linux-kernel - Re: [RFC PATCH 0/3] vfio/type1: Reduce vfio

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Message-ID: <20200117011050.GC1759@joy-OptiPlex-7040>
Date:   Thu, 16 Jan 2020 20:10:51 -0500
From:   Yan Zhao <yan.y.zhao@...el.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/3] vfio/type1: Reduce vfio_iommu.lock contention

Thank you, Alex!
I'll try it and let you know the result soon. :)

On Fri, Jan 17, 2020 at 02:17:49AM +0800, Alex Williamson wrote:
> Hi Yan,
> 
> I wonder if this might reduce the lock contention you're seeing in the
> vfio_dma_rw series.  These are only compile tested on my end, so I hope
> they're not too broken to test.  Thanks,
> 
> Alex
> 
> ---
> 
> Alex Williamson (3):
>       vfio/type1: Convert vfio_iommu.lock from mutex to rwsem
>       vfio/type1: Replace obvious read lock instances
>       vfio/type1: Introduce pfn_list mutex
> 
> 
>  drivers/vfio/vfio_iommu_type1.c |   67 ++++++++++++++++++++++++---------------
>  1 file changed, 41 insertions(+), 26 deletions(-)
>