Re: [PATCH] don't use mmap() to hash files

From: Dmitry Potapov <dpotapov@gmail.com>
Date: Feb 15, 2010, 12:25 UTC
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:

Show 6 quoted lines

> 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

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