[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] gntdev: switch back to rwlocks
>>> On 09.07.10 at 16:32, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> >>> wrote: > Hi Jeremy, > this patch switches back from spinlocks to rwlocks in gntdev, solving > the locking issue that was preventing stubdoms from working. > In particular the problem is that gntdev_mmap calls apply_to_page_range > after acquiring the spinlock. apply_to_page_range causes the mmu > notifiers to be called, so mn_invl_range_start will be called that will > try to acquire again the same spinlock. Shouldn't this be solved in a way not depending on an implementation detail (rw-locks being unfair in that readers can lock out writers indefinitely)? Is it even certain that all arch-es implement rw-locks in a manner compatible with this? Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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