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Re: kern/39206: ffs um_lock handling isn't great
The following reply was made to PR kern/39206; it has been noted by GNATS.
From: Antti Kantee <pooka%cs.hut.fi@localhost>
Subject: Re: kern/39206: ffs um_lock handling isn't great
Date: Sun, 27 Jul 2008 18:43:41 +0300
On Fri Jul 25 2008 at 14:15:00 +0000, Simon Burge wrote:
> Code inspection. Pooka suggested introducing a sleep after
> um_lock is dropped at the top of ffs_alloccg() and have more
> than one thread trying to allocate blocks in the filesystem.
Just wanted to state the obvious in case someone wants to try to prove
this is a problem: the threads need to want to allocate a block from the
same cylinder group, which must have room to satisfy only one allocation.
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