From: erik quanstrom <quanstro@quanstro.net>
To: 9fans@9fans.net
Subject: Re: [9fans] why not halt in x86 multicore
Date: Fri, 1 Jul 2011 14:01:28 -0400 [thread overview]
Message-ID: <bb78dd1fd32a508d375ac34343222402@ladd.quanstro.net> (raw)
In-Reply-To: <BANLkTimi9--KwDHY7u0KCpZO_6B5n6bEwg@mail.gmail.com>
>
> interprocessor interrupts are the obvious solution
> but no one has bothered to implement them.
>
i almost mentioned this, and it's on my list. i just haven't
had the time. it turns out that a naive implementation of
ipi'ing 1 proc per wakeup will have to watch out for the
same races that bedeviled multiprocessor sleep/wakeup.
the really naive solution of waking 'em all up is a very
bad idea because you'll have n-1 procs duking it out
over the run queue.
perhaps i just ignorant of the standard solution.
or perhaps the sleep/wakeup model isn't the right one
for the situation.
- erik
next prev parent reply other threads:[~2011-07-01 18:01 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-01 14:00 Henning Schild
2011-07-01 17:23 ` erik quanstrom
2011-07-01 17:47 ` Ali Mashtizadeh
2011-07-01 17:51 ` Russ Cox
2011-07-01 18:01 ` erik quanstrom [this message]
2011-07-01 18:35 ` Bakul Shah
2011-07-02 5:06 ` Venkatesh Srinivas
2011-07-04 9:24 ` Henning Schild
2011-07-04 9:54 ` Sape Mullender
2011-07-04 13:02 ` erik quanstrom
2011-07-04 13:13 ` Steve Simon
2011-07-04 13:43 ` erik quanstrom
2011-07-04 13:47 ` Steve Simon
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