(), it's the responsibility of the 2005-01-24 23:53:54 +00:00
vnode_if.src VOP_DESTROYVOBJECT() is no more. 2005-02-07 09:26:58 +00:00