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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>
This commit is contained in:
Aneesh Kumar K.V 2012-07-31 16:42:06 -07:00 committed by Linus Torvalds
parent 24669e5847
commit 189ebff289
3 changed files with 26 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/migrate.h
View File

@ -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; }

15
mm/memory-failure.c
View File

@ -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 */

63
mm/migrate.c
View File

@ -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;
int pass, rc;
for (pass = 0; pass < 10 && retry; pass++) {
retry = 0;
list_for_each_entry_safe(page, page2, from, lru) {
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