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Message-ID: <0e8b6a2f-527d-7c77-efcf-04f21ef2a77c@intel.com>
Date: Mon, 4 Jan 2021 11:19:13 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
Mel Gorman <mgorman@...hsingularity.net>,
Andrew Morton <akpm@...ux-foundation.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Dan Williams <dan.j.williams@...el.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
David Hildenbrand <david@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Michal Hocko <mhocko@...e.com>,
Liang Li <liliangleo@...iglobal.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
virtualization@...ts.linux-foundation.org
Subject: Re: [RFC v2 PATCH 4/4] mm: pre zero out free pages to speed up page
allocation for __GFP_ZERO
On 12/21/20 8:30 AM, Liang Li wrote:
> --- a/include/linux/page-flags.h
> +++ b/include/linux/page-flags.h
> @@ -137,6 +137,9 @@ enum pageflags {
> #endif
> #ifdef CONFIG_64BIT
> PG_arch_2,
> +#endif
> +#ifdef CONFIG_PREZERO_PAGE
> + PG_zero,
> #endif
> __NR_PAGEFLAGS,
I don't think this is worth a generic page->flags bit.
There's a ton of space in 'struct page' for pages that are in the
allocator. Can't we use some of that space?
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