linux-kernel - Re: [PATCH] mm: memory hotplug: Check if pages are correctly reserved on a per-section basis

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Date:	Mon, 10 Oct 2011 16:35:31 -0700
From:	Greg KH <greg@...ah.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, nfont@...ux.vnet.ibm.com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH] mm: memory hotplug: Check if pages are correctly
 reserved on a per-section basis

On Mon, Oct 10, 2011 at 04:28:13PM -0700, Andrew Morton wrote:
> On Mon, 10 Oct 2011 16:24:03 -0700
> Greg KH <greg@...ah.com> wrote:
> 
> > On Mon, Oct 10, 2011 at 03:00:38PM -0700, Andrew Morton wrote:
> > > On Mon, 10 Oct 2011 08:11:19 +0100
> > > Mel Gorman <mgorman@...e.de> wrote:
> > > 
> > > > It is expected that memory being brought online is PageReserved
> > > > similar to what happens when the page allocator is being brought up.
> > > > Memory is onlined in "memory blocks" which consist of one or more
> > > > sections. Unfortunately, the code that verifies PageReserved is
> > > > currently assuming that the memmap backing all these pages is virtually
> > > > contiguous which is only the case when CONFIG_SPARSEMEM_VMEMMAP is set.
> > > > As a result, memory hot-add is failing on !VMEMMAP configurations
> > > > with the message;
> > > > 
> > > > kernel: section number XXX page number 256 not reserved, was it already online?
> > > > 
> > > > This patch updates the PageReserved check to lookup struct page once
> > > > per section to guarantee the correct struct page is being checked.
> > > > 
> > > 
> > > Nathan's earlier version of this patch is already in linux-next, via
> > > Greg.  We should drop the old version and get the new one merged
> > > instead.
> > 
> > Ok, care to send me what exactly needs to be reverted and what needs to
> > be added?
> 
> Drop
> 
> commit 54f23eb7ba7619de85d8edca6e5336bc33072dbd
> Author: Nathan Fontenot <nfont@...tin.ibm.com>
> Date:   Mon Sep 26 10:22:33 2011 -0500
> 
>     memory hotplug: Correct page reservation checking
> 
> and replace it with start-of-this-thread.
> 
> That's assuming that Mel's update passes Nathan's review and testing :)

Ok, I'll wait for that review and testing, and then can someone send me
the patch at the start-of-this-thread as I no longer seem to be able to
find it :(

greg k-h
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