linux-kernel - Re: [patch] remove redundant iov segment check

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Message-Id: <20061204113609.753069b9.akpm@osdl.org>
Date:	Mon, 4 Dec 2006 11:36:09 -0800
From:	Andrew Morton <akpm@...l.org>
To:	"Chen, Kenneth W" <kenneth.w.chen@...el.com>
Cc:	"'Zach Brown'" <zach.brown@...cle.com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [patch] remove redundant iov segment check

On Mon, 4 Dec 2006 08:26:36 -0800
"Chen, Kenneth W" <kenneth.w.chen@...el.com> wrote:

> So it's not possible to call down to generic_file_aio_read/write with invalid
> iov segment.  Patch proposed to delete these redundant code.

erp, please don't touch that code.

The writev deadlock fixes which went into 2.6.17 trashed writev()
performance and Nick and I are slowly trying to get it back, while fixing
the has-been-there-forever pagefault-in-write() deadlock.

This is all proving very hard to do, and we don't need sweeping code
cleanups happening under our feet ;)

I'll bring those patches back in next -mm, but not very confidently.
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