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mm: remove SWAP_MLOCK in ttu

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ttu doesn't need to return SWAP_MLOCK.  Instead, just return SWAP_FAIL
because it means the page is not-swappable so it should move to another
LRU list(active or unevictable).  putback friends will move it to right
list depending on the page's LRU flag.

Link: http://lkml.kernel.org/r/1489555493-14659-6-git-send-email-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim 2017-05-03 14:54:13 -07:00 committed by Linus Torvalds
parent 192d723256
commit ad6b67041a
3 changed files with 8 additions and 16 deletions
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1
include/linux/rmap.h
View File

@ -297,6 +297,5 @@ static inline int page_mkclean(struct page *page)
#define SWAP_SUCCESS 0
#define SWAP_AGAIN 1
#define SWAP_FAIL 2
#define SWAP_MLOCK 3
#endif /* _LINUX_RMAP_H */

3
mm/rmap.c
View File

@ -1329,7 +1329,7 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
*/
mlock_vma_page(page);
}
ret = SWAP_MLOCK;
ret = SWAP_FAIL;
page_vma_mapped_walk_done(&pvmw);
break;
}
@ -1506,7 +1506,6 @@ static int page_mapcount_is_zero(struct page *page)
* SWAP_SUCCESS - we succeeded in removing all mappings
* SWAP_AGAIN - we missed a mapping, try again later
* SWAP_FAIL - the page is unswappable
* SWAP_MLOCK - page is mlocked.
*/
int try_to_unmap(struct page *page, enum ttu_flags flags)
{

20
mm/vmscan.c
View File

@ -987,7 +987,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
sc->nr_scanned++;
if (unlikely(!page_evictable(page)))
goto cull_mlocked;
goto activate_locked;
if (!sc->may_unmap && page_mapped(page))
goto keep_locked;
@ -1152,8 +1152,6 @@ static unsigned long shrink_page_list(struct list_head *page_list,
goto activate_locked;
case SWAP_AGAIN:
goto keep_locked;
case SWAP_MLOCK:
goto cull_mlocked;
case SWAP_SUCCESS:
; /* try to free the page below */
}
@ -1295,20 +1293,16 @@ static unsigned long shrink_page_list(struct list_head *page_list,
list_add(&page->lru, &free_pages);
continue;
cull_mlocked:
if (PageSwapCache(page))
try_to_free_swap(page);
unlock_page(page);
list_add(&page->lru, &ret_pages);
continue;
activate_locked:
/* Not a candidate for swapping, so reclaim swap space. */
if (PageSwapCache(page) && mem_cgroup_swap_full(page))
if (PageSwapCache(page) && (mem_cgroup_swap_full(page) ||
PageMlocked(page)))
try_to_free_swap(page);
VM_BUG_ON_PAGE(PageActive(page), page);
SetPageActive(page);
pgactivate++;
if (!PageMlocked(page)) {
SetPageActive(page);
pgactivate++;
}
keep_locked:
unlock_page(page);
keep: