linux-kernel - Re: [PATCH 1/4] mm: infrastructure for page fault page caching

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Message-Id: <20181204144942.63c98a3147071f054d77427d@linux-foundation.org>
Date:   Tue, 4 Dec 2018 14:49:42 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Josef Bacik <josef@...icpanda.com>
Cc:     kernel-team@...com, hannes@...xchg.org,
        linux-kernel@...r.kernel.org, tj@...nel.org, david@...morbit.com,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, riel@...hat.com,
        jack@...e.cz
Subject: Re: [PATCH 1/4] mm: infrastructure for page fault page caching

On Fri, 30 Nov 2018 14:58:09 -0500 Josef Bacik <josef@...icpanda.com> wrote:

> We want to be able to cache the result of a previous loop of a page
> fault in the case that we use VM_FAULT_RETRY,

Please explain here why we want to do that.

> so introduce
> handle_mm_fault_cacheable that will take a struct vm_fault directly, add
> a ->cached_page field to vm_fault, and add helpers to init/cleanup the
> struct vm_fault.
> 
> I've converted x86, other arch's can follow suit if they so wish, it's
> relatively straightforward.
>