From: Mark Nelson <markn@au1.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v2] powerpc: Track backing pages allocated by vmemmap_populate()
Date: Wed, 14 Apr 2010 09:38:46 +1000 [thread overview]
Message-ID: <201004140938.46705.markn@au1.ibm.com> (raw)
In-Reply-To: <1271157404.13059.102.camel@pasglop>
On Tuesday 13 April 2010 21:16:44 Benjamin Herrenschmidt wrote:
> On Tue, 2010-04-13 at 16:02 +1000, Mark Nelson wrote:
> > That's a good question, and one that I probably should have added to
> > the
> > commit message.
> > But, following through, it looks like we end up calling into
> > __remove_section() from mm/memory_hotplug.c and if
> > CONFIG_SPARSEMEM_VMEMMAP is enabled we just return EBUSY as freeing
> > memmap with vmemmap isn't implemented yet.
> >
> > So for the moment, I'm not sure we have to worry about it.
>
> We probably don't. IE. The vmemmap will remain for those struct pages,
> which means they won't need to be allocated again if some memory is
> plugged back there. If not, we just waste a bit of memory. Not a big
> deal.
>
Excellent! That makes sense.
Thanks Ben!
Mark.
next prev parent reply other threads:[~2010-04-13 23:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-26 7:12 [PATCH] powerpc: Track backing pages used allocated by vmemmap_populate() Mark Nelson
2010-04-13 4:16 ` [PATCH v2] powerpc: Track backing pages " Mark Nelson
2010-04-13 5:24 ` Michael Ellerman
2010-04-13 6:02 ` Mark Nelson
2010-04-13 11:16 ` Benjamin Herrenschmidt
2010-04-13 23:38 ` Mark Nelson [this message]
2010-04-22 2:21 ` [PATCH v3] " Mark Nelson
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