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authorShaohua Li <shli@fb.com>2017-05-03 14:52:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 15:52:08 -0700
commit802a3a92ad7ac0b9be9df229dee530a1f0a8039b (patch)
tree31e84759f836bdb9a5e464316df3ea7f4c8891f5 /mm/vmscan.c
parentf7ad2a6cb9f7c4040004bedee84a70a9b985583e (diff)
downloadlwn-802a3a92ad7ac0b9be9df229dee530a1f0a8039b.tar.gz
lwn-802a3a92ad7ac0b9be9df229dee530a1f0a8039b.zip
mm: reclaim MADV_FREE pages
When memory pressure is high, we free MADV_FREE pages. If the pages are not dirty in pte, the pages could be freed immediately. Otherwise we can't reclaim them. We put the pages back to anonumous LRU list (by setting SwapBacked flag) and the pages will be reclaimed in normal swapout way. We use normal page reclaim policy. Since MADV_FREE pages are put into inactive file list, such pages and inactive file pages are reclaimed according to their age. This is expected, because we don't want to reclaim too many MADV_FREE pages before used once pages. Based on Minchan's original patch [minchan@kernel.org: clean up lazyfree page handling] Link: http://lkml.kernel.org/r/20170303025237.GB3503@bbox Link: http://lkml.kernel.org/r/14b8eb1d3f6bf6cc492833f183ac8c304e560484.1487965799.git.shli@fb.com Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Minchan Kim <minchan@kernel.org> Acked-by: Minchan Kim <minchan@kernel.org> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Hugh Dickins <hughd@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c34
1 files changed, 22 insertions, 12 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index e5c00f2b98ab..ec4555369e17 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -906,7 +906,8 @@ static void page_check_dirty_writeback(struct page *page,
* Anonymous pages are not handled by flushers and must be written
* from reclaim context. Do not stall reclaim based on them
*/
- if (!page_is_file_cache(page)) {
+ if (!page_is_file_cache(page) ||
+ (PageAnon(page) && !PageSwapBacked(page))) {
*dirty = false;
*writeback = false;
return;
@@ -987,7 +988,8 @@ static unsigned long shrink_page_list(struct list_head *page_list,
goto keep_locked;
/* Double the slab pressure for mapped and swapcache pages */
- if (page_mapped(page) || PageSwapCache(page))
+ if ((page_mapped(page) || PageSwapCache(page)) &&
+ !(PageAnon(page) && !PageSwapBacked(page)))
sc->nr_scanned++;
may_enter_fs = (sc->gfp_mask & __GFP_FS) ||
@@ -1113,8 +1115,10 @@ static unsigned long shrink_page_list(struct list_head *page_list,
/*
* Anonymous process memory has backing store?
* Try to allocate it some swap space here.
+ * Lazyfree page could be freed directly
*/
- if (PageAnon(page) && !PageSwapCache(page)) {
+ if (PageAnon(page) && PageSwapBacked(page) &&
+ !PageSwapCache(page)) {
if (!(sc->gfp_mask & __GFP_IO))
goto keep_locked;
if (!add_to_swap(page, page_list))
@@ -1135,9 +1139,12 @@ static unsigned long shrink_page_list(struct list_head *page_list,
* The page is mapped into the page tables of one or more
* processes. Try to unmap it here.
*/
- if (page_mapped(page) && mapping) {
+ if (page_mapped(page)) {
switch (ret = try_to_unmap(page,
ttu_flags | TTU_BATCH_FLUSH)) {
+ case SWAP_DIRTY:
+ SetPageSwapBacked(page);
+ /* fall through */
case SWAP_FAIL:
nr_unmap_fail++;
goto activate_locked;
@@ -1145,8 +1152,6 @@ static unsigned long shrink_page_list(struct list_head *page_list,
goto keep_locked;
case SWAP_MLOCK:
goto cull_mlocked;
- case SWAP_LZFREE:
- goto lazyfree;
case SWAP_SUCCESS:
; /* try to free the page below */
}
@@ -1258,10 +1263,18 @@ static unsigned long shrink_page_list(struct list_head *page_list,
}
}
-lazyfree:
- if (!mapping || !__remove_mapping(mapping, page, true))
- goto keep_locked;
+ if (PageAnon(page) && !PageSwapBacked(page)) {
+ /* follow __remove_mapping for reference */
+ if (!page_ref_freeze(page, 1))
+ goto keep_locked;
+ if (PageDirty(page)) {
+ page_ref_unfreeze(page, 1);
+ goto keep_locked;
+ }
+ count_vm_event(PGLAZYFREED);
+ } else if (!mapping || !__remove_mapping(mapping, page, true))
+ goto keep_locked;
/*
* At this point, we have no other references and there is
* no way to pick any more up (removed from LRU, removed
@@ -1271,9 +1284,6 @@ lazyfree:
*/
__ClearPageLocked(page);
free_it:
- if (ret == SWAP_LZFREE)
- count_vm_event(PGLAZYFREED);
-
nr_reclaimed++;
/*