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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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925cc71e51
Memory balloon drivers can allocate a large amount of memory which is not movable but could be freed to accomodate memory hotplug remove. Prior to calling the memory hotplug notifier chain the memory in the pageblock is isolated. Currently, if the migrate type is not MIGRATE_MOVABLE the isolation will not proceed, causing the memory removal for that page range to fail. Rather than failing pageblock isolation if the migrateteype is not MIGRATE_MOVABLE, this patch checks if all of the pages in the pageblock, and not on the LRU, are owned by a registered balloon driver (or other entity) using a notifier chain. If all of the non-movable pages are owned by a balloon, they can be freed later through the memory notifier chain and the range can still be isolated in set_migratetype_isolate(). Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Ingo Molnar <mingo@elte.hu> Cc: Brian King <brking@linux.vnet.ibm.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Gerald Schaefer <geralds@linux.vnet.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
147 lines
4.3 KiB
C
147 lines
4.3 KiB
C
/*
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* include/linux/memory.h - generic memory definition
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*
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* This is mainly for topological representation. We define the
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* basic "struct memory_block" here, which can be embedded in per-arch
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* definitions or NUMA information.
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*
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* Basic handling of the devices is done in drivers/base/memory.c
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* and system devices are handled in drivers/base/sys.c.
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*
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* Memory block are exported via sysfs in the class/memory/devices/
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* directory.
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*
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*/
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#ifndef _LINUX_MEMORY_H_
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#define _LINUX_MEMORY_H_
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#include <linux/sysdev.h>
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#include <linux/node.h>
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#include <linux/compiler.h>
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#include <linux/mutex.h>
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struct memory_block {
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unsigned long phys_index;
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unsigned long state;
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/*
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* This serializes all state change requests. It isn't
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* held during creation because the control files are
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* created long after the critical areas during
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* initialization.
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*/
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struct mutex state_mutex;
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int phys_device; /* to which fru does this belong? */
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void *hw; /* optional pointer to fw/hw data */
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int (*phys_callback)(struct memory_block *);
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struct sys_device sysdev;
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};
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/* These states are exposed to userspace as text strings in sysfs */
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#define MEM_ONLINE (1<<0) /* exposed to userspace */
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#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
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#define MEM_OFFLINE (1<<2) /* exposed to userspace */
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#define MEM_GOING_ONLINE (1<<3)
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#define MEM_CANCEL_ONLINE (1<<4)
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#define MEM_CANCEL_OFFLINE (1<<5)
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struct memory_notify {
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unsigned long start_pfn;
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unsigned long nr_pages;
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int status_change_nid;
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};
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/*
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* During pageblock isolation, count the number of pages within the
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* range [start_pfn, start_pfn + nr_pages) which are owned by code
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* in the notifier chain.
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*/
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#define MEM_ISOLATE_COUNT (1<<0)
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struct memory_isolate_notify {
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unsigned long start_pfn; /* Start of range to check */
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unsigned int nr_pages; /* # pages in range to check */
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unsigned int pages_found; /* # pages owned found by callbacks */
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};
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struct notifier_block;
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struct mem_section;
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/*
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* Priorities for the hotplug memory callback routines (stored in decreasing
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* order in the callback chain)
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*/
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#define SLAB_CALLBACK_PRI 1
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#define IPC_CALLBACK_PRI 10
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#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
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static inline int memory_dev_init(void)
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{
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return 0;
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}
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static inline int register_memory_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline void unregister_memory_notifier(struct notifier_block *nb)
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{
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}
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static inline int memory_notify(unsigned long val, void *v)
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{
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return 0;
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}
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static inline int register_memory_isolate_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
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{
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}
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static inline int memory_isolate_notify(unsigned long val, void *v)
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{
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return 0;
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}
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#else
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extern int register_memory_notifier(struct notifier_block *nb);
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extern void unregister_memory_notifier(struct notifier_block *nb);
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extern int register_memory_isolate_notifier(struct notifier_block *nb);
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extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
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extern int register_new_memory(int, struct mem_section *);
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extern int unregister_memory_section(struct mem_section *);
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extern int memory_dev_init(void);
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extern int remove_memory_block(unsigned long, struct mem_section *, int);
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extern int memory_notify(unsigned long val, void *v);
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extern int memory_isolate_notify(unsigned long val, void *v);
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extern struct memory_block *find_memory_block(struct mem_section *);
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#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
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enum mem_add_context { BOOT, HOTPLUG };
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#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
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#ifdef CONFIG_MEMORY_HOTPLUG
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#define hotplug_memory_notifier(fn, pri) { \
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static __meminitdata struct notifier_block fn##_mem_nb =\
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{ .notifier_call = fn, .priority = pri }; \
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register_memory_notifier(&fn##_mem_nb); \
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}
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#else
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#define hotplug_memory_notifier(fn, pri) do { } while (0)
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#endif
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/*
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* 'struct memory_accessor' is a generic interface to provide
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* in-kernel access to persistent memory such as i2c or SPI EEPROMs
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*/
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struct memory_accessor {
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ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
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size_t count);
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ssize_t (*write)(struct memory_accessor *, const char *buf,
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off_t offset, size_t count);
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};
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/*
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* Kernel text modification mutex, used for code patching. Users of this lock
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* can sleep.
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*/
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extern struct mutex text_mutex;
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#endif /* _LINUX_MEMORY_H_ */
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