mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Christoph Hellwig](/assets/img/avatar_default.png)
Add a new src_owner field to struct migrate_vma. If the field is set,
only device private pages with page->pgmap->owner equal to that field are
migrated. If the field is not set only "normal" pages are migrated.
Fixes: df6ad69838
("mm/device-public-memory: device memory cache coherent with CPU")
Link: https://lore.kernel.org/r/20200316193216.920734-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Tested-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
215 lines
6.2 KiB
C
215 lines
6.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_MIGRATE_H
|
|
#define _LINUX_MIGRATE_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/mempolicy.h>
|
|
#include <linux/migrate_mode.h>
|
|
#include <linux/hugetlb.h>
|
|
|
|
typedef struct page *new_page_t(struct page *page, unsigned long private);
|
|
typedef void free_page_t(struct page *page, unsigned long private);
|
|
|
|
/*
|
|
* Return values from addresss_space_operations.migratepage():
|
|
* - negative errno on page migration failure;
|
|
* - zero on page migration success;
|
|
*/
|
|
#define MIGRATEPAGE_SUCCESS 0
|
|
|
|
enum migrate_reason {
|
|
MR_COMPACTION,
|
|
MR_MEMORY_FAILURE,
|
|
MR_MEMORY_HOTPLUG,
|
|
MR_SYSCALL, /* also applies to cpusets */
|
|
MR_MEMPOLICY_MBIND,
|
|
MR_NUMA_MISPLACED,
|
|
MR_CONTIG_RANGE,
|
|
MR_TYPES
|
|
};
|
|
|
|
/* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
|
|
extern const char *migrate_reason_names[MR_TYPES];
|
|
|
|
static inline struct page *new_page_nodemask(struct page *page,
|
|
int preferred_nid, nodemask_t *nodemask)
|
|
{
|
|
gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL;
|
|
unsigned int order = 0;
|
|
struct page *new_page = NULL;
|
|
|
|
if (PageHuge(page))
|
|
return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
|
|
preferred_nid, nodemask);
|
|
|
|
if (PageTransHuge(page)) {
|
|
gfp_mask |= GFP_TRANSHUGE;
|
|
order = HPAGE_PMD_ORDER;
|
|
}
|
|
|
|
if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
|
|
gfp_mask |= __GFP_HIGHMEM;
|
|
|
|
new_page = __alloc_pages_nodemask(gfp_mask, order,
|
|
preferred_nid, nodemask);
|
|
|
|
if (new_page && PageTransHuge(new_page))
|
|
prep_transhuge_page(new_page);
|
|
|
|
return new_page;
|
|
}
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
|
|
extern void putback_movable_pages(struct list_head *l);
|
|
extern int migrate_page(struct address_space *mapping,
|
|
struct page *newpage, struct page *page,
|
|
enum migrate_mode mode);
|
|
extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
|
|
unsigned long private, enum migrate_mode mode, int reason);
|
|
extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
|
|
extern void putback_movable_page(struct page *page);
|
|
|
|
extern int migrate_prep(void);
|
|
extern int migrate_prep_local(void);
|
|
extern void migrate_page_states(struct page *newpage, struct page *page);
|
|
extern void migrate_page_copy(struct page *newpage, struct page *page);
|
|
extern int migrate_huge_page_move_mapping(struct address_space *mapping,
|
|
struct page *newpage, struct page *page);
|
|
extern int migrate_page_move_mapping(struct address_space *mapping,
|
|
struct page *newpage, struct page *page, int extra_count);
|
|
#else
|
|
|
|
static inline void putback_movable_pages(struct list_head *l) {}
|
|
static inline int migrate_pages(struct list_head *l, new_page_t new,
|
|
free_page_t free, unsigned long private, enum migrate_mode mode,
|
|
int reason)
|
|
{ return -ENOSYS; }
|
|
static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
|
|
{ return -EBUSY; }
|
|
|
|
static inline int migrate_prep(void) { return -ENOSYS; }
|
|
static inline int migrate_prep_local(void) { return -ENOSYS; }
|
|
|
|
static inline void migrate_page_states(struct page *newpage, struct page *page)
|
|
{
|
|
}
|
|
|
|
static inline void migrate_page_copy(struct page *newpage,
|
|
struct page *page) {}
|
|
|
|
static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
|
|
struct page *newpage, struct page *page)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
#endif /* CONFIG_MIGRATION */
|
|
|
|
#ifdef CONFIG_COMPACTION
|
|
extern int PageMovable(struct page *page);
|
|
extern void __SetPageMovable(struct page *page, struct address_space *mapping);
|
|
extern void __ClearPageMovable(struct page *page);
|
|
#else
|
|
static inline int PageMovable(struct page *page) { return 0; };
|
|
static inline void __SetPageMovable(struct page *page,
|
|
struct address_space *mapping)
|
|
{
|
|
}
|
|
static inline void __ClearPageMovable(struct page *page)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
extern bool pmd_trans_migrating(pmd_t pmd);
|
|
extern int migrate_misplaced_page(struct page *page,
|
|
struct vm_area_struct *vma, int node);
|
|
#else
|
|
static inline bool pmd_trans_migrating(pmd_t pmd)
|
|
{
|
|
return false;
|
|
}
|
|
static inline int migrate_misplaced_page(struct page *page,
|
|
struct vm_area_struct *vma, int node)
|
|
{
|
|
return -EAGAIN; /* can't migrate now */
|
|
}
|
|
#endif /* CONFIG_NUMA_BALANCING */
|
|
|
|
#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
|
|
extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
|
|
struct vm_area_struct *vma,
|
|
pmd_t *pmd, pmd_t entry,
|
|
unsigned long address,
|
|
struct page *page, int node);
|
|
#else
|
|
static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
|
|
struct vm_area_struct *vma,
|
|
pmd_t *pmd, pmd_t entry,
|
|
unsigned long address,
|
|
struct page *page, int node)
|
|
{
|
|
return -EAGAIN;
|
|
}
|
|
#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
|
|
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
|
|
/*
|
|
* Watch out for PAE architecture, which has an unsigned long, and might not
|
|
* have enough bits to store all physical address and flags. So far we have
|
|
* enough room for all our flags.
|
|
*/
|
|
#define MIGRATE_PFN_VALID (1UL << 0)
|
|
#define MIGRATE_PFN_MIGRATE (1UL << 1)
|
|
#define MIGRATE_PFN_LOCKED (1UL << 2)
|
|
#define MIGRATE_PFN_WRITE (1UL << 3)
|
|
#define MIGRATE_PFN_SHIFT 6
|
|
|
|
static inline struct page *migrate_pfn_to_page(unsigned long mpfn)
|
|
{
|
|
if (!(mpfn & MIGRATE_PFN_VALID))
|
|
return NULL;
|
|
return pfn_to_page(mpfn >> MIGRATE_PFN_SHIFT);
|
|
}
|
|
|
|
static inline unsigned long migrate_pfn(unsigned long pfn)
|
|
{
|
|
return (pfn << MIGRATE_PFN_SHIFT) | MIGRATE_PFN_VALID;
|
|
}
|
|
|
|
struct migrate_vma {
|
|
struct vm_area_struct *vma;
|
|
/*
|
|
* Both src and dst array must be big enough for
|
|
* (end - start) >> PAGE_SHIFT entries.
|
|
*
|
|
* The src array must not be modified by the caller after
|
|
* migrate_vma_setup(), and must not change the dst array after
|
|
* migrate_vma_pages() returns.
|
|
*/
|
|
unsigned long *dst;
|
|
unsigned long *src;
|
|
unsigned long cpages;
|
|
unsigned long npages;
|
|
unsigned long start;
|
|
unsigned long end;
|
|
|
|
/*
|
|
* Set to the owner value also stored in page->pgmap->owner for
|
|
* migrating out of device private memory. If set only device
|
|
* private pages with this owner are migrated. If not set
|
|
* device private pages are not migrated at all.
|
|
*/
|
|
void *src_owner;
|
|
};
|
|
|
|
int migrate_vma_setup(struct migrate_vma *args);
|
|
void migrate_vma_pages(struct migrate_vma *migrate);
|
|
void migrate_vma_finalize(struct migrate_vma *migrate);
|
|
|
|
#endif /* CONFIG_MIGRATION */
|
|
|
|
#endif /* _LINUX_MIGRATE_H */
|