linux-kernel - Re: [SUGGESTION]: drop virtual merge accounting in I/O requests

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Message-Id: <20080713.174855.234796356.davem@davemloft.net>
Date:	Sun, 13 Jul 2008 17:48:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mpatocka@...hat.com
Cc:	andi@...stfloor.org, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, jens.axboe@...cle.com
Subject: Re: [SUGGESTION]: drop virtual merge accounting in I/O requests

From: Mikulas Patocka <mpatocka@...hat.com>
Date: Sun, 13 Jul 2008 19:53:01 -0400 (EDT)

> There is no need to turn BIO merge off --- the problem is caused by 
> accounting of BIO merging in block layer, not by BIO merging itself.
> 
> Just do #define BIO_VMERGE_BOUNDARY 0, and that disables the accounting, 
> but leaves merging as it is.

For the thousanth time, the BIO_VMERGE_BOUNDARY code is useful
and worked perfectly fine before segment boundary handling was
added to the block layer.

It's a regression, and as such should be fixed or the guilty
code reverted.

Since when do we say "sorry that got broken, turn it off, thanks"
?
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