linux-kernel - Re: [Cbe-oss-dev] [RFC, PATCH] CELL Oprofile SPU profiling updated patch

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Date:	Thu, 15 Feb 2007 19:13:52 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Maynard Johnson <maynardj@...ibm.com>
Cc:	cbe-oss-dev@...abs.org, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, oprofile-list@...ts.sourceforge.net,
	Carl Love <cel@...ibm.com>
Subject: Re: [Cbe-oss-dev] [RFC, PATCH] CELL Oprofile SPU profiling updated patch

On Thursday 15 February 2007 17:15, Maynard Johnson wrote:
> >>+void spu_set_profile_private(struct spu_context * ctx, void * profile_info,
> >>+                          struct kref * prof_info_kref,
> >>+                          void (* prof_info_release) (struct kref * kref))
> >>+{
> >>+     ctx->profile_private = profile_info;
> >>+     ctx->prof_priv_kref = prof_info_kref;
> >>+     ctx->prof_priv_release = prof_info_release;
> >>+}
> >>+EXPORT_SYMBOL_GPL(spu_set_profile_private);
> >>    
> >>
> >
> >I think you don't need the profile_private member here, if you just use
> >container_of with ctx->prof_priv_kref in all users.
> >  
> >
> Sorry, I don't follow. We want the profile_private to be stored in the 
> spu_context, don't we?  How else would I be able to do that?  And 
> besides, wouldn't container_of need the struct name of profile_private?  
> SPUFS doesn't have access to the type.

The idea was to have spu_get_profile_private return the kref pointer,
and then change the user of that to do

+       if (!spu_info[spu_num] && the_spu) {
+               spu_info[spu_num] = container_of(
+				spu_get_profile_private(the_spu->ctx),
+				struct cached_info, cache_kref);
+               if (spu_info[spu_num])
+                       kref_get(&spu_info[spu_num]->cache_ref);
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