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Testing has shown that tq->tq_lock can be highly contended when a large number of small work items are dispatched. The lock hold time is reduced by the following changes: 1) Use exclusive threads in the work_waitq When a single work item is dispatched we only need to wake a single thread to service it. The current implementation uses non-exclusive threads so all threads are woken when the dispatcher calls wake_up(). If a large number of threads are in the queue this overhead can become non-negligible. 2) Conditionally add/remove threads from work waitq Taskq threads need only add themselves to the work wait queue if there are no pending work items. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #32 |
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| .. | ||
| .gitignore | ||
| Makefile.in | ||
| spl-atomic.c | ||
| spl-condvar.c | ||
| spl-cred.c | ||
| spl-debug.c | ||
| spl-err.c | ||
| spl-generic.c | ||
| spl-kmem.c | ||
| spl-kobj.c | ||
| spl-kstat.c | ||
| spl-module.c | ||
| spl-mutex.c | ||
| spl-proc.c | ||
| spl-rwlock.c | ||
| spl-taskq.c | ||
| spl-thread.c | ||
| spl-time.c | ||
| spl-tsd.c | ||
| spl-vnode.c | ||
| spl-xdr.c | ||
| spl-zlib.c | ||