From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Dave Liu <r63238@freescale.com>
Cc: ppc-dev <linuxppc-dev@ozlabs.org>,
Paul Mackerras <paulus@samba.org>,
Kumar Gala <galak@gate.crashing.org>
Subject: Re: fsl booke MM vs. SMP questions
Date: Wed, 23 May 2007 08:42:22 +1000 [thread overview]
Message-ID: <1179873742.32247.864.camel@localhost.localdomain> (raw)
In-Reply-To: <1179831375.3827.4.camel@localhost.localdomain>
On Tue, 2007-05-22 at 18:56 +0800, Dave Liu wrote:
> On Tue, 2007-05-22 at 13:09 +1000, Benjamin Herrenschmidt wrote:
> > In the end, the best solution might still be to simply not do any of
> > this and instead send an IPI on invalidations. That's the method used by
> > most architectures in linux (if not all) that do software TLB load on
> > SMP. Basically, the invalidate code path then does:
> >
> > - Update the linux PTE
> > - write barrier
> > - send IPI interrupt to all CPUs in mm->cpu_vm_mask
> > - local TLB flush
> >
> > And the IPI does a local TLB flush on all affected CPUs.
>
> How to avoid IPI interrupt missing if the IPI interrupt is edge-
> triggered?
>
> or How to make sure TLB flushed on the else all affected CPUs?
The IPIs should be buffered by the PIC ... delivered only once but
still. Also, IPI handling in linux is synchronous, there is an ack to
wait for the remote function to complete.
Ben.
next prev parent reply other threads:[~2007-05-22 22:42 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-21 7:06 fsl booke MM vs. SMP questions Benjamin Herrenschmidt
[not found] ` <1179741447.3660.7.camel@localhost.localdomain>
[not found] ` <1179742083.32247.689.camel@localhost.localdomain>
2007-05-21 11:37 ` Dave Liu
2007-05-21 22:07 ` Benjamin Herrenschmidt
2007-05-22 3:09 ` Benjamin Herrenschmidt
2007-05-22 10:56 ` Dave Liu
2007-05-22 22:42 ` Benjamin Herrenschmidt [this message]
2007-05-23 2:38 ` Dave Liu
2007-05-23 3:08 ` Benjamin Herrenschmidt
2007-05-28 9:05 ` Liu Dave-r63238
2007-05-28 9:24 ` Benjamin Herrenschmidt
2007-05-28 9:37 ` Liu Dave-r63238
2007-05-28 10:00 ` Benjamin Herrenschmidt
2007-05-28 10:23 ` Gabriel Paubert
2007-05-28 10:28 ` Benjamin Herrenschmidt
2007-05-22 8:46 ` Gabriel Paubert
2007-05-22 9:14 ` Benjamin Herrenschmidt
2007-05-22 10:02 ` Gabriel Paubert
2007-05-22 10:05 ` Benjamin Herrenschmidt
2007-05-23 9:12 ` Gabriel Paubert
2007-05-22 3:03 ` Kumar Gala
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