From: zbestahu@aliyun.com
To: akpm@linux-foundation.org, minchan@kernel.org, mhocko@suse.com
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Yue Hu <huyue2@coolpad.com>
Subject: [PATCH] mm: vmpressure: simplify pressure ratio calculation
Date: Sat, 1 Jul 2017 14:13:39 +0800 [thread overview]
Message-ID: <1498889619-3933-1-git-send-email-zbestahu@aliyun.com> (raw)
From: Yue Hu <huyue2@coolpad.com>
The patch removes the needless scale in existing caluation, it
makes the calculation more simple and more effective.
Signed-off-by: Yue Hu <huyue2@coolpad.com>
---
mm/vmpressure.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index 6063581..174b2f0 100644
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -111,7 +111,6 @@ static enum vmpressure_levels vmpressure_level(unsigned long pressure)
static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
unsigned long reclaimed)
{
- unsigned long scale = scanned + reclaimed;
unsigned long pressure = 0;
/*
@@ -128,8 +127,7 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
* scanned. This makes it possible to set desired reaction time
* and serves as a ratelimit.
*/
- pressure = scale - (reclaimed * scale / scanned);
- pressure = pressure * 100 / scale;
+ pressure = (scanned - reclaimed) * 100 / scanned;
out:
pr_debug("%s: %3lu (s: %lu r: %lu)\n", __func__, pressure,
--
1.9.1
--
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next reply other threads:[~2017-07-01 6:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-01 6:13 zbestahu [this message]
2017-07-05 10:00 ` [PATCH] mm: vmpressure: simplify pressure ratio calculation Anshuman Khandual
2017-07-05 12:49 ` zbestahu
2017-07-01 6:27 zbestahu
2017-07-03 7:44 ` Michal Hocko
2017-07-03 9:45 zbestahu
2017-07-03 10:23 ` Michal Hocko
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