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mm: remove offlining arg to migrate_pages 

No functional change, but the only purpose of the offlining argument to
migrate_pages() etc, was to ensure that __unmap_and_move() could migrate a
KSM page for memory hotremove (which took ksm_thread_mutex) but not for
other callers.  Now all cases are safe, remove the arg.

Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Petr Holasek <pholasek@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Izik Eidus <izik.eidus@ravellosystems.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2013-02-22 16:35:14 -08:00 committed by Linus Torvalds
parent b79bc0a0c7
commit 9c620e2bc5
7 changed files with 29 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/linux/migrate.h
View File

@ -40,11 +40,9 @@ extern void putback_movable_pages(struct list_head *l);
extern int migrate_page(struct address_space *,
struct page *, struct page *, enum migrate_mode);
extern int migrate_pages(struct list_head *l, new_page_t x,
unsigned long private, bool offlining,
enum migrate_mode mode, int reason);
unsigned long private, enum migrate_mode mode, int reason);
extern int migrate_huge_page(struct page *, new_page_t x,
unsigned long private, bool offlining,
enum migrate_mode mode);
unsigned long private, enum migrate_mode mode);
extern int fail_migrate_page(struct address_space *,
struct page *, struct page *);
@ -62,11 +60,11 @@ extern int migrate_huge_page_move_mapping(struct address_space *mapping,
static inline void putback_lru_pages(struct list_head *l) {}
static inline void putback_movable_pages(struct list_head *l) {}
static inline int migrate_pages(struct list_head *l, new_page_t x,
unsigned long private, bool offlining,
enum migrate_mode mode, int reason) { return -ENOSYS; }
unsigned long private, enum migrate_mode mode, int reason)
{ return -ENOSYS; }
static inline int migrate_huge_page(struct page *page, new_page_t x,
unsigned long private, bool offlining,
enum migrate_mode mode) { return -ENOSYS; }
unsigned long private, enum migrate_mode mode)
{ return -ENOSYS; }
static inline int migrate_prep(void) { return -ENOSYS; }
static inline int migrate_prep_local(void) { return -ENOSYS; }

2
mm/compaction.c
View File

@ -980,7 +980,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
nr_migrate = cc->nr_migratepages;
err = migrate_pages(&cc->migratepages, compaction_alloc,
(unsigned long)cc, false,
(unsigned long)cc,
cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC,
MR_COMPACTION);
update_nr_listpages(cc);

7
mm/memory-failure.c
View File

@ -1465,7 +1465,7 @@ static int soft_offline_huge_page(struct page *page, int flags)
unlock_page(hpage);
/* Keep page count to indicate a given hugepage is isolated. */
ret = migrate_huge_page(hpage, new_page, MPOL_MF_MOVE_ALL, false,
ret = migrate_huge_page(hpage, new_page, MPOL_MF_MOVE_ALL,
MIGRATE_SYNC);
put_page(hpage);
if (ret) {
@ -1597,11 +1597,10 @@ static int __soft_offline_page(struct page *page, int flags)
if (!ret) {
LIST_HEAD(pagelist);
inc_zone_page_state(page, NR_ISOLATED_ANON +
page_is_file_cache(page));
page_is_file_cache(page));
list_add(&page->lru, &pagelist);
ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL,
false, MIGRATE_SYNC,
MR_MEMORY_FAILURE);
MIGRATE_SYNC, MR_MEMORY_FAILURE);
if (ret) {
putback_lru_pages(&pagelist);
pr_info("soft offline: %#lx: migration failed %d, type %lx\n",

3
mm/memory_hotplug.c
View File

@ -1286,8 +1286,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
* migrate_pages returns # of failed pages.
*/
ret = migrate_pages(&source, alloc_migrate_target, 0,
true, MIGRATE_SYNC,
MR_MEMORY_HOTPLUG);
MIGRATE_SYNC, MR_MEMORY_HOTPLUG);
if (ret)
putback_lru_pages(&source);
}

8
mm/mempolicy.c
View File

@ -1014,8 +1014,7 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest,
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, new_node_page, dest,
false, MIGRATE_SYNC,
MR_SYSCALL);
MIGRATE_SYNC, MR_SYSCALL);
if (err)
putback_lru_pages(&pagelist);
}
@ -1259,9 +1258,8 @@ static long do_mbind(unsigned long start, unsigned long len,
if (!list_empty(&pagelist)) {
WARN_ON_ONCE(flags & MPOL_MF_LAZY);
nr_failed = migrate_pages(&pagelist, new_vma_page,
(unsigned long)vma,
false, MIGRATE_SYNC,
MR_MEMPOLICY_MBIND);
(unsigned long)vma,
MIGRATE_SYNC, MR_MEMPOLICY_MBIND);
if (nr_failed)
putback_lru_pages(&pagelist);
}

35
mm/migrate.c
View File

@ -701,7 +701,7 @@ static int move_to_new_page(struct page *newpage, struct page *page,
}
static int __unmap_and_move(struct page *page, struct page *newpage,
int force, bool offlining, enum migrate_mode mode)
int force, enum migrate_mode mode)
{
int rc = -EAGAIN;
int remap_swapcache = 1;
@ -847,8 +847,7 @@ out:
* to the newly allocated page in newpage.
*/
static int unmap_and_move(new_page_t get_new_page, unsigned long private,
struct page *page, int force, bool offlining,
enum migrate_mode mode)
struct page *page, int force, enum migrate_mode mode)
{
int rc = 0;
int *result = NULL;
@ -866,7 +865,7 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
if (unlikely(split_huge_page(page)))
goto out;
rc = __unmap_and_move(page, newpage, force, offlining, mode);
rc = __unmap_and_move(page, newpage, force, mode);
if (unlikely(rc == MIGRATEPAGE_BALLOON_SUCCESS)) {
/*
@ -926,8 +925,7 @@ out:
*/
static int unmap_and_move_huge_page(new_page_t get_new_page,
unsigned long private, struct page *hpage,
int force, bool offlining,
enum migrate_mode mode)
int force, enum migrate_mode mode)
{
int rc = 0;
int *result = NULL;
@ -989,9 +987,8 @@ out:
*
* Return: Number of pages not migrated or error code.
*/
int migrate_pages(struct list_head *from,
new_page_t get_new_page, unsigned long private, bool offlining,
enum migrate_mode mode, int reason)
int migrate_pages(struct list_head *from, new_page_t get_new_page,
unsigned long private, enum migrate_mode mode, int reason)
{
int retry = 1;
int nr_failed = 0;
@ -1012,8 +1009,7 @@ int migrate_pages(struct list_head *from,
cond_resched();
rc = unmap_and_move(get_new_page, private,
page, pass > 2, offlining,
mode);
page, pass > 2, mode);
switch(rc) {
case -ENOMEM:
@ -1046,15 +1042,13 @@ out:
}
int migrate_huge_page(struct page *hpage, new_page_t get_new_page,
unsigned long private, bool offlining,
enum migrate_mode mode)
unsigned long private, enum migrate_mode mode)
{
int pass, rc;
for (pass = 0; pass < 10; pass++) {
rc = unmap_and_move_huge_page(get_new_page,
private, hpage, pass > 2, offlining,
mode);
rc = unmap_and_move_huge_page(get_new_page, private,
hpage, pass > 2, mode);
switch (rc) {
case -ENOMEM:
goto out;
@ -1177,8 +1171,7 @@ set_status:
err = 0;
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, new_page_node,
(unsigned long)pm, 0, MIGRATE_SYNC,
MR_SYSCALL);
(unsigned long)pm, MIGRATE_SYNC, MR_SYSCALL);
if (err)
putback_lru_pages(&pagelist);
}
@ -1613,10 +1606,8 @@ int migrate_misplaced_page(struct page *page, int node)
goto out;
list_add(&page->lru, &migratepages);
nr_remaining = migrate_pages(&migratepages,
alloc_misplaced_dst_page,
node, false, MIGRATE_ASYNC,
MR_NUMA_MISPLACED);
nr_remaining = migrate_pages(&migratepages, alloc_misplaced_dst_page,
node, MIGRATE_ASYNC, MR_NUMA_MISPLACED);
if (nr_remaining) {
putback_lru_pages(&migratepages);
isolated = 0;

6
mm/page_alloc.c
View File

@ -6084,10 +6084,8 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
&cc->migratepages);
cc->nr_migratepages -= nr_reclaimed;
ret = migrate_pages(&cc->migratepages,
alloc_migrate_target,
0, false, MIGRATE_SYNC,
MR_CMA);
ret = migrate_pages(&cc->migratepages, alloc_migrate_target,
0, MIGRATE_SYNC, MR_CMA);
}
if (ret < 0) {
putback_movable_pages(&cc->migratepages);