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fc45975ec8
The Blocking Queue (bqueue) code is used by zfs send/receive to send messages between the various threads. It uses a shared linked list, which is locked whenever we enqueue or dequeue. For workloads which process many blocks per second, the locking on the shared list can be quite expensive. This commit changes the bqueue logic to have 3 linked lists: 1. An enquing list, which is used only by the (single) enquing thread, and thus needs no locks. 2. A shared list, with an associated lock. 3. A dequing list, which is used only by the (single) dequing thread, and thus needs no locks. The entire enquing list can be moved to the shared list in constant time, and the entire shared list can be moved to the dequing list in constant time. These operations only happen when the `fill_fraction` is reached, or on an explicit flush request. Therefore, the lock only needs to be acquired infrequently. The API already allows for dequing to block until an explicit flush, so callers don't need to be changed. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Wilson <george.wilson@delphix.com> Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #14121 |
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