| Message ID | 1346837155-534-2-git-send-email-wency@cn.fujitsu.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 09/05/2012 05:25 PM, wency@cn.fujitsu.com wrote: > From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.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@google.com> > CC: Jiang Liu <liuj97@gmail.com> > CC: Len Brown <len.brown@intel.com> > CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> > CC: Paul Mackerras <paulus@samba.org> > CC: Christoph Lameter <cl@linux.com> > Cc: Minchan Kim <minchan.kim@gmail.com> > CC: Andrew Morton <akpm@linux-foundation.org> > CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> > Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> > Signed-off-by: Wen Congyang <wency@cn.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-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Chen, 2012/09/28 11:22, Ni zhan Chen wrote: > On 09/05/2012 05:25 PM, wency@cn.fujitsu.com wrote: >> From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.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@google.com> >> CC: Jiang Liu <liuj97@gmail.com> >> CC: Len Brown <len.brown@intel.com> >> CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> >> CC: Paul Mackerras <paulus@samba.org> >> CC: Christoph Lameter <cl@linux.com> >> Cc: Minchan Kim <minchan.kim@gmail.com> >> CC: Andrew Morton <akpm@linux-foundation.org> >> CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> >> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> >> Signed-off-by: Wen Congyang <wency@cn.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-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thu, Sep 27, 2012 at 11:50 PM, Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> wrote: > Hi Chen, > > > 2012/09/28 11:22, Ni zhan Chen wrote: >> >> On 09/05/2012 05:25 PM, wency@cn.fujitsu.com wrote: >>> >>> From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.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. Then, you introduced bisect breakage. It is definitely unacceptable. NAK. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Kosaki-san, 2012/09/29 7:15, KOSAKI Motohiro wrote: > On Thu, Sep 27, 2012 at 11:50 PM, Yasuaki Ishimatsu > <isimatu.yasuaki@jp.fujitsu.com> wrote: >> Hi Chen, >> >> >> 2012/09/28 11:22, Ni zhan Chen wrote: >>> >>> On 09/05/2012 05:25 PM, wency@cn.fujitsu.com wrote: >>>> >>>> From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.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. > > Then, you introduced bisect breakage. It is definitely unacceptable. What is "bisect breakage" meaning? Thanks, Yasuaki Ishimatsu > > NAK. > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
>> Then, you introduced bisect breakage. It is definitely unacceptable. > > What is "bisect breakage" meaning? Think what's happen when only applying path [1/21]. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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);