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Revert "FROMLIST: mm: multi-gen LRU: optimize multiple memcgs"

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This reverts commit 082bc8296a.

To be replaced with upstream version.

Bug: 249601646
Change-Id: I549fb8b85659b3e7b1d457c5214a7edb99df5ac5
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
This commit is contained in:
Kalesh Singh
2022-11-08 09:09:21 -08:00
parent 56c66e7cc4
commit 6fa2a68b43
1 changed files with 4 additions and 41 deletions
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45
mm/vmscan.c
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@@ -134,13 +134,6 @@ struct scan_control {
/* The file pages on the current node are dangerously low */ /* The file pages on the current node are dangerously low */
unsigned int file_is_tiny:1; unsigned int file_is_tiny:1;
#ifdef CONFIG_LRU_GEN
/* help make better choices when multiple memcgs are available */
unsigned int memcgs_need_aging:1;
unsigned int memcgs_need_swapping:1;
unsigned int memcgs_avoid_swapping:1;
#endif
/* Allocation order */ /* Allocation order */
s8 order; s8 order;
@@ -3965,22 +3958,6 @@ static void lru_gen_age_node(struct pglist_data *pgdat, struct scan_control *sc)
VM_BUG_ON(!current_is_kswapd()); VM_BUG_ON(!current_is_kswapd());
/*
* To reduce the chance of going into the aging path or swapping, which
* can be costly, optimistically skip them unless their corresponding
* flags were cleared in the eviction path. This improves the overall
* performance when multiple memcgs are available.
*/
if (!sc->memcgs_need_aging) {
sc->memcgs_need_aging = true;
sc->memcgs_avoid_swapping = !sc->memcgs_need_swapping;
sc->memcgs_need_swapping = true;
return;
}
sc->memcgs_need_swapping = true;
sc->memcgs_avoid_swapping = true;
current->reclaim_state->mm_walk = &pgdat->mm_walk; current->reclaim_state->mm_walk = &pgdat->mm_walk;
memcg = mem_cgroup_iter(NULL, NULL, NULL); memcg = mem_cgroup_iter(NULL, NULL, NULL);
@@ -4382,8 +4359,7 @@ static int isolate_pages(struct lruvec *lruvec, struct scan_control *sc, int swa
return scanned; return scanned;
} }
static int evict_pages(struct lruvec *lruvec, struct scan_control *sc, int swappiness, static int evict_pages(struct lruvec *lruvec, struct scan_control *sc, int swappiness)
bool *swapped)
{ {
int type; int type;
int scanned; int scanned;
@@ -4448,9 +4424,6 @@ static int evict_pages(struct lruvec *lruvec, struct scan_control *sc, int swapp
sc->nr_reclaimed += reclaimed; sc->nr_reclaimed += reclaimed;
if (type == LRU_GEN_ANON && swapped)
*swapped = true;
return scanned; return scanned;
} }
@@ -4479,10 +4452,8 @@ static long get_nr_to_scan(struct lruvec *lruvec, struct scan_control *sc, bool
if (!nr_to_scan) if (!nr_to_scan)
return 0; return 0;
if (!need_aging) { if (!need_aging)
sc->memcgs_need_aging = false;
return nr_to_scan; return nr_to_scan;
}
/* leave the work to lru_gen_age_node() */ /* leave the work to lru_gen_age_node() */
if (current_is_kswapd()) if (current_is_kswapd())
@@ -4504,8 +4475,6 @@ static void lru_gen_shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc
{ {
struct blk_plug plug; struct blk_plug plug;
long scanned = 0; long scanned = 0;
bool swapped = false;
unsigned long reclaimed = sc->nr_reclaimed;
struct pglist_data *pgdat = lruvec_pgdat(lruvec); struct pglist_data *pgdat = lruvec_pgdat(lruvec);
lru_add_drain(); lru_add_drain();
@@ -4531,19 +4500,13 @@ static void lru_gen_shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc
if (!nr_to_scan) if (!nr_to_scan)
break; break;
delta = evict_pages(lruvec, sc, swappiness, &swapped); delta = evict_pages(lruvec, sc, swappiness);
if (!delta) if (!delta)
break; break;
if (sc->memcgs_avoid_swapping && swappiness < 200 && swapped)
break;
scanned += delta; scanned += delta;
if (scanned >= nr_to_scan) { if (scanned >= nr_to_scan)
if (!swapped && sc->nr_reclaimed - reclaimed >= MIN_LRU_BATCH)
sc->memcgs_need_swapping = false;
break; break;
}
cond_resched(); cond_resched();
} }