MGLRU has a LRU list for each zone for each type (anon/file) in each
generation:
long nr_pages[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES];
The min_seq (oldest generation) can progress independently for each
type but the max_seq (youngest generation) is shared for both anon and
file. This is to maintain a common frame of reference.
In order for eviction to advance the min_seq of a type, all the per-zone
lists in the oldest generation of that type must be empty.
The eviction logic only considers pages from eligible zones for
eviction or promotion.
scan_folios() {
...
for (zone = sc->reclaim_idx; zone >= 0; zone--) {
...
sort_folio(); // Promote
...
isolate_folio(); // Evict
}
...
}
Consider the system has the movable zone configured and default 4
generations. The current state of the system is as shown below
(only illustrating one type for simplicity):
Type: ANON
Zone DMA32 Normal Movable Device
Gen 0 0 0 4GB 0
Gen 1 0 1GB 1MB 0
Gen 2 1MB 4GB 1MB 0
Gen 3 1MB 1MB 1MB 0
Now consider there is a GFP_KERNEL allocation request (eligible zone
index <= Normal), evict_folios() will return without doing any work
since there are no pages to scan in the eligible zones of the oldest
generation. Reclaim won't make progress until triggered from a ZONE_MOVABLE
allocation request; which may not happen soon if there is a lot of free
memory in the movable zone. This can lead to OOM kills, although there
is 1GB pages in the Normal zone of Gen 1 that we have not yet tried to
reclaim.
This issue is not seen in the conventional active/inactive LRU since
there are no per-zone lists.
If there are no (not enough) folios to scan in the eligible zones, move
folios from ineligible zone (zone_index > reclaim_index) to the next
generation. This allows for the progression of min_seq and reclaiming
from the next generation (Gen 1).
Qualcomm, Mediatek and raspberrypi [1] discovered this issue independently.
[1] https://github.com/raspberrypi/linux/issues/5395
Link: https://lkml.kernel.org/r/20230802025606.346758-1-kaleshsingh@xxxxxxxxxx
Fixes: ac35a4902374 ("mm: multi-gen LRU: minimal implementation")
Signed-off-by: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
Reported-by: Charan Teja Kalla <quic_charante@xxxxxxxxxxx>
Reported-by: Lecopzer Chen <lecopzer.chen@xxxxxxxxxxxx>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> [mediatek]
Tested-by: Charan Teja Kalla <quic_charante@xxxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Barry Song <baohua@xxxxxxxxxx>
Cc: Brian Geffon <bgeffon@xxxxxxxxxx>
Cc: Jan Alexander Steffens (heftig) <heftig@xxxxxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx>
Cc: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Cc: Steven Barrett <steven@xxxxxxxxxxxx>
Cc: Suleiman Souhlal <suleiman@xxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Aneesh Kumar K V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
(cherry picked from commit 669281ee7ef731fb5204df9d948669bf32a5e68d)
[ Kalesh Singh - Fix conflicts caused by rename of lrugen->lists to
lrugen->folios ]
Signed-off-by: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
---
mm/vmscan.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index d18296109aa7..d7016fdb7c14 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -4728,7 +4728,8 @@ void lru_gen_look_around(struct page_vma_mapped_walk *pvmw)
* the eviction
******************************************************************************/
-static bool sort_folio(struct lruvec *lruvec, struct folio *folio, int tier_idx)
+static bool sort_folio(struct lruvec *lruvec, struct folio *folio, struct scan_control *sc,
+ int tier_idx)
{
bool success;
int gen = folio_lru_gen(folio);
@@ -4779,6 +4780,13 @@ static bool sort_folio(struct lruvec *lruvec, struct folio *folio, int tier_idx)
return true;
}
+ /* ineligible */
+ if (zone > sc->reclaim_idx) {
+ gen = folio_inc_gen(lruvec, folio, false);
+ list_move_tail(&folio->lru, &lrugen->lists[gen][type][zone]);
+ return true;
+ }
+
/* waiting for writeback */
if (folio_test_locked(folio) || folio_test_writeback(folio) ||
(type == LRU_GEN_FILE && folio_test_dirty(folio))) {
@@ -4831,7 +4839,8 @@ static bool isolate_folio(struct lruvec *lruvec, struct folio *folio, struct sca
static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
int type, int tier, struct list_head *list)
{
- int gen, zone;
+ int i;
+ int gen;
enum vm_event_item item;
int sorted = 0;
int scanned = 0;
@@ -4847,9 +4856,10 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
gen = lru_gen_from_seq(lrugen->min_seq[type]);
- for (zone = sc->reclaim_idx; zone >= 0; zone--) {
+ for (i = MAX_NR_ZONES; i > 0; i--) {
LIST_HEAD(moved);
int skipped = 0;
+ int zone = (sc->reclaim_idx + i) % MAX_NR_ZONES;
struct list_head *head = &lrugen->lists[gen][type][zone];
while (!list_empty(head)) {
@@ -4863,7 +4873,7 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
scanned += delta;
- if (sort_folio(lruvec, folio, tier))
+ if (sort_folio(lruvec, folio, sc, tier))
sorted += delta;
else if (isolate_folio(lruvec, folio, sc)) {
list_add(&folio->lru, list);
--
2.42.0.283.g2d96d420d3-goog
