linux-kernel - Re: [patch 2/2] bootmem: Node-setup agnostic free

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Date:	Tue, 15 Apr 2008 00:36:47 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Andi Kleen" <andi@...stfloor.org>,
	"Johannes Weiner" <hannes@...urebad.de>,
	linux-kernel@...r.kernel.org, "Ingo Molnar" <mingo@...e.hu>,
	"Yasunori Goto" <y-goto@...fujitsu.com>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"Christoph Lameter" <clameter@....com>
Subject: Re: [patch 2/2] bootmem: Node-setup agnostic free_bootmem()

On Tue, 15 Apr 2008 00:28:34 -0700 "Yinghai Lu" <yhlu.kernel@...il.com> wrote:

> On Tue, Apr 15, 2008 at 12:15 AM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> >
> > On Tue, 15 Apr 2008 00:04:03 -0700 "Yinghai Lu" <yhlu.kernel@...il.com> wrote:
> >
> >  > On Mon, Apr 14, 2008 at 11:23 PM, Andrew Morton
> >  > <akpm@...ux-foundation.org> wrote:
> >  > >
> >  > > On Sun, 13 Apr 2008 18:56:57 +0200 Andi Kleen <andi@...stfloor.org> wrote:
> >  > >
> >  > >  > Johannes Weiner <hannes@...urebad.de> writes:
> >  > >  >
> >  > >  > > Make free_bootmem() look up the node holding the specified address
> >  > >  > > range which lets it work transparently on single-node and multi-node
> >  > >  > > configurations.
> >  > >  >
> >  > >  > Acked-by: Andi Kleen <andi@...stfloor.org>
> >  > >  >
> >  > >  > This is far better than the original change it replaces and which
> >  > >  > I also objected to in review.
> >  > >  >
> >  > >
> >  > >  So...  do we think these two patches are sufficiently safe and important for
> >  > >  2.6.25?
> >  >
> >  > the patch is wrong
> >  >
> >
> >  The last I saw was this:
> >
> >
> >  On Sun, 13 Apr 2008 12:57:22 +0200 Johannes Weiner <hannes@...urebad.de> wrote:
> >
> >  > Hi,
> >  >
> >  > "Yinghai Lu" <yhlu.kernel@...il.com> writes:
> >  >
> >  > > On Sat, Apr 12, 2008 at 3:33 PM, Johannes Weiner <hannes@...urebad.de> wrote:
> >  > > ...
> >
> > > >
> >  > > could have chance that bootmem with reserved_early that is crossing
> >  > > the nodes.
> >  >
> >  > Upstream reserve_bootmem_core() would BUG() on a caller trying to cross
> >  > nodes, so I don't see where this chance could come from.
> >
> >  Is that what you're referring to?
> >
> >  Was Johannes observation incorrect?  If so, why?
> 
> my patch with free_bootmem will make sure free_bootmem_core only free
> bootmem in the bdata scope.
> so free_bootmem can handle the cross_node bootmem that is done by
> reserve_early ( done in another patch, is dropped by you because took
> Jonannes).
> 
> in setup_arch for x86_64 there is one free_bootmem that is used when
> ramdisk is falled out of ram map. that could be crossed by bootloader
> and kexec, and kernel or second kernel is memmap=NN@SS to execlue some
> memory.
> 
> anyway that is extrem case, but my patch could handle that.
> 
> I wonder if any regression caused by my previous patch? maybe on other platform?
> 

Not that I'm aware of.

I restored mm-make-reserve_bootmem-can-crossed-the-nodes.patch.  Johannes,
can you please check 2.6.28-rc8-mm2, see if it looks OK?
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