All of lore.kernel.org
 help / color / mirror / Atom feed
From: Oscar Salvador <osalvador@suse.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Michal Hocko <mhocko@suse.com>,
	Pavel Tatashin <pasha.tatashin@soleen.com>,
	linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, akpm@linux-foundation.org,
	Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH v9 02/12] mm/sparsemem: Add helpers track active portions of a section at boot
Date: Thu, 6 Jun 2019 18:55:42 +0200	[thread overview]
Message-ID: <20190606165535.GA31194@linux> (raw)
In-Reply-To: <155977187919.2443951.8925592545929008845.stgit@dwillia2-desk3.amr.corp.intel.com>

On Wed, Jun 05, 2019 at 02:57:59PM -0700, Dan Williams wrote:
> Prepare for hot{plug,remove} of sub-ranges of a section by tracking a
> sub-section active bitmask, each bit representing a PMD_SIZE span of the
> architecture's memory hotplug section size.
> 
> The implications of a partially populated section is that pfn_valid()
> needs to go beyond a valid_section() check and read the sub-section
> active ranges from the bitmask. The expectation is that the bitmask
> (subsection_map) fits in the same cacheline as the valid_section() data,
> so the incremental performance overhead to pfn_valid() should be
> negligible.
> 
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: Logan Gunthorpe <logang@deltatee.com>
> Cc: Oscar Salvador <osalvador@suse.de>
> Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
> Tested-by: Jane Chu <jane.chu@oracle.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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

-- 
Oscar Salvador
SUSE L3
_______________________________________________
Linux-nvdimm mailing list
Linux-nvdimm@lists.01.org
https://lists.01.org/mailman/listinfo/linux-nvdimm

WARNING: multiple messages have this Message-ID (diff)
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>,
	Pavel Tatashin <pasha.tatashin@soleen.com>,
	Jane Chu <jane.chu@oracle.com>,
	linux-mm@kvack.org, linux-nvdimm@lists.01.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v9 02/12] mm/sparsemem: Add helpers track active portions of a section at boot
Date: Thu, 6 Jun 2019 18:55:42 +0200	[thread overview]
Message-ID: <20190606165535.GA31194@linux> (raw)
In-Reply-To: <155977187919.2443951.8925592545929008845.stgit@dwillia2-desk3.amr.corp.intel.com>

On Wed, Jun 05, 2019 at 02:57:59PM -0700, Dan Williams wrote:
> Prepare for hot{plug,remove} of sub-ranges of a section by tracking a
> sub-section active bitmask, each bit representing a PMD_SIZE span of the
> architecture's memory hotplug section size.
> 
> The implications of a partially populated section is that pfn_valid()
> needs to go beyond a valid_section() check and read the sub-section
> active ranges from the bitmask. The expectation is that the bitmask
> (subsection_map) fits in the same cacheline as the valid_section() data,
> so the incremental performance overhead to pfn_valid() should be
> negligible.
> 
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: Logan Gunthorpe <logang@deltatee.com>
> Cc: Oscar Salvador <osalvador@suse.de>
> Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
> Tested-by: Jane Chu <jane.chu@oracle.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:[~2019-06-06 16:55 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-05 21:57 [PATCH v9 00/12] mm: Sub-section memory hotplug support Dan Williams
2019-06-05 21:57 ` Dan Williams
2019-06-05 21:57 ` [PATCH v9 01/12] mm/sparsemem: Introduce struct mem_section_usage Dan Williams
2019-06-05 21:57   ` Dan Williams
2019-06-06 17:34   ` Oscar Salvador
2019-06-06 17:34     ` Oscar Salvador
2019-06-16 13:11   ` Wei Yang
2019-06-16 13:11     ` Wei Yang
2019-06-18 21:56     ` Dan Williams
2019-06-18 21:56       ` Dan Williams
2019-06-19  2:13       ` Wei Yang
2019-06-19  2:13         ` Wei Yang
2019-06-05 21:57 ` [PATCH v9 02/12] mm/sparsemem: Add helpers track active portions of a section at boot Dan Williams
2019-06-05 21:57   ` Dan Williams
2019-06-06 16:55   ` Oscar Salvador [this message]
2019-06-06 16:55     ` Oscar Salvador
2019-06-17 22:21   ` Wei Yang
2019-06-17 22:21     ` Wei Yang
2019-06-17 22:32     ` Dan Williams
2019-06-17 22:32       ` Dan Williams
2019-06-18  1:03       ` Wei Yang
2019-06-18  1:03         ` Wei Yang
2019-06-19  3:15       ` Dan Williams
2019-06-05 21:58 ` [PATCH v9 03/12] mm/hotplug: Prepare shrink_{zone, pgdat}_span for sub-section removal Dan Williams
2019-06-05 21:58   ` Dan Williams
2019-06-18  1:42   ` Wei Yang
2019-06-18  1:42     ` Wei Yang
2019-06-19  3:40     ` Dan Williams
2019-06-05 21:58 ` [PATCH v9 04/12] mm/sparsemem: Convert kmalloc_section_memmap() to populate_section_memmap() Dan Williams
2019-06-05 21:58   ` Dan Williams
2019-06-06 17:02   ` Oscar Salvador
2019-06-06 17:02     ` Oscar Salvador
2019-06-16  6:06   ` Aneesh Kumar K.V
2019-06-16  6:06     ` Aneesh Kumar K.V
2019-06-05 21:58 ` [PATCH v9 05/12] mm/hotplug: Kill is_dev_zone() usage in __remove_pages() Dan Williams
2019-06-05 21:58   ` Dan Williams
2019-06-05 21:58 ` [PATCH v9 06/12] mm: Kill is_dev_zone() helper Dan Williams
2019-06-05 21:58   ` Dan Williams
2019-06-18  3:35   ` Wei Yang
2019-06-18  3:35     ` Wei Yang
2019-06-05 21:58 ` [PATCH v9 07/12] mm/sparsemem: Prepare for sub-section ranges Dan Williams
2019-06-05 21:58   ` Dan Williams
2019-06-06 17:21   ` Oscar Salvador
2019-06-06 17:21     ` Oscar Salvador
2019-06-06 18:16     ` Dan Williams
2019-06-06 18:16       ` Dan Williams
2019-06-14  8:39   ` David Hildenbrand
2019-06-14  8:39     ` David Hildenbrand
2019-06-05 21:58 ` [PATCH v9 08/12] mm/sparsemem: Support sub-section hotplug Dan Williams
2019-06-05 21:58   ` Dan Williams
2019-06-07  8:33   ` Oscar Salvador
2019-06-07 15:38     ` Dan Williams
2019-06-07 15:38       ` Dan Williams
2019-06-07 21:41       ` Oscar Salvador
2019-06-05 21:58 ` [PATCH v9 09/12] mm: Document ZONE_DEVICE memory-model implications Dan Williams
2019-06-05 21:58   ` Dan Williams
2019-06-05 21:58 ` [PATCH v9 10/12] mm/devm_memremap_pages: Enable sub-section remap Dan Williams
2019-06-05 21:58   ` Dan Williams
2019-06-07  8:56   ` Oscar Salvador
2019-06-07  8:56     ` Oscar Salvador
2019-06-16  7:49   ` Aneesh Kumar K.V
2019-06-05 21:58 ` [PATCH v9 11/12] libnvdimm/pfn: Fix fsdax-mode namespace info-block zero-fields Dan Williams
2019-06-05 21:58   ` Dan Williams
2019-06-06 21:46   ` Andrew Morton
2019-06-06 21:46     ` Andrew Morton
2019-06-06 22:06     ` Dan Williams
2019-06-06 22:06       ` Dan Williams
2019-06-07 19:54       ` Andrew Morton
2019-06-07 20:09         ` Dan Williams
2019-06-12  9:41   ` Aneesh Kumar K.V
2019-06-05 21:59 ` [PATCH v9 12/12] libnvdimm/pfn: Stop padding pmem namespaces to section alignment Dan Williams
2019-06-05 21:59   ` Dan Williams

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190606165535.GA31194@linux \
    --to=osalvador@suse.de \
    --cc=akpm@linux-foundation.org \
    --cc=dan.j.williams@intel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=linux-nvdimm@lists.01.org \
    --cc=mhocko@suse.com \
    --cc=pasha.tatashin@soleen.com \
    --cc=vbabka@suse.cz \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.