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* Add lockmgr(9) probes to the lockstat DTrace provider.Mark Johnston2019-08-211-0/+8
| | | | | | | | | | | | | | | | | They follow the conventions set by rw and sx lock probes. There is an additional lockstat:::lockmgr-disown probe. Update lockstat(1) to report on contention and hold events for lockmgr locks. Document the new probes in dtrace_lockstat.4, and deduplicate some of the existing probe descriptions. Reviewed by: mjg MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D21355 Notes: svn path=/head/; revision=351361
* lockstat: track lockstat just like sdt probesMateusz Guzik2018-04-241-1/+1
| | | | | | | In particular flip the frequently tested var to bool. Notes: svn path=/head/; revision=332900
* sys/kern: adoption of SPDX licensing ID tags.Pedro F. Giffuni2017-11-271-0/+2
| | | | | | | | | | | | | | | Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Notes: svn path=/head/; revision=326271
* Sprinkle __read_frequently on few obvious places.Mateusz Guzik2017-09-061-1/+1
| | | | | | | | Note that some of annotated variables should probably change their types to something smaller, preferably bit-sized. Notes: svn path=/head/; revision=323236
* mtx: microoptimize lockstat handling in __mtx_lock_sleepMateusz Guzik2017-02-171-1/+1
| | | | | | | This saves a function call and multiple branches after the lock is acquired. Notes: svn path=/head/; revision=313875
* Sprinkle __read_mostly on backoff and lock profiling code.Mateusz Guzik2017-01-271-1/+2
| | | | | | | MFC after: 1 month Notes: svn path=/head/; revision=312890
* Consistently use a reader/writer flag for lockstat probes in rwlock(9) andMark Johnston2015-07-191-4/+4
| | | | | | | | sx(9), rather than using the probe function name to determine whether a given lock is a read lock or a write lock. Update lockstat(1) accordingly. Notes: svn path=/head/; revision=285704
* Implement the lockstat provider using SDT(9) instead of the custom providerMark Johnston2015-07-191-20/+33
| | | | | | | | | | | in lockstat.ko. This means that lockstat probes now have typed arguments and will utilize SDT probe hot-patching support when it arrives. Reviewed by: gnn Differential Revision: https://reviews.freebsd.org/D2993 Notes: svn path=/head/; revision=285703
* Pass the lock object to lockstat_nsecs() and return immediately ifMark Johnston2015-07-181-2/+5
| | | | | | | | | | | | LO_NOPROFILE is set. Some timecounter handlers acquire a spin mutex, and we don't want to recurse if lockstat probes are enabled. PR: 201642 Reviewed by: avg MFC after: 3 days Notes: svn path=/head/; revision=285664
* Modify lockstat_nsecs() to just return unless lockstat probes are actuallyMark Johnston2015-07-181-1/+4
| | | | | | | | | | | | | | | enabled. The cost of a timecounter read can be quite significant, and the problem became more apparent after r284297, since that change resulted in a call to lockstat_nsecs() for each acquisition of an rwlock read lock. PR: 201642 Reviewed by: avg Tested by: Jason Unovitch MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D3073 Notes: svn path=/head/; revision=285663
* - For kernel compiled only with KDTRACE_HOOKS and not any lock debuggingAttilio Rao2013-11-251-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | option, unbreak the lock tracing release semantic by embedding calls to LOCKSTAT_PROFILE_RELEASE_LOCK() direclty in the inlined version of the releasing functions for mutex, rwlock and sxlock. Failing to do so skips the lockstat_probe_func invokation for unlocking. - As part of the LOCKSTAT support is inlined in mutex operation, for kernel compiled without lock debugging options, potentially every consumer must be compiled including opt_kdtrace.h. Fix this by moving KDTRACE_HOOKS into opt_global.h and remove the dependency by opt_kdtrace.h for all files, as now only KDTRACE_FRAMES is linked there and it is only used as a compile-time stub [0]. [0] immediately shows some new bug as DTRACE-derived support for debug in sfxge is broken and it was never really tested. As it was not including correctly opt_kdtrace.h before it was never enabled so it was kept broken for a while. Fix this by using a protection stub, leaving sfxge driver authors the responsibility for fixing it appropriately [1]. Sponsored by: EMC / Isilon storage division Discussed with: rstone [0] Reported by: rstone [1] Discussed with: philip Notes: svn path=/head/; revision=258541
* Add the OpenSolaris dtrace lockstat provider. The lockstat providerStacey Son2009-05-261-0/+64
adds probes for mutexes, reader/writer and shared/exclusive locks to gather contention statistics and other locking information for dtrace scripts, the lockstat(1M) command and other potential consumers. Reviewed by: attilio jhb jb Approved by: gnn (mentor) Notes: svn path=/head/; revision=192853
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