From: "Yin, Fengwei" <fengwei.yin@intel.com>
To: Yu Zhao <yuzhao@google.com>, Ryan Roberts <ryan.roberts@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Matthew Wilcox <willy@infradead.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
David Hildenbrand <david@redhat.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Yang Shi <shy828301@gmail.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>
Subject: Re: [PATCH v2 1/5] mm: Non-pmd-mappable, large folios for folio_add_new_anon_rmap()
Date: Tue, 4 Jul 2023 10:13:34 +0800 [thread overview]
Message-ID: <9e2fe34e-7615-119c-43b3-31d0b8be3af0@intel.com> (raw)
In-Reply-To: <CAOUHufYtW+6Svaq7pcyBiModTSKn1VU-LKxB_Xwnja=f83X2YA@mail.gmail.com>
On 7/4/2023 3:05 AM, Yu Zhao wrote:
> On Mon, Jul 3, 2023 at 7:53 AM Ryan Roberts <ryan.roberts@arm.com> wrote:
>>
>> In preparation for FLEXIBLE_THP support, improve
>> folio_add_new_anon_rmap() to allow a non-pmd-mappable, large folio to be
>> passed to it. In this case, all contained pages are accounted using the
>> "small" pages scheme.
>
> Nit: In this case, all *subpages* are accounted using the *order-0
> folio* (or base page) scheme.
Matthew suggested not to use subpage with folio. Using page with folio:
https://lore.kernel.org/linux-mm/Y9qiS%2FIxZOMx62t6@casper.infradead.org/
>
>> Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
>
> Reviewed-by: Yu Zhao <yuzhao@google.com>
>
>> mm/rmap.c | 26 +++++++++++++++++++-------
>> 1 file changed, 19 insertions(+), 7 deletions(-)
>>
>> diff --git a/mm/rmap.c b/mm/rmap.c
>> index 1d8369549424..82ef5ba363d1 100644
>> --- a/mm/rmap.c
>> +++ b/mm/rmap.c
>> @@ -1278,31 +1278,43 @@ void page_add_anon_rmap(struct page *page, struct vm_area_struct *vma,
>> * This means the inc-and-test can be bypassed.
>> * The folio does not have to be locked.
>> *
>> - * If the folio is large, it is accounted as a THP. As the folio
>> + * If the folio is pmd-mappable, it is accounted as a THP. As the folio
>> * is new, it's assumed to be mapped exclusively by a single process.
>> */
>> void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma,
>> unsigned long address)
>> {
>> - int nr;
>> + int nr = folio_nr_pages(folio);
>> + int i;
>> + struct page *page;
>>
>> - VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma);
>> + VM_BUG_ON_VMA(address < vma->vm_start ||
>> + address + (nr << PAGE_SHIFT) > vma->vm_end, vma);
>> __folio_set_swapbacked(folio);
>>
>> - if (likely(!folio_test_pmd_mappable(folio))) {
>> + if (!folio_test_large(folio)) {
>> /* increment count (starts at -1) */
>> atomic_set(&folio->_mapcount, 0);
>> - nr = 1;
>> + __page_set_anon_rmap(folio, &folio->page, vma, address, 1);
>> + } else if (!folio_test_pmd_mappable(folio)) {
>> + /* increment count (starts at 0) */
>> + atomic_set(&folio->_nr_pages_mapped, nr);
>> +
>> + page = &folio->page;
>> + for (i = 0; i < nr; i++, page++, address += PAGE_SIZE) {
>> + /* increment count (starts at -1) */
>> + atomic_set(&page->_mapcount, 0);
>> + __page_set_anon_rmap(folio, page, vma, address, 1);
>> + }
>
> Nit: use folio_page(), e.g.,
>
> } else if (!folio_test_pmd_mappable(folio)) {
> int i;
>
> for (i = 0; i < nr; i++) {
> struct page *page = folio_page(folio, i);
>
> /* increment count (starts at -1) */
> atomic_set(&page->_mapcount, 0);
> __page_set_anon_rmap(folio, page, vma, address + PAGE_SIZE * i, 1);
> }
> /* increment count (starts at 0) */
> atomic_set(&folio->_nr_pages_mapped, nr);
> } else {
>
>> } else {
>> /* increment count (starts at -1) */
>> atomic_set(&folio->_entire_mapcount, 0);
>> atomic_set(&folio->_nr_pages_mapped, COMPOUND_MAPPED);
>> - nr = folio_nr_pages(folio);
>> __lruvec_stat_mod_folio(folio, NR_ANON_THPS, nr);
>> + __page_set_anon_rmap(folio, &folio->page, vma, address, 1);
>> }
>>
>> __lruvec_stat_mod_folio(folio, NR_ANON_MAPPED, nr);
>> - __page_set_anon_rmap(folio, &folio->page, vma, address, 1);
>> }
next prev parent reply other threads:[~2023-07-04 2:14 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-03 13:53 [PATCH v2 0/5] variable-order, large folios for anonymous memory Ryan Roberts
2023-07-03 13:53 ` [PATCH v2 1/5] mm: Non-pmd-mappable, large folios for folio_add_new_anon_rmap() Ryan Roberts
2023-07-03 19:05 ` Yu Zhao
2023-07-04 2:13 ` Yin, Fengwei [this message]
2023-07-04 11:19 ` Ryan Roberts
2023-07-04 2:14 ` Yin, Fengwei
2023-07-03 13:53 ` [PATCH v2 2/5] mm: Allow deferred splitting of arbitrary large anon folios Ryan Roberts
2023-07-07 8:21 ` Huang, Ying
2023-07-07 9:42 ` Ryan Roberts
2023-07-10 5:37 ` Huang, Ying
2023-07-10 8:29 ` Ryan Roberts
2023-07-10 9:01 ` Huang, Ying
2023-07-10 9:39 ` Ryan Roberts
2023-07-11 1:56 ` Huang, Ying
2023-07-03 13:53 ` [PATCH v2 3/5] mm: Default implementation of arch_wants_pte_order() Ryan Roberts
2023-07-03 19:50 ` Yu Zhao
2023-07-04 13:20 ` Ryan Roberts
2023-07-05 2:07 ` Yu Zhao
2023-07-05 9:11 ` Ryan Roberts
2023-07-05 17:24 ` Yu Zhao
2023-07-05 18:01 ` Ryan Roberts
2023-07-06 19:33 ` Matthew Wilcox
2023-07-07 10:00 ` Ryan Roberts
2023-07-04 2:22 ` Yin, Fengwei
2023-07-04 3:02 ` Yu Zhao
2023-07-04 3:59 ` Yu Zhao
2023-07-04 5:22 ` Yin, Fengwei
2023-07-04 5:42 ` Yu Zhao
2023-07-04 12:36 ` Ryan Roberts
2023-07-04 13:23 ` Ryan Roberts
2023-07-05 1:40 ` Yu Zhao
2023-07-05 1:23 ` Yu Zhao
2023-07-05 2:18 ` Yin Fengwei
2023-07-03 13:53 ` [PATCH v2 4/5] mm: FLEXIBLE_THP for improved performance Ryan Roberts
2023-07-03 15:51 ` kernel test robot
2023-07-03 16:01 ` kernel test robot
2023-07-04 1:35 ` Yu Zhao
2023-07-04 14:08 ` Ryan Roberts
2023-07-04 23:47 ` Yu Zhao
2023-07-04 3:45 ` Yin, Fengwei
2023-07-04 14:20 ` Ryan Roberts
2023-07-04 23:35 ` Yin Fengwei
2023-07-04 23:57 ` Matthew Wilcox
2023-07-05 9:54 ` Ryan Roberts
2023-07-05 12:08 ` Matthew Wilcox
2023-07-07 8:01 ` Huang, Ying
2023-07-07 9:52 ` Ryan Roberts
2023-07-07 11:29 ` David Hildenbrand
2023-07-07 13:57 ` Matthew Wilcox
2023-07-07 14:07 ` David Hildenbrand
2023-07-07 15:13 ` Ryan Roberts
2023-07-07 16:06 ` David Hildenbrand
2023-07-07 16:22 ` Ryan Roberts
2023-07-07 19:06 ` David Hildenbrand
2023-07-10 8:41 ` Ryan Roberts
2023-07-10 3:03 ` Huang, Ying
2023-07-10 8:55 ` Ryan Roberts
2023-07-10 9:18 ` Huang, Ying
2023-07-10 9:25 ` Ryan Roberts
2023-07-11 0:48 ` Huang, Ying
2023-07-10 2:49 ` Huang, Ying
2023-07-03 13:53 ` [PATCH v2 5/5] arm64: mm: Override arch_wants_pte_order() Ryan Roberts
2023-07-03 20:02 ` Yu Zhao
2023-07-04 2:18 ` [PATCH v2 0/5] variable-order, large folios for anonymous memory Yu Zhao
2023-07-04 6:22 ` Yin, Fengwei
2023-07-04 7:11 ` Yu Zhao
2023-07-04 15:36 ` Ryan Roberts
2023-07-04 23:52 ` Yin Fengwei
2023-07-05 0:21 ` Yu Zhao
2023-07-05 10:16 ` Ryan Roberts
2023-07-05 19:00 ` Yu Zhao
2023-07-05 19:38 ` David Hildenbrand
2023-07-06 8:02 ` Ryan Roberts
2023-07-07 11:40 ` David Hildenbrand
2023-07-07 13:12 ` Matthew Wilcox
2023-07-07 13:24 ` David Hildenbrand
2023-07-10 10:07 ` Ryan Roberts
2023-07-10 16:57 ` Matthew Wilcox
2023-07-10 16:53 ` Zi Yan
2023-07-19 15:49 ` Ryan Roberts
2023-07-19 16:05 ` Zi Yan
2023-07-19 18:37 ` Ryan Roberts
2023-07-11 21:11 ` Luis Chamberlain
2023-07-11 21:59 ` Matthew Wilcox
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