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From: Mike Kravetz <>
To: Vlastimil Babka <>,
	Andrew Morton <>
	"Kirill A.Shutemov" <>
Subject: Re: [PATCH] mm/hugetlb: remove unnecessary memory fetch in PageHeadHuge()
Date: Wed, 11 Mar 2020 11:20:15 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 3/11/20 10:24 AM, Vlastimil Babka wrote:
> Commit f1e61557f023 ("mm: pack compound_dtor and compound_order into one word
> in struct page") changed compound_dtor from a pointer to an array index in
> order to pack it. To check if page has the hugeltbfs compound_dtor, we can
> just compare the index directly without fetching the function pointer.
> Said commit did that with PageHuge() and we can do the same with PageHeadHuge()
> to make the code a bit smaller and faster.
> Signed-off-by: Vlastimil Babka <>
> Cc: Mike Kravetz <>
> Cc: Kirill A. Shutemov <>


Reviewed-by: Mike Kravetz <>
Mike Kravetz

  reply	other threads:[~2020-03-11 18:20 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-11 17:24 Vlastimil Babka
2020-03-11 18:20 ` Mike Kravetz [this message]
2020-03-11 19:25 ` David Rientjes
2020-03-12  0:41 ` Kirill A. Shutemov
2020-03-12  0:42   ` Kirill A. Shutemov

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