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Date: Fri, 28 Sep 2012 12:50:00 +0900
From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To: Ni zhan Chen <nizhan.chen@...il.com>
CC: <wency@...fujitsu.com>, <x86@...nel.org>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
<linux-acpi@...r.kernel.org>, <linux-s390@...r.kernel.org>,
<linux-sh@...r.kernel.org>, <linux-ia64@...r.kernel.org>,
<cmetcalf@...era.com>, <sparclinux@...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>
Subject: Re: [RFC v9 PATCH 01/21] memory-hotplug: rename remove_memory() to
offline_memory()/offline_pages()
Hi Chen,
2012/09/28 11:22, Ni zhan Chen wrote:
> On 09/05/2012 05:25 PM, wency@...fujitsu.com wrote:
>> From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
>>
>> remove_memory() only try to offline pages. It is called in two cases:
>> 1. hot remove a memory device
>> 2. echo offline >/sys/devices/system/memory/memoryXX/state
>>
>> In the 1st case, we should also change memory block's state, and notify
>> the userspace that the memory block's state is changed after offlining
>> pages.
>>
>> So rename remove_memory() to offline_memory()/offline_pages(). And in
>> the 1st case, offline_memory() will be used. The function offline_memory()
>> is not implemented. In the 2nd case, offline_pages() will be used.
>
> But this time there is not a function associated with add_memory.
To associate with add_memory() later, we renamed it.
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>
>> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
>> Signed-off-by: Wen Congyang <wency@...fujitsu.com>
>> ---
>> drivers/acpi/acpi_memhotplug.c | 2 +-
>> drivers/base/memory.c | 9 +++------
>> include/linux/memory_hotplug.h | 3 ++-
>> mm/memory_hotplug.c | 22 ++++++++++++++--------
>> 4 files changed, 20 insertions(+), 16 deletions(-)
>>
>> diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
>> index 24c807f..2a7beac 100644
>> --- a/drivers/acpi/acpi_memhotplug.c
>> +++ b/drivers/acpi/acpi_memhotplug.c
>> @@ -318,7 +318,7 @@ static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
>> */
>> 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;
>> }
>> diff --git a/drivers/base/memory.c b/drivers/base/memory.c
>> index 7dda4f7..44e7de6 100644
>> --- a/drivers/base/memory.c
>> +++ b/drivers/base/memory.c
>> @@ -248,26 +248,23 @@ static bool pages_correctly_reserved(unsigned long start_pfn,
>> static int
>> memory_block_action(unsigned long phys_index, unsigned long action)
>> {
>> - unsigned long start_pfn, start_paddr;
>> + unsigned long start_pfn;
>> unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
>> struct page *first_page;
>> int ret;
>> first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT);
>> + start_pfn = page_to_pfn(first_page);
>> switch (action) {
>> case MEM_ONLINE:
>> - start_pfn = page_to_pfn(first_page);
>> -
>> if (!pages_correctly_reserved(start_pfn, nr_pages))
>> return -EBUSY;
>> ret = online_pages(start_pfn, nr_pages);
>> break;
>> case MEM_OFFLINE:
>> - start_paddr = page_to_pfn(first_page) << PAGE_SHIFT;
>> - ret = remove_memory(start_paddr,
>> - nr_pages << PAGE_SHIFT);
>> + ret = offline_pages(start_pfn, nr_pages);
>> break;
>> default:
>> WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: "
>> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
>> index 910550f..c183f39 100644
>> --- a/include/linux/memory_hotplug.h
>> +++ b/include/linux/memory_hotplug.h
>> @@ -233,7 +233,8 @@ static inline int is_mem_section_removable(unsigned long pfn,
>> 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_pages(unsigned long start_pfn, unsigned long nr_pages);
>> +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);
>> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
>> index 3ad25f9..bb42316 100644
>> --- a/mm/memory_hotplug.c
>> +++ b/mm/memory_hotplug.c
>> @@ -866,7 +866,7 @@ check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
>> return offlined;
>> }
>> -static int __ref offline_pages(unsigned long start_pfn,
>> +static int __ref __offline_pages(unsigned long start_pfn,
>> unsigned long end_pfn, unsigned long timeout)
>> {
>> unsigned long pfn, nr_pages, expire;
>> @@ -994,18 +994,24 @@ out:
>> return ret;
>> }
>> -int remove_memory(u64 start, u64 size)
>> +int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
>> {
>> - unsigned long start_pfn, end_pfn;
>> + return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ);
>> +}
>> - start_pfn = PFN_DOWN(start);
>> - end_pfn = start_pfn + PFN_DOWN(size);
>> - return offline_pages(start_pfn, end_pfn, 120 * HZ);
>> +int offline_memory(u64 start, u64 size)
>> +{
>> + return -EINVAL;
>> }
>> #else
>> -int remove_memory(u64 start, u64 size)
>> +int offline_pages(unsigned long start, unsigned long size)
>> +{
>> + return -EINVAL;
>> +}
>> +
>> +int offline_memory(u64 start, u64 size)
>> {
>> return -EINVAL;
>> }
>> #endif /* CONFIG_MEMORY_HOTREMOVE */
>> -EXPORT_SYMBOL_GPL(remove_memory);
>> +EXPORT_SYMBOL_GPL(offline_memory);
>
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