linux-kernel - Re: [RESEND PATCH v7 6/8] mm: Add APIs to free a folio directly to the buddy bypassing pcp

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Message-Id: <20240208124919.a0e1707fefc29c2f4213e509@linux-foundation.org>
Date: Thu, 8 Feb 2024 12:49:19 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Byungchul Park <byungchul@...com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 kernel_team@...ynix.com, ying.huang@...el.com, namit@...are.com,
 vernhao@...cent.com, mgorman@...hsingularity.net, hughd@...gle.com,
 willy@...radead.org, david@...hat.com, peterz@...radead.org,
 luto@...nel.org, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, rjgolo@...il.com
Subject: Re: [RESEND PATCH v7 6/8] mm: Add APIs to free a folio directly to
 the buddy bypassing pcp

On Thu,  8 Feb 2024 15:26:06 +0900 Byungchul Park <byungchul@...com> wrote:

> This is a preparation for migrc mechanism that frees folios at a better

The term "migrc" appears in various places but I don't think we're told
what is actually means?

> time later, rather than the moment migrating folios. The folios freed by
> migrc are too old to keep in pcp.

How do we define "too old" and what causes you to believe this is the case?