From: Paul Mackerras <paulus@samba.org>
To: Val Henson <val@nmt.edu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: smp_send_reschedule vs. smp_migrate_task
Date: Fri, 15 Feb 2002 09:28:56 +1100 (EST) [thread overview]
Message-ID: <15468.14888.334751.716019@argo.ozlabs.ibm.com> (raw)
In-Reply-To: <20020214150331.P30586@boardwalk>
In-Reply-To: <15466.6058.686853.295549@argo.ozlabs.ibm.com> <20020214150331.P30586@boardwalk>
Val Henson writes:
> I had only one IPI for the RPIC (an interrupt controller only used on
> Synergy PPC boards) and I implemented a little message queue to
> simulate all 4 IPI's. The mailbox implementation suggested by James
> Bottomley ended up having race conditions on our board. It's probably
> not the most elegant solution, but it works and required no change to
> the PowerPC SMP code. See my "Make Gemini boot" patch to linuxppc-dev
> and take a look at the files rpic.c and rpic.h.
In that post I was really asking the following questions:
* how often does smp_send_reschedule get called?
* how often does smp_migrate_task get called?
* if smp_send_reschedule and smp_migrate_task were mutually exclusive,
i.e. both used the same spinlock, could that lead to deadlock?
James Bottomley answered the first two for me but not the third.
Paul.
next prev parent reply other threads:[~2002-02-14 22:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-13 7:37 Paul Mackerras
2002-02-14 22:03 ` Val Henson
2002-02-14 22:28 ` Paul Mackerras [this message]
2002-02-15 5:55 ` Val Henson
2002-02-14 23:24 James Bottomley
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