linux-kernel - [PATCH 2/3] mm, page_alloc: Disable watermark boosting if THP is disabled at boot

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Date:   Tue, 25 Feb 2020 14:15:33 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...e.com>, Vlastimil Babka <vbabka@...e.cz>,
        Ivan Babrou <ivan@...udflare.com>,
        Rik van Riel <riel@...riel.com>,
        Linux-MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 2/3] mm, page_alloc: Disable watermark boosting if THP is disabled at boot

Watermark boosting is intended to increase the success rate and reduce
latency of high-order allocations, particularly THP. If THP is disabled
at boot, then it makes sense to disable watermark boosting as well. While
there are other high-order allocations that potentially benefit, they
are relatively rare.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 mm/huge_memory.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index b08b199f9a11..565bb9973ff8 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -472,6 +472,7 @@ static int __init setup_transparent_hugepage(char *str)
 			  &transparent_hugepage_flags);
 		clear_bit(TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
 			  &transparent_hugepage_flags);
+		disable_watermark_boosting();
 		ret = 1;
 	}
 out:
-- 
2.16.4