From owner-freebsd-current Sun May 5 23:52:21 2002
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Mon, 06 May 2002 00:52:08 -0600
Date: Mon, 6 May 2002 15:53:27 +0900
From: qhwt@myrealbox.com
To: Jeff Roberson <jroberson@chesapeake.net>
Cc: current@freebsd.org
Subject: Re: LOOKUP_SHARED is default now
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Hi.
On Tue, Apr 09, 2002 at 01:08:04AM -0400, Jeff Roberson wrote:
> This patch has seriously reduced file system deadlocks for several people.
> It also makes concurrent file system access much faster in certain cases.
> Since I have only heard good reports and no bad reports I'm going to
> enable it by default. If you do experience some file system deadlocks
> please let me know. You may revert to the previous behavior with 'options
> LOOKUP_EXCLUSIVE'. I will take this away after a month or so if there are
> no problems.
I've been struggling upgrading kernel since beginning of April, and finally
found I have to add "options LOOKUP_EXCLUSIVE" to my kernel config file.
Without LOOKUP_EXCLUSIVE,
- some of the processes stall in "inode" state, and can't be killed
by any signals
- shutting down(and maybe unmounting) the system results in the panic:
lockmgr: upgrade exclusive lock
The stalling processes are all touching files under nullfs-mounted
directories, so I think nullfs code is not yet LOOKUP_SHARED-safe.
If anyone is interested, I can post the backtrace and my kernel config
(after upgrading the world and rebuilding the panicking kernel).
Regards.
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