From: mateusznosek0@gmail.com
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Mateusz Nosek <mateusznosek0@gmail.com>, akpm@linux-foundation.org
Subject: [PATCH] mm/compaction.c: micro-optimization remove unnecessary branch
Date: Sun, 13 Sep 2020 21:04:48 +0200 [thread overview]
Message-ID: <20200913190448.28649-1-mateusznosek0@gmail.com> (raw)
From: Mateusz Nosek <mateusznosek0@gmail.com>
The same code can work both for 'zone->compact_considered > defer_limit'
and 'zone->compact_considered >= defer_limit'. In the latter there is one
branch less which is more effective considering performance.
Signed-off-by: Mateusz Nosek <mateusznosek0@gmail.com>
---
mm/compaction.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index 176dcded298e..6c63844fc061 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -180,11 +180,10 @@ bool compaction_deferred(struct zone *zone, int order)
return false;
/* Avoid possible overflow */
- if (++zone->compact_considered > defer_limit)
+ if (++zone->compact_considered >= defer_limit) {
zone->compact_considered = defer_limit;
-
- if (zone->compact_considered >= defer_limit)
return false;
+ }
trace_mm_compaction_deferred(zone, order);
--
2.20.1
reply other threads:[~2020-09-13 19:05 UTC|newest]
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