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From: Randy Dunlap <rdunlap@infradead.org>
To: yulei.kernel@gmail.com, 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 <yuleixzhang@tencent.com>,
	Xiao Guangrong <gloryxiao@tencent.com>
Subject: Re: [PATCH 02/35] mm: support direct memory reservation
Date: Thu, 8 Oct 2020 13:34:10 -0700	[thread overview]
Message-ID: <b1703e32-052a-e56b-a4d3-ddd361953f6d@infradead.org> (raw)
In-Reply-To: <2fbc347a5f52591fc9da8d708fef0be238eb06a5.1602093760.git.yuleixzhang@tencent.com>

On 10/8/20 12:53 AM, yulei.kernel@gmail.com wrote:
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index a1068742a6df..da15d4fc49db 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -980,6 +980,44 @@
>  			The filter can be disabled or changed to another
>  			driver later using sysfs.
>  
> +	dmem=[!]size[KMG]
> +			[KNL, NUMA] When CONFIG_DMEM is set, this means
> +			the size of memory reserved for dmemfs on each numa

			                                               NUMA

> +			memory node and 'size' must be aligned to the default
> +			alignment that is the size of memory section which is
> +			128M on default on x86_64. If set '!', such amount of

			     by default

> +			memory on each node will be owned by kernel and dmemfs
> +			own the rest of memory on each node.

			owns

> +			Example: Reserve 4G memory on each node for dmemfs
> +				dmem = 4G

IIRC, you don't want spaces in this example.
Or did you check? Does the kernel's command line parser accept & ignore spaces like these?


> +
> +	dmem=[!]size[KMG]:align[KMG]
> +			[KNL, NUMA] Ditto. 'align' should be power of two and
> +			it's not smaller than the default alignment. Also

	drop "it's"

> +			'size' must be aligned to 'align'.
> +			Example: Bad dmem parameter because 'size' misaligned
> +				dmem=0x40200000:1G
> +
> +	dmem=size[KMG]@addr[KMG]
> +			[KNL] When CONFIG_DMEM is set, this marks specific
> +			memory as reserved for dmemfs. Region of memory will be
> +			used by dmemfs, from addr to addr + size. Reserving a
> +			certain memory region for kernel is illegal so '!' is
> +			forbidden. Should not assign 'addr' to 0 because kernel
> +			will occupy fixed memory region begin at 0 address.

			                                beginning

> +			Ditto, 'size' and 'addr' must be aligned to default
> +			alignment.
> +			Example: Exclude memory from 5G-6G for dmemfs.
> +				dmem=1G@5G
> +
> +	dmem=size[KMG]@addr[KMG]:align[KMG]
> +			[KNL] Ditto. 'align' should be power of two and it's

		Drop "it's"

> +			not smaller than the default alignment. Also 'size'
> +			and 'addr' must be aligned to 'align'. Specially,
> +			'@addr' and ':align' could occur in any order.
> +			Example: Exclude memory from 5G-6G for dmemfs.
> +				dmem=1G:1G@5G
> +
>  	driver_async_probe=  [KNL]
>  			List of driver names to be probed asynchronously.
>  			Format: <driver_name1>,<driver_name2>...


-- 
~Randy
Reported-by: Randy Dunlap <rdunlap@infradead.org>

  parent reply	other threads:[~2020-10-08 20:34 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 [this message]
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)
2020-10-13  2:45   ` yulei zhang

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