linux-kernel - Re: [PATCH 4/5] [PPC] update lmb for hotplug memory add/remove

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Message-ID: <47ED2249.3070602@us.ibm.com>
Date:	Fri, 28 Mar 2008 09:52:25 -0700
From:	Badari Pulavarty <pbadari@...ibm.com>
To:	Kumar Gala <galak@...nel.crashing.org>
CC:	lkml <linux-kernel@...r.kernel.org>, linuxppc-dev@...abs.org,
	Andrew Morton <akpm@...ux-foundation.org>, paulus@...ba.org,
	Yasunori Goto <y-goto@...fujitsu.com>
Subject: Re: [PATCH 4/5] [PPC] update lmb for hotplug memory add/remove

Kumar Gala wrote:
>
> On Mar 27, 2008, at 7:39 PM, Badari Pulavarty wrote:
>> ppc kernel maintains information about logical memory blocks in
>> lmb.memory structure at the boot time. Its not updated for
>> hotplug memory add/remove. hotplug memory notifier for memory
>> add/remove now updates lmb.memory.
>>
>> This information is useful for eHEA driver to find out the memory
>> layout and holes.
>>
>> NOTE: No special locking is needed for lmb_add() and lmb_remove().
>> Calls to these are serialized by caller. (pSeries_reconfig_chain).
>>
>> Signed-off-by: Badari Pulavarty <pbadari@...ibm.com>
>> ---
>> arch/powerpc/platforms/pseries/hotplug-memory.c |   43 +++++++++++++++
>> include/linux/lmb.h                             |    3 -
>> lib/lmb.c                                       |   66 
>> ++++++++++++++++++++----
>> 3 files changed, 102 insertions(+), 10 deletions(-)
>
> How is lmb_remove different than lmb_alloc?
>
> - k
lmb_remove() can be used to punch a hole in to the existing memory block.
lmb_alloc() tries to allocate for a given alignment, I don't think it can
adjust the current entries. Isn't it ?

Thanks,
Badari

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