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* With retirement of cpumask_t and usage of cpuset_t for representing aattilio2011-07-041-3/+3
| | | | | | | | | | | | | | | mask of CPUs, pc_other_cpus and pc_cpumask become highly inefficient. Remove them and replace their usage with custom pc_cpuid magic (as, atm, pc_cpumask can be easilly represented by (1 << pc_cpuid) and pc_other_cpus by (all_cpus & ~(1 << pc_cpuid))). This change is not targeted for MFC because of struct pcpu members removal and dependency by cpumask_t retirement. MD review by: marcel, marius, alc Tested by: pluknet MD testing by: marcel, marius, gonzo, andreast
* Commit the support for removing cpumask_t and replacing it directly withattilio2011-05-051-7/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | cpuset_t objects. That is going to offer the underlying support for a simple bump of MAXCPU and then support for number of cpus > 32 (as it is today). Right now, cpumask_t is an int, 32 bits on all our supported architecture. cpumask_t on the other side is implemented as an array of longs, and easilly extendible by definition. The architectures touched by this commit are the following: - amd64 - i386 - pc98 - arm - ia64 - XEN while the others are still missing. Userland is believed to be fully converted with the changes contained here. Some technical notes: - This commit may be considered an ABI nop for all the architectures different from amd64 and ia64 (and sparc64 in the future) - per-cpu members, which are now converted to cpuset_t, needs to be accessed avoiding migration, because the size of cpuset_t should be considered unknown - size of cpuset_t objects is different from kernel and userland (this is primirally done in order to leave some more space in userland to cope with KBI extensions). If you need to access kernel cpuset_t from the userland please refer to example in this patch on how to do that correctly (kgdb may be a good source, for example). - Support for other architectures is going to be added soon - Only MAXCPU for amd64 is bumped now The patch has been tested by sbruno and Nicholas Esborn on opteron 4 x 12 pack CPUs. More testing on big SMP is expected to came soon. pluknet tested the patch with his 8-ways on both amd64 and i386. Tested by: pluknet, sbruno, gianni, Nicholas Esborn Reviewed by: jeff, jhb, sbruno
* No need to include sys/systm.h twice.cognet2010-11-161-1/+0
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* rmlock(9) two additions and one change/fix:mlaier2010-09-011-37/+90
| | | | | | | | | | | | - add rm_try_rlock(). - add RM_SLEEPABLE to use sx(9) as the back-end lock in order to sleep while holding the write lock. - change rm_noreadtoken to a cpu bitmask to indicate which CPUs need to go through the lock/unlock in order to synchronize. As a side effect, this also avoids IPI to CPUs without any readers during rm_wlock. Discussed with: ups@, rwatson@ on arch@ Sponsored by: Isilon Systems, Inc.
* Remove extra spaces (no functional change).bz2009-12-251-6/+6
| | | | MFC after: 3 days
* Minor comment tweaks in rmlocks.rwatson2009-12-251-5/+5
| | | | MFC after: 3 days
* Minor style tweak.rwatson2009-05-291-1/+2
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* Since sched_pin() and sched_unpin() are already inlined, don't manuallyrwatson2009-05-291-2/+2
| | | | inline in rmlocks.
* Make the rmlock(9) interface a bit more like the rwlock(9) interface:rwatson2009-05-291-6/+26
| | | | | | | | | | | | | | - Add rm_init_flags() and accept extended options only for that variation. - Add a flags space specifically for rm_init_flags(), rather than borrowing the lock_init() flag space. - Define flag RM_RECURSE to use instead of LO_RECURSABLE. - Define flag RM_NOWITNESS to allow an rmlock to be exempt from WITNESS checking; this wasn't possible previously as rm_init() always passed LO_WITNESS when initializing an rmlock's struct lock. - Add RM_SYSINIT_FLAGS(). - Rename embedded mutex in rmlocks to make it more obvious what it is. - Update consumers. - Update man page.
* Add the OpenSolaris dtrace lockstat provider. The lockstat providersson2009-05-261-0/+16
| | | | | | | | | | 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)
* Improve approximation of style(9).rwatson2009-04-261-149/+132
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* Teach WITNESS about the interlocks used with lockmgr. This removes a bunchjhb2008-09-101-2/+2
| | | | | | | | of spurious witness warnings since lockmgr grew witness support. Before this, every time you passed an interlock to a lockmgr lock WITNESS treated it as a LOR. Reviewed by: attilio
* Expand lock class with the "virtual" function lc_assert which will offerattilio2007-11-181-0/+9
| | | | | | | | | an unified way for all the lock primitives to express lock assertions. Currenty, lockmgrs and rmlocks don't have assertions, so just panic in that case. This will be a base for more callout improvements. Ok'ed by: jhb, jeff
* Add rm_wowned(9) function to test whether the current thread owns anrwatson2007-11-101-0/+7
| | | | | | exclusive lock on the passed rmlock. Reviewed by: ups
* Initial checkin for rmlock (read mostly lock) a multi reader single writerups2007-11-081-0/+500
lock optimized for almost exclusive reader access. (see also rmlock.9) TODO: Convert to per cpu variables linkerset as soon as it is available. Optimize UP (single processor) case.
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