From: Minchan Kim <minchan@google.com>
Date: Wed, 27 Jun 2018 13:04:07 +0000 (+0900)
Subject: mm: mm_event: add reclaim stat
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=abd25eeff2afe4447c60848402e4abd5a14b232d;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

mm: mm_event: add reclaim stat

This patch adds page reclaim mm_event stat so that we could
keep tracking [avg|max]_latency for the handling the event
as well as count of the event.

Direct reclaim latency is usually a most popular latency source
caused by memory pressure so we need to track it down to hunt
down application's jank problem.

Mot-CRs-fixed: (CR)

Bug: 80168800
Change-Id: I215c3972f76389404da7c4806a776bf753daac01
Signed-off-by: Minchan Kim <minchan@google.com>
Reviewed-on: https://gerrit.mot.com/1453721
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>
Submit-Approved: Jira Key
---

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 97857b94d218..0b92919df47f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3056,6 +3056,7 @@ out:
 unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 				gfp_t gfp_mask, nodemask_t *nodemask)
 {
+	ktime_t event_ts;
 	unsigned long nr_reclaimed;
 	struct scan_control sc = {
 		.nr_to_reclaim = SWAP_CLUSTER_MAX,
@@ -3077,6 +3078,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 	if (throttle_direct_reclaim(sc.gfp_mask, zonelist, nodemask))
 		return 1;
 
+	mm_event_start(&event_ts);
 	trace_mm_vmscan_direct_reclaim_begin(order,
 				sc.may_writepage,
 				sc.gfp_mask,
@@ -3085,6 +3087,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 	nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
 
 	trace_mm_vmscan_direct_reclaim_end(nr_reclaimed);
+	mm_event_end(MM_RECLAIM, event_ts);
 
 	return nr_reclaimed;
 }
@@ -3596,6 +3599,7 @@ static int kswapd(void *p)
 	for ( ; ; ) {
 		bool ret;
 
+		ktime_t event_ts;
 		alloc_order = reclaim_order = pgdat->kswapd_order;
 		classzone_idx = kswapd_classzone_idx(pgdat, classzone_idx);
 
@@ -3631,7 +3635,9 @@ kswapd_try_sleep:
 		trace_mm_vmscan_kswapd_wake(pgdat->node_id, classzone_idx,
 						alloc_order);
 		fs_reclaim_acquire(GFP_KERNEL);
+		mm_event_start(&event_ts);
 		reclaim_order = balance_pgdat(pgdat, alloc_order, classzone_idx);
+		mm_event_end(MM_RECLAIM, event_ts);
 		fs_reclaim_release(GFP_KERNEL);
 		if (reclaim_order < alloc_order)
 			goto kswapd_try_sleep;