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Date: Wed, 23 Dec 2020 14:32:07 +0800 From: Yongji Xie <xieyongji@...edance.com> To: Christoph Hellwig <hch@...radead.org> Cc: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, Stefan Hajnoczi <stefanha@...hat.com>, sgarzare@...hat.com, Parav Pandit <parav@...dia.com>, akpm@...ux-foundation.org, Randy Dunlap <rdunlap@...radead.org>, Matthew Wilcox <willy@...radead.org>, viro@...iv.linux.org.uk, axboe@...nel.dk, bcrl@...ck.org, corbet@....net, virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, kvm@...r.kernel.org, linux-aio@...ck.org, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [RFC v2 01/13] mm: export zap_page_range() for driver use On Tue, Dec 22, 2020 at 11:44 PM Christoph Hellwig <hch@...radead.org> wrote: > > On Tue, Dec 22, 2020 at 10:52:09PM +0800, Xie Yongji wrote: > > Export zap_page_range() for use in VDUSE. > > Err, no. This has absolutely no business being used by drivers. Now I want to map/unmap some pages in an userland vma dynamically. The vm_insert_page() is being used for mapping. In the unmapping case, it looks like the zap_page_range() does what I want. So I export it. Otherwise, we need some ways to notify userspace to trigger it with madvise(MADV_DONTNEED), which might not be able to meet all our needs. For example, unmapping some pages in a memory shrinker function. So I'd like to know what's the limitation to use zap_page_range() in a module. And if we can't use it in a module, is there any acceptable way to achieve that? Thanks. Yongji
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