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From: Oscar Salvador <osalvador@suse.de>
To: Muchun Song <songmuchun@bytedance.com>
Cc: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de,
	mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com,
	dave.hansen@linux.intel.com, luto@kernel.org,
	peterz@infradead.org, viro@zeniv.linux.org.uk,
	akpm@linux-foundation.org, paulmck@kernel.org,
	mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com,
	rdunlap@infradead.org, oneukum@suse.com,
	anshuman.khandual@arm.com, jroedel@suse.de,
	almasrymina@google.com, rientjes@google.com, willy@infradead.org,
	mhocko@suse.com, song.bao.hua@hisilicon.com,
	duanxiongchun@bytedance.com, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v6 07/16] x86/mm/64: Disable PMD page mapping of vmemmap
Date: Tue, 24 Nov 2020 11:24:45 +0100	[thread overview]
Message-ID: <20201124102441.GA24718@linux> (raw)
In-Reply-To: <20201124095259.58755-8-songmuchun@bytedance.com>

On Tue, Nov 24, 2020 at 05:52:50PM +0800, Muchun Song wrote:
> If we enable the CONFIG_HUGETLB_PAGE_FREE_VMEMMAP, we can just
> disbale PMD page mapping of vmemmap to simplify the code. In this
> case, we do not need complex code doing vmemmap page table
> manipulation. This is a way to simply the first version of this
> patch series. In the future, we can add some code doing page table
> manipulation.

IIRC, CONFIG_HUGETLB_PAGE_FREE_VMEMMAP was supposed to be enabled by default,
right?
And we would control whether we __really__ want to this by a boot option,
which was disabled by default?

If you go for populating the memmap with basepages by checking
CONFIG_HUGETLB_PAGE_FREE_VMEMMAP, would not everybody, even the ones that
did not enable this by the boot option be affected?

-- 
Oscar Salvador
SUSE L3

  reply	other threads:[~2020-11-24 10:24 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-24  9:52 [PATCH v6 00/16] Free some vmemmap pages of hugetlb page Muchun Song
2020-11-24  9:52 ` [PATCH v6 01/16] mm/memory_hotplug: Move bootmem info registration API to bootmem_info.c Muchun Song
2021-06-10 12:15   ` chengkaitao
2020-11-24  9:52 ` [PATCH v6 02/16] mm/memory_hotplug: Move {get,put}_page_bootmem() " Muchun Song
2020-11-24  9:52 ` [PATCH v6 03/16] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Muchun Song
2020-11-24  9:52 ` [PATCH v6 04/16] mm/hugetlb: Introduce nr_free_vmemmap_pages in the struct hstate Muchun Song
2020-11-24  9:52 ` [PATCH v6 05/16] mm/bootmem_info: Introduce {free,prepare}_vmemmap_page() Muchun Song
2020-11-24  9:52 ` [PATCH v6 06/16] mm/hugetlb: Disable freeing vmemmap if struct page size is not power of two Muchun Song
2020-11-24  9:52 ` [PATCH v6 07/16] x86/mm/64: Disable PMD page mapping of vmemmap Muchun Song
2020-11-24 10:24   ` Oscar Salvador [this message]
2020-11-24 10:31     ` Song Bao Hua (Barry Song)
2020-11-24 11:13     ` [External] " Muchun Song
2020-11-24  9:52 ` [PATCH v6 08/16] mm/hugetlb: Free the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-24  9:52 ` [PATCH v6 09/16] mm/hugetlb: Defer freeing of HugeTLB pages Muchun Song
2020-11-24 11:51   ` Michal Hocko
2020-11-24 12:45     ` [External] " Muchun Song
2020-11-24 13:14       ` Michal Hocko
2020-11-24  9:52 ` [PATCH v6 10/16] mm/hugetlb: Allocate the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-24  9:52 ` [PATCH v6 11/16] mm/hugetlb: Introduce remap_huge_page_pmd_vmemmap helper Muchun Song
2020-11-24  9:52 ` [PATCH v6 12/16] mm/hugetlb: Set the PageHWPoison to the raw error page Muchun Song
2020-11-24  9:52 ` [PATCH v6 13/16] mm/hugetlb: Flush work when dissolving hugetlb page Muchun Song
2020-11-24  9:52 ` [PATCH v6 14/16] mm/hugetlb: Add a kernel parameter hugetlb_free_vmemmap Muchun Song
2020-11-24 10:53   ` Song Bao Hua (Barry Song)
2020-11-24 11:07     ` [External] " Muchun Song
2020-11-24  9:52 ` [PATCH v6 15/16] mm/hugetlb: Gather discrete indexes of tail page Muchun Song
2020-11-24  9:52 ` [PATCH v6 16/16] mm/hugetlb: Add BUILD_BUG_ON to catch invalid usage of tail struct page Muchun Song

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