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5e758b9561
freebsd-dev/sys/kern
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Robert Watson 5e758b9561 Add several aliases for existing clockid_t names to indicate that the 
application wishes to request high precision time stamps be returned:

Alias                           Existing

CLOCK_REALTIME_PRECISE          CLOCK_REALTIME
CLOCK_MONOTONIC_PRECISE         CLOCK_MONOTONIC
CLOCK_UPTIME_PRECISE            CLOCK_UPTIME

Add experimental low-precision clockid_t names corresponding to these
clocks, but implemented using cached timestamps in kernel rather than
a full time counter query.  This offers a minimum update rate of 1/HZ,
but in practice will often be more frequent due to the frequency of
time stamping in the kernel:

New clockid_t name              Approximates existing clockid_t

CLOCK_REALTIME_FAST             CLOCK_REALTIME
CLOCK_MONOTONIC_FAST            CLOCK_MONOTONIC
CLOCK_UPTIME_FAST               CLOCK_UPTIME

Add one additional new clockid_t, CLOCK_SECOND, which returns the
current second without performing a full time counter query or cache
lookup overhead to make sure the cached timestamp is stable.  This is
intended to support very low granularity consumers, such as time(3).

The names, visibility, and implementation of the above are subject
to change, and will not be MFC'd any time soon.  The goal is to
expose lower quality time measurement to applications willing to
sacrifice accuracy in performance critical paths, such as when taking
time stamps for the purpose of rescheduling select() and poll()
timeouts.  Future changes might include retrofitting the time counter
infrastructure to allow the "fast" time query mechanisms to use a
different time counter, rather than a cached time counter (i.e.,
TSC).

NOTE: With different underlying time mechanisms exposed, using
different time query mechanisms in the same application may result in
relative non-monoticity or the appearance of clock stalling for a
single clockid_t, as a cached time stamp queried after a precision
time stamp lookup may be "before" the time returned by the earlier
live time counter query.
2005-11-27 00:55:18 +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 Add a new sysctl, kern.elf[32|64].can_exec_dyn. When set to 1, one can 2005-11-14 22:24:00 +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 Fix a panic which could occur parsing #!-lines in a shell-script. If the 2005-06-19 02:21:03 +00:00
inflate.c Normalize a significant number of kernel malloc type names: 2005-10-31 15:41:29 +00:00
init_main.c Moderate rewrite of kernel ktrace code to attempt to generally improve 2005-11-13 13:27:44 +00:00
init_sysent.c Regen. 2005-11-26 12:45:22 +00:00
kern_acct.c Significant refactoring of the accounting code to improve locking and VFS 2005-11-12 10:45:13 +00:00
kern_acl.c Implement new world order in VFS locking for ACLs. This will remove the 2005-09-17 22:01:14 +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 In watchdog_config enable the software watchdog iff the WD_ACTIVE flag is 2005-10-27 17:22:47 +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 Move the initialization of the devmtx into the mutex_init() function 2005-10-18 18:27:44 +00:00
kern_context.c
kern_cpu.c make saved cpu level stackable. 2005-10-03 06:57:29 +00:00
kern_descrip.c Add the f_msgcount field to the set of struct file fields printed in show 2005-11-10 13:26:29 +00:00
kern_environment.c Reorder statements to avoid accessing unknown memory. 2005-09-26 14:14:55 +00:00
kern_event.c Add in kqueue support to LIO event notification and fix how it handled 2005-10-12 17:51:31 +00:00
kern_exec.c Cleanup some signal interfaces. Now the tdsignal function accepts 2005-11-03 04:49:16 +00:00
kern_exit.c Moderate rewrite of kernel ktrace code to attempt to generally improve 2005-11-13 13:27:44 +00:00
kern_fork.c Moderate rewrite of kernel ktrace code to attempt to generally improve 2005-11-13 13:27:44 +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 Add a swi_remove() function to teardown software interrupt handlers. For 2005-10-26 15:51:05 +00:00
kern_jail.c Push Giant down in jails. Pass the MPSAFE flag to NDINIT, and keep track 2005-09-28 00:30:56 +00:00
kern_kse.c Cleanup some signal interfaces. Now the tdsignal function accepts 2005-11-03 04:49:16 +00:00
kern_kthread.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_ktr.c - Add curthread to the state that ktr is saving. The extra information is 2005-06-10 23:21:29 +00:00
kern_ktrace.c In ktr_getrequest(), acquire ktrace_mtx earlier -- while the race 2005-11-14 19:30:09 +00:00
kern_linker.c Fix a bug in the kernel module runtime linker that made it impossible 2005-10-19 20:40:30 +00:00
kern_lock.c Include kdb.h so that kdb_active is declared regardless of KDB being 2005-10-02 10:03:51 +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 Standard Giant push down operations for the Mandatory Access Control (MAC) 2005-10-04 14:32:58 +00:00
kern_malloc.c Detect memory leaks when memory type is being destroyed. 2005-11-03 13:48:59 +00:00
kern_mbuf.c Fix panic string in last revision. 2005-11-06 16:47:59 +00:00
kern_mib.c mp_ncpus is always (properly) initialized, even on UP kernels, so just use it. 2005-08-21 18:03:31 +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 Move the initialization of the devmtx into the mutex_init() function 2005-10-18 18:27:44 +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 Fail the module loading process if the currently executing kernel 2005-07-30 09:02:42 +00:00
kern_poll.c - Don't pollute opt_global.h with DEVICE_POLLING and introduce 2005-10-05 10:09:17 +00:00
kern_proc.c Moderate rewrite of kernel ktrace code to attempt to generally improve 2005-11-13 13:27:44 +00:00
kern_prot.c Use the refcount API to manage the reference count for user credentials 2005-09-27 18:09:42 +00:00
kern_resource.c Calling setrlimit from 32bit apps could potentially increase certain 2005-11-02 21:18:07 +00:00
kern_sema.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_shutdown.c Don't pretend to be thread0 when calling sync(). 2005-09-22 15:34:15 +00:00
kern_sig.c Make sure only remove one signal by debugger. 2005-11-12 04:22:16 +00:00
kern_subr.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
kern_switch.c In adjustrunqueue(), add code to handle thread migrating case for 2005-08-03 01:23:45 +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
kern_sysctl.c Drop in a WITNESS_WARN into SYSCTL_IN to make sure that we are 2005-08-08 21:06:42 +00:00
kern_tc.c Start time_uptime with 1 instead of 0. 2005-09-19 22:16:31 +00:00
kern_thr.c Cleanup some signal interfaces. Now the tdsignal function accepts 2005-11-03 04:49:16 +00:00
kern_thread.c Add support for queueing SIGCHLD same as other UNIX systems did. 2005-11-08 09:09:26 +00:00
kern_time.c Add several aliases for existing clockid_t names to indicate that the 2005-11-27 00:55:18 +00:00
kern_timeout.c Oops, missed adding the required include. 2005-09-15 20:20:36 +00:00
kern_umtx.c do umtx_wake at userland thread exit address, so that others userland 2005-10-26 06:55:46 +00:00
kern_uuid.c Add parse_uuid() that creates a binary representation of an UUID from 2005-10-07 13:37:10 +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 Handle vm_map_wire()'s failure. 2005-08-28 05:38:40 +00:00
link_elf.c Check to see if the hash table is present in link_elf_lookup_symbol() 2005-10-31 19:17:32 +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 Add a 'sysent' target that depends on the various files built from 2005-07-13 20:50:17 +00:00
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 Move HWPMC_HOOKS into its own opt_hwpmc_hooks.h file. It doesn't merit 2005-06-24 00:16:57 +00:00
sched_ule.c Temporarily disable nice threshold detection code, as it can starve 2005-09-22 01:19:37 +00:00
subr_acl_posix1e.c Implement new world order in VFS locking for ACLs. This will remove the 2005-09-17 22:01:14 +00:00
subr_autoconf.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
subr_blist.c
subr_bus.c When data passed into devctl_notify is NULL, don't print (null). Instead 2005-10-04 22:25:14 +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 - Fix insertions of bios which represent data earlier than anything else 2005-06-15 23:32:07 +00:00
subr_eventhandler.c eliminate potential null deref 2005-02-23 19:32:29 +00:00
subr_hints.c The resource_xxx routines in subr_hints.c are called before and after the 2005-07-31 10:46:55 +00:00
subr_kdb.c Add stoppcbs[] arrays on Alpha and sparc64 and have each CPU save its 2005-11-03 21:08:20 +00:00
subr_kobj.c Export a routine, kobj_machdep_init(), that allows platforms 2005-08-07 02:20:35 +00:00
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 Change API of mb_copy_t in libmchain so that netsmb can handle 2005-07-29 13:22:37 +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 Partially revert revision 1.66, which contained a change that did not 2005-10-14 19:15:10 +00:00
subr_pcpu.c Fix 'show allpcpu' ddb command on non-x86. CPU IDs are in the range 0 .. 2005-11-03 21:06:29 +00:00
subr_power.c General consensus is that it would be even better to run this in a 2005-11-09 16:22:56 +00:00
subr_prf.c Acquire Giant in uprintf() and tprintf() rather than asserting it. In 2005-09-26 08:02:24 +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 Prefer NULL to 0. 2005-11-17 08:56:21 +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
subr_sleepqueue.c Clarify panic message, I parsed the old one 'trying to sleep while sleeping' 2005-11-09 07:28:52 +00:00
subr_smp.c Rename the KDB_STOP_NMI kernel option to STOP_NMI and make it apply to all 2005-10-24 21:04:19 +00:00
subr_stack.c Add 'depth' argument to CTRSTACK() macro, which allows to reduce number 2005-08-29 11:34:08 +00:00
subr_taskqueue.c Use shorter names for the Giant and fast taskqueues so that their names 2005-10-25 19:29:02 +00:00
subr_trap.c Moderate rewrite of kernel ktrace code to attempt to generally improve 2005-11-13 13:27:44 +00:00
subr_turnstile.c Trim a couple of unneeded includes. 2005-09-29 19:13:52 +00:00
subr_unit.c Remove debugging printfs. 2005-03-14 06:51:29 +00:00
subr_witness.c Reorganize the interrupt handling code a bit to make a few things cleaner 2005-10-25 19:48:48 +00:00
sys_generic.c - Add two new system calls: preadv() and pwritev() which are like readv() 2005-07-07 18:17:55 +00:00
sys_pipe.c Fix the recent panics/LORs/hangs created by my kqueue commit by: 2005-07-01 16:28:32 +00:00
sys_process.c Make sure pending SIGCHLD is removed from previous parent when process 2005-11-08 23:28:12 +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 Regen. 2005-11-26 12:45:22 +00:00
syscalls.master Bring in experimental kernel support for POSIX message queue. 2005-11-26 12:42:35 +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 Re-order MAC and DAC checks in shmget() in order to give precedence to 2005-10-04 16:40:20 +00:00
tty_compat.c Make ttsetcompat() static 2005-10-16 20:40:40 +00:00
tty_conf.c
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 Merge the dev_clone and dev_clone_cred event handlers into a single 2005-08-08 19:55:32 +00:00
tty_subr.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
tty_tty.c Merge the dev_clone and dev_clone_cred event handlers into a single 2005-08-08 19:55:32 +00:00
tty.c Revert most of revision 1.235 and fix the problem a different way. We 2005-10-27 16:47:28 +00:00
uipc_accf.c o setsockopt(2) cannot remove accept filter. [1] 2005-06-11 11:59:48 +00:00
uipc_cow.c Previously, nothing prevented the page that was returned by pmap_extract() 2005-10-23 07:41:56 +00:00
uipc_domain.c /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
uipc_mbuf2.c Define four constants, MBUF_{,MEM,CLUSTER,PACKET,TAG}_MEM_NAME, which 2005-07-17 14:04:03 +00:00
uipc_mbuf.c Free only those mbuf+clusters back to the packet zone that were allocated 2005-11-05 19:43:55 +00:00
uipc_mqueue.c Bring in experimental kernel support for POSIX message queue. 2005-11-26 12:42:35 +00:00
uipc_proto.c Use sparse initializers for "struct domain" and "struct protosw", 2005-11-09 13:29:16 +00:00
uipc_sem.c Const-qualify ksem_timedwait's parameter abstime as it's only passed in. 2005-10-18 11:46:24 +00:00
uipc_sockbuf.c Fix a bug in the loop in sonewconn that makes room on the incomplete 2005-11-22 01:55:29 +00:00
uipc_socket2.c Fix a bug in the loop in sonewconn that makes room on the incomplete 2005-11-22 01:55:29 +00:00
uipc_socket.c Retire MT_HEADER mbuf type and change its users to use MT_DATA. 2005-11-02 13:46:32 +00:00
uipc_syscalls.c Reformat socket control messages on input/output for 32bit compatibility 2005-10-31 21:09:56 +00:00
uipc_usrreq.c Correct a number of serious and closely related bugs in the UNIX domain 2005-11-10 16:06:04 +00:00
vfs_acl.c Implement new world order in VFS locking for ACLs. This will remove the 2005-09-17 22:01:14 +00:00
vfs_aio.c In aio_waitcomplete, do not return EAGAIN if no other threads 2005-11-08 23:48:32 +00:00
vfs_bio.c Normalize a significant number of kernel malloc type names: 2005-10-31 15:41:29 +00:00
vfs_cache.c - Fix a leaked reference to a vnode via v_dd. We rely on cache_purge() and 2005-06-17 01:05:13 +00:00
vfs_cluster.c Normalize a significant number of kernel malloc type names: 2005-10-31 15:41:29 +00:00
vfs_default.c In vop_stdpathconf(ap) also default for _PC_NAME_MAX and _PC_PATH_MAX. 2005-08-17 06:59:23 +00:00
vfs_export.c Normalize a significant number of kernel malloc type names: 2005-10-31 15:41:29 +00:00
vfs_extattr.c Implement new world order in VFS locking for extended attributes. This will 2005-09-24 23:47:04 +00:00
vfs_hash.c Normalize a significant number of kernel malloc type names: 2005-10-31 15:41:29 +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 Use correct VFS locking rather than unconditionally grabbing Giant around 2005-09-21 19:49:42 +00:00
vfs_mount.c In nmount() and vfs_donmount(), do not strcmp() the options in the iovec 2005-11-23 20:51:15 +00:00
vfs_subr.c This is a workaround for a complicated issue involving VFS cookies and devfs. 2005-11-09 22:03:50 +00:00
vfs_syscalls.c Implement new world order in VFS locking for extended attributes. This will 2005-09-24 23:47:04 +00:00
vfs_vnops.c - Replace the series of DEBUG_LOCKS hacks which tried to save the vn_lock 2005-08-03 04:48:22 +00:00
vnode_if.src Allow EVFILT_VNODE events to work on every filesystem type, not just 2005-06-09 20:20:31 +00:00