linux-kernel - [PATCH v3] lib/flex_proportions.c: cleanup __fprop_inc_percpu

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Message-Id: <1589254054-48833-1-git-send-email-tan.hu@zte.com.cn>
Date:   Tue, 12 May 2020 11:27:34 +0800
From:   Tan Hu <tan.hu@....com.cn>
To:     akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, jack@...e.cz, xue.zhihong@....com.cn,
        wang.yi59@....com.cn, wang.liang82@....com.cn,
        Tan Hu <tan.hu@....com.cn>
Subject: [PATCH v3] lib/flex_proportions.c: cleanup __fprop_inc_percpu_max

If the given type has fraction smaller than max_frac/FPROP_FRAC_BASE,
the code could be modified to call __fprop_inc_percpu() directly and
easier to understand. After this patch, fprop_reflect_period_percpu()
will be called twice, and quicky return on pl->period == p->period
test, so it would not result to significant downside of performance.

Thanks for Jan's guidance.

Signed-off-by: Tan Hu <tan.hu@....com.cn>
Reviewed-by: Jan Kara <jack@...e.cz>
---
 lib/flex_proportions.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/lib/flex_proportions.c b/lib/flex_proportions.c
index 7852bfff5..451543937 100644
--- a/lib/flex_proportions.c
+++ b/lib/flex_proportions.c
@@ -266,8 +266,7 @@ void __fprop_inc_percpu_max(struct fprop_global *p,
 		if (numerator >
 		    (((u64)denominator) * max_frac) >> FPROP_FRAC_SHIFT)
 			return;
-	} else
-		fprop_reflect_period_percpu(p, pl);
-	percpu_counter_add_batch(&pl->events, 1, PROP_BATCH);
-	percpu_counter_add(&p->events, 1);
+	}
+
+	__fprop_inc_percpu(p, pl);
 }
-- 
2.19.1