Re: [Qemu-devel] [QEMU-devel][PATCH v4 0/2] Fix concurrent aio_poll/set_fd_handler.

[Remy NOEL]

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 
finding you).

Thanks for the RCU hints, i though the performance hit was due to the 
RCU being global to qemu.


Remy