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From: Balbir Singh <bsingharora@gmail.com>
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,
	osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com,
	david@redhat.com, naoya.horiguchi@nec.com,
	joao.m.martins@oracle.com, duanxiongchun@bytedance.com,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	Miaohe Lin <linmiaohe@huawei.com>
Subject: Re: [PATCH v17 2/9] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP
Date: Thu, 4 Mar 2021 16:06:19 +1100	[thread overview]
Message-ID: <20210304050619.GC1223287@balbir-desktop> (raw)
In-Reply-To: <20210225132130.26451-3-songmuchun@bytedance.com>

On Thu, Feb 25, 2021 at 09:21:23PM +0800, Muchun Song wrote:
> The option HUGETLB_PAGE_FREE_VMEMMAP allows for the freeing of
> some vmemmap pages associated with pre-allocated HugeTLB pages.
> For example, on X86_64 6 vmemmap pages of size 4KB each can be
> saved for each 2MB HugeTLB page. 4094 vmemmap pages of size 4KB
> each can be saved for each 1GB HugeTLB page.
> 
> When a HugeTLB page is allocated or freed, the vmemmap array
> representing the range associated with the page will need to be
> remapped. When a page is allocated, vmemmap pages are freed
> after remapping. When a page is freed, previously discarded
> vmemmap pages must be allocated before remapping.
> 
> The config option is introduced early so that supporting code
> can be written to depend on the option. The initial version of
> the code only provides support for x86-64.
> 
> Like other code which frees vmemmap, this config option depends on
> HAVE_BOOTMEM_INFO_NODE. The routine register_page_bootmem_info() is
> used to register bootmem info. Therefore, make sure
> register_page_bootmem_info is enabled if HUGETLB_PAGE_FREE_VMEMMAP
> is defined.
> 
> Signed-off-by: Muchun Song <songmuchun@bytedance.com>
> Reviewed-by: Oscar Salvador <osalvador@suse.de>
> Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
> ---

Reviewed-by: Balbir Singh <bsingharora@gmail.com>


  reply	other threads:[~2021-03-04  5:06 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-25 13:21 [PATCH v17 0/9] Free some vmemmap pages of HugeTLB page Muchun Song
2021-02-25 13:21 ` [PATCH v17 1/9] mm: memory_hotplug: factor out bootmem core functions to bootmem_info.c Muchun Song
2021-03-03  2:45   ` Singh, Balbir
2021-03-04  4:26     ` Balbir Singh
2021-03-04  5:50       ` [External] " Muchun Song
2021-02-25 13:21 ` [PATCH v17 2/9] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Muchun Song
2021-03-04  5:06   ` Balbir Singh [this message]
2021-02-25 13:21 ` [PATCH v17 3/9] mm: hugetlb: free the vmemmap pages associated with each HugeTLB page Muchun Song
2021-03-04 23:50   ` Singh, Balbir
2021-03-05  4:41     ` [External] " Muchun Song
2021-02-25 13:21 ` [PATCH v17 4/9] mm: hugetlb: alloc " Muchun Song
2021-03-01  5:29   ` Muchun Song
2021-03-03  2:03   ` Mike Kravetz
2021-03-03  3:36     ` [External] " Muchun Song
2021-03-05  8:55   ` Balbir Singh
2021-03-05  9:30     ` [External] " Muchun Song
2021-02-25 13:21 ` [PATCH v17 5/9] mm: hugetlb: set the PageHWPoison to the raw error page Muchun Song
2021-03-07  8:18   ` Balbir Singh
2021-03-07  8:39     ` [External] " Muchun Song
2021-02-25 13:21 ` [PATCH v17 6/9] mm: hugetlb: add a kernel parameter hugetlb_free_vmemmap Muchun Song
2021-02-25 13:21 ` [PATCH v17 7/9] mm: hugetlb: introduce nr_free_vmemmap_pages in the struct hstate Muchun Song
2021-02-25 13:21 ` [PATCH v17 8/9] mm: hugetlb: gather discrete indexes of tail page Muchun Song
2021-02-25 13:21 ` [PATCH v17 9/9] mm: hugetlb: optimize the code with the help of the compiler Muchun Song
2021-03-04  3:14 ` [PATCH v17 0/9] Free some vmemmap pages of HugeTLB page Singh, Balbir
2021-03-04  3:36   ` [External] " Muchun Song
2021-03-04  4:25     ` Balbir Singh

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