From: Venkatesh Srinivas <me@acm.jhu.edu>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] kenfs question?
Date: Thu, 11 Feb 2010 08:31:14 -0500 [thread overview]
Message-ID: <f75780241002110531l34204808icbabc8430737bcfd@mail.gmail.com> (raw)
In-Reply-To: <8958c1578747eede379d83afdf918114@ladd.quanstro.net>
On Sat, Feb 6, 2010 at 11:16 AM, erik quanstrom <quanstro@quanstro.net> wrote:
>> 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.
>
Did kenfs ever run on MP systems and use >1 CPU?
-- vs
next prev parent reply other threads:[~2010-02-11 13:31 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
2010-02-11 13:31 ` Venkatesh Srinivas [this message]
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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