linux-kernel - RE: [RFC] fdt:free the fdt reserved memory

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Date:	Thu, 25 Sep 2014 11:03:33 +0800
From:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
To:	'Grant Likely' <grant.likely@...aro.org>,
	"'robh+dt@...nel.org'" <robh+dt@...nel.org>,
	"'devicetree@...r.kernel.org'" <devicetree@...r.kernel.org>,
	"'pawel.moll@....com'" <pawel.moll@....com>,
	"'mark.rutland@....com'" <mark.rutland@....com>,
	"'ijc+devicetree@...lion.org.uk'" <ijc+devicetree@...lion.org.uk>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC] fdt:free the fdt reserved memory

> On Thu, 18 Sep 2014 17:25:12 +0800, "Wang, Yalin"
> <Yalin.Wang@...ymobile.com> wrote:
> > This patch make some change to unflatten_dt_node(), make sure the
> > device_node don't reference to fdt raw blob memory, so that we can
> > free the raw blob reserved memory after initcalls.
> >
> > Signed-off-by: Yalin Wang <yalin.wang@...ymobile.com>
> 
> Do you have any measurements showing a change in available memory before
> and after the patch?
> 
> g.
> 

I test it on ARM,
Fdt is 164K,
<6>[    5.134319] Freeing fdt memory: 164K


Before this patch, the total memory of kernel is,
MemTotal:         883224 kB

After apply this patch,
MemTotal:         883236 kB

We can get more 12KB memory.

Thanks
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