From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Tim Chavez <tinytim@us.ibm.com>,
Linux-rt <linux-rt-users@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Jean Pierre Dion <jean-pierre.dion@bull.net>,
linux-ppc <linuxppc-dev@ozlabs.org>,
Sebastien Dugue <sebastien.dugue@bull.net>,
Paul Mackerras <paulus@samba.org>,
Gilles Carry <Gilles.Carry@ext.bull.net>
Subject: Re: [PATCH 2/2][RT] powerpc - Make the irq reverse mapping radix tree lockless
Date: Fri, 25 Jul 2008 15:13:39 +1000 [thread overview]
Message-ID: <1216962819.11188.82.camel@pasglop> (raw)
In-Reply-To: <200807242111.35338.nickpiggin@yahoo.com.au>
> > Concurrency between readers and writers are handled by the intrinsic
> > properties of the concurrent radix tree. Concurrency between the tree
> > initialization which is done asynchronously with readers and writers access
> > is handled via an atomic variable (revmap_trees_allocated) set when the
> > tree has been initialized and checked before any reader or writer access
> > just like we used to check for tree.gfp_mask != 0 before.
>
> Hmm, RCU radix tree is in mainline too for quite a while. I thought
> Ben had already converted this code over ages ago...
>
> Nothing against the -rt patch, but mainline should probably be updated
> to use RCU as well?
No, I haven't updated that code yet, and yes, we should do it :-)
Cheers,
Ben.
next prev parent reply other threads:[~2008-07-25 5:14 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-24 10:23 [PATCH 0/2][RT] powerpc - fix bug in irq reverse mapping radix tree (Resend) Sebastien Dugue
2008-07-24 10:48 ` [PATCH 1/2][RT] powerpc - XICS: move the call to irq_radix_revmap from xics_startup to xics_host_map Sebastien Dugue
2008-07-24 10:50 ` [PATCH 2/2][RT] powerpc - Make the irq reverse mapping radix tree lockless Sebastien Dugue
2008-07-24 11:11 ` Nick Piggin
2008-07-24 12:18 ` Sebastien Dugue
2008-07-25 7:49 ` Peter Zijlstra
2008-07-25 8:27 ` Benjamin Herrenschmidt
2008-07-25 8:36 ` Sebastien Dugue
2008-07-25 8:40 ` Benjamin Herrenschmidt
2008-07-25 8:47 ` Sebastien Dugue
2008-07-25 8:34 ` Sebastien Dugue
2008-07-25 5:13 ` Benjamin Herrenschmidt [this message]
-- strict thread matches above, loose matches on Subject: below --
2008-07-23 14:59 [PATCH 0/2][RT] powerpc - fix bug in irq reverse mapping radix tree Sebastien Dugue
2008-07-23 15:01 ` [PATCH 2/2][RT] powerpc - Make the irq reverse mapping radix tree lockless Sebastien Dugue
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