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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2012-07-31 16:42:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-31 18:42:40 -0700
commit189ebff2894a9d0f4e250dd1e154d282ef0a6779 (patch)
treee498573190660e2cfe6f64ff3fcc8cf3d44a58da
parent24669e58477e2752c1fbca9c1c988e9dd0d79d15 (diff)
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hugetlb: simplify migrate_huge_page()
Since we migrate only one hugepage, don't use linked list for passing the page around. Directly pass the page that need to be migrated as argument. This also removes the usage of page->lru in the migrate path. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Hillf Danton <dhillf@gmail.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/migrate.h4
-rw-r--r--mm/memory-failure.c15
-rw-r--r--mm/migrate.c65
3 files changed, 27 insertions, 57 deletions
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 855c337..ce7e667 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -15,7 +15,7 @@ extern int migrate_page(struct address_space *,
extern int migrate_pages(struct list_head *l, new_page_t x,
unsigned long private, bool offlining,
enum migrate_mode mode);
-extern int migrate_huge_pages(struct list_head *l, new_page_t x,
+extern int migrate_huge_page(struct page *, new_page_t x,
unsigned long private, bool offlining,
enum migrate_mode mode);
@@ -36,7 +36,7 @@ static inline void putback_lru_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) { return -ENOSYS; }
-static inline int migrate_huge_pages(struct list_head *l, new_page_t x,
+static inline int migrate_huge_page(struct page *page, new_page_t x,
unsigned long private, bool offlining,
enum migrate_mode mode) { return -ENOSYS; }
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 6de0d61..b04ff2d 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1416,7 +1416,6 @@ static int soft_offline_huge_page(struct page *page, int flags)
int ret;
unsigned long pfn = page_to_pfn(page);
struct page *hpage = compound_head(page);
- LIST_HEAD(pagelist);
ret = get_any_page(page, pfn, flags);
if (ret < 0)
@@ -1431,24 +1430,18 @@ static int soft_offline_huge_page(struct page *page, int flags)
}
/* Keep page count to indicate a given hugepage is isolated. */
-
- list_add(&hpage->lru, &pagelist);
- ret = migrate_huge_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, false,
+ ret = migrate_huge_page(hpage, new_page, MPOL_MF_MOVE_ALL, false,
MIGRATE_SYNC);
+ put_page(hpage);
if (ret) {
- struct page *page1, *page2;
- list_for_each_entry_safe(page1, page2, &pagelist, lru)
- put_page(page1);
-
pr_info("soft offline: %#lx: migration failed %d, type %lx\n",
pfn, ret, page->flags);
- if (ret > 0)
- ret = -EIO;
return ret;
}
done:
if (!PageHWPoison(hpage))
- atomic_long_add(1 << compound_trans_order(hpage), &mce_bad_pages);
+ atomic_long_add(1 << compound_trans_order(hpage),
+ &mce_bad_pages);
set_page_hwpoison_huge_page(hpage);
dequeue_hwpoisoned_huge_page(hpage);
/* keep elevated page count for bad page */
diff --git a/mm/migrate.c b/mm/migrate.c
index be26d5c..fdce3a2 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -932,15 +932,8 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
if (anon_vma)
put_anon_vma(anon_vma);
unlock_page(hpage);
-
out:
- if (rc != -EAGAIN) {
- list_del(&hpage->lru);
- put_page(hpage);
- }
-
put_page(new_hpage);
-
if (result) {
if (rc)
*result = rc;
@@ -1016,48 +1009,32 @@ out:
return nr_failed + retry;
}
-int migrate_huge_pages(struct list_head *from,
- new_page_t get_new_page, unsigned long private, bool offlining,
- enum migrate_mode mode)
+int migrate_huge_page(struct page *hpage, new_page_t get_new_page,
+ unsigned long private, bool offlining,
+ enum migrate_mode mode)
{
- int retry = 1;
- int nr_failed = 0;
- int pass = 0;
- struct page *page;
- struct page *page2;
- int rc;
-
- for (pass = 0; pass < 10 && retry; pass++) {
- retry = 0;
-
- list_for_each_entry_safe(page, page2, from, lru) {
+ int pass, rc;
+
+ for (pass = 0; pass < 10; pass++) {
+ rc = unmap_and_move_huge_page(get_new_page,
+ private, hpage, pass > 2, offlining,
+ mode);
+ switch (rc) {
+ case -ENOMEM:
+ goto out;
+ case -EAGAIN:
+ /* try again */
cond_resched();
-
- rc = unmap_and_move_huge_page(get_new_page,
- private, page, pass > 2, offlining,
- mode);
-
- switch(rc) {
- case -ENOMEM:
- goto out;
- case -EAGAIN:
- retry++;
- break;
- case 0:
- break;
- default:
- /* Permanent failure */
- nr_failed++;
- break;
- }
+ break;
+ case 0:
+ goto out;
+ default:
+ rc = -EIO;
+ goto out;
}
}
- rc = 0;
out:
- if (rc)
- return rc;
-
- return nr_failed + retry;
+ return rc;
}
#ifdef CONFIG_NUMA
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