From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Wed, 27 Apr 2016 12:56:27 GMT
Subject: Re: What's cooking in git.git (Apr 2016, #07; Mon, 25)
Message-ID: <alpine.DEB.2.20.1604271454250.2896@virtualbox>
In-Reply-To: <xmqqoa8xia1j.fsf@gitster.mtv.corp.google.com>

Hi Junio,

On Mon, 25 Apr 2016, Junio C Hamano wrote:

> * js/win32-mmap (2016-04-22) 3 commits
>   (merged to 'next' on 2016-04-22 at cd39c60)
>  + mmap(win32): avoid expensive fstat() call
>  + mmap(win32): avoid copy-on-write when it is unnecessary
>  + win32mmap: set errno appropriately
> 
>  mmap emulation on Windows has been optimized.

Please note that it is not purely an optimization. It is also a bug fix in
case of a pretty full disk: on Windows, mmap() is backed by the page file
if it is in copy-on-write mode, and that can fail when the free space on
the drive that has the page file drops below a certain threshold.

Thanks,
Dscho