From: Junio C Hamano <junkio@cox.net>
Date: Fri, 05 Jan 2007 23:58:31 GMT
Subject: Re: git-svnimport failed and now git-repack hates me
Message-ID: <7vac0xc9g8.fsf@assigned-by-dhcp.cox.net>
In-Reply-To: <Pine.LNX.4.64.0701051515000.3661@woody.osdl.org>

Linus Torvalds <torvalds@osdl.org> writes:

> It does actually end up forcing the kernel to do more work (it's harder to 
> re-use a mapped page than it is to reuse one that isn't), and in that 
> sense, if you have less than <n> GB of RAM and can't just keep it all in 
> memory at the same time, doing one large mmap is possibly more expensive 
> than chunking things up.

Even if it is a read-only private mapping?  Would MAP_SHARED
help?