From: erik quanstrom <quanstro@quanstro.net>
To: 9fans@9fans.net
Subject: Re: [9fans] kenfs question?
Date: Sat, 6 Feb 2010 11:16:56 -0500 [thread overview]
Message-ID: <8958c1578747eede379d83afdf918114@ladd.quanstro.net> (raw)
In-Reply-To: <20100206161207.GA31545@centaur.acm.jhu.edu>
> ilock() (pc/lock.c) calls splhi() and then calls lock(). If that lock were contended,
> how would the system not stop? And on a UP system, if you're inside an splhi() block,
> why would you need to take an uncontended lock?
good question. on a up system, splhi() is sufficient. on a mp
system, the losing process will spin until the winning process
is finished.
ken fs does need to return to its mp roots.
- erik
next prev parent reply other threads:[~2010-02-06 16:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-06 16:12 Venkatesh Srinivas
2010-02-06 16:16 ` erik quanstrom [this message]
2010-02-11 13:31 ` Venkatesh Srinivas
2010-02-11 14:55 ` erik quanstrom
2010-02-07 0:12 ` Russ Cox
2010-02-07 3:02 ` Venkatesh Srinivas
2010-02-07 4:44 ` erik quanstrom
2010-02-07 10:42 ` Charles Forsyth
2010-02-07 12:19 ` Venkatesh Srinivas
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