linux-kernel - Re: [PATCH 1/5] generic __remove

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Message-Id: <20080306110847.11d7cb26.randy.dunlap@oracle.com>
Date:	Thu, 6 Mar 2008 11:08:47 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Badari Pulavarty <pbadari@...ibm.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, linuxppc-dev@...abs.org,
	paulus@...ba.org, Yasunori Goto <y-goto@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/5] generic __remove_pages() support

On Thu, 06 Mar 2008 10:55:34 -0800 Badari Pulavarty wrote:

> Generic helper function to remove section mappings and sysfs entries
> for the section of the memory we are removing.  offline_pages() correctly 
> adjusted zone and marked the pages reserved.

Such generic (exported, non-static) interfaces could use some
(kernel-)docs, please.

> Issue: If mem_map, usemap allocation could come from different places -
> kmalloc, vmalloc, alloc_pages or bootmem. There is no easy way
> to find and free up bootmem allocations.
> 
> Signed-off-by: Badari Pulavarty <pbadari@...ibm.com>
> 
> ---
>  include/linux/memory_hotplug.h |    4 +++
>  mm/memory_hotplug.c            |   44 +++++++++++++++++++++++++++++++++++++++++
>  mm/sparse.c                    |   43 +++++++++++++++++++++++++++++++++++++---
>  3 files changed, 88 insertions(+), 3 deletions(-)

> Index: linux-2.6.25-rc2/include/linux/memory_hotplug.h
> ===================================================================
> --- linux-2.6.25-rc2.orig/include/linux/memory_hotplug.h	2008-02-27 12:58:17.000000000 -0800
> +++ linux-2.6.25-rc2/include/linux/memory_hotplug.h	2008-02-27 13:00:04.000000000 -0800
> @@ -64,6 +65,8 @@ extern int offline_pages(unsigned long, 
>  /* reasonably generic interface to expand the physical pages in a zone  */
>  extern int __add_pages(struct zone *zone, unsigned long start_pfn,
>  	unsigned long nr_pages);
> +extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
> +	unsigned long nr_pages);
>  
>  /*
>   * Walk thorugh all memory which is registered as resource.

           through :)

---
~Randy
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