linux-kernel - Re: [PATCH] Introduce a method to catch mmap_region (was: Recent kernel "mount" slow)

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Message-ID: <CA+55aFw+9FRKZRe4-eSE3m9rGNfiUMM4-QETHizwYCRso_=bsg@mail.gmail.com>
Date:	Wed, 28 Nov 2012 12:32:41 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Lai Jiangshan <laijs@...fujitsu.com>, Jan Kara <jack@...e.cz>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] Introduce a method to catch mmap_region (was: Recent
 kernel "mount" slow)

On Wed, Nov 28, 2012 at 12:13 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> I dunno. Maybe there is some fundamental reason why the above is
> broken, but it seems to be a much simpler approach. Sure, you need to
> guarantee that the people who get the write-lock cannot possibly cause
> IO while holding it, but since the only reason to get the write lock
> would be to change the block size, that should be pretty simple, no?

Here is a *COMPLETELY* untested patch. Caveat emptor. It will probably
do unspeakable things to your family and pets.

                              Linus

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