linux-kernel - [RFC PATCH 1/2] mm: vmscan: remove shrinker's nr

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Message-Id: <20200916185823.5347-2-shy828301@gmail.com>
Date:   Wed, 16 Sep 2020 11:58:22 -0700
From:   Yang Shi <shy828301@...il.com>
To:     linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Cc:     shy828301@...il.com, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 1/2] mm: vmscan: remove shrinker's nr_deferred from tracepoint

The shrinker's nr_deferred will be removed in the following patch, this is a preparation
patch to make it bisectable.

Signed-off-by: Yang Shi <shy828301@...il.com>
---
 include/trace/events/vmscan.h | 26 +++++++-------------------
 mm/vmscan.c                   |  4 ++--
 2 files changed, 9 insertions(+), 21 deletions(-)

diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index 2070df64958e..27f268bbeba4 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -184,18 +184,15 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_softlimit_re
 
 TRACE_EVENT(mm_shrink_slab_start,
 	TP_PROTO(struct shrinker *shr, struct shrink_control *sc,
-		long nr_objects_to_shrink, unsigned long cache_items,
-		unsigned long long delta, unsigned long total_scan,
-		int priority),
+		unsigned long cache_items, unsigned long long delta,
+		unsigned long total_scan, int priority),
 
-	TP_ARGS(shr, sc, nr_objects_to_shrink, cache_items, delta, total_scan,
-		priority),
+	TP_ARGS(shr, sc, cache_items, delta, total_scan, priority),
 
 	TP_STRUCT__entry(
 		__field(struct shrinker *, shr)
 		__field(void *, shrink)
 		__field(int, nid)
-		__field(long, nr_objects_to_shrink)
 		__field(gfp_t, gfp_flags)
 		__field(unsigned long, cache_items)
 		__field(unsigned long long, delta)
@@ -207,7 +204,6 @@ TRACE_EVENT(mm_shrink_slab_start,
 		__entry->shr = shr;
 		__entry->shrink = shr->scan_objects;
 		__entry->nid = sc->nid;
-		__entry->nr_objects_to_shrink = nr_objects_to_shrink;
 		__entry->gfp_flags = sc->gfp_mask;
 		__entry->cache_items = cache_items;
 		__entry->delta = delta;
@@ -215,11 +211,10 @@ TRACE_EVENT(mm_shrink_slab_start,
 		__entry->priority = priority;
 	),
 
-	TP_printk("%pS %p: nid: %d objects to shrink %ld gfp_flags %s cache items %ld delta %lld total_scan %ld priority %d",
+	TP_printk("%pS %p: nid: %d gfp_flags %s cache items %ld delta %lld total_scan %ld priority %d",
 		__entry->shrink,
 		__entry->shr,
 		__entry->nid,
-		__entry->nr_objects_to_shrink,
 		show_gfp_flags(__entry->gfp_flags),
 		__entry->cache_items,
 		__entry->delta,
@@ -229,17 +224,14 @@ TRACE_EVENT(mm_shrink_slab_start,
 
 TRACE_EVENT(mm_shrink_slab_end,
 	TP_PROTO(struct shrinker *shr, int nid, int shrinker_retval,
-		long unused_scan_cnt, long new_scan_cnt, long total_scan),
+		long total_scan),
 
-	TP_ARGS(shr, nid, shrinker_retval, unused_scan_cnt, new_scan_cnt,
-		total_scan),
+	TP_ARGS(shr, nid, shrinker_retval, total_scan),
 
 	TP_STRUCT__entry(
 		__field(struct shrinker *, shr)
 		__field(int, nid)
 		__field(void *, shrink)
-		__field(long, unused_scan)
-		__field(long, new_scan)
 		__field(int, retval)
 		__field(long, total_scan)
 	),
@@ -248,18 +240,14 @@ TRACE_EVENT(mm_shrink_slab_end,
 		__entry->shr = shr;
 		__entry->nid = nid;
 		__entry->shrink = shr->scan_objects;
-		__entry->unused_scan = unused_scan_cnt;
-		__entry->new_scan = new_scan_cnt;
 		__entry->retval = shrinker_retval;
 		__entry->total_scan = total_scan;
 	),
 
-	TP_printk("%pS %p: nid: %d unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d",
+	TP_printk("%pS %p: nid: %d total_scan %ld last shrinker return val %d",
 		__entry->shrink,
 		__entry->shr,
 		__entry->nid,
-		__entry->unused_scan,
-		__entry->new_scan,
 		__entry->total_scan,
 		__entry->retval)
 );
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9727dd8e2581..48ebea97f12f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -485,7 +485,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
 	if (total_scan > freeable * 2)
 		total_scan = freeable * 2;
 
-	trace_mm_shrink_slab_start(shrinker, shrinkctl, nr,
+	trace_mm_shrink_slab_start(shrinker, shrinkctl, 
 				   freeable, delta, total_scan, priority);
 
 	/*
@@ -537,7 +537,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
 	else
 		new_nr = atomic_long_read(&shrinker->nr_deferred[nid]);
 
-	trace_mm_shrink_slab_end(shrinker, nid, freed, nr, new_nr, total_scan);
+	trace_mm_shrink_slab_end(shrinker, nid, freed, total_scan);
 	return freed;
 }
 
-- 
2.26.2