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Date: Tue, 10 Aug 2021 13:55:00 +0100 From: Christoph Hellwig <hch@...radead.org> To: Jason Gunthorpe <jgg@...dia.com> Cc: Christoph Hellwig <hch@...radead.org>, Alex Williamson <alex.williamson@...hat.com>, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, peterx@...hat.com Subject: Re: [PATCH 3/7] vfio/pci: Use vfio_device_unmap_mapping_range() On Tue, Aug 10, 2021 at 08:57:22AM -0300, Jason Gunthorpe wrote: > I'm not sure there is a real performance win to chase here? Doesn't > this only protect mmap against reset? The mmap isn't performance > sensitive, right? > > If this really needs extra optimization adding a rwsem to the devset > and using that across the whole set would surely be sufficient. Every mmio read or write takes memory_lock.
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