From: Oren Berman <oren@lightbitslabs.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: "linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>
Subject: Re: Detecting NUMA per pmem
Date: Wed, 10 Jan 2018 19:41:19 +0200 [thread overview]
Message-ID: <25EE894A-E894-4C80-9B5B-A8A2B2763662@lightbitslabs.com> (raw)
In-Reply-To: <CAPcyv4hOqiq8LjHv7Qtt5J1SxJouiwvJVvAS9WgzWbcnoWEeQw@mail.gmail.com>
Hi
Thanks for your answer
If we do memremap on the physical address
Of the nvram from within the kernel to get a new virtual address mapping will it lock the mapping?
Can this be also a workaround?
Oren
נשלח מה-iPhone שלי
ב-10 בינו׳ 2018, בשעה 18:38, Dan Williams <dan.j.williams@intel.com> כתב/ה:
>> On Wed, Jan 10, 2018 at 7:23 AM, Oren Berman <oren@lightbitslabs.com> wrote:
>> Now to all of the forum
>>
>> Hi Dan
>>
>> Thanks we are going to try this.
>>
>> Can you explain why this can cause this issue - is the NVDIMM memory space
>> also being randomized?
>> Is it done during runtime?
>>
>
> Yes, kaslr randomizes the direct map. We have seen problems with it in
> the past relative to setting up pmem mappings. We fixed one such bug
> with this commit:
>
> fc5f9d5f151c x86/mm: Fix boot crash caused by incorrect loop count
> calculation in sync_global_pgds()
>
> ...but it appears we may have another bug in this area.
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next prev parent reply other threads:[~2018-01-10 17:36 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAN=ZobSmQ97gRKFaho7DPvXVD18W4145JfTQ5Ncf80Tw17fkGA@mail.gmail.com>
[not found] ` <20171020162227.GA8576@linux.intel.com>
2017-10-22 11:33 ` Detecting NUMA per pmem Oren Berman
2017-10-22 13:52 ` Dan Williams
2017-12-27 18:53 ` Oren Berman
2017-12-28 9:14 ` Dan Williams
2017-12-28 10:03 ` Oren Berman
2017-12-28 18:16 ` Dan Williams
2017-12-31 8:23 ` Yigal Korman
2018-01-09 22:25 ` Oren Berman
2018-01-09 23:05 ` Dan Williams
2018-01-10 7:21 ` Oren Berman
2018-01-10 13:13 ` Oren Berman
2018-01-10 14:51 ` Dan Williams
2018-01-10 15:23 ` Oren Berman
2018-01-10 16:38 ` Dan Williams
2018-01-10 17:41 ` Oren Berman [this message]
2018-06-29 5:17 ` Oren Berman
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