From: Dmitry Potapov <dpotapov@gmail.com>
Date: Mon, 15 Feb 2010 12:25:27 GMT
Subject: Re: [PATCH] don't use mmap() to hash files
Message-ID: <37fcd2781002150425od069e75ueaff424e2357d78b@mail.gmail.com>
In-Reply-To: <4B78FC36.1090108@gnu.org>

On Mon, Feb 15, 2010 at 10:48 AM, Paolo Bonzini <bonzini@gnu.org> wrote:
> On 02/14/2010 08:56 PM, Dmitry Potapov wrote:
>>
>> It may not work without enough swap space
>
> No, the kernel will use the file itself as "swap" if it has to page out the
> memory (since the mmap is PROT_READ).

I was speaking about read(), when the whole file is read  in memory. In
this case, you are going to use a lot of "swap" and it is not pretty...
That's why I said maybe we should have an option here...


Dmitry