From: David Hildenbrand <david@redhat.com>
To: Mike Rapoport <rppt@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
Anshuman Khandual <anshuman.khandual@arm.com>,
Ard Biesheuvel <ardb@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Marc Zyngier <maz@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Mike Rapoport <rppt@linux.ibm.com>, Will Deacon <will@kernel.org>,
kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH v1 2/4] memblock: update initialization of reserved pages
Date: Tue, 20 Apr 2021 17:18:55 +0200 [thread overview]
Message-ID: <45a7e13d-3e44-3b94-a253-2df72649a83d@redhat.com> (raw)
In-Reply-To: <YH7tL77Z9UzTAFca@kernel.org>
On 20.04.21 17:03, Mike Rapoport wrote:
> On Tue, Apr 20, 2021 at 03:56:28PM +0200, David Hildenbrand wrote:
>> On 20.04.21 11:09, Mike Rapoport wrote:
>>> From: Mike Rapoport <rppt@linux.ibm.com>
>>>
>>> The struct pages representing a reserved memory region are initialized
>>> using reserve_bootmem_range() function. This function is called for each
>>> reserved region just before the memory is freed from memblock to the buddy
>>> page allocator.
>>>
>>> The struct pages for MEMBLOCK_NOMAP regions are kept with the default
>>> values set by the memory map initialization which makes it necessary to
>>> have a special treatment for such pages in pfn_valid() and
>>> pfn_valid_within().
>>
>> Just a general question while thinking about it:
>>
>> Would we right now initialize the memmap of these pages already via
>> memmap_init_zone()->memmap_init_range()? (IOW, not marking the
>> PageReserved?)
>
> Yep. These pages are part of memblock.memory so they are initialized in
> memmap_init_zone()->memmap_init_range() to the default values.
>
So instead of fully initializing them again, we mostly would only have
to set PageReserved(). Not sure how big that memory usually is -- IOW,
if we really care about optimizing the double-init.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-04-20 15:19 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-20 9:09 [PATCH v1 0/4] arm64: drop pfn_valid_within() and simplify pfn_valid() Mike Rapoport
2021-04-20 9:09 ` [PATCH v1 1/4] include/linux/mmzone.h: add documentation for pfn_valid() Mike Rapoport
2021-04-20 9:22 ` David Hildenbrand
2021-04-20 12:57 ` Mike Rapoport
2021-04-20 12:58 ` David Hildenbrand
2021-04-20 9:09 ` [PATCH v1 2/4] memblock: update initialization of reserved pages Mike Rapoport
2021-04-20 13:56 ` David Hildenbrand
2021-04-20 15:03 ` Mike Rapoport
2021-04-20 15:18 ` David Hildenbrand [this message]
2021-04-20 15:25 ` Mike Rapoport
2021-04-20 9:09 ` [PATCH v1 3/4] arm64: decouple check whether pfn is in linear map from pfn_valid() Mike Rapoport
2021-04-20 15:57 ` David Hildenbrand
2021-04-21 5:32 ` Mike Rapoport
2021-04-20 9:09 ` [PATCH v1 4/4] arm64: drop pfn_valid_within() and simplify pfn_valid() Mike Rapoport
2021-04-20 16:00 ` David Hildenbrand
2021-04-21 5:52 ` Mike Rapoport
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