2c02b71b14
To lay the ground work for introducing the taskq_dispatch_prealloc() interface, the tq_work_list and tq_threads fields had to be replaced with new alternatives in the taskq_t structure. The tq_threads field was replaced with tq_thread_list. Rather than storing the pointers to the taskq's kernel threads in an array, they are now stored as a list. In addition to laying the ground work for the taskq_dispatch_prealloc() interface, this change could also enable taskq threads to be dynamically created and destroyed as threads can now be added and removed to this list relatively easily. The tq_work_list field was replaced with tq_active_list. Instead of keeping a list of taskq_ent_t's which are currently being serviced, a list of taskq_threads currently servicing a taskq_ent_t is kept. This frees up the taskq_ent_t's tqent_list field when it is being serviced (i.e. now when a taskq_ent_t is being serviced, it's tqent_list field will be empty). Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #65 |
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