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From: Dan Williams <dan.j.williams@intel.com>
To: Keith Busch <kbusch@kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>, Keith Busch <keith.busch@intel.com>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	Vishal L Verma <vishal.l.verma@intel.com>,
	X86 ML <x86@kernel.org>, Linux MM <linux-mm@kvack.org>,
	linux-nvdimm <linux-nvdimm@lists.01.org>
Subject: Re: [RFC PATCH 3/5] acpi/hmat: Track target address ranges
Date: Thu, 4 Apr 2019 13:58:12 -0700
Message-ID: <CAPcyv4jua8GeyL7jNOZoEf9MhNXADvQX2T+h1D5FRRd9GLwNeA@mail.gmail.com> (raw)
In-Reply-To: <20190404205818.GC24499@localhost.localdomain>

On Thu, Apr 4, 2019 at 1:56 PM Keith Busch <kbusch@kernel.org> wrote:
>
> On Thu, Apr 04, 2019 at 12:08:44PM -0700, Dan Williams wrote:
> > As of ACPI 6.3 the HMAT no longer advertises the physical memory address
> > range for its entries. Instead, the expectation is the corresponding
> > entry in the SRAT is looked up by the target proximity domain.
> >
> > Given there may be multiple distinct address ranges that share the same
> > performance profile (sparse address space), find_mem_target() is updated
> > to also consider the start address of the memory range. Target property
> > updates are also adjusted to loop over all possible 'struct target'
> > instances that may share the same proximity domain identification.
>
> Since this may allocate multiple targets with the same PXM,
> hmat_register_targets() will attempt to register the same node multiple
> times.
>
> Would it make sense if the existing struct memory_target adds a resource
> list that we can append to as we parse SRAT? That way we have one target
> per memory node, and also track the ranges.

That sounds reasonable to me.

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-04 19:08 [RFC PATCH 0/5] EFI Special Purpose Memory Support Dan Williams
2019-04-04 19:08 ` [RFC PATCH 1/5] efi: Detect UEFI 2.8 Special Purpose Memory Dan Williams
2019-04-06  4:21   ` Ard Biesheuvel
2019-04-09 16:43     ` Dan Williams
2019-04-09 17:21       ` Ard Biesheuvel
2019-04-10  2:10         ` Dan Williams
2019-04-12 20:43           ` Ard Biesheuvel
2019-04-12 21:18             ` Dan Williams
2019-04-15 11:43       ` Enrico Weigelt, metux IT consult
2019-04-04 19:08 ` [RFC PATCH 2/5] lib/memregion: Uplevel the pmem "region" ida to a global allocator Dan Williams
2019-04-04 19:32   ` Matthew Wilcox
2019-04-04 21:02     ` Dan Williams
2019-04-04 19:08 ` [RFC PATCH 3/5] acpi/hmat: Track target address ranges Dan Williams
2019-04-04 20:58   ` Keith Busch
2019-04-04 20:58     ` Dan Williams [this message]
2019-04-04 19:08 ` [RFC PATCH 4/5] acpi/hmat: Register special purpose memory as a device Dan Williams
2019-04-05 11:18   ` Jonathan Cameron
2019-04-05 15:43     ` Dan Williams
2019-04-05 16:23       ` Jonathan Cameron
2019-04-05 16:56         ` Dan Williams
2019-04-05 17:39           ` Jonathan Cameron
2019-04-09 12:13   ` Christoph Hellwig
2019-04-09 14:49     ` Dan Williams
2019-04-04 19:08 ` [RFC PATCH 5/5] device-dax: Add a driver for "hmem" devices Dan Williams

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