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Date: Fri, 25 Jan 2013 18:07:51 -0800 (PST)
From: Hugh Dickins <hughd@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
cc: Petr Holasek <pholasek@...hat.com>,
Andrea Arcangeli <aarcange@...hat.com>,
Izik Eidus <izik.eidus@...ellosystems.com>,
Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
linux-mm@...ck.org
Subject: [PATCH 10/11] 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@...gle.com>
---
include/linux/migrate.h | 14 ++++++--------
mm/compaction.c | 2 +-
mm/memory-failure.c | 7 +++----
mm/memory_hotplug.c | 3 +--
mm/mempolicy.c | 8 +++-----
mm/migrate.c | 35 +++++++++++++----------------------
mm/page_alloc.c | 6 ++----
7 files changed, 29 insertions(+), 46 deletions(-)
--- mmotm.orig/include/linux/migrate.h 2013-01-24 12:28:38.740127550 -0800
+++ mmotm/include/linux/migrate.h 2013-01-25 14:38:51.468208776 -0800
@@ -40,11 +40,9 @@ extern void putback_movable_pages(struct
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_mappin
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; }
--- mmotm.orig/mm/compaction.c 2013-01-24 12:28:38.740127550 -0800
+++ mmotm/mm/compaction.c 2013-01-25 14:38:51.472208776 -0800
@@ -980,7 +980,7 @@ static int compact_zone(struct zone *zon
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);
--- mmotm.orig/mm/memory-failure.c 2013-01-24 12:28:38.740127550 -0800
+++ mmotm/mm/memory-failure.c 2013-01-25 14:38:51.472208776 -0800
@@ -1432,7 +1432,7 @@ static int soft_offline_huge_page(struct
goto done;
/* 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) {
@@ -1564,11 +1564,10 @@ int soft_offline_page(struct page *page,
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",
--- mmotm.orig/mm/memory_hotplug.c 2013-01-24 12:28:38.740127550 -0800
+++ mmotm/mm/memory_hotplug.c 2013-01-25 14:38:51.472208776 -0800
@@ -1283,8 +1283,7 @@ do_migrate_range(unsigned long start_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);
}
--- mmotm.orig/mm/mempolicy.c 2013-01-25 14:38:49.596208731 -0800
+++ mmotm/mm/mempolicy.c 2013-01-25 14:38:51.472208776 -0800
@@ -1014,8 +1014,7 @@ static int migrate_to_node(struct mm_str
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
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);
}
--- mmotm.orig/mm/migrate.c 2013-01-25 14:38:49.596208731 -0800
+++ mmotm/mm/migrate.c 2013-01-25 14:38:51.476208776 -0800
@@ -701,7 +701,7 @@ static int move_to_new_page(struct 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
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)) {
/*
@@ -927,8 +926,7 @@ 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;
@@ -990,9 +988,8 @@ 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;
@@ -1013,8 +1010,7 @@ 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:
@@ -1047,15 +1043,13 @@ 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;
@@ -1178,8 +1172,7 @@ 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);
}
@@ -1614,10 +1607,8 @@ int migrate_misplaced_page(struct page *
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;
--- mmotm.orig/mm/page_alloc.c 2013-01-24 12:28:38.740127550 -0800
+++ mmotm/mm/page_alloc.c 2013-01-25 14:38:51.476208776 -0800
@@ -6064,10 +6064,8 @@ static int __alloc_contig_migrate_range(
&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);
--
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