From: "Zengtao (B)" <prime.zeng@hisilicon.com>
To: "yulei.kernel@gmail.com" <yulei.kernel@gmail.com>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"naoya.horiguchi@nec.com" <naoya.horiguchi@nec.com>,
"viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
"pbonzini@redhat.com" <pbonzini@redhat.com>
Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"xiaoguangrong.eric@gmail.com" <xiaoguangrong.eric@gmail.com>,
"kernellwp@gmail.com" <kernellwp@gmail.com>,
"lihaiwei.kernel@gmail.com" <lihaiwei.kernel@gmail.com>,
Yulei Zhang <yuleixzhang@tencent.com>
Subject: RE: [PATCH 00/35] Enhance memory utilization with DMEMFS
Date: Mon, 12 Oct 2020 11:57:20 +0000 [thread overview]
Message-ID: <678F3D1BB717D949B966B68EAEB446ED49E01801@dggemm526-mbx.china.huawei.com> (raw)
In-Reply-To: <cover.1602093760.git.yuleixzhang@tencent.com>
> -----Original Message-----
> From: yulei.kernel@gmail.com [mailto:yulei.kernel@gmail.com]
> Sent: Thursday, October 08, 2020 3:54 PM
> To: akpm@linux-foundation.org; naoya.horiguchi@nec.com;
> viro@zeniv.linux.org.uk; pbonzini@redhat.com
> Cc: linux-fsdevel@vger.kernel.org; kvm@vger.kernel.org;
> linux-kernel@vger.kernel.org; xiaoguangrong.eric@gmail.com;
> kernellwp@gmail.com; lihaiwei.kernel@gmail.com; Yulei Zhang
> Subject: [PATCH 00/35] Enhance memory utilization with DMEMFS
>
> From: Yulei Zhang <yuleixzhang@tencent.com>
>
> In current system each physical memory page is assocaited with
> a page structure which is used to track the usage of this page.
> But due to the memory usage rapidly growing in cloud environment,
> we find the resource consuming for page structure storage becomes
> highly remarkable. So is it an expense that we could spare?
>
> This patchset introduces an idea about how to save the extra
> memory through a new virtual filesystem -- dmemfs.
>
> Dmemfs (Direct Memory filesystem) is device memory or reserved
> memory based filesystem. This kind of memory is special as it
> is not managed by kernel and most important it is without 'struct page'.
> Therefore we can leverage the extra memory from the host system
> to support more tenants in our cloud service.
>
> We uses a kernel boot parameter 'dmem=' to reserve the system
> memory when the host system boots up, the details can be checked
> in /Documentation/admin-guide/kernel-parameters.txt.
>
> Theoretically for each 4k physical page it can save 64 bytes if
> we drop the 'struct page', so for guest memory with 320G it can
> save about 5G physical memory totally.
Sounds interesting, but seems your patch only support x86, have you
considered aarch64?
Regards
Zengtao
next prev parent reply other threads:[~2020-10-12 12:13 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-08 7:53 [PATCH 00/35] Enhance memory utilization with DMEMFS yulei.kernel
2020-10-08 7:53 ` [PATCH 01/35] fs: introduce dmemfs module yulei.kernel
2020-11-10 20:04 ` Al Viro
2020-11-11 8:53 ` yulei zhang
2020-11-11 23:09 ` Al Viro
2020-11-12 10:03 ` yulei zhang
2020-10-08 7:53 ` [PATCH 02/35] mm: support direct memory reservation yulei.kernel
2020-10-08 20:27 ` Randy Dunlap
2020-10-08 20:34 ` Randy Dunlap
2020-10-08 7:53 ` [PATCH 03/35] dmem: implement dmem memory management yulei.kernel
2020-10-08 7:53 ` [PATCH 04/35] dmem: let pat recognize dmem yulei.kernel
2020-10-13 7:27 ` Paolo Bonzini
2020-10-13 9:53 ` yulei zhang
2020-10-08 7:53 ` [PATCH 05/35] dmemfs: support mmap yulei.kernel
2020-10-08 7:53 ` [PATCH 06/35] dmemfs: support truncating inode down yulei.kernel
2020-10-08 7:53 ` [PATCH 07/35] dmem: trace core functions yulei.kernel
2020-10-08 7:53 ` [PATCH 08/35] dmem: show some statistic in debugfs yulei.kernel
2020-10-08 20:23 ` Randy Dunlap
2020-10-09 11:49 ` yulei zhang
2020-10-08 7:53 ` [PATCH 09/35] dmemfs: support remote access yulei.kernel
2020-10-08 7:54 ` [PATCH 10/35] dmemfs: introduce max_alloc_try_dpages parameter yulei.kernel
2020-10-08 7:54 ` [PATCH 11/35] mm: export mempolicy interfaces to serve dmem allocator yulei.kernel
2020-10-08 7:54 ` [PATCH 12/35] dmem: introduce mempolicy support yulei.kernel
2020-10-08 7:54 ` [PATCH 13/35] mm, dmem: introduce PFN_DMEM and pfn_t_dmem yulei.kernel
2020-10-08 7:54 ` [PATCH 14/35] mm, dmem: dmem-pmd vs thp-pmd yulei.kernel
2020-10-08 7:54 ` [PATCH 15/35] mm: add pmd_special() check for pmd_trans_huge_lock() yulei.kernel
2020-10-08 7:54 ` [PATCH 16/35] dmemfs: introduce ->split() to dmemfs_vm_ops yulei.kernel
2020-10-08 7:54 ` [PATCH 17/35] mm, dmemfs: support unmap_page_range() for dmemfs pmd yulei.kernel
2020-10-08 7:54 ` [PATCH 18/35] mm: follow_pmd_mask() for dmem huge pmd yulei.kernel
2020-10-08 7:54 ` [PATCH 19/35] mm: gup_huge_pmd() " yulei.kernel
2020-10-08 7:54 ` [PATCH 20/35] mm: support dmem huge pmd for vmf_insert_pfn_pmd() yulei.kernel
2020-10-08 7:54 ` [PATCH 21/35] mm: support dmem huge pmd for follow_pfn() yulei.kernel
2020-10-08 7:54 ` [PATCH 22/35] kvm, x86: Distinguish dmemfs page from mmio page yulei.kernel
2020-10-09 0:58 ` Sean Christopherson
2020-10-09 10:28 ` Joao Martins
2020-10-09 11:42 ` yulei zhang
2020-10-08 7:54 ` [PATCH 23/35] kvm, x86: introduce VM_DMEM yulei.kernel
2020-10-08 7:54 ` [PATCH 24/35] dmemfs: support hugepage for dmemfs yulei.kernel
2020-10-08 7:54 ` [PATCH 25/35] mm, x86, dmem: fix estimation of reserved page for vaddr_get_pfn() yulei.kernel
2020-10-08 7:54 ` [PATCH 26/35] mm, dmem: introduce pud_special() yulei.kernel
2020-10-08 7:54 ` [PATCH 27/35] mm: add pud_special() to support dmem huge pud yulei.kernel
2020-10-08 7:54 ` [PATCH 28/35] mm, dmemfs: support huge_fault() for dmemfs yulei.kernel
2020-10-08 7:54 ` [PATCH 29/35] mm: add follow_pte_pud() yulei.kernel
2020-10-08 7:54 ` [PATCH 30/35] dmem: introduce dmem_bitmap_alloc() and dmem_bitmap_free() yulei.kernel
2020-10-08 7:54 ` [PATCH 31/35] dmem: introduce mce handler yulei.kernel
2020-10-08 7:54 ` [PATCH 32/35] mm, dmemfs: register and handle the dmem mce yulei.kernel
2020-10-08 7:54 ` [PATCH 33/35] kvm, x86: temporary disable record_steal_time for dmem yulei.kernel
2020-10-08 7:54 ` [PATCH 34/35] dmem: add dmem unit tests yulei.kernel
2020-10-08 7:54 ` [PATCH 35/35] Add documentation for dmemfs yulei.kernel
2020-10-09 1:26 ` Randy Dunlap
2020-10-08 19:01 ` [PATCH 00/35] Enhance memory utilization with DMEMFS Joao Martins
2020-10-09 11:39 ` yulei zhang
2020-10-09 11:53 ` Joao Martins
2020-10-10 8:15 ` yulei zhang
2020-10-12 10:59 ` Joao Martins
2020-10-14 22:25 ` Dan Williams
2020-10-19 13:37 ` Paolo Bonzini
2020-10-19 19:03 ` Joao Martins
2020-10-20 15:22 ` yulei zhang
2020-10-12 11:57 ` Zengtao (B) [this message]
2020-10-13 2:45 ` yulei zhang
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