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avg 96691e46d1 fix a thread preemption regression in schedulers introduced in r270423 
Commit r270423 fixed a regression in sched_yield() that was introduced
in earlier changes.  Unfortunately, at the same time it introduced an
new regression.  The problem is that SWT_RELINQUISH (6), like all other
SWT_* constants and unlike SW_* flags, is not a bit flag.  So, (flags &
SWT_RELINQUISH) is true in cases where that was not really indended,
for example, with SWT_OWEPREEMPT (2) and SWT_REMOTEPREEMPT (11).

A straight forward fix would be to use (flags & SW_TYPE_MASK) ==
SWT_RELINQUISH, but my impression is that the switch types are designed
mostly for gathering statistics, not for influencing scheduling
decisions.

So, I decided that it would be better to check for SW_PREEMPT flag
instead.  That's also the same flag that was checked before r239157.
I double-checked how that flag is used and I am confident that the flag
is set only in the places where we really have the preemption:
- critical_exit + td_owepreempt
- sched_preempt in the ULE scheduler
- sched_preempt in the 4BSD scheduler

Reviewed by:	kib, mav
MFC after:	4 days
Sponsored by:	Panzura
Differential Revision: https://reviews.freebsd.org/D9230
2017-01-19 18:46:41 +00:00
..
bus_if.m
"Buses" is the preferred plural of "bus"
2017-01-15 17:54:01 +00:00
capabilities.conf
Update capabilities.conf comment
2016-09-08 14:04:04 +00:00
clock_if.m
…
cpufreq_if.m
…
device_if.m
Import the 'iflib' API library for network drivers. From the author:
2016-05-18 04:35:58 +00:00
genassym.sh
genassym.sh: call nm(1) with NMFLAGS.
2015-08-14 22:57:13 +00:00
imgact_aout.c
Implement vsyscall hack. Prior to 2.13 glibc uses vsyscall
2016-01-09 20:18:53 +00:00
imgact_binmisc.c
sys/kern: spelling fixes in comments.
2016-04-29 22:15:33 +00:00
imgact_elf32.c
…
imgact_elf64.c
…
imgact_elf.c
Style.
2016-10-04 15:23:03 +00:00
imgact_gzip.c
…
imgact_shell.c
…
inflate.c
ANSIfy inflate.c
2016-10-04 17:57:30 +00:00
init_main.c
Fix improper use of "its".
2016-11-08 23:59:41 +00:00
init_sysent.c
Regen after r310638.
2016-12-27 20:22:17 +00:00
kern_acct.c
Revert r312119 and reword the intent to fix -Wshadow issues
2017-01-15 09:25:33 +00:00
kern_alq.c
Use SI_SUB_LAST instead of SI_SUB_SMP as the "catch-all" subsystem.
2016-03-11 23:18:06 +00:00
kern_clock.c
Initialize 'ticks' earlier in boot after 'hz' is set.
2016-11-22 01:02:59 +00:00
kern_clocksource.c
Add an EARLY_AP_STARTUP option to start APs earlier during boot.
2016-05-14 18:22:52 +00:00
kern_condvar.c
cv: do a lockless check for no waiters in cv_signal and cv_broadcastpri
2016-09-06 17:16:59 +00:00
kern_conf.c
Undo r309891. Konstantin is right in that this condition normally
2016-12-12 19:11:04 +00:00
kern_cons.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
kern_context.c
…
kern_cpu.c
Add an EARLY_AP_STARTUP option to start APs earlier during boot.
2016-05-14 18:22:52 +00:00
kern_cpuset.c
Add more fine-grained kernel options for NUMA support.
2016-04-09 13:58:04 +00:00
kern_ctf.c
Fix improper use of "its".
2016-11-08 23:59:41 +00:00
kern_descrip.c
Remove deprecated fgetsock() and fputsock().
2017-01-13 22:16:41 +00:00
kern_dtrace.c
…
kern_dump.c
Add support for encrypted kernel crash dumps.
2016-12-10 16:20:39 +00:00
kern_environment.c
Create wrappers for uint64_t and int64_t for the tunables. While not
2016-04-15 03:09:55 +00:00
kern_et.c
Add labels to sysctls related to clocks.
2016-12-14 12:56:58 +00:00
kern_event.c
Add kevent EVFILT_EMPTY for notification when a client has received all data
2017-01-16 08:25:33 +00:00
kern_exec.c
Explicitely add "opt_compat.h" to kern_exec.c: fix powerpc LINT builds.
2017-01-06 16:56:24 +00:00
kern_exit.c
When a zombie gets reparented due to the parent exit, send SIGCHLD to
2016-12-12 11:11:50 +00:00
kern_fail.c
Fix some cosmetic issues in kern_fail.c omitted from r296927.
2016-06-09 13:17:08 +00:00
kern_ffclock.c
kernel: use our nitems() macro when it is available through param.h.
2016-04-19 23:48:27 +00:00
kern_fork.c
vfs: add vrefact, to be used when the vnode has to be already active
2016-12-12 15:37:11 +00:00
kern_gzio.c
…
kern_hhook.c
Get closer to a VIMAGE network stack teardown from top to bottom rather
2016-06-21 13:48:49 +00:00
kern_idle.c
…
kern_intr.c
…
kern_jail.c
Move IPv4-specific jail functions to new file netinet/in_jail.c
2016-08-09 02:16:21 +00:00
kern_khelp.c
…
kern_kthread.c
Re-schedule signals after kthread exits, since apparently there are
2016-08-10 13:47:12 +00:00
kern_ktr.c
Fix the logic in the ddb command 'show ktr /a'. Prior to r118269 it would
2016-01-31 17:32:20 +00:00
kern_ktrace.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
kern_linker.c
kern_linker: Handle module-loading failures in preloaded .ko files
2016-10-13 02:06:23 +00:00
kern_lock.c
Microoptimize locking primitives by avoiding unnecessary atomic ops.
2016-06-01 18:32:20 +00:00
kern_lockf.c
Fix LINT building.
2016-09-18 07:37:00 +00:00
kern_lockstat.c
…
kern_loginclass.c
Speed up rctl operation with large rulesets, by holding the lock
2015-11-15 12:10:51 +00:00
kern_malloc.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
kern_mbuf.c
Import the 'iflib' API library for network drivers. From the author:
2016-05-18 04:35:58 +00:00
kern_mib.c
Mark a bunch of mpsafe sysctls as such.
2016-10-19 19:42:01 +00:00
kern_module.c
Provide better debug message on kernel module name clash.
2015-10-10 09:21:55 +00:00
kern_mtxpool.c
sys/kern: spelling fixes in comments.
2016-04-29 22:15:33 +00:00
kern_mutex.c
mtx: plug open-coded mtx_lock access missed in r311172
2017-01-04 02:25:31 +00:00
kern_ntptime.c
Fix a bug in r302252.
2016-07-27 11:40:06 +00:00
kern_numa.c
…
kern_osd.c
osd(9): Change array pointer to array pointer type from void*
2016-04-26 19:57:35 +00:00
kern_physio.c
Add four new RCTL resources - readbps, readiops, writebps and writeiops,
2016-04-07 04:23:25 +00:00
kern_pmc.c
…
kern_poll.c
…
kern_priv.c
…
kern_proc.c
Export the whole thread name in kinfo_proc
2016-12-07 15:04:22 +00:00
kern_procctl.c
reaper: Make REAPER_KILL_SUBTREE actually work.
2016-12-14 22:49:20 +00:00
kern_prot.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
kern_racct.c
Get rid of rctl_lock; use racct_lock where appropriate. The fast paths
2016-04-21 16:22:52 +00:00
kern_rangelock.c
…
kern_rctl.c
sys/kern: spelling fixes in comments.
2016-04-29 22:15:33 +00:00
kern_resource.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
kern_rmlock.c
sys/kern: spelling fixes in comments.
2016-04-29 22:15:33 +00:00
kern_rwlock.c
rwlock: reduce lock accesses similarly to r311172
2017-01-18 17:53:57 +00:00
kern_sdt.c
…
kern_sema.c
…
kern_sendfile.c
Move bogus_page declaration to vm_page.h and initialization to vm_page.c.
2017-01-04 22:27:19 +00:00
kern_sharedpage.c
Split kerne timekeep ABI structure vdso_sv_tk out of the struct
2015-11-23 07:09:35 +00:00
kern_shutdown.c
Stop the scheduler upon panic even in non-SMP kernels.
2017-01-14 22:16:03 +00:00
kern_sig.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
kern_switch.c
…
kern_sx.c
sx: reduce lock accesses similarly to r311172
2017-01-18 17:55:08 +00:00
kern_synch.c
disambiguate msleep KASSERT diagnostics
2017-01-16 20:34:42 +00:00
kern_syscalls.c
…
kern_sysctl.c
Document the existence of the {0, 6, ...} sysctl.
2016-12-15 15:45:11 +00:00
kern_tc.c
Add labels to sysctls related to clocks.
2016-12-14 12:56:58 +00:00
kern_thr.c
thr_set_name(): silently truncate the given name as needed
2016-12-03 01:14:21 +00:00
kern_thread.c
Rewrite subr_sleepqueue.c use of callouts to not depend on the
2016-07-28 09:09:55 +00:00
kern_time.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
kern_timeout.c
Permit timed sleeps for threads other than thread0 before timers are working.
2016-11-25 18:02:43 +00:00
kern_umtx.c
[mips] make UMTX_CHAINS configurable at compile time.
2016-11-15 01:34:38 +00:00
kern_uuid.c
…
kern_xxx.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
ksched.c
Use P1B_PRIO_MAX to designate max posix priority for the RR/FIFO
2015-08-30 18:02:57 +00:00
link_elf_obj.c
sys/kern: spelling fixes in comments.
2016-04-29 22:15:33 +00:00
link_elf.c
kern: for pointers replace 0 with NULL.
2016-04-15 16:10:11 +00:00
linker_if.m
sys/kern: spelling fixes in comments.
2016-04-29 22:15:33 +00:00
Make.tags.inc
Bring the tags and links entries for amd64 up to date.
2015-10-27 22:59:24 +00:00
Makefile
Don't create pointless backups of generated files in "make sysent".
2016-07-28 21:29:04 +00:00
makesyscalls.sh
makesyscalls.sh: remove trailing space on the "created from" line
2016-10-17 13:52:24 +00:00
md4c.c
crypto routines: Hint minimum buffer sizes to the compiler
2016-05-26 19:29:29 +00:00
md5c.c
crypto routines: Hint minimum buffer sizes to the compiler
2016-05-26 19:29:29 +00:00
msi_if.m
Introduce MSI and MSI-X support to intrng. This adds a new msi device
2016-05-16 09:11:40 +00:00
p1003_1b.c
…
pic_if.m
INTRNG: Rework handling with resources. Partially revert r301453.
2016-08-19 10:52:39 +00:00
posix4_mib.c
posix4_mib: Don't overrun facility_initialized array
2016-04-27 00:10:32 +00:00
sched_4bsd.c
fix a thread preemption regression in schedulers introduced in r270423
2017-01-19 18:46:41 +00:00
sched_ule.c
fix a thread preemption regression in schedulers introduced in r270423
2017-01-19 18:46:41 +00:00
serdev_if.m
…
stack_protector.c
…
subr_acl_nfs4.c
Expose an interface to determine if an ACE is inherited.
2015-09-04 00:14:20 +00:00
subr_acl_posix1e.c
…
subr_autoconf.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
subr_blist.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
subr_bufring.c
…
subr_bus_dma.c
Fix a bug introduced in r291716:
2016-01-11 20:38:39 +00:00
subr_bus.c
"Buses" is the preferred plural of "bus"
2017-01-15 17:54:01 +00:00
subr_busdma_bufalloc.c
Fix printf format to allow for bus_size_t not being u_long on all platforms.
2015-10-20 03:25:17 +00:00
subr_capability.c
capsicum: plug spurious memset in __cap_rights_init
2015-12-01 02:48:42 +00:00
subr_clock.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
subr_counter.c
Zero return value when counter_rate() switches over to next second and
2016-12-13 20:11:45 +00:00
subr_devmap.c
Include machine/acle-compat.h in cdefs.h on arm if the compiler doesn't
2016-05-25 19:44:26 +00:00
subr_devstat.c
Add support for managing Shingled Magnetic Recording (SMR) drives.
2016-05-19 14:08:36 +00:00
subr_disk.c
…
subr_dummy_vdso_tc.c
…
subr_eventhandler.c
…
subr_fattime.c
…
subr_firmware.c
Fix improper use of "its".
2016-11-08 23:59:41 +00:00
subr_gtaskqueue.c
Remove Assert that seems to be hit in various configurations during
2017-01-16 19:01:41 +00:00
subr_hash.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
subr_hints.c
…
subr_intr.c
INTRNG - fix MSI/MSIX release path
2016-10-11 17:00:29 +00:00
subr_kdb.c
…
subr_kobj.c
…
subr_lock.c
Implement trivial backoff for locking primitives.
2016-08-01 21:48:37 +00:00
subr_log.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
subr_mbpool.c
sys/kern: spelling fixes in comments.
2016-04-29 22:15:33 +00:00
subr_mchain.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
subr_module.c
preload_search_info: make sure mod is set
2015-08-21 15:57:57 +00:00
subr_msgbuf.c
sys/kern: spelling fixes in comments.
2016-04-29 22:15:33 +00:00
subr_param.c
Initialize 'ticks' earlier in boot after 'hz' is set.
2016-11-22 01:02:59 +00:00
subr_pcpu.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
subr_pctrie.c
sys: extend use of the howmany() macro when available.
2016-04-26 15:38:17 +00:00
subr_power.c
…
subr_prf.c
Include <stdarg.h> instead of <machine/stdarg.h> when compiled as
2016-10-24 18:03:04 +00:00
subr_prof.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
subr_rman.c
Add new bus methods for mapping resources.
2016-05-20 17:57:47 +00:00
subr_rtc.c
Make resettodr_lock accessible outside subr_rtc.c. Protect
2016-09-21 10:15:08 +00:00
subr_sbuf.c
Fail the sbuf if vsnprintf(3) fails.
2015-10-02 09:23:14 +00:00
subr_scanf.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
subr_sfbuf.c
…
subr_sglist.c
Add sglist functions for working with arrays of VM pages.
2016-05-20 23:28:43 +00:00
subr_sleepqueue.c
Add a comment explaining the race fixed by r310423.
2016-12-23 05:02:17 +00:00
subr_smp.c
Handle broadcast NMIs.
2016-10-24 16:40:27 +00:00
subr_stack.c
Add support for a configurable output channel to witness(4).
2015-11-19 05:56:59 +00:00
subr_syscall.c
Add PROC_TRAPCAP procctl(2) controls and global sysctl kern.trap_enocap.
2016-09-21 08:23:33 +00:00
subr_taskqueue.c
While draining a timeout task prevent the taskqueue_enqueue_timeout()
2016-09-29 10:38:20 +00:00
subr_terminal.c
…
subr_trap.c
The assertion re-added in r302614 was triggered when stopping signal
2016-07-18 10:53:47 +00:00
subr_turnstile.c
ddb(4): Add sleepchains to "show allchains"
2016-10-22 18:02:20 +00:00
subr_uio.c
In the fueword64(9) wrapper for architectures which do not implemented
2016-10-23 11:23:17 +00:00
subr_unit.c
Clean up trailing whitespace
2017-01-14 04:16:13 +00:00
subr_vmem.c
subr_vmem: Fix double-free in error case of vmem_create
2016-05-11 23:16:11 +00:00
subr_witness.c
Fix WITNESS hints for pagequeue locks.
2016-10-29 20:01:48 +00:00
sys_capability.c
capsicum: perform copyout without the fildesc lock held in sys_cap_ioctls_get
2016-10-21 16:12:23 +00:00
sys_generic.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
sys_pipe.c
Generate syscall tables and update pipe() implementation after r302094.
2016-06-22 21:18:19 +00:00
sys_procdesc.c
Hide the boottime and bootimebin globals, provide the getboottime(9)
2016-07-27 11:08:59 +00:00
sys_process.c
Don't set P2_PTRACE_FSTP in a process that invokes ptrace(PT_TRACE_ME).
2016-08-19 17:57:14 +00:00
sys_socket.c
Set MORETOCOME for AIO write requests on a socket.
2017-01-06 23:41:45 +00:00
syscalls.c
Regen after r310638.
2016-12-27 20:22:17 +00:00
syscalls.master
Rename the 'flags' argument to getfsstat() to 'mode' and validate it.
2016-12-27 20:21:11 +00:00
systrace_args.c
Regen after r310638.
2016-12-27 20:22:17 +00:00
sysv_ipc.c
…
sysv_msg.c
Remove a comment that was part of copied code, and is misleading in
2016-06-09 15:34:33 +00:00
sysv_sem.c
sys/kern: spelling fixes in comments.
2016-04-29 22:15:33 +00:00
sysv_shm.c
Add shmatt_t.
2016-07-26 17:23:49 +00:00
tty_compat.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
tty_info.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
tty_inq.c
Check tty_gone() after allocating IO buffers. The tty lock has to be
2017-01-13 16:37:38 +00:00
tty_outq.c
Check tty_gone() after allocating IO buffers. The tty lock has to be
2017-01-13 16:37:38 +00:00
tty_pts.c
sys/kern: spelling fixes in comments.
2016-04-29 22:15:33 +00:00
tty_tty.c
…
tty_ttydisc.c
Don't clear the software flow control flag before draining for last
2016-01-26 14:46:39 +00:00
tty.c
Correct the comments about how much buffer is allocated.
2017-01-13 17:03:23 +00:00
uipc_accf.c
Use correct size type in do_setopt_accept_filter
2016-10-12 00:56:49 +00:00
uipc_debug.c
Refactor the AIO subsystem to permit file-type-specific handling and
2016-03-01 18:12:14 +00:00
uipc_domain.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
uipc_mbuf2.c
Remove writability requirement for single-mbuf, contiguous-range
2017-01-12 06:38:03 +00:00
uipc_mbuf.c
Suppress a warning about m_assertbuf being unused.
2017-01-15 03:53:20 +00:00
uipc_mbufhash.c
…
uipc_mqueue.c
Initialize reserved bytes in struct mq_attr and its 32compat
2016-11-14 13:20:10 +00:00
uipc_sem.c
Clean up some style(9) violations.
2016-04-14 17:07:26 +00:00
uipc_shm.c
When tmpfs and POSIX shm pagein a page for the sole purpose of performing
2016-12-11 19:24:41 +00:00
uipc_sockbuf.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
uipc_socket.c
Implement kernel support for hardware rate limited sockets.
2017-01-18 13:31:17 +00:00
uipc_syscalls.c
Rework r306337.
2016-10-21 18:27:30 +00:00
uipc_usrreq.c
Add a new socket option SO_TS_CLOCK to pick from several different clock
2017-01-16 17:46:38 +00:00
vfs_acl.c
…
vfs_aio.c
Remove duplicated code.
2016-08-17 10:14:22 +00:00
vfs_bio.c
Do not set BIO_DONE if the BIO specifies a completion handler.
2017-01-10 21:41:28 +00:00
vfs_cache.c
cache: sprinkle __predict_false
2016-12-29 16:35:49 +00:00
vfs_cluster.c
Move bogus_page declaration to vm_page.h and initialization to vm_page.c.
2017-01-04 22:27:19 +00:00
vfs_default.c
Do not allocate struct statfs on kernel stack.
2017-01-05 17:19:26 +00:00
vfs_export.c
Fix build when no INET and INET6 in kernel config.
2016-11-17 16:13:30 +00:00
vfs_extattr.c
…
vfs_hash.c
Add vfs_hash_ref(9) function, which finds a vnode by the hash value
2016-05-11 06:32:22 +00:00
vfs_init.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
vfs_lookup.c
Fix bug that would result in a kernel crash in some cases involving
2017-01-04 14:43:57 +00:00
vfs_mount.c
Do not allocate struct statfs on kernel stack.
2017-01-05 17:19:26 +00:00
vfs_mountroot.c
Limit scope of the optimization in r306608 to dounmount() caller only.
2016-10-07 11:38:28 +00:00
vfs_subr.c
vfs: switch nodes_created, recycles_count and free_owe_inact to counter(9)
2016-12-31 19:59:31 +00:00
vfs_syscalls.c
Do not allocate struct statfs on kernel stack.
2017-01-05 17:19:26 +00:00
vfs_vnops.c
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
vnode_if.src
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00