From: Dan Williams <dan.j.williams@intel.com>
To: akpm@linux-foundation.org
Cc: "Michal Hocko" <mhocko@suse.com>,
jack@suse.cz, linux-nvdimm@lists.01.org,
"Pavel Tatashin" <pasha.tatashin@oracle.com>,
"Daniel Jordan" <daniel.m.jordan@oracle.com>,
linux-mm@kvack.org, "Jérôme Glisse" <jglisse@redhat.com>,
"Christoph Hellwig" <hch@lst.de>,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 03/14] mm: Teach memmap_init_zone() to initialize ZONE_DEVICE pages
Date: Mon, 16 Jul 2018 10:00:37 -0700 [thread overview]
Message-ID: <153176043742.12695.12733023097134464039.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
In-Reply-To: <153176041838.12695.3365448145295112857.stgit@dwillia2-desk3.amr.corp.intel.com>
Rather than run a loop over the freshly initialized pages in
devm_memremap_pages() *after* arch_add_memory() returns, teach
memmap_init_zone() to return the pages fully initialized. This is in
preparation for multi-threading page initialization work, but it also
has some straight line performance benefits to not incur another loop of
cache misses across a large (100s of GBs to TBs) address range.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
kernel/memremap.c | 16 +---------------
mm/page_alloc.c | 19 +++++++++++++++++++
2 files changed, 20 insertions(+), 15 deletions(-)
diff --git a/kernel/memremap.c b/kernel/memremap.c
index b861fe909932..85e4a7c576b2 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -173,8 +173,8 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap,
struct vmem_altmap *altmap = pgmap->altmap_valid ?
&pgmap->altmap : NULL;
struct resource *res = &pgmap->res;
- unsigned long pfn, pgoff, order;
pgprot_t pgprot = PAGE_KERNEL;
+ unsigned long pgoff, order;
int error, nid, is_ram;
if (!pgmap->ref || !kill)
@@ -251,20 +251,6 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap,
if (error)
goto err_add_memory;
- for_each_device_pfn(pfn, pgmap) {
- struct page *page = pfn_to_page(pfn);
-
- /*
- * ZONE_DEVICE pages union ->lru with a ->pgmap back
- * pointer. It is a bug if a ZONE_DEVICE page is ever
- * freed or placed on a driver-private list. Seed the
- * storage with LIST_POISON* values.
- */
- list_del(&page->lru);
- page->pgmap = pgmap;
- percpu_ref_get(pgmap->ref);
- }
-
pgmap->kill = kill;
error = devm_add_action_or_reset(dev, devm_memremap_pages_release,
pgmap);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f83682ef006e..fb45cfeb4a50 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5548,6 +5548,25 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
set_pageblock_migratetype(page, MIGRATE_MOVABLE);
cond_resched();
}
+
+ if (is_zone_device_page(page)) {
+ if (WARN_ON_ONCE(!pgmap))
+ continue;
+
+ /* skip invalid device pages */
+ if (altmap && (pfn < (altmap->base_pfn
+ + vmem_altmap_offset(altmap))))
+ continue;
+ /*
+ * ZONE_DEVICE pages union ->lru with a ->pgmap back
+ * pointer. It is a bug if a ZONE_DEVICE page is ever
+ * freed or placed on a driver-private list. Seed the
+ * storage with poison.
+ */
+ page->lru.prev = LIST_POISON2;
+ page->pgmap = pgmap;
+ percpu_ref_get(pgmap->ref);
+ }
}
}
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next prev parent reply other threads:[~2018-07-16 17:13 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-16 17:00 [PATCH v2 00/14] mm: Asynchronous + multithreaded memmap init for ZONE_DEVICE Dan Williams
2018-07-16 17:00 ` [PATCH v2 01/14] mm: Plumb dev_pagemap instead of vmem_altmap to memmap_init_zone() Dan Williams
2018-07-16 17:00 ` [PATCH v2 02/14] mm: Enable asynchronous __add_pages() and vmemmap_populate_hugepages() Dan Williams
2018-07-16 17:00 ` Dan Williams [this message]
2018-07-16 17:00 ` [PATCH v2 04/14] mm: Multithread ZONE_DEVICE initialization Dan Williams
2018-07-16 17:00 ` [PATCH v2 05/14] mm, memremap: Up-level foreach_order_pgoff() Dan Williams
2018-07-16 21:00 ` Matthew Wilcox
2018-07-16 17:00 ` [PATCH v2 06/14] mm: Allow an external agent to coordinate memmap initialization Dan Williams
2018-07-16 17:00 ` [PATCH v2 07/14] libnvdimm, pmem: Allow a NULL-pfn to ->direct_access() Dan Williams
2018-07-16 17:01 ` [PATCH v2 08/14] tools/testing/nvdimm: " Dan Williams
2018-07-16 17:01 ` [PATCH v2 09/14] s390, dcssblk: " Dan Williams
2018-07-16 17:01 ` [PATCH v2 10/14] filesystem-dax: Do not request a pfn when not required Dan Williams
2018-07-16 17:01 ` [PATCH v2 11/14] filesystem-dax: Make mount time pfn validation a debug check Dan Williams
2018-07-16 17:01 ` [PATCH v2 12/14] libnvdimm, pmem: Initialize the memmap in the background Dan Williams
2018-07-16 17:01 ` [PATCH v2 13/14] device-dax: " Dan Williams
2018-07-16 17:01 ` [PATCH v2 14/14] libnvdimm, namespace: Publish page structure init state / control Dan Williams
2018-07-16 19:12 ` [PATCH v2 00/14] mm: Asynchronous + multithreaded memmap init for ZONE_DEVICE Pavel Tatashin
2018-07-16 20:30 ` Dan Williams
2018-07-17 14:46 ` Pavel Tatashin
2018-07-17 15:50 ` Michal Hocko
2018-07-17 17:32 ` Dan Williams
2018-07-18 12:05 ` Michal Hocko
2018-07-19 18:41 ` Dave Hansen
2018-07-23 11:09 ` Michal Hocko
2018-07-23 16:15 ` Dave Hansen
2018-07-24 7:29 ` Michal Hocko
2018-09-10 19:06 ` Dan Williams
2018-09-10 19:47 ` Alexander Duyck
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