linux-kernel - Re: [PATCH] mm: skip lru_note_cost() when scanning only file or anon

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Message-ID: <20250714152543.GC991@cmpxchg.org>
Date: Mon, 14 Jul 2025 11:25:43 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Hugh Dickins <hughd@...gle.com>
Cc: Roman Gushchin <roman.gushchin@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Michal Hocko <mhocko@...nel.org>,
	David Hildenbrand <david@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: skip lru_note_cost() when scanning only file or anon

On Sun, Jul 13, 2025 at 12:57:18PM -0700, Hugh Dickins wrote:
> [PATCH] mm: lru_note_cost_unlock_irq()
> 
> Dropping a lock, just to demand it again for an afterthought, cannot be
> good if contended: convert lru_note_cost() to lru_note_cost_unlock_irq().
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>