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From: Yang Shi <shy828301@gmail.com>
To: guro@fb.com, ktkhai@virtuozzo.com, shakeelb@google.com,
	david@fromorbit.com, hannes@cmpxchg.org, mhocko@suse.com,
	akpm@linux-foundation.org
Cc: shy828301@gmail.com, linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/9] mm: vmscan: simplify nr_deferred update code
Date: Wed,  2 Dec 2020 10:27:17 -0800	[thread overview]
Message-ID: <20201202182725.265020-2-shy828301@gmail.com> (raw)
In-Reply-To: <20201202182725.265020-1-shy828301@gmail.com>

Currently if (next_deferred - scanned) = 0, the code would just read the current
nr_deferred otherwise add the delta back.  Both needs atomic operation anyway, it
seems there is not too much gain by distinguishing the two cases, so just add the
delta back even though the delta is 0.  This would simply the code for the following
patches too.

Signed-off-by: Yang Shi <shy828301@gmail.com>
---
 mm/vmscan.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 7b4e31eac2cf..7d6186a07daf 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -528,14 +528,10 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
 		next_deferred = 0;
 	/*
 	 * move the unused scan count back into the shrinker in a
-	 * manner that handles concurrent updates. If we exhausted the
-	 * scan, there is no need to do an update.
+	 * manner that handles concurrent updates.
 	 */
-	if (next_deferred > 0)
-		new_nr = atomic_long_add_return(next_deferred,
-						&shrinker->nr_deferred[nid]);
-	else
-		new_nr = atomic_long_read(&shrinker->nr_deferred[nid]);
+	new_nr = atomic_long_add_return(next_deferred,
+					&shrinker->nr_deferred[nid]);
 
 	trace_mm_shrink_slab_end(shrinker, nid, freed, nr, new_nr, total_scan);
 	return freed;
-- 
2.26.2


  reply	other threads:[~2020-12-02 18:28 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-02 18:27 [RFC PATCH 0/9] Make shrinker's nr_deferred memcg aware Yang Shi
2020-12-02 18:27 ` Yang Shi [this message]
2020-12-03  2:56   ` [PATCH 1/9] mm: vmscan: simplify nr_deferred update code Roman Gushchin
2020-12-02 18:27 ` [PATCH 2/9] mm: vmscan: use nid from shrink_control for tracepoint Yang Shi
2020-12-03  3:13   ` Xiaqing (A)
2020-12-11 19:20     ` Yang Shi
2020-12-11 19:20       ` Yang Shi
2020-12-02 18:27 ` [PATCH 3/9] mm: memcontrol: rename memcg_shrinker_map_mutex to memcg_shrinker_mutex Yang Shi
2020-12-02 18:27 ` [PATCH 4/9] mm: vmscan: use a new flag to indicate shrinker is registered Yang Shi
2020-12-03  3:01   ` Roman Gushchin
2020-12-03  4:59     ` Yang Shi
2020-12-03  4:59       ` Yang Shi
2020-12-03 20:08       ` Roman Gushchin
2020-12-03 22:25         ` Yang Shi
2020-12-03 22:25           ` Yang Shi
2020-12-04 18:52           ` Johannes Weiner
2020-12-04 21:24             ` Yang Shi
2020-12-04 21:24               ` Yang Shi
2020-12-02 18:27 ` [PATCH 5/9] mm: memcontrol: add per memcg shrinker nr_deferred Yang Shi
2020-12-03  3:06   ` Roman Gushchin
2020-12-03  4:54     ` Yang Shi
2020-12-03  4:54       ` Yang Shi
2020-12-03 18:03       ` Yang Shi
2020-12-03 18:03         ` Yang Shi
2020-12-03 20:07         ` Roman Gushchin
2020-12-03 22:49           ` Yang Shi
2020-12-03 22:49             ` Yang Shi
2020-12-03 23:30             ` Roman Gushchin
2020-12-04  0:22               ` Yang Shi
2020-12-04  0:22                 ` Yang Shi
2020-12-10 15:33   ` Johannes Weiner
2020-12-10 19:12     ` Yang Shi
2020-12-10 19:12       ` Yang Shi
2020-12-11 17:52       ` Yang Shi
2020-12-11 17:52         ` Yang Shi
2020-12-10 21:59     ` Yang Shi
2020-12-10 21:59       ` Yang Shi
2020-12-02 18:27 ` [PATCH 6/9] mm: vmscan: use per memcg nr_deferred of shrinker Yang Shi
2020-12-03  3:08   ` Roman Gushchin
2020-12-03  5:01     ` Yang Shi
2020-12-03  5:01       ` Yang Shi
2020-12-03 11:40   ` Kirill Tkhai
2020-12-08 17:13     ` Yang Shi
2020-12-08 17:13       ` Yang Shi
2020-12-09 15:41       ` Kirill Tkhai
2020-12-09 17:32         ` Yang Shi
2020-12-09 17:32           ` Yang Shi
2020-12-10 15:13           ` Johannes Weiner
2020-12-10 15:17             ` Kirill Tkhai
2020-12-15 16:44               ` Johannes Weiner
2020-12-02 18:27 ` [PATCH 7/9] mm: vmscan: don't need allocate shrinker->nr_deferred for memcg aware shrinkers Yang Shi
2020-12-02 18:27 ` [PATCH 8/9] mm: memcontrol: reparent nr_deferred when memcg offline Yang Shi
2020-12-02 18:27 ` [PATCH 9/9] mm: vmscan: shrink deferred objects proportional to priority Yang Shi
2020-12-03  2:52 ` [RFC PATCH 0/9] Make shrinker's nr_deferred memcg aware Roman Gushchin
2020-12-03 17:52   ` Yang Shi
2020-12-03 17:52     ` Yang Shi

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