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freebsd-dev/sys/kern
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Konstantin Belousov 391aba32e6 mnt_vnode_next_active: use conventional lock order when trylock fails. 
Previously, when the VI_TRYLOCK failed, we would spin under the mutex
that protects the vnode active list until we either succeeded or
noticed that we had hogged the CPU. Since we were violating the lock
order, this would guarantee that we would become a hog under any
deadlock condition (e.g. a race with vdrop(9) on the same vnode). In
the presence of many concurrent threads in sync(2) or vdrop etc, the
victim could hang for a long time.

Now, avoid spinning by dropping and reacquiring the locks in the
conventional lock order when the trylock fails. This requires a dance
with the vnode hold count.

Submitted by:	Tom Rix <trix@juniper.net>
Tested by:	pho
Differential revision:	https://reviews.freebsd.org/D10692
2017-05-15 10:02:45 +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 Don't prefix zero with 0x in assym.s. 2017-04-13 15:43:44 +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 tighten buffer bounds in imgact_binmisc_populate_interp 2017-03-21 18:02:14 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c Add support for capturing 'struct ptrace_lwpinfo' for signals 2017-03-30 18:21:36 +00:00
imgact_gzip.c
imgact_shell.c
inflate.c ANSIfy inflate.c 2016-10-04 17:57:30 +00:00
init_main.c Bump struct thread alignment to 32. 2017-02-07 17:03:22 +00:00
init_sysent.c Hook up new audit event identifiers for various non-Orange Book/CAPP 2017-03-29 22:33:56 +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 Remove cpu_deepest_sleep variable. 2017-02-24 16:11:55 +00:00
kern_condvar.c Introduce SCHEDULER_STOPPED_TD for use when the thread pointer was already read 2017-02-17 06:45:04 +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 Extend cpuset_get/setaffinity() APIs 2017-05-03 18:41:08 +00:00
kern_ctf.c Fix improper use of "its". 2016-11-08 23:59:41 +00:00
kern_descrip.c kern_descrip: Move kinfo_ofile size assert under COMPAT_FREEBSD7 2017-04-07 05:00:09 +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 Use designated initializers for kevent_copyops. 2017-03-14 09:25:01 +00:00
kern_exec.c Apply MADV_FREE to exec_map entries only after a lowmem event. 2017-02-15 01:50:58 +00:00
kern_exit.c Avoid reusing p_ksi while it is on queue. 2017-03-12 13:58:51 +00:00
kern_fail.c kern_fail: Allow sleeping for more than 2147483/hz seconds 2017-03-21 22:41:37 +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 - Remove 'struct vmmeter' from 'struct pcpu', leaving only global vmmeter 2017-04-17 17:34:47 +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 Extend cpuset_get/setaffinity() APIs 2017-05-03 18:41:08 +00:00
kern_jail.c Use inet_ntoa_r() instead of inet_ntoa() throughout the kernel 2017-02-16 20:47:41 +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 Ktracing kevent(2) calls with unusual arguments might leads to an 2017-03-12 13:48:24 +00:00
kern_linker.c In linker_load_file() print name of a file that failed to load. 2017-03-09 00:56:07 +00:00
kern_lock.c lockmgr: implement fast path 2017-02-12 09:49:44 +00:00
kern_lockf.c put very expensive sanity checks of advisory locks under DIAGNOSTIC 2017-01-30 15:20:13 +00:00
kern_lockstat.c mtx: microoptimize lockstat handling in __mtx_lock_sleep 2017-02-17 14:55:59 +00:00
kern_loginclass.c
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 All these files need sys/vmmeter.h, but now they got it implicitly 2017-04-17 17:07:00 +00:00
kern_module.c
kern_mtxpool.c sys/kern: spelling fixes in comments. 2016-04-29 22:15:33 +00:00
kern_mutex.c KDTRACE_HOOKS isn't guaranteed to be defined. Change to check to see 2017-02-24 01:39:08 +00:00
kern_ntptime.c ANSIfy kern_ntptime.c 2017-01-25 20:22:32 +00:00
kern_numa.c Remove unneeded include of vm_phys.h. 2017-04-17 16:51:04 +00:00
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 Cast values to (int) before comparing them to the range of the 2017-02-24 01:39:12 +00:00
kern_poll.c
kern_priv.c
kern_proc.c Use atop() instead of OFF_TO_IDX() for convertion of addresses or 2017-03-14 19:39:17 +00:00
kern_procctl.c reaper: Make REAPER_KILL_SUBTREE actually work. 2016-12-14 22:49:20 +00:00
kern_prot.c proc: perform a lockless check in sys_issetugid 2017-01-24 21:48:57 +00:00
kern_racct.c try to fix RACCT_RSS accounting 2017-02-14 13:54:05 +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 Corrected misspelled versions of rendezvous. 2017-04-09 02:00:03 +00:00
kern_rwlock.c locks: ensure proper barriers are used with atomic ops when necessary 2017-03-01 05:06:21 +00:00
kern_sdt.c
kern_sema.c
kern_sendfile.c Make sendfile(2) more robust against file change. This fixes a possible 2017-03-24 16:01:19 +00:00
kern_sharedpage.c
kern_shutdown.c Fix compilation of r314784 on 32 bit. 2017-03-06 22:32:56 +00:00
kern_sig.c Do not wake up sleeping thread in reschedule_signals() if the signal 2017-05-12 15:34:59 +00:00
kern_switch.c Add comments explaining unobvious td_critnest adjustments in 2017-01-22 19:41:42 +00:00
kern_sx.c locks: ensure proper barriers are used with atomic ops when necessary 2017-03-01 05:06:21 +00:00
kern_synch.c - Remove 'struct vmmeter' from 'struct pcpu', leaving only global vmmeter 2017-04-17 17:34:47 +00:00
kern_syscalls.c
kern_sysctl.c Print out name of non-dynamic sysctl in sysctl_remove_oid_locked 2017-03-22 05:27:20 +00:00
kern_tc.c Add missing pieces of r315280 2017-03-14 22:02:02 +00:00
kern_thr.c Defer ptracestop() signals that cannot be delivered immediately 2017-02-20 15:53:16 +00:00
kern_thread.c Add asserts to verify stability of struct proc and struct thread layouts. 2017-04-27 21:24:50 +00:00
kern_time.c Add clock_nanosleep() 2017-03-19 00:51:12 +00:00
kern_timeout.c When draining a callout, don't clear CALLOUT_ACTIVE while it is running. 2017-03-15 00:29:27 +00:00
kern_umtx.c When the RTC is adjusted, reevaluate absolute sleep times based on the RTC 2017-03-14 19:06:44 +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
link_elf_obj.c Reduce stack usage in link_elf_load_file(), allocating struct nameidata. 2017-03-09 00:45:15 +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
Makefile Don't create pointless backups of generated files in "make sysent". 2016-07-28 21:29:04 +00:00
makesyscalls.sh Remove SVR4 (System V Release 4) binary compatibility support. 2017-02-28 05:14:42 +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 move thread switch tracing from mi_switch to sched_switch 2017-03-23 08:57:04 +00:00
sched_ule.c move thread switch tracing from mi_switch to sched_switch 2017-03-23 08:57:04 +00:00
serdev_if.m
stack_protector.c
subr_acl_nfs4.c
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
subr_capability.c capsicum: plug spurious memset in __cap_rights_init 2015-12-01 02:48:42 +00:00
subr_clock.c Use time_t for intermediate values to avoid overflow in clock_ts_to_ct 2017-01-24 18:05:29 +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 Extend cpuset_get/setaffinity() APIs 2017-05-03 18:41:08 +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 - Remove 'struct vmmeter' from 'struct pcpu', leaving only global vmmeter 2017-04-17 17:34:47 +00:00
subr_kdb.c
subr_kobj.c - Also outside of the KOBJOPLOOKUP macro - which in turn is used by 2017-05-08 21:08:39 +00:00
subr_lock.c locks: follow up r313386 2017-02-07 16:01:07 +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
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 Provide a comment on why stdio.h needs to be included. 2017-02-28 21:27:51 +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
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_sfbus.c need sys/proc.h for struct thread definition. 2017-02-07 17:31:24 +00:00
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 missing pieces of r315280 2017-03-14 22:02:02 +00:00
subr_smp.c Corrected misspelled versions of rendezvous. 2017-04-09 02:00:03 +00:00
subr_stack.c
subr_syscall.c - Remove 'struct vmmeter' from 'struct pcpu', leaving only global vmmeter 2017-04-17 17:34:47 +00:00
subr_taskqueue.c Implement taskqueue_poll_is_busy() for use by the LinuxKPI. 2017-03-02 12:20:23 +00:00
subr_terminal.c Oops, my fix for bright colors broke bright black some more (in cases 2017-03-27 10:48:28 +00:00
subr_trap.c - Remove 'struct vmmeter' from 'struct pcpu', leaving only global vmmeter 2017-04-17 17:34:47 +00:00
subr_turnstile.c ddb(4): Add sleepchains to "show allchains" 2016-10-22 18:02:20 +00:00
subr_uio.c Switch copyout_map() to use vm_mmap_object() instead of vm_mmap(). 2017-02-12 20:54:31 +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 Make witness_warn() always print to the console. 2017-02-05 02:27:04 +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 Fix NULL pointer dereference and panic with shm file pread/pwrite. 2017-03-10 10:09:44 +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 Add support for capturing 'struct ptrace_lwpinfo' for signals 2017-03-30 18:21:36 +00:00
sys_socket.c Set MORETOCOME for AIO write requests on a socket. 2017-01-06 23:41:45 +00:00
syscalls.c Regenerate syscall files for r315526 2017-03-19 00:54:24 +00:00
syscalls.master Change the size argument of __getcwd() to size_t. 2017-04-06 23:40:13 +00:00
systrace_args.c Regen after r316594. 2017-04-06 23:40:51 +00:00
sysv_ipc.c
sysv_msg.c Audit arguments to System V IPC system calls implementing sempahores, 2017-03-30 22:26:15 +00:00
sysv_sem.c Audit arguments to System V IPC system calls implementing sempahores, 2017-03-30 22:26:15 +00:00
sysv_shm.c Audit arguments to System V IPC system calls implementing sempahores, 2017-03-30 22:26:15 +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 m_mbuftouio() doesn't modify the mbuf. 2017-03-07 19:00:50 +00:00
uipc_mbufhash.c
uipc_mqueue.c Audit arguments to POSIX message queues, semaphores, and shared memory. 2017-03-31 13:43:00 +00:00
uipc_sem.c Audit arguments to POSIX message queues, semaphores, and shared memory. 2017-03-31 13:43:00 +00:00
uipc_shm.c Audit arguments to POSIX message queues, semaphores, and shared memory. 2017-03-31 13:43:00 +00:00
uipc_sockbuf.c Fix the build. 2017-04-14 10:21:38 +00:00
uipc_socket.c Remove unnecessary check for NULL mbuf in soreceive_generic(). 2017-04-25 19:54:34 +00:00
uipc_syscalls.c Add kern_listen(), kern_shutdown(), and kern_socket(), and use them 2017-01-30 12:57:22 +00:00
uipc_usrreq.c For non-listening AF_UNIX sockets return error code EOPNOTSUPP to match 2017-01-25 22:26:45 +00:00
vfs_acl.c Add system-call argument auditing for ACL-related system calls. 2017-03-30 22:00:58 +00:00
vfs_aio.c Rework r313352. 2017-02-13 09:04:38 +00:00
vfs_bio.c Make it possible to terminate "show lockedbufs" by pressing "q". 2017-04-23 22:20:25 +00:00
vfs_cache.c cache: stop holding the ncneg_hot lock across purging 2017-05-04 03:11:59 +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 Relax the locking requirements for vm_object_page_noreuse(). While 2017-03-15 17:43:45 +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 Use UMA_ALIGN_PTR instead of sizeof(void *) for zone alignment. 2017-03-15 18:23:32 +00:00
vfs_mount.c Do not allocate struct statfs on kernel stack. 2017-01-05 17:19:26 +00:00
vfs_mountroot.c Make root_mount_hold() work after boot. This is important for two 2017-02-06 20:44:34 +00:00
vfs_subr.c mnt_vnode_next_active: use conventional lock order when trylock fails. 2017-05-15 10:02:45 +00:00
vfs_syscalls.c Audit arguments to posix_fallocate(2) and posix_fadvise(2) system calls. 2017-03-31 14:17:14 +00:00
vfs_vnops.c Apply noexec mount option for mmap(PROT_EXEC). 2017-02-19 20:51:04 +00:00
vnode_if.src Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00