diff mbox series

[V4,3/3] mm: compaction: fix wakeup logic of proactive compaction

Message ID 89e90b9c13566e7c28d70e5d6aa048ee3ec41757.1624028025.git.charante@codeaurora.org (mailing list archive)
State New
Headers show
Series mm: compaction: proactive compaction trigger by user | expand

Commit Message

Charan Teja Reddy June 18, 2021, 3:18 p.m. UTC
Currently, proactive compaction tries to get triggered for every
HPAGE_FRAG_CHECK_INTERVAL_MSEC(=500msec) even when proactive compaction
is disabled with sysctl.compaction_proactiveness = 0. This results in
kcompactd thread wakes up and goes to sleep for every 500msec with out
the need of doing proactive compaction. Though this doesn't have any
overhead, few cpu cycles can be saved by avoid of waking up kcompactd
thread for proactive compaction when it is disabled.

Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
---
 -- Changes in V4:
       o No functional changes from V3.
 -- Changes in V3:
       o Fix wake up logic in proactive compaction.
 -- Changes in V2 through V2 doesn't exist.

 mm/compaction.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/mm/compaction.c b/mm/compaction.c
index 7672be3..44a232a 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2928,6 +2928,8 @@  static int kcompactd(void *p)
 	while (!kthread_should_stop()) {
 		unsigned long pflags;
 
+		if (!sysctl_compaction_proactiveness)
+			timeout = MAX_SCHEDULE_TIMEOUT;
 		trace_mm_compaction_kcompactd_sleep(pgdat->node_id);
 		if (wait_event_freezable_timeout(pgdat->kcompactd_wait,
 			kcompactd_work_requested(pgdat), timeout) &&