Re: [PATCH] vmalloc: introduce vmap_pfn for persistent memory

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Subject: Re: [PATCH] vmalloc: introduce vmap_pfn for persistent memory
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 8 Nov 2017 09:47:47 -0800
Cc: linux-nvdimm@xxxxxxxxxxxx, Dan Williams <dan.j.williams@xxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, dm-devel@xxxxxxxxxx, Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>, Laura Abbott <labbott@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
In-reply-to: <alpine.LRH.2.02.1711081236570.1168@file01.intranet.prod.int.rdu2.redhat.com>
References: <alpine.LRH.2.02.1711071645240.1339@file01.intranet.prod.int.rdu2.redhat.com> <20171108095909.GA7390@infradead.org> <alpine.LRH.2.02.1711080725490.12294@file01.intranet.prod.int.rdu2.redhat.com> <20171108150447.GA10374@infradead.org> <alpine.LRH.2.02.1711081007570.8618@file01.intranet.prod.int.rdu2.redhat.com> <20171108153522.GB24548@infradead.org> <alpine.LRH.2.02.1711081236570.1168@file01.intranet.prod.int.rdu2.redhat.com>
User-agent: Mutt/1.8.3 (2017-05-23)

Can you start by explaining what you actually need the vmap for?

Going through a vmap for every I/O is certainly not going to be nice
on NVDIMM-N or similar modules :)

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