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From: Keith Busch <kbusch@kernel.org>
To: Dan Williams <dan.j.williams@intel.com>
Cc: 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@intel.com, x86@kernel.org, linux-mm@kvack.org,
	linux-nvdimm@lists.01.org
Subject: Re: [RFC PATCH 3/5] acpi/hmat: Track target address ranges
Date: Thu, 4 Apr 2019 14:58:18 -0600
Message-ID: <20190404205818.GC24499@localhost.localdomain> (raw)
In-Reply-To: <155440492414.3190322.12683374224345847860.stgit@dwillia2-desk3.amr.corp.intel.com>

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.

  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 [this message]
2019-04-04 20:58     ` Dan Williams
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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