linux-kernel - [PATCH mm-unstable] mm/demotion: Make toptier_distance inclusive upper bound of toptiers

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Date:   Tue, 30 Aug 2022 13:44:57 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     linux-mm@...ck.org, akpm@...ux-foundation.org
Cc:     Wei Xu <weixugc@...gle.com>, Huang Ying <ying.huang@...el.com>,
        Yang Shi <shy828301@...il.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Tim C Chen <tim.c.chen@...el.com>,
        Michal Hocko <mhocko@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hesham Almatary <hesham.almatary@...wei.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alistair Popple <apopple@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Johannes Weiner <hannes@...xchg.org>, jvgediya.oss@...il.com,
        Bharata B Rao <bharata@....com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Subject: [PATCH mm-unstable] mm/demotion: Make toptier_distance inclusive upper bound of toptiers

Based on suggestion from Wei Xu <weixugc@...gle.com>, having an
inclusive upper bound is found simpler.

Fixes: mm/demotion: Update node_is_toptier to work with memory tiers
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
---
 mm/memory-tiers.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c
index c4bd6d052a33..c82eb0111383 100644
--- a/mm/memory-tiers.c
+++ b/mm/memory-tiers.c
@@ -179,7 +179,7 @@ bool node_is_toptier(int node)
 		toptier = true;
 		goto out;
 	}
-	if (memtier->adistance_start < top_tier_adistance)
+	if (memtier->adistance_start <= top_tier_adistance)
 		toptier = true;
 	else
 		toptier = false;
@@ -361,7 +361,8 @@ static void establish_demotion_targets(void)
 			 * abstract distance below the max value of this memtier
 			 * is considered toptier.
 			 */
-			top_tier_adistance = memtier->adistance_start + MEMTIER_CHUNK_SIZE;
+			top_tier_adistance = memtier->adistance_start +
+						MEMTIER_CHUNK_SIZE - 1;
 			break;
 		}
 	}
-- 
2.37.2