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.
next prev parent 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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