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From: Oscar Salvador <osalvador@suse.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: akpm@linux-foundation.org, Michal Hocko <mhocko@suse.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Logan Gunthorpe <logang@deltatee.com>,
	linux-nvdimm@lists.01.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 01/12] mm/sparsemem: Introduce struct mem_section_usage
Date: Fri, 3 May 2019 09:35:50 +0200	[thread overview]
Message-ID: <20190503073550.GB15740@linux> (raw)
In-Reply-To: <155677652762.2336373.6522945152928524695.stgit@dwillia2-desk3.amr.corp.intel.com>

On Wed, May 01, 2019 at 10:55:27PM -0700, Dan Williams wrote:
> Towards enabling memory hotplug to track partial population of a
> section, introduce 'struct mem_section_usage'.
> 
> A pointer to a 'struct mem_section_usage' instance replaces the existing
> pointer to a 'pageblock_flags' bitmap. Effectively it adds one more
> 'unsigned long' beyond the 'pageblock_flags' (usemap) allocation to
> house a new 'map_active' bitmap.  The new bitmap enables the memory
> hot{plug,remove} implementation to act on incremental sub-divisions of a
> section.
> 
> The primary motivation for this functionality is to support platforms
> that mix "System RAM" and "Persistent Memory" within a single section,
> or multiple PMEM ranges with different mapping lifetimes within a single
> section. The section restriction for hotplug has caused an ongoing saga
> of hacks and bugs for devm_memremap_pages() users.
> 
> Beyond the fixups to teach existing paths how to retrieve the 'usemap'
> from a section, and updates to usemap allocation path, there are no
> expected behavior changes.
> 
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: Logan Gunthorpe <logang@deltatee.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Reviewed-by: Oscar Salvador <osalvador@suse.de>

-- 
Oscar Salvador
SUSE L3

  reply	other threads:[~2019-05-03  7:35 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-02  5:55 [PATCH v7 00/12] mm: Sub-section memory hotplug support Dan Williams
2019-05-02  5:55 ` [PATCH v7 01/12] mm/sparsemem: Introduce struct mem_section_usage Dan Williams
2019-05-03  7:35   ` Oscar Salvador [this message]
2019-05-02  5:55 ` [PATCH v7 02/12] mm/sparsemem: Introduce common definitions for the size and mask of a section Dan Williams
2019-05-03  8:06   ` Oscar Salvador
2019-05-02  5:55 ` [PATCH v7 03/12] mm/sparsemem: Add helpers track active portions of a section at boot Dan Williams
2019-05-02  7:48   ` Oscar Salvador
2019-05-02 14:03     ` Dan Williams
2019-05-03  7:31       ` Oscar Salvador
2019-05-03 19:52   ` Pavel Tatashin
2019-05-02  5:55 ` [PATCH v7 04/12] mm/hotplug: Prepare shrink_{zone, pgdat}_span for sub-section removal Dan Williams
2019-05-02  5:55 ` [PATCH v7 05/12] mm/sparsemem: Convert kmalloc_section_memmap() to populate_section_memmap() Dan Williams
2019-05-03  8:46   ` Oscar Salvador
2019-05-02  5:55 ` [PATCH v7 06/12] mm/hotplug: Kill is_dev_zone() usage in __remove_pages() Dan Williams
2019-05-02 11:27   ` David Hildenbrand
2019-05-03  7:37   ` Oscar Salvador
2019-05-02  5:55 ` [PATCH v7 07/12] mm: Kill is_dev_zone() helper Dan Williams
2019-05-02  5:56 ` [PATCH v7 08/12] mm/sparsemem: Prepare for sub-section ranges Dan Williams
2019-05-03 11:00   ` Oscar Salvador
2019-05-02  5:56 ` [PATCH v7 09/12] mm/sparsemem: Support sub-section hotplug Dan Williams
2019-05-03 12:56   ` Oscar Salvador
2019-06-04  4:17     ` Dan Williams
2019-05-02  5:56 ` [PATCH v7 10/12] mm/devm_memremap_pages: Enable sub-section remap Dan Williams
2019-05-02  5:56 ` [PATCH v7 11/12] libnvdimm/pfn: Fix fsdax-mode namespace info-block zero-fields Dan Williams
2019-05-02  5:56 ` [PATCH v7 12/12] libnvdimm/pfn: Stop padding pmem namespaces to section alignment Dan Williams

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