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From: Matthew Wilcox <willy@infradead.org>
To: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>,
	David Hildenbrand <david@redhat.com>,
	Muchun Song <songmuchun@bytedance.com>,
	corbet@lwn.net, 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, osalvador@suse.de,
	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 v5 00/21] Free some vmemmap pages of hugetlb page
Date: Mon, 23 Nov 2020 22:01:13 +0000	[thread overview]
Message-ID: <20201123220113.GW4327@casper.infradead.org> (raw)
In-Reply-To: <37f4bf02-c438-9fbd-32ea-8bedbe30c4da@oracle.com>

On Mon, Nov 23, 2020 at 01:52:13PM -0800, Mike Kravetz wrote:
> On 11/22/20 11:38 PM, Michal Hocko wrote:
> > On Fri 20-11-20 09:45:12, Mike Kravetz wrote:
> >> Not sure if I agree with that last statement.  Database and virtualization
> >> use cases from my employer allocate allocate hugetlb pages after boot.  It
> >> is shortly after boot, but still not from boot/kernel command line.
> > 
> > Is there any strong reason for that?
> 
> The reason I have been given is that it is preferable to have SW compute
> the number of needed huge pages after boot based on total memory, rather
> than have a sysadmin calculate the number and add a boot parameter.

Oh, I remember this bug!  I think it was posted publically, even.
If the sysadmin configures, say, 90% of the RAM to be hugepages and
then a DIMM fails and the sysadmin doesn't remember to adjust the boot
parameter, Linux does some pretty horrible things and the symptom is
"Linux doesn't boot".


  reply	other threads:[~2020-11-23 22:02 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
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 [this message]
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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