From: Ingo Molnar <mingo@elte.hu>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: emin ak <eminak71@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.16-rt10 crash on ppc
Date: Thu, 30 Mar 2006 09:13:22 +0200 [thread overview]
Message-ID: <20060330071322.GA3137@elte.hu> (raw)
In-Reply-To: <442B4890.6000905@yahoo.com.au>
* Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> Yes, that patch is basically what I had in mind.
>
> Is -rt ever allocating memory from really-hard-don't-preempt-me
> context? I guess not, unless the zone->lock is one of those locks too,
> right?
no. zone->lock (and all the slab locks, and all the other MM locks) are
fully preemptible too.
> Should you add a
>
> #else
> BUG_ON(_really_dont_preempt_me());
> #endif
>
> just for safety, or will such misusage get caught elsewhere (eg. when
> attempting to take zone->lock).
it should be caught immediately, by the cond_resched().
Ingo
next prev parent reply other threads:[~2006-03-30 7:15 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-27 14:56 2.6.16-rt10 crash on ppc emin ak
2006-03-27 17:11 ` emin ak
2006-03-27 20:31 ` emin ak
2006-03-28 1:21 ` Nick Piggin
2006-03-29 15:08 ` Ingo Molnar
2006-03-30 2:55 ` Nick Piggin
2006-03-30 7:13 ` Ingo Molnar [this message]
2006-03-30 7:18 ` Kumar Gala
2006-03-30 7:23 ` Ingo Molnar
2006-03-30 10:25 ` emin ak
2006-03-30 11:34 ` Ingo Molnar
2006-03-30 14:55 ` emin ak
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