From: Alex Riesen <raa.lkml@gmail.com>
Date: Tue, 18 Jul 2006 18:49:48 GMT
Subject: Re: comparing file contents in is_exact_match?
Message-ID: <81b0412b0607181149k74165724pa0a513d14704ce73@mail.gmail.com>
In-Reply-To: <Pine.LNX.4.64.0607180837260.3386@evo.osdl.org>

On 7/18/06, Linus Torvalds <torvalds@osdl.org> wrote:
> So I really think we should just basically always mmap the pack-files (it
> should work everywhere), and make NO_MMAP just trigger on the other cases.

And while we are at it make a mental note about avoiding platforms with
broken mmap. For instance, QNX6 mmap with MAP_PRIVATE _always_
makes a copy of the whole! file, the stupid thing (they even documented it so!).
The alternative flag, MAP_SHARED, does not work on some filesystems at all.