Re: [PATCH RFC 0/3] MAP_POPULATE for device memory

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To: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: Re: [PATCH RFC 0/3] MAP_POPULATE for device memory
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Sun, 6 Mar 2022 23:48:26 -0800
Cc: Jarkko Sakkinen <jarkko@xxxxxxxxxx>, linux-mm@xxxxxxxxx, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Nathaniel McCallum <nathaniel@xxxxxxxxxxx>, Reinette Chatre <reinette.chatre@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linux-sgx@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Florian Fainelli <f.fainelli@xxxxxxxxx>, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, Matthew Auld <matthew.auld@xxxxxxxxx>, Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>, Daniel Vetter <daniel.vetter@xxxxxxxx>, Jason Ekstrand <jason@xxxxxxxxxxxxxx>, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>, Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>, Vasily Averin <vvs@xxxxxxxxxxxxx>, Shakeel Butt <shakeelb@xxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, zhangyiru <zhangyiru3@xxxxxxxxxx>, Alexey Gladkov <legion@xxxxxxxxxx>, Alexander Mikhalitsyn <alexander.mikhalitsyn@xxxxxxxxxxxxx>, linux-mips@xxxxxxxxxxxxxxx, intel-gfx@xxxxxxxxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, codalist@xxxxxxxxxxxxxxxxxxxxxxxx, linux-unionfs@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx
In-reply-to: <YiSb7tsUEBRGS+HA@casper.infradead.org>
References: <20220306053211.135762-1-jarkko@kernel.org> <YiSb7tsUEBRGS+HA@casper.infradead.org>

On Sun, Mar 06, 2022 at 11:33:02AM +0000, Matthew Wilcox wrote:
> On Sun, Mar 06, 2022 at 07:32:04AM +0200, Jarkko Sakkinen wrote:
> > For device memory (aka VM_IO | VM_PFNMAP) MAP_POPULATE does nothing. Allow
> > to use that for initializing the device memory by providing a new callback
> > f_ops->populate() for the purpose.
> 
> As I said, NAK.

Agreed.  This is an amazingly bad interface.

Follow-Ups:
- Re: [PATCH RFC 0/3] MAP_POPULATE for device memory
  - From: Jarkko Sakkinen

References:
- [PATCH RFC 0/3] MAP_POPULATE for device memory
  - From: Jarkko Sakkinen
- Re: [PATCH RFC 0/3] MAP_POPULATE for device memory
  - From: Matthew Wilcox

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