From: Anshuman Khandual <anshuman.khandual@arm.com>
To: Steven Price <steven.price@arm.com>,
Robin Murphy <robin.murphy@arm.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
akpm@linux-foundation.org, will.deacon@arm.com,
catalin.marinas@arm.com
Cc: mark.rutland@arm.com, mhocko@suse.com, david@redhat.com,
logang@deltatee.com, cai@lca.pw, pasha.tatashin@oracle.com,
james.morse@arm.com, cpandya@codeaurora.org,
arunks@codeaurora.org, dan.j.williams@intel.com,
mgorman@techsingularity.net, osalvador@suse.de
Subject: Re: [PATCH 2/6] arm64/mm: Enable memory hot remove
Date: Thu, 4 Apr 2019 12:21:28 +0530 [thread overview]
Message-ID: <c52f0adf-5764-19b8-235e-4c37148388aa@arm.com> (raw)
In-Reply-To: <e191ddcb-271c-57f3-091f-eacaac2e86e0@arm.com>
On 04/03/2019 06:45 PM, Steven Price wrote:
> On 03/04/2019 13:37, Robin Murphy wrote:
>> [ +Steve ]
>>
>> Hi Anshuman,
Hi Steve,
>>
>> On 03/04/2019 05:30, Anshuman Khandual wrote:
>
> <snip>
>
>>> diff --git a/arch/arm64/include/asm/pgtable.h
>>> b/arch/arm64/include/asm/pgtable.h
>>> index de70c1e..858098e 100644
>>> --- a/arch/arm64/include/asm/pgtable.h
>>> +++ b/arch/arm64/include/asm/pgtable.h
>>> @@ -355,6 +355,18 @@ static inline int pmd_protnone(pmd_t pmd)
>>> }
>>> #endif
>>> +#if (CONFIG_PGTABLE_LEVELS > 2)
>>> +#define pmd_large(pmd) (pmd_val(pmd) && !(pmd_val(pmd) &
>>> PMD_TABLE_BIT))
>>> +#else
>>> +#define pmd_large(pmd) 0
>>> +#endif
>>> +
>>> +#if (CONFIG_PGTABLE_LEVELS > 3)
>>> +#define pud_large(pud) (pud_val(pud) && !(pud_val(pud) &
>>> PUD_TABLE_BIT))
>>> +#else
>>> +#define pud_large(pmd) 0
>>> +#endif
>>
>> These seem rather different from the versions that Steve is proposing in
>> the generic pagewalk series - can you reach an agreement on which
>> implementation is preferred?
>
> Indeed this doesn't match the version in my series although is quite
> similar.
>
> My desire is that p?d_large represents the hardware architectural
> definition of large page/huge page/section (pick your naming). Although
> now I look more closely this is actually broken in my series (I'll fix
> that up and send a new version shortly) - p?d_sect() is similarly
> conditional.
>
> Is there a good reason not to use the existing p?d_sect() macros
> available on arm64?
Nothing specific. Now I just tried using pud|pmd_sect() which looks good on
multiple configs for 4K/16K/64K. Will migrate pmd|pud_large() to more arch
specific pmd|pud_sect() which would also help in staying clear from your
series.
>
> I'm also surprised by the CONFIG_PGTABLE_LEVEL conditions as they don't
> match the existing conditions for p?d_sect(). Might be worth double
> checking it actually does what you expect.
Right they are bit different. Surely will check. But if pmd|pud_sect() works
out okay will probably go with it as its been there for sometime.
next prev parent reply other threads:[~2019-04-04 6:51 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-03 4:30 [PATCH 0/6] arm64/mm: Enable memory hot remove and ZONE_DEVICE Anshuman Khandual
2019-04-03 4:30 ` [PATCH 1/6] arm64/mm: Enable sysfs based memory hot add interface Anshuman Khandual
2019-04-03 8:20 ` David Hildenbrand
2019-04-03 13:12 ` Robin Murphy
2019-04-04 5:21 ` Anshuman Khandual
2019-04-04 5:25 ` Anshuman Khandual
2019-04-04 8:49 ` David Hildenbrand
2019-04-03 4:30 ` [PATCH 2/6] arm64/mm: Enable memory hot remove Anshuman Khandual
2019-04-03 12:37 ` Robin Murphy
2019-04-03 13:15 ` Steven Price
2019-04-04 6:51 ` Anshuman Khandual [this message]
2019-04-04 5:39 ` Anshuman Khandual
2019-04-04 11:58 ` Oscar Salvador
2019-04-04 13:03 ` Anshuman Khandual
2019-04-04 15:19 ` Oscar Salvador
2019-04-03 17:32 ` Logan Gunthorpe
2019-04-03 17:57 ` Robin Murphy
2019-04-04 8:23 ` Anshuman Khandual
2019-04-04 7:07 ` Anshuman Khandual
2019-04-04 9:16 ` Steven Price
2019-04-03 4:30 ` [PATCH 3/6] arm64/mm: Enable struct page allocation from device memory Anshuman Khandual
2019-04-03 4:30 ` [PATCH 4/6] mm/hotplug: Reorder arch_remove_memory() call in __remove_memory() Anshuman Khandual
2019-04-03 8:45 ` Oscar Salvador
2019-04-03 9:17 ` Michal Hocko
2019-04-04 8:32 ` Anshuman Khandual
2019-04-03 9:30 ` David Hildenbrand
2019-04-03 4:30 ` [PATCH 5/6] mm/memremap: Rename and consolidate SECTION_SIZE Anshuman Khandual
2019-04-03 9:26 ` Michal Hocko
2019-04-03 9:30 ` David Hildenbrand
2019-04-03 4:30 ` [PATCH 6/6] arm64/mm: Enable ZONE_DEVICE Anshuman Khandual
2019-04-03 13:58 ` Robin Murphy
2019-04-03 16:07 ` Jerome Glisse
2019-04-04 5:03 ` Anshuman Khandual
2019-04-04 4:42 ` Anshuman Khandual
2019-04-04 5:04 ` Dan Williams
2019-04-04 9:46 ` Robin Murphy
2019-04-07 22:11 ` Dan Williams
2019-04-08 4:03 ` Ira Weiny
2019-04-08 6:03 ` Anshuman Khandual
2019-04-03 18:08 ` [PATCH 0/6] arm64/mm: Enable memory hot remove and ZONE_DEVICE Dan Williams
2019-04-04 13:11 ` Anshuman Khandual
2019-04-04 9:46 ` [RFC 1/2] mm/vmemmap: Enable vmem_altmap based base page mapping for vmemmap Anshuman Khandual
2019-04-04 9:46 ` [RFC 2/2] arm64/mm: Enable ZONE_DEVICE for all page configs Anshuman Khandual
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=c52f0adf-5764-19b8-235e-4c37148388aa@arm.com \
--to=anshuman.khandual@arm.com \
--cc=akpm@linux-foundation.org \
--cc=arunks@codeaurora.org \
--cc=cai@lca.pw \
--cc=catalin.marinas@arm.com \
--cc=cpandya@codeaurora.org \
--cc=dan.j.williams@intel.com \
--cc=david@redhat.com \
--cc=james.morse@arm.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=logang@deltatee.com \
--cc=mark.rutland@arm.com \
--cc=mgorman@techsingularity.net \
--cc=mhocko@suse.com \
--cc=osalvador@suse.de \
--cc=pasha.tatashin@oracle.com \
--cc=robin.murphy@arm.com \
--cc=steven.price@arm.com \
--cc=will.deacon@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).