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From: Matthew Wilcox <[email protected]>
To: David Hildenbrand <[email protected]>
Cc: Andrew Morton <[email protected]>,
	Jens Axboe <[email protected]>,
	[email protected], [email protected]
Subject: Re: [PATCH 9/9] mm: Free up a word in the first tail page
Date: Tue, 15 Aug 2023 12:39:58 +0100	[thread overview]
Message-ID: <ZNtkDnjofzKpvM/[email protected]> (raw)
In-Reply-To: <[email protected]>

On Tue, Aug 15, 2023 at 09:59:08AM +0200, David Hildenbrand wrote:
> On 15.08.23 05:26, Matthew Wilcox (Oracle) wrote:
> > Store the folio order in the low byte of the flags word in the first
> > tail page.  This frees up the word that was being used to store the
> > order and dtor bytes previously.
> > 
> 
> Is there still a free flag in page[1] after this change? I need one, at
> least for a prototype I'm working on. (could fallback to page[2], though
> eventually, though)

There are only ~13 flags used in page[1] at this point.  Plenty of
space.

  reply	other threads:[~2023-08-15 11:40 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-08-15  3:26 [PATCH 0/9] Remove _folio_dtor and _folio_order Matthew Wilcox (Oracle)
2023-08-15  3:26 ` [PATCH 1/9] io_uring: Stop calling free_compound_page() Matthew Wilcox (Oracle)
2023-08-15  7:33   ` David Hildenbrand
2023-08-15 15:00   ` Jens Axboe
2023-08-15 15:36     ` Matthew Wilcox
2023-08-15  3:26 ` [PATCH 2/9] mm: Call the hugetlb destructor directly Matthew Wilcox (Oracle)
2023-08-15  7:36   ` David Hildenbrand
2023-08-15  3:26 ` [PATCH 3/9] mm: Call free_transhuge_folio() directly from destroy_large_folio() Matthew Wilcox (Oracle)
2023-08-15  6:13   ` kernel test robot
2023-08-15  7:40   ` David Hildenbrand
2023-08-15 14:06     ` Matthew Wilcox
2023-08-15  8:09   ` kernel test robot
2023-08-15  3:26 ` [PATCH 4/9] mm: Make free_compound_page() static Matthew Wilcox (Oracle)
2023-08-15  7:47   ` David Hildenbrand
2023-08-15  7:48     ` David Hildenbrand
2023-08-15  3:26 ` [PATCH 5/9] mm: Remove free_compound_page() Matthew Wilcox (Oracle)
2023-08-15  7:48   ` David Hildenbrand
2023-08-15  3:26 ` [PATCH 6/9] mm: Remove HUGETLB_PAGE_DTOR Matthew Wilcox (Oracle)
2023-08-15  7:50   ` David Hildenbrand
2023-08-15  3:26 ` [PATCH 7/9] mm: Add deferred_list page flag Matthew Wilcox (Oracle)
2023-08-15  7:54   ` David Hildenbrand
2023-08-15 15:32     ` Matthew Wilcox
2023-08-15 16:40       ` David Hildenbrand
2023-08-15 17:06         ` Matthew Wilcox
2023-08-15 17:27           ` David Hildenbrand
2023-08-15 19:58             ` Matthew Wilcox
2023-08-16  3:14               ` Matthew Wilcox
2023-08-16 10:12                 ` David Hildenbrand
2023-08-16 12:05                   ` Matthew Wilcox
2023-08-16 12:34                     ` David Hildenbrand
2023-08-16  9:55               ` David Hildenbrand
2023-08-15  3:26 ` [PATCH 8/9] mm: Rearrange page flags Matthew Wilcox (Oracle)
2023-08-15  4:30   ` Yosry Ahmed
2023-08-15 19:24   ` Peter Xu
2023-08-15 20:07     ` Matthew Wilcox
2023-08-15 22:31       ` Yosry Ahmed
2023-08-15 23:01         ` Matthew Wilcox
2023-08-15 23:33           ` Yosry Ahmed
2023-08-15  3:26 ` [PATCH 9/9] mm: Free up a word in the first tail page Matthew Wilcox (Oracle)
2023-08-15  7:59   ` David Hildenbrand
2023-08-15 11:39     ` Matthew Wilcox [this message]
2023-08-15 19:21   ` Peter Xu

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