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Date: Wed, 2 Nov 2016 13:43:47 +0800
From: Yisheng Xie <xieyisheng1@...wei.com>
To: <akpm@...ux-foundation.org>, <andrew@...n.ch>,
<daniel.kiper@...cle.com>, <srinivas.kandagatla@...aro.org>,
<gregkh@...uxfoundation.org>, <vkuznets@...hat.com>
CC: <linux-kernel@...r.kernel.org>, <ak@...ux.intel.com>,
<guohanjun@...wei.com>, <qiuxishi@...wei.com>,
<n-horiguchi@...jp.nec.com>, linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] base memory: introduce CONFIG_MEMORY_DEVICE
On 2016/10/14 18:53, Yisheng Xie wrote:
>
ping ....
Could someone help to give some comment? Really thanks for that.
Thanks.
Yisheng
>
> On 2016/10/10 19:26, Yisheng Xie wrote:
>> MEMORY_FAILURE do not depend on SPARSEMEM_MANUAL,
>> nor MEMORY_HOTPLUG_SPARSE. However, when I tried to use sysfs:
>> /sys/devices/system/memory/soft_offline_page
>> /sys/devices/system/memory/hard_offline_page
>> to test memory failure function with FLATMEM_MANUAL && MEMORY_FAILURE
>> enabled on arch like i386, it failed for no such sysfs.
>>
>> To make sysfs soft_offline_page usable once MEMORY_FAILURE is enabled,
>> this patch introduces CONFIG_MEMORY_DEVICE, and selects it when
>> MEMORY_FAILURE or MEMORY_HOTPLUG_SPARSE is enabled.
>>
>> Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
>> ---
>> drivers/base/Kconfig | 3 +++
>> drivers/base/Makefile | 2 +-
>> drivers/base/memory.c | 32 ++++++++++++++++++++++++++++++--
>> include/linux/memory.h | 4 ++++
>> 4 files changed, 38 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
>> index fdf44ca..b4eac4e 100644
>> --- a/drivers/base/Kconfig
>> +++ b/drivers/base/Kconfig
>> @@ -271,6 +271,9 @@ config DMA_CMA
>> For more information see <include/linux/dma-contiguous.h>.
>> If unsure, say "n".
>>
>> +config MEMORY_DEVICE
>> + def_bool MEMORY_HOTPLUG_SPARSE || MEMORY_FAILURE
>> +
>> if DMA_CMA
>> comment "Default contiguous memory area size:"
>>
>> diff --git a/drivers/base/Makefile b/drivers/base/Makefile
>> index 2609ba2..aafe34b 100644
>> --- a/drivers/base/Makefile
>> +++ b/drivers/base/Makefile
>> @@ -13,7 +13,7 @@ obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
>> obj-$(CONFIG_ISA_BUS_API) += isa.o
>> obj-$(CONFIG_FW_LOADER) += firmware_class.o
>> obj-$(CONFIG_NUMA) += node.o
>> -obj-$(CONFIG_MEMORY_HOTPLUG_SPARSE) += memory.o
>> +obj-$(CONFIG_MEMORY_DEVICE) += memory.o
>> ifeq ($(CONFIG_SYSFS),y)
>> obj-$(CONFIG_MODULES) += module.o
>> endif
>> diff --git a/drivers/base/memory.c b/drivers/base/memory.c
>> index dc75de9..fb00965 100644
>> --- a/drivers/base/memory.c
>> +++ b/drivers/base/memory.c
>> @@ -25,10 +25,11 @@
>> #include <linux/atomic.h>
>> #include <asm/uaccess.h>
>>
>> -static DEFINE_MUTEX(mem_sysfs_mutex);
>> -
>> #define MEMORY_CLASS_NAME "memory"
>>
>> +#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
>> +static DEFINE_MUTEX(mem_sysfs_mutex);
>> +
>> #define to_memory_block(dev) container_of(dev, struct memory_block, dev)
>>
>> static int sections_per_block;
>> @@ -381,6 +382,7 @@ static ssize_t show_phys_device(struct device *dev,
>> struct memory_block *mem = to_memory_block(dev);
>> return sprintf(buf, "%d\n", mem->phys_device);
>> }
>> +#endif
>>
>> #ifdef CONFIG_MEMORY_HOTREMOVE
>> static ssize_t show_valid_zones(struct device *dev,
>> @@ -427,6 +429,7 @@ static ssize_t show_valid_zones(struct device *dev,
>> static DEVICE_ATTR(valid_zones, 0444, show_valid_zones, NULL);
>> #endif
>>
>> +#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
>> static DEVICE_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL);
>> static DEVICE_ATTR(state, 0644, show_mem_state, store_mem_state);
>> static DEVICE_ATTR(phys_device, 0444, show_phys_device, NULL);
>> @@ -474,6 +477,7 @@ store_auto_online_blocks(struct device *dev, struct device_attribute *attr,
>>
>> static DEVICE_ATTR(auto_online_blocks, 0644, show_auto_online_blocks,
>> store_auto_online_blocks);
>> +#endif
>>
>> /*
>> * Some architectures will have custom drivers to do this, and
>> @@ -557,6 +561,7 @@ static DEVICE_ATTR(soft_offline_page, S_IWUSR, NULL, store_soft_offline_page);
>> static DEVICE_ATTR(hard_offline_page, S_IWUSR, NULL, store_hard_offline_page);
>> #endif
>>
>> +#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
>> /*
>> * Note that phys_device is optional. It is here to allow for
>> * differentiation between which *physical* devices each
>> @@ -723,6 +728,7 @@ out:
>> mutex_unlock(&mem_sysfs_mutex);
>> return ret;
>> }
>> +#endif
>>
>> #ifdef CONFIG_MEMORY_HOTREMOVE
>> static void
>> @@ -766,11 +772,13 @@ int unregister_memory_section(struct mem_section *section)
>> }
>> #endif /* CONFIG_MEMORY_HOTREMOVE */
>>
>> +#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
>> /* return true if the memory block is offlined, otherwise, return false */
>> bool is_memblock_offlined(struct memory_block *mem)
>> {
>> return mem->state == MEM_OFFLINE;
>> }
>> +#endif
>>
>> static struct attribute *memory_root_attrs[] = {
>> #ifdef CONFIG_ARCH_MEMORY_PROBE
>> @@ -782,8 +790,10 @@ static struct attribute *memory_root_attrs[] = {
>> &dev_attr_hard_offline_page.attr,
>> #endif
>>
>> +#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
>> &dev_attr_block_size_bytes.attr,
>> &dev_attr_auto_online_blocks.attr,
>> +#endif
>> NULL
>> };
>>
>> @@ -799,6 +809,7 @@ static const struct attribute_group *memory_root_attr_groups[] = {
>> /*
>> * Initialize the sysfs support for memory devices...
>> */
>> +#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
>> int __init memory_dev_init(void)
>> {
>> unsigned int i;
>> @@ -830,3 +841,20 @@ out:
>> printk(KERN_ERR "%s() failed: %d\n", __func__, ret);
>> return ret;
>> }
>> +#else
>> +static struct bus_type memory_subsys = {
>> + .name = MEMORY_CLASS_NAME,
>> + .dev_name = MEMORY_CLASS_NAME,
>> +};
>> +
>> +int __init memory_dev_init(void)
>> +{
>> + int ret = 0;
>> +
>> + ret = subsys_system_register(&memory_subsys, memory_root_attr_groups);
>> +
>> + if (ret)
>> + pr_err("%s() failed: %d\n", __func__, ret);
>> + return ret;
>> +}
>> +#endif
>> diff --git a/include/linux/memory.h b/include/linux/memory.h
>> index 093607f..9fe1089 100644
>> --- a/include/linux/memory.h
>> +++ b/include/linux/memory.h
>> @@ -77,10 +77,14 @@ struct mem_section;
>> #define IPC_CALLBACK_PRI 10
>>
>> #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
>> +#ifdef CONFIG_MEMORY_DEVICE
>> +extern int memory_dev_init(void);
>> +#else
>> static inline int memory_dev_init(void)
>> {
>> return 0;
>> }
>> +#endif
>> static inline int register_memory_notifier(struct notifier_block *nb)
>> {
>> return 0;
>>
>
>
> .
>
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