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Date: Fri, 28 Sep 2012 10:22:28 +0800 From: Ni zhan Chen <nizhan.chen@...il.com> To: wency@...fujitsu.com CC: 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, isimatu.yasuaki@...fujitsu.com Subject: Re: [RFC v9 PATCH 01/21] memory-hotplug: rename remove_memory() to offline_memory()/offline_pages() 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. > > 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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