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Message-ID: <CAA_GA1fayhA1A3vT5BcDCoL_JVd6pZJn2_=NXK0bjJNRXo=7LA@mail.gmail.com>
Date: Thu, 19 Jul 2012 16:19:38 +0800
From: Bob Liu <lliubbo@...il.com>
To: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.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 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().
>
> 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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--
Regards,
--Bob
--
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