> -----Original Message----- > From: Grant Likely [mailto:[email protected]] On Behalf Of Grant Likely > Sent: Thursday, December 04, 2014 6:05 PM > To: Wang, Yalin; '[email protected]'; '[email protected]'; > '[email protected]'; '[email protected]'; > '[email protected]'; '[email protected]' > Subject: RE: [RFC] fdt:free the fdt reserved memory > > On Thu, 4 Dec 2014 14:56:11 +0800 > , "Wang, Yalin" <[email protected]> > wrote: > > > -----Original Message----- > > > From: Grant Likely [mailto:[email protected]] On Behalf Of Grant > > > Likely > > > Sent: Wednesday, September 24, 2014 10:45 PM > > > To: Wang, Yalin; '[email protected]'; '[email protected]'; > > > '[email protected]'; '[email protected]'; > > > '[email protected]'; '[email protected]' > > > Subject: Re: [RFC] fdt:free the fdt reserved memory > > > > > > On Thu, 18 Sep 2014 17:25:12 +0800, "Wang, Yalin" > > > <[email protected]> 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 <[email protected]> > > > > > > Do you have any measurements showing a change in available memory > > > before and after the patch? > > > > > Does anyone have a look at this patch? > > It can save 12K on my platform, > > My dtb is 164K > > Yes, I've been thinking about this one. Unfortunately there is a conflict > with another feature that I'm merging for v3.19. See commit 08d53aa5, > "of/fdt: export fdt blob as /sys/firmware/fdt" in linux-next. > That commit requires the original blob to be kept around. > > In order to free the original dtb, the /sys/firmware/fdt feature will need > to be changed to let it be configured out. All things considered, that is > probably the right thing to do, but doing so increases the memory load for > the platforms that want /sys/firmware/fdt. I'd like to see what the impact > would be on the code to switch to this method when /sys/firmware/fdt is > configured out. > Oh, I understand, If enable /sys/firmware/fdt feature patch, doesn't need My patch is fine, So need 2 method to unflatten dtb blob.
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