linux-kernel - Re: [PATCH 6/6] mm: Drain LRUs upon resume to userspace on nohz

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Message-ID: <aGaTh2esRWr3L6IC@casper.infradead.org>
Date: Thu, 3 Jul 2025 15:28:23 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Frederic Weisbecker <frederic@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Michal Hocko <mhocko@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org
Subject: Re: [PATCH 6/6] mm: Drain LRUs upon resume to userspace on nohz_full
 CPUs

On Thu, Jul 03, 2025 at 04:07:17PM +0200, Frederic Weisbecker wrote:
> +unsigned int folio_batch_add(struct folio_batch *fbatch,
> +			     struct folio *folio)
> +{
> +	unsigned int ret;
> +
> +	fbatch->folios[fbatch->nr++] = folio;
> +	ret = folio_batch_space(fbatch);
> +	isolated_task_work_queue();

Umm.  LRUs use folio_batches, but they are definitely not the only user
of folio_batches.  Maybe you want to add a new lru_batch_add()
abstraction, because this call is definitely being done at the wrong
level.