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Date: Fri, 17 May 2013 17:02:40 +0200
From: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20130517150240.GB2725@dhcp-200-207.str.redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 0/2] coroutine: dataplane support
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To: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, "Shergill,
	Gurinder" <gurinder.shergill@hp.com>, "Vinod,
	Chegu" <chegu_vinod@hp.com>, qemu-devel@nongnu.org

Am 17.05.2013 um 15:51 hat Stefan Hajnoczi geschrieben:
> There is ongoing work to enable multiple event loop threads.  This will allow
> QEMU itself to take advantage of SMP and reduce Big QEMU Lock (BQL) contention.
> This series is one step in that effort.
> 
> These patches make coroutines safe in a multi-event loop/multi-threaded world.
> I have successfully tested them running qcow2 in a dataplane thread (further
> patches are required which I'll be sending soon).
> 
> Patch 1 protects the global coroutine freelist with a lock :).
> 
> Patch 2 drops the CoQueue dependency on AioContext.  This allows CoMutex and
> CoRwlock to operate in a dataplane thread whereas previously we always
> scheduled coroutines in the QEMU iothread.
> 
> Stefan Hajnoczi (2):
>   coroutine: protect global pool with a mutex
>   coroutine: stop using AioContext in CoQueue
> 
>  include/block/coroutine_int.h |  4 ++++
>  qemu-coroutine-lock.c         | 56 ++++++++++++++++---------------------------
>  qemu-coroutine.c              | 23 ++++++++++++++++--
>  trace-events                  |  2 +-
>  4 files changed, 47 insertions(+), 38 deletions(-)

Reviewed-by: Kevin Wolf <kwolf@redhat.com>