linux-kernel - Re: POHMELFS high performance network filesystem. Transactions, failover, performance.

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Message-Id: <20080513233341.47edea7f.akpm@linux-foundation.org>
Date:	Tue, 13 May 2008 23:33:41 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: POHMELFS high performance network filesystem. Transactions,
 failover, performance.

On Tue, 13 May 2008 21:45:24 +0400 Evgeniy Polyakov <johnpol@....mipt.ru> wrote:

> I'm please to announce POHMEL high performance network filesystem.

If any thread takes more than one kmap() at a time, it is deadlockable.
Because there is a finite pool of kmaps.  Everyone can end up holding
one or more kmaps, then waiting for someone else to release one.

Duplicating page_waitqueue() is bad.  Exporting it is probably bad too.
Better would be to help us work out why the core kernel infrastructure is
unsuitable, then make it suitable.
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