linux-kernel - Re: [PATCH] mempolicy: Clarify what RECLAIM

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Message-Id: <20250731184533.16419-1-sj@kernel.org>
Date: Thu, 31 Jul 2025 11:45:33 -0700
From: SeongJae Park <sj@...nel.org>
To: "Huang, Ying" <ying.huang@...ux.alibaba.com>
Cc: SeongJae Park <sj@...nel.org>,
	Joshua Hahn <joshua.hahnjy@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Zi Yan <ziy@...dia.com>,
	Matthew Brost <matthew.brost@...el.com>,
	Rakie Kim <rakie.kim@...com>,
	Byungchul Park <byungchul@...com>,
	Gregory Price <gourry@...rry.net>,
	Alistair Popple <apopple@...dia.com>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	kernel-team@...a.com,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH] mempolicy: Clarify what RECLAIM_ZONE means

On Thu, 31 Jul 2025 09:48:54 +0800 "Huang, Ying" <ying.huang@...ux.alibaba.com> wrote:

> Joshua Hahn <joshua.hahnjy@...il.com> writes:
[...]
> > On that note, one thing that I felt was slightly undercaptured in
> > Documentation/admin-guide is what "zone reclaim" actually means. What it does
> > is of course well captured by its name, but it misses the nuance of preferring
> > reclaim over fallback allocation.
> >
> > Actually the whole motivation behind all of this conversation is because I saw
> > zone reclaim preventing allocation into a second node in a 2-NUMA node system
> > and was a bit confused until I understood what the implication of having
> > zone reclaim was.
> 
> Yes.  It's good to improve the document.  If it makes you confusing, it
> may make others confusing too.

+1


Thanks,
SJ

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