Messages in this thread | | | Subject | Re: [RFC PATCH v3 4/8] vfio/type1: Pre-map more pages than requested in the IOPF handling | From | Shenming Lu <> | Date | Fri, 21 May 2021 14:37:55 +0800 |
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On 2021/5/19 2:58, Alex Williamson wrote: > On Fri, 9 Apr 2021 11:44:16 +0800 > Shenming Lu <lushenming@huawei.com> wrote: > >> To optimize for fewer page fault handlings, we can pre-map more pages >> than requested at once. >> >> Note that IOPF_PREMAP_LEN is just an arbitrary value for now, which we >> could try further tuning. > > I'd prefer that the series introduced full end-to-end functionality > before trying to improve performance. The pre-map value seems > arbitrary here and as noted in the previous patch, the IOMMU API does > not guarantee unmaps of ranges smaller than the original mapping. This > would need to map with single page granularity in order to guarantee > page granularity at the mmu notifier when the IOMMU supports > superpages. Thanks,
Yeah, I will drop this patch in the current stage.
Thanks, Shenming
> > Alex > > . >
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