From: Andrew Morton <akpm@linux-foundation.org>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: David Hildenbrand <david@redhat.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Yang Shi <shy828301@gmail.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Yu Zhao <yuzhao@google.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Hugh Dickins <hughd@google.com>,
Matthew Wilcox <willy@infradead.org>,
Vlastimil Babka <vbabka@suse.cz>, Zi Yan <ziy@nvidia.com>,
"Huang, Ying" <ying.huang@intel.com>,
Ryan Roberts <ryan.roberts@arm.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
John Hubbard <jhubbard@nvidia.com>,
David Rientjes <rientjes@google.com>,
Itaru Kitayama <itaru.kitayama@gmail.com>,
linux-arm-kernel@lists.infradead.org,
Yin Fengwei <fengwei.yin@intel.com>,
Luis Chamberlain <mcgrof@kernel.org>,
linuxppc-dev@lists.ozlabs.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH v6 4/9] mm: thp: Introduce anon_orders and anon_always_mask sysfs files
Date: Mon, 9 Oct 2023 17:20:29 -0700 [thread overview]
Message-ID: <20231009172029.e558c08dd90d9b94fec3a036@linux-foundation.org> (raw)
In-Reply-To: <87fs2mrqld.fsf@mail.lhotse>
On Sun, 08 Oct 2023 09:54:22 +1100 Michael Ellerman <mpe@ellerman.id.au> wrote:
> > I don't know why powerpc's PTE_INDEX_SIZE is variable.
>
> To allow a single vmlinux to boot using either the Hashed Page Table
> MMU, or Radix Tree MMU, which have different page table geometry.
>
> That's a pretty crucial feature for distros, so that they can build a
> single kernel to boot on Power8/9/10.
Dumb question: why can't distros ship two kernels and have the boot
loader (or something else) pick the appropriate one?
next prev parent reply other threads:[~2023-10-10 0:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230929114421.3761121-1-ryan.roberts@arm.com>
[not found] ` <20230929114421.3761121-5-ryan.roberts@arm.com>
2023-09-29 22:55 ` [PATCH v6 4/9] mm: thp: Introduce anon_orders and anon_always_mask sysfs files Andrew Morton
2023-10-02 10:15 ` Ryan Roberts
2023-10-07 22:54 ` Michael Ellerman
2023-10-10 0:20 ` Andrew Morton [this message]
2023-10-12 9:31 ` David Hildenbrand
2023-10-12 11:07 ` Michael Ellerman
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