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mm, vmscan: avoid passing in `remaining' unnecessarily to prepare_kswapd_sleep()

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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>
Link: http://lkml.kernel.org/r/1467970510-21195-27-git-send-email-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2016-07-28 15:46:41 -07:00 committed by Linus Torvalds
parent 4f588331bd
commit d9f21d426d
1 changed files with 4 additions and 8 deletions
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12
mm/vmscan.c
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@ -3021,15 +3021,10 @@ 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
@ -3244,7 +3239,7 @@ 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.
@ -3279,7 +3274,8 @@ 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);
/*