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aio-posix: avoid reacquiring rcu_read_lock() when polling
authorStefan Hajnoczi <[email protected]>
Tue, 18 Feb 2020 18:27:08 +0000 (18:27 +0000)
committerStefan Hajnoczi <[email protected]>
Sat, 22 Feb 2020 08:26:47 +0000 (08:26 +0000)
commitf25c0b547916962d0b1be260b5b643287bea0851
tree15de99bb92f45f7ffd006085ccb8f5e6fcd40427tree | snapshot
parentc9b7d9ec21dfca716f0bb3b68dee75660d86629ccommit | diff
aio-posix: avoid reacquiring rcu_read_lock() when polling

The first rcu_read_lock/unlock() is expensive.  Nested calls are cheap.

This optimization increases IOPS from 73k to 162k with a Linux guest
that has 2 virtio-blk,num-queues=1 and 99 virtio-blk,num-queues=32
devices.

Signed-off-by: Stefan Hajnoczi <[email protected]>
Reviewed-by: Paolo Bonzini <[email protected]>
Message-id: 20200218182708[email protected]
Signed-off-by: Stefan Hajnoczi <[email protected]>
util/aio-posix.c diff | blob | blame | history
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