linux-kernel - [PATCH] mm, page_alloc: reset the zone->watermark

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Message-Id: <1589204408-5152-1-git-send-email-charante@codeaurora.org>
Date:   Mon, 11 May 2020 19:10:08 +0530
From:   Charan Teja Reddy <charante@...eaurora.org>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, vinmenon@...eaurora.org,
        Charan Teja Reddy <charante@...eaurora.org>
Subject: [PATCH] mm, page_alloc: reset the zone->watermark_boost early

Updating the zone watermarks by any means, like extra_free_kbytes,
min_free_kbytes, water_mark_scale_factor e.t.c, when watermark_boost is
set will result into the higher low and high watermarks than the user
asks. This can be avoided by resetting the zone->watermark_boost to zero
early.

Signed-off-by: Charan Teja Reddy <charante@...eaurora.org>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 1b265b09..822e262 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7746,9 +7746,9 @@ static void __setup_per_zone_wmarks(void)
 			    mult_frac(zone_managed_pages(zone),
 				      watermark_scale_factor, 10000));
 
+		zone->watermark_boost = 0;
 		zone->_watermark[WMARK_LOW]  = min_wmark_pages(zone) + tmp;
 		zone->_watermark[WMARK_HIGH] = min_wmark_pages(zone) + tmp * 2;
-		zone->watermark_boost = 0;
 
 		spin_unlock_irqrestore(&zone->lock, flags);
 	}
-- 
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