linux-kernel - Re: [PATCH mm-unstable v15 09/14] mm: multi-gen LRU: optimize multiple memcgs

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Message-ID: <YzSWfFI+MOeb1ils@google.com>
Date:   Wed, 28 Sep 2022 12:46:20 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Aneesh Kumar <aneesh.kumar@...ux.ibm.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Hillf Danton <hdanton@...a.com>, Jens Axboe <axboe@...nel.dk>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...e.de>,
        Michael Larabel <Michael@...haellarabel.com>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Tejun Heo <tj@...nel.org>, Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
        page-reclaim@...gle.com, Brian Geffon <bgeffon@...gle.com>,
        Jan Alexander Steffens <heftig@...hlinux.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Steven Barrett <steven@...uorix.net>,
        Suleiman Souhlal <suleiman@...gle.com>,
        Daniel Byrne <djbyrne@....edu>,
        Donald Carr <d@...os-reins.com>,
        Holger Hoffstätte 
        <holger@...lied-asynchrony.com>,
        Konstantin Kharlamov <Hi-Angel@...dex.ru>,
        Shuang Zhai <szhai2@...rochester.edu>,
        Sofia Trinh <sofia.trinh@....works>,
        Vaibhav Jain <vaibhav@...ux.ibm.com>
Subject: Re: [PATCH mm-unstable v15 09/14] mm: multi-gen LRU: optimize
 multiple memcgs

Hi Andrew,

Can you please take this fixlet? Thanks.

Fix imprecise comments.

Signed-off-by: Yu Zhao <yuzhao@...gle.com>
---
 mm/vmscan.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a8fd6300fa7e..5b565470286b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -5078,7 +5078,7 @@ static bool should_abort_scan(struct lruvec *lruvec, unsigned long seq,
 	DEFINE_MAX_SEQ(lruvec);
 
 	if (!current_is_kswapd()) {
-		/* age each memcg once to ensure fairness */
+		/* age each memcg at most once to ensure fairness */
 		if (max_seq - seq > 1)
 			return true;
 
@@ -5103,10 +5103,9 @@ static bool should_abort_scan(struct lruvec *lruvec, unsigned long seq,
 
 	/*
 	 * A minimum amount of work was done under global memory pressure. For
-	 * kswapd, it may be overshooting. For direct reclaim, the target isn't
-	 * met, and yet the allocation may still succeed, since kswapd may have
-	 * caught up. In either case, it's better to stop now, and restart if
-	 * necessary.
+	 * kswapd, it may be overshooting. For direct reclaim, the allocation
+	 * may succeed if all suitable zones are somewhat safe. In either case,
+	 * it's better to stop now, and restart later if necessary.
 	 */
 	for (i = 0; i <= sc->reclaim_idx; i++) {
 		unsigned long wmark;
-- 
2.37.3.998.g577e59143f-goog