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Date: Thu, 19 Jul 2012 18:26:25 +0900
From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To: Bob Liu <lliubbo@...il.com>
CC: <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
<linuxppc-dev@...ts.ozlabs.org>, <linux-acpi@...r.kernel.org>,
<rientjes@...gle.com>, <liuj97@...il.com>, <len.brown@...el.com>,
<benh@...nel.crashing.org>, <paulus@...ba.org>, <cl@...ux.com>,
<minchan.kim@...il.com>, <akpm@...ux-foundation.org>,
<kosaki.motohiro@...fujitsu.com>, <wency@...fujitsu.com>
Subject: Re: [RFC PATCH v4 1/13] memory-hotplug : rename remove_memory to
offline_memory
Hi Bob,
2012/07/19 17:19, Bob Liu wrote:
> Hi Yasuaki,
>
> On Wed, Jul 18, 2012 at 6:05 PM, Yasuaki Ishimatsu
> <isimatu.yasuaki@...fujitsu.com> wrote:
>> remove_memory() does not remove memory but just offlines memory. The patch
>> changes name of it to offline_memory().
>
> Since offline_memory() just align the start/end pfn and there is no
> matched online_memory() function,
> i think it's better to remove this function and add the alignment into
> offline_pages().
If we change it, these argument becomes different as follows:
online_pages : page frame number and number of page frame number
offline_pages : memory address and memory length
I think it is ugly. So I don't want to change it. As you say, there is no
function that matches to offline_memory(). If we create export symbol
function for onlining page, in this case, the function should be named
online_memory().
Thanks,
Yasuaki Ishimatsu
>
>>
>> CC: David Rientjes <rientjes@...gle.com>
>> CC: Jiang Liu <liuj97@...il.com>
>> CC: Len Brown <len.brown@...el.com>
>> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>> CC: Paul Mackerras <paulus@...ba.org>
>> CC: Christoph Lameter <cl@...ux.com>
>> Cc: Minchan Kim <minchan.kim@...il.com>
>> CC: Andrew Morton <akpm@...ux-foundation.org>
>> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
>> CC: Wen Congyang <wency@...fujitsu.com>
>> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
>>
>> ---
>> drivers/acpi/acpi_memhotplug.c | 2 +-
>> drivers/base/memory.c | 4 ++--
>> include/linux/memory_hotplug.h | 2 +-
>> mm/memory_hotplug.c | 6 +++---
>> 4 files changed, 7 insertions(+), 7 deletions(-)
>>
>> Index: linux-3.5-rc4/drivers/acpi/acpi_memhotplug.c
>> ===================================================================
>> --- linux-3.5-rc4.orig/drivers/acpi/acpi_memhotplug.c 2012-07-03 14:21:46.102416917 +0900
>> +++ linux-3.5-rc4/drivers/acpi/acpi_memhotplug.c 2012-07-03 14:21:49.458374960 +0900
>> @@ -318,7 +318,7 @@ static int acpi_memory_disable_device(st
>> */
>> list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
>> if (info->enabled) {
>> - result = remove_memory(info->start_addr, info->length);
>> + result = offline_memory(info->start_addr, info->length);
>> if (result)
>> return result;
>> }
>> Index: linux-3.5-rc4/drivers/base/memory.c
>> ===================================================================
>> --- linux-3.5-rc4.orig/drivers/base/memory.c 2012-07-03 14:21:46.095417003 +0900
>> +++ linux-3.5-rc4/drivers/base/memory.c 2012-07-03 14:21:49.459374948 +0900
>> @@ -266,8 +266,8 @@ memory_block_action(unsigned long phys_i
>> break;
>> case MEM_OFFLINE:
>> start_paddr = page_to_pfn(first_page) << PAGE_SHIFT;
>> - ret = remove_memory(start_paddr,
>> - nr_pages << PAGE_SHIFT);
>> + ret = offline_memory(start_paddr,
>> + nr_pages << PAGE_SHIFT);
>> break;
>> default:
>> WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: "
>> Index: linux-3.5-rc4/mm/memory_hotplug.c
>> ===================================================================
>> --- linux-3.5-rc4.orig/mm/memory_hotplug.c 2012-07-03 14:21:46.102416917 +0900
>> +++ linux-3.5-rc4/mm/memory_hotplug.c 2012-07-03 14:21:49.466374860 +0900
>> @@ -990,7 +990,7 @@ out:
>> return ret;
>> }
>>
>> -int remove_memory(u64 start, u64 size)
>> +int offline_memory(u64 start, u64 size)
>> {
>> unsigned long start_pfn, end_pfn;
>>
>> @@ -999,9 +999,9 @@ int remove_memory(u64 start, u64 size)
>> return offline_pages(start_pfn, end_pfn, 120 * HZ);
>> }
>> #else
>> -int remove_memory(u64 start, u64 size)
>> +int offline_memory(u64 start, u64 size)
>> {
>> return -EINVAL;
>> }
>> #endif /* CONFIG_MEMORY_HOTREMOVE */
>> -EXPORT_SYMBOL_GPL(remove_memory);
>> +EXPORT_SYMBOL_GPL(offline_memory);
>> Index: linux-3.5-rc4/include/linux/memory_hotplug.h
>> ===================================================================
>> --- linux-3.5-rc4.orig/include/linux/memory_hotplug.h 2012-07-03 14:21:46.102416917 +0900
>> +++ linux-3.5-rc4/include/linux/memory_hotplug.h 2012-07-03 14:21:49.471374796 +0900
>> @@ -233,7 +233,7 @@ static inline int is_mem_section_removab
>> extern int mem_online_node(int nid);
>> extern int add_memory(int nid, u64 start, u64 size);
>> extern int arch_add_memory(int nid, u64 start, u64 size);
>> -extern int remove_memory(u64 start, u64 size);
>> +extern int offline_memory(u64 start, u64 size);
>> extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
>> int nr_pages);
>> extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
>>
>> --
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>> see: http://www.linux-mm.org/ .
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>
>
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