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

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Message-Id: <1204831751.6272.6.camel@dyn9047017100.beaverton.ibm.com>
Date:	Thu, 06 Mar 2008 11:29:11 -0800
From:	Badari Pulavarty <pbadari@...ibm.com>
To:	Randy Dunlap <randy.dunlap@...cle.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, 2008-03-06 at 11:08 -0800, Randy Dunlap wrote:
> 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.

Sure. Will do.

> > 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 :)

I will fix that.

Thanks,
Badari

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