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From: Michal Hocko <mhocko@suse.com>
To: Muchun Song <songmuchun@bytedance.com>
Cc: Jonathan Corbet <corbet@lwn.net>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com,
	dave.hansen@linux.intel.com, luto@kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	viro@zeniv.linux.org.uk,
	Andrew Morton <akpm@linux-foundation.org>,
	paulmck@kernel.org, mchehab+huawei@kernel.org,
	pawan.kumar.gupta@linux.intel.com,
	Randy Dunlap <rdunlap@infradead.org>,
	oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de,
	Mina Almasry <almasrymina@google.com>,
	David Rientjes <rientjes@google.com>,
	Matthew Wilcox <willy@infradead.org>,
	Oscar Salvador <osalvador@suse.de>,
	"Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>,
	Xiongchun duan <duanxiongchun@bytedance.com>,
	linux-doc@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	Linux Memory Management List <linux-mm@kvack.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [External] Re: [PATCH v5 03/21] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP
Date: Fri, 20 Nov 2020 09:47:50 +0100	[thread overview]
Message-ID: <20201120084750.GK3200@dhcp22.suse.cz> (raw)
In-Reply-To: <CAMZfGtWuCuuR+N8h-509BbDL8CN+s_djsodPN0Wb1+YHbF9PHw@mail.gmail.com>

On Fri 20-11-20 16:35:16, Muchun Song wrote:
[...]
> > That being said, unless there are huge advantages to introduce a
> > config option I would rather not add it because our config space is huge
> > already and the more we add the more future code maintainance that will
> > add. If you want the config just for dependency checks then fine by me.
> 
> Yeah, it is only for dependency checks :)

OK, I must have misread the definition to think that it requires user to
enable explicitly.

Anyway this feature cannot be really on by default due to overhead. So
the command line option default has to be flipped.

-- 
Michal Hocko
SUSE Labs

  reply	other threads:[~2020-11-20  8:48 UTC|newest]

Thread overview: 98+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-20  6:43 [PATCH v5 00/21] Free some vmemmap pages of hugetlb page Muchun Song
2020-11-20  6:43 ` [PATCH v5 01/21] mm/memory_hotplug: Move bootmem info registration API to bootmem_info.c Muchun Song
2020-11-20  6:43 ` [PATCH v5 02/21] mm/memory_hotplug: Move {get,put}_page_bootmem() " Muchun Song
2020-11-20  6:43 ` [PATCH v5 03/21] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Muchun Song
2020-11-20  7:49   ` Michal Hocko
2020-11-20  8:35     ` [External] " Muchun Song
2020-11-20  8:35       ` Muchun Song
2020-11-20  8:47       ` Michal Hocko [this message]
2020-11-20  8:53         ` Muchun Song
2020-11-20  8:53           ` Muchun Song
2020-11-20  6:43 ` [PATCH v5 04/21] mm/hugetlb: Introduce nr_free_vmemmap_pages in the struct hstate Muchun Song
2020-11-20  6:43 ` [PATCH v5 05/21] mm/hugetlb: Introduce pgtable allocation/freeing helpers Muchun Song
2020-11-20  6:43 ` [PATCH v5 06/21] mm/bootmem_info: Introduce {free,prepare}_vmemmap_page() Muchun Song
2020-11-20  6:43 ` [PATCH v5 07/21] mm/bootmem_info: Combine bootmem info and type into page->freelist Muchun Song
2020-11-20  6:43 ` [PATCH v5 08/21] mm/hugetlb: Initialize page table lock for vmemmap Muchun Song
2020-11-20  6:43 ` [PATCH v5 09/21] mm/hugetlb: Free the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-20  6:43 ` [PATCH v5 10/21] mm/hugetlb: Defer freeing of hugetlb pages Muchun Song
2020-11-20  6:43 ` [PATCH v5 11/21] mm/hugetlb: Allocate the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-20  8:11   ` Michal Hocko
2020-11-20  8:51     ` [External] " Muchun Song
2020-11-20  8:51       ` Muchun Song
2020-11-20  9:28       ` Michal Hocko
2020-11-20  9:37         ` Muchun Song
2020-11-20  9:37           ` Muchun Song
2020-11-20 11:10           ` Michal Hocko
2020-11-20 11:56             ` Muchun Song
2020-11-20 11:56               ` Muchun Song
2020-11-20  6:43 ` [PATCH v5 12/21] mm/hugetlb: Introduce remap_huge_page_pmd_vmemmap helper Muchun Song
2020-11-20  6:43 ` [PATCH v5 13/21] mm/hugetlb: Use PG_slab to indicate split pmd Muchun Song
2020-11-20  8:16   ` Michal Hocko
2020-11-20  9:30     ` [External] " Muchun Song
2020-11-20  9:30       ` Muchun Song
2020-11-23  7:48       ` Michal Hocko
2020-11-23  8:01         ` Muchun Song
2020-11-23  8:01           ` Muchun Song
2020-11-20  6:43 ` [PATCH v5 14/21] mm/hugetlb: Support freeing vmemmap pages of gigantic page Muchun Song
2020-11-20  6:43 ` [PATCH v5 15/21] mm/hugetlb: Set the PageHWPoison to the raw error page Muchun Song
2020-11-20  8:19   ` Michal Hocko
2020-11-20 10:32     ` [External] " Muchun Song
2020-11-20 10:32       ` Muchun Song
2020-11-20  6:43 ` [PATCH v5 16/21] mm/hugetlb: Flush work when dissolving hugetlb page Muchun Song
2020-11-20  8:20   ` Michal Hocko
2020-11-20  6:43 ` [PATCH v5 17/21] mm/hugetlb: Add a kernel parameter hugetlb_free_vmemmap Muchun Song
2020-11-20  8:22   ` Michal Hocko
2020-11-20 10:39     ` [External] " Muchun Song
2020-11-20 10:39       ` Muchun Song
2020-11-20  6:43 ` [PATCH v5 18/21] mm/hugetlb: Merge pte to huge pmd only for gigantic page Muchun Song
2020-11-20  8:23   ` Michal Hocko
2020-11-20 10:41     ` [External] " Muchun Song
2020-11-20 10:41       ` Muchun Song
2020-11-20  6:43 ` [PATCH v5 19/21] mm/hugetlb: Gather discrete indexes of tail page Muchun Song
2020-11-20  6:43 ` [PATCH v5 20/21] mm/hugetlb: Add BUILD_BUG_ON to catch invalid usage of tail struct page Muchun Song
2020-11-20  6:43 ` [PATCH v5 21/21] mm/hugetlb: Disable freeing vmemmap if struct page size is not power of two Muchun Song
2020-11-20  8:25   ` Michal Hocko
2020-11-20  9:15     ` David Hildenbrand
2020-11-22 13:30       ` Mike Rapoport
2020-11-22 19:00     ` Matthew Wilcox
2020-11-23  3:14       ` [External] " Muchun Song
2020-11-23  3:14         ` Muchun Song
2020-11-20  9:16   ` David Hildenbrand
2020-11-20 10:42     ` [External] " Muchun Song
2020-11-20 10:42       ` Muchun Song
2020-11-20  8:42 ` [PATCH v5 00/21] Free some vmemmap pages of hugetlb page Michal Hocko
2020-11-20  9:27   ` David Hildenbrand
2020-11-20  9:39     ` Michal Hocko
2020-11-20  9:43       ` David Hildenbrand
2020-11-20 17:45         ` Mike Kravetz
2020-11-20 18:00           ` David Hildenbrand
2020-11-22  7:29           ` [External] " Muchun Song
2020-11-22  7:29             ` Muchun Song
2020-11-23  7:38           ` Michal Hocko
2020-11-23 21:52             ` Mike Kravetz
2020-11-23 22:01               ` Matthew Wilcox
2020-11-20 12:40   ` [External] " Muchun Song
2020-11-20 12:40     ` Muchun Song
2020-11-20 13:11     ` Michal Hocko
2020-11-20 15:44       ` Muchun Song
2020-11-20 15:44         ` Muchun Song
2020-11-23  7:40         ` Michal Hocko
2020-11-23  8:53           ` Muchun Song
2020-11-23  8:53             ` Muchun Song
2020-11-23  9:43             ` Michal Hocko
2020-11-23 10:36               ` Muchun Song
2020-11-23 10:36                 ` Muchun Song
2020-11-23 10:42                 ` Michal Hocko
2020-11-23 11:16                   ` Muchun Song
2020-11-23 11:16                     ` Muchun Song
2020-11-23 11:32                     ` Michal Hocko
2020-11-23 12:07                       ` Muchun Song
2020-11-23 12:07                         ` Muchun Song
2020-11-23 12:18                         ` Michal Hocko
2020-11-23 12:40                           ` Muchun Song
2020-11-23 12:40                             ` Muchun Song
2020-11-23 12:48                             ` Michal Hocko
2020-11-23 12:45                   ` Matthew Wilcox
2020-11-23 13:05                     ` Muchun Song
2020-11-23 13:05                       ` Muchun Song
2020-11-23 13:13                     ` Michal Hocko

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