linux-kernel - [PATCH v2 0/2] mm/page_alloc: pcp->batch cleanups

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Message-ID: <20251009192933.3756712-1-joshua.hahnjy@gmail.com>
Date: Thu,  9 Oct 2025 12:29:29 -0700
From: Joshua Hahn <joshua.hahnjy@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Dave Hansen <dave.hansen@...el.com>,
	Brendan Jackman <jackmanb@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Zi Yan <ziy@...dia.com>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	kernel-team@...a.com
Subject: [PATCH v2 0/2] mm/page_alloc: pcp->batch cleanups

Two small cleanups for mm/page_alloc.

Patch 1 cleans up a misleading comment about how pcp->batch is calculated,
and folds in the calculation to increase clarity. No functional change
intended.

Patch 2 corrects zones from reporting that their pcp->batch is 0 when it
is actually 1. Namely, corrects ZONE_DMA from reporting that its batch
size is 0.

Joshua Hahn (2):
  mm/page_alloc: Clarify batch tuning in zone_batchsize
  mm/page_alloc: Prevent reporting pcp->batch = 0

 mm/page_alloc.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)


base-commit: ec714e371f22f716a04e6ecb2a24988c92b26911
-- 
2.47.3