[PATCH 26/34] mm, vmscan: avoid passing in remaining unnecessarily to prepare_kswapd_sleep
From: Mel Gorman <hidden>
Date: 2016-07-08 09:39:56
Also in:
lkml
Subsystem:
memory management, memory management - mglru (multi-gen lru), memory management - reclaim, the rest · Maintainers:
Andrew Morton, Johannes Weiner, Linus Torvalds
As pointed out by Minchan Kim, the first call to prepare_kswapd_sleep always passes in 0 for remaining and the second call can trivially check the parameter in advance. Suggested-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Mel Gorman <redacted> --- mm/vmscan.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6d5c78e2312b..8a67aa53aa7b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c@@ -3020,15 +3020,10 @@ static bool zone_balanced(struct zone *zone, int order, int classzone_idx) * * Returns true if kswapd is ready to sleep */ -static bool prepare_kswapd_sleep(pg_data_t *pgdat, int order, long remaining, - int classzone_idx) +static bool prepare_kswapd_sleep(pg_data_t *pgdat, int order, int classzone_idx) { int i; - /* If a direct reclaimer woke kswapd within HZ/10, it's premature */ - if (remaining) - return false; - /* * The throttled processes are normally woken up in balance_pgdat() as * soon as pfmemalloc_watermark_ok() is true. But there is a potential
@@ -3243,7 +3238,7 @@ static void kswapd_try_to_sleep(pg_data_t *pgdat, int alloc_order, int reclaim_o prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERRUPTIBLE); /* Try to sleep for a short interval */ - if (prepare_kswapd_sleep(pgdat, reclaim_order, remaining, classzone_idx)) { + if (prepare_kswapd_sleep(pgdat, reclaim_order, classzone_idx)) { /* * Compaction records what page blocks it recently failed to * isolate pages from and skips them in the future scanning.
@@ -3278,7 +3273,8 @@ static void kswapd_try_to_sleep(pg_data_t *pgdat, int alloc_order, int reclaim_o * After a short sleep, check if it was a premature sleep. If not, then * go fully to sleep until explicitly woken up. */ - if (prepare_kswapd_sleep(pgdat, reclaim_order, remaining, classzone_idx)) { + if (!remaining && + prepare_kswapd_sleep(pgdat, reclaim_order, classzone_idx)) { trace_mm_vmscan_kswapd_sleep(pgdat->node_id); /*
--
2.6.4
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