Commit 96824687 authored by Johannes Weiner's avatar Johannes Weiner Committed by Linus Torvalds

mm: remove use-once cache bias from LRU balancing

When the splitlru patches divided page cache and swap-backed pages into
separate LRU lists, the pressure balance between the lists was biased to
account for the fact that streaming IO can cause memory pressure with a
flood of pages that are used only once.  New page cache additions would
tip the balance toward the file LRU, and repeat access would neutralize
that bias again.  This ensured that page reclaim would always go for
used-once cache first.

Since e9868505 ("mm,vmscan: only evict file pages when we have
plenty"), page reclaim generally skips over swap-backed memory entirely as
long as there is used-once cache present, and will apply the LRU balancing
when only repeatedly accessed cache pages are left - at which point the
previous use-once bias will have been neutralized.  This makes the
use-once cache balancing bias unnecessary.
Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Acked-by: default avatarMinchan Kim <minchan@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Rik van Riel <riel@surriel.com>
Link: http://lkml.kernel.org/r/20200520232525.798933-7-hannes@cmpxchg.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 34e58cac
......@@ -293,7 +293,6 @@ static void __activate_page(struct page *page, struct lruvec *lruvec,
void *arg)
{
if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
int file = page_is_file_lru(page);
int lru = page_lru_base_type(page);
del_page_from_lru_list(page, lruvec, lru);
......@@ -303,7 +302,6 @@ static void __activate_page(struct page *page, struct lruvec *lruvec,
trace_mm_lru_activate(page);
__count_vm_event(PGACTIVATE);
update_page_reclaim_stat(lruvec, file, 1, hpage_nr_pages(page));
}
}
......@@ -975,9 +973,6 @@ static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec,
if (page_evictable(page)) {
lru = page_lru(page);
update_page_reclaim_stat(lruvec, is_file_lru(lru),
PageActive(page),
hpage_nr_pages(page));
if (was_unevictable)
count_vm_event(UNEVICTABLE_PGRESCUED);
} else {
......
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