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mm/vmscan: simplify shrink_node() 

The difference between sc->nr_reclaimed and nr_reclaimed is computed three
times.  Introduce a new variable to record the value, so it only needs to
be computed once.

Link: https://lkml.kernel.org/r/20230411061757.12041-1-haifeng.xu@shopee.com
Signed-off-by: Haifeng Xu <haifeng.xu@shopee.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Haifeng Xu 2023-04-11 06:17:57 +00:00 committed by Andrew Morton
parent 09a607c9cd
commit 54c4fe08f6
1 changed files with 6 additions and 6 deletions
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12
mm/vmscan.c
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@ -6463,7 +6463,7 @@ static void shrink_node_memcgs(pg_data_t *pgdat, struct scan_control *sc)
static void shrink_node(pg_data_t *pgdat, struct scan_control *sc)
{
struct reclaim_state *reclaim_state = current->reclaim_state;
unsigned long nr_reclaimed, nr_scanned;
unsigned long nr_reclaimed, nr_scanned, nr_node_reclaimed;
struct lruvec *target_lruvec;
bool reclaimable = false;
@ -6489,13 +6489,14 @@ again:
reclaim_state->reclaimed_slab = 0;
}
nr_node_reclaimed = sc->nr_reclaimed - nr_reclaimed;
/* Record the subtree's reclaim efficiency */
if (!sc->proactive)
vmpressure(sc->gfp_mask, sc->target_mem_cgroup, true,
sc->nr_scanned - nr_scanned,
sc->nr_reclaimed - nr_reclaimed);
sc->nr_scanned - nr_scanned, nr_node_reclaimed);
if (sc->nr_reclaimed - nr_reclaimed)
if (nr_node_reclaimed)
reclaimable = true;
if (current_is_kswapd()) {
@ -6557,8 +6558,7 @@ again:
test_bit(LRUVEC_CONGESTED, &target_lruvec->flags))
reclaim_throttle(pgdat, VMSCAN_THROTTLE_CONGESTED);
if (should_continue_reclaim(pgdat, sc->nr_reclaimed - nr_reclaimed,
sc))
if (should_continue_reclaim(pgdat, nr_node_reclaimed, sc))
goto again;
/*