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Re: [Qemu-devel] [QEMU-devel][PATCH v4 0/2] Fix concurrent aio_poll/set_
Re: [Qemu-devel] [QEMU-devel][PATCH v4 0/2] Fix concurrent aio_poll/set_fd_handler.
Mon, 24 Dec 2018 13:38:47 +0100
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.2
On 12/21/18 12:34 PM, Paolo Bonzini wrote:
FWIW, I had missed the early version that used RCU, but lockcnt is
already very RCU-like, so not using RCU is the right thing to do. The
difference between lockcnt and RCU is that cleanup is done by the reader
instead of a separate thread. Because we know that reader/writer
concurrency is very rare for AioContext handlers, the tradeoffs favor
lockcnt over RCU.
Indeed, i forgot to CC you in the first batch (get_maintainer.pl was not
Thanks for the RCU hints, i though the performance hit was due to the
RCU being global to qemu.