linux-kernel - Re: [PATCH 1/8] mm/hugetlb: add pre-zeroed framework

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Message-Id: <20251226094810.16013-1-lizhe.67@bytedance.com>
Date: Fri, 26 Dec 2025 17:48:10 +0800
From: "Li Zhe" <lizhe.67@...edance.com>
To: <raghavendra.kt@....com>
Cc: <akpm@...ux-foundation.org>, <david@...nel.org>, <fvdl@...gle.com>, 
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>, 
	<lizhe.67@...edance.com>, <muchun.song@...ux.dev>, <osalvador@...e.de>
Subject: Re: [PATCH 1/8] mm/hugetlb: add pre-zeroed framework

On Fri, 26 Dec 2025 14:54:17 +0530, raghavendra.kt@....com wrote:

> > +/*
> > + * Once a page has been taken off the freelist, the new page owner
> > + * must wait for the pre-zero thread to finish if it happens
> > + * to be working on this page (which should be rare).
> > + */
> > +static void hpage_wait_zeroing(struct hstate *h, struct folio *folio)
> > +{
> > +	if (!folio_test_hugetlb_zeroing(folio))
> > +		return;
> > +
> > +	spin_lock_irq(&hugetlb_lock);
> > +
> > +	wait_event_cmd(h->dqzero_wait[folio_nid(folio)],
> > +		       !folio_test_hugetlb_zeroing(folio),
> > +		       spin_unlock_irq(&hugetlb_lock),
> > +		       spin_lock_irq(&hugetlb_lock));
> > +
> > +	spin_unlock_irq(&hugetlb_lock);
> > +}
> > +
> 
> nit:
> May be simple enough chunk to introduce guard() above

Thank you for the reminder. I will address this issue in v2.

Thanks,
Zhe