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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Jeff Moyer <jmoyer@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
	Oscar Salvador <osalvador@suse.de>, Qian Cai <cai@lca.pw>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linux MM <linux-mm@kvack.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-nvdimm <linux-nvdimm@lists.01.org>
Subject: Re: [PATCH -next] mm/hotplug: skip bad PFNs from pfn_to_online_page()
Date: Fri, 14 Jun 2019 23:10:36 +0530
Message-ID: <4e912883-4a85-6579-0779-6c366ccee407@linux.ibm.com> (raw)
In-Reply-To: <x49ef3wytzz.fsf@segfault.boston.devel.redhat.com>

On 6/14/19 10:38 PM, Jeff Moyer wrote:
> "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> writes:
> 
>> On 6/14/19 10:06 PM, Dan Williams wrote:
>>> On Fri, Jun 14, 2019 at 9:26 AM Aneesh Kumar K.V
>>> <aneesh.kumar@linux.ibm.com> wrote:
>>
>>>> Why not let the arch
>>>> arch decide the SUBSECTION_SHIFT and default to one subsection per
>>>> section if arch is not enabled to work with subsection.
>>>
>>> Because that keeps the implementation from ever reaching a point where
>>> a namespace might be able to be moved from one arch to another. If we
>>> can squash these arch differences then we can have a common tool to
>>> initialize namespaces outside of the kernel. The one wrinkle is
>>> device-dax that wants to enforce the mapping size,
>>
>> The fsdax have a much bigger issue right? The file system block size
>> is the same as PAGE_SIZE and we can't make it portable across archs
>> that support different PAGE_SIZE?
> 
> File system blocks are not tied to page size.  They can't be *bigger*
> than the page size currently, but they can be smaller.
> 


ppc64 page size is 64K.

> Still, I don't see that as an arugment against trying to make the
> namespaces work across architectures.  Consider a user who only has
> sector mode namespaces.  We'd like that to work if at all possible.
> 

agreed. I was trying to list out the challenges here.

-aneesh


  parent reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-12 19:15 Qian Cai
2019-06-12 19:37 ` Dan Williams
2019-06-12 19:38   ` Dan Williams
2019-06-12 21:47     ` Qian Cai
2019-06-12 21:52       ` Dan Williams
2019-06-12 23:13         ` Dan Williams
2019-06-13  0:06       ` Dan Williams
2019-06-14  8:58       ` Aneesh Kumar K.V
2019-06-14 14:59         ` Qian Cai
2019-06-14 18:03           ` Dan Williams
2019-06-14 18:57             ` Dan Williams
2019-06-14 19:40               ` Qian Cai
2019-06-14 19:48                 ` Dan Williams
2019-06-14 20:43                   ` Qian Cai
2019-06-16 15:42                     ` Dan Williams
2019-06-17  2:25                       ` Qian Cai
2019-06-14 15:35         ` Oscar Salvador
2019-06-14 16:18           ` Aneesh Kumar K.V
2019-06-14 16:22             ` Dan Williams
2019-06-14 16:26               ` Aneesh Kumar K.V
2019-06-14 16:36                 ` Dan Williams
2019-06-14 16:50                   ` Aneesh Kumar K.V
2019-06-14 16:55                   ` Aneesh Kumar K.V
2019-06-14 17:08                     ` Jeff Moyer
2019-06-14 17:14                       ` Dan Williams
2019-06-14 17:40                       ` Aneesh Kumar K.V [this message]
2019-06-16  3:49               ` Aneesh Kumar K.V
2019-06-17 17:21                 ` Dan Williams
2019-06-13 18:42   ` Qian Cai
2019-06-14  1:17     ` Dan Williams
2019-06-14  1:29       ` Qian Cai

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