From: Oscar Salvador <osalvador@suse.de>
To: akpm@linux-foundation.org
Cc: mhocko@suse.com, dan.j.williams@intel.com,
pasha.tatashin@soleen.com, Jonathan.Cameron@huawei.com,
david@redhat.com, anshuman.khandual@arm.com, vbabka@suse.cz,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Oscar Salvador <osalvador@suse.de>
Subject: [PATCH v2 3/5] mm,memory_hotplug: Introduce Vmemmap page helpers
Date: Tue, 25 Jun 2019 09:52:25 +0200 [thread overview]
Message-ID: <20190625075227.15193-4-osalvador@suse.de> (raw)
In-Reply-To: <20190625075227.15193-1-osalvador@suse.de>
Introduce a set of functions for Vmemmap pages.
Set of functions:
- {Set,Clear,Check} Vmemmap flag
- Given a vmemmap page, get its vmemmap-head
- Get #nr of vmemmap pages taking into account the current position
of the page
These functions will be used for the code handling Vmemmap pages.
Signed-off-by: Oscar Salvador <osalvador@suse.de>
---
include/linux/page-flags.h | 34 ++++++++++++++++++++++++++++++++++
mm/util.c | 2 ++
2 files changed, 36 insertions(+)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index b848517da64c..a8b9b57162b3 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -466,6 +466,40 @@ static __always_inline int __PageMovable(struct page *page)
PAGE_MAPPING_MOVABLE;
}
+#define VMEMMAP_PAGE (~PAGE_MAPPING_FLAGS)
+static __always_inline int PageVmemmap(struct page *page)
+{
+ return PageReserved(page) && (unsigned long)page->mapping == VMEMMAP_PAGE;
+}
+
+static __always_inline int __PageVmemmap(struct page *page)
+{
+ return (unsigned long)page->mapping == VMEMMAP_PAGE;
+}
+
+static __always_inline void __ClearPageVmemmap(struct page *page)
+{
+ __ClearPageReserved(page);
+ page->mapping = NULL;
+}
+
+static __always_inline void __SetPageVmemmap(struct page *page)
+{
+ __SetPageReserved(page);
+ page->mapping = (void *)VMEMMAP_PAGE;
+}
+
+static __always_inline struct page *vmemmap_get_head(struct page *page)
+{
+ return (struct page *)page->freelist;
+}
+
+static __always_inline unsigned long get_nr_vmemmap_pages(struct page *page)
+{
+ struct page *head = vmemmap_get_head(page);
+ return head->private - (page - head);
+}
+
#ifdef CONFIG_KSM
/*
* A KSM page is one of those write-protected "shared pages" or "merged pages"
diff --git a/mm/util.c b/mm/util.c
index 021648a8a3a3..5e20563cdef6 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -607,6 +607,8 @@ struct address_space *page_mapping(struct page *page)
mapping = page->mapping;
if ((unsigned long)mapping & PAGE_MAPPING_ANON)
return NULL;
+ if ((unsigned long)mapping == VMEMMAP_PAGE)
+ return NULL;
return (void *)((unsigned long)mapping & ~PAGE_MAPPING_FLAGS);
}
--
2.12.3
next prev parent reply other threads:[~2019-06-25 7:53 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-25 7:52 [PATCH v2 0/5] Allocate memmap from hotadded memory Oscar Salvador
2019-06-25 7:52 ` [PATCH v2 1/5] drivers/base/memory: Remove unneeded check in remove_memory_block_devices Oscar Salvador
2019-06-25 8:01 ` David Hildenbrand
2019-06-25 8:03 ` David Hildenbrand
2019-06-25 8:09 ` Oscar Salvador
2019-06-25 8:27 ` David Hildenbrand
2019-06-25 7:52 ` [PATCH v2 2/5] mm,memory_hotplug: Introduce MHP_VMEMMAP_FLAGS Oscar Salvador
2019-06-25 8:31 ` David Hildenbrand
2019-07-24 20:11 ` Dan Williams
2019-07-24 21:36 ` osalvador
2019-07-25 9:27 ` Oscar Salvador
2019-07-25 9:30 ` David Hildenbrand
2019-07-25 9:40 ` Oscar Salvador
2019-07-25 10:04 ` David Hildenbrand
2019-07-25 10:13 ` Oscar Salvador
2019-07-25 10:15 ` David Hildenbrand
2019-06-25 7:52 ` Oscar Salvador [this message]
2019-06-25 10:28 ` [PATCH v2 3/5] mm,memory_hotplug: Introduce Vmemmap page helpers David Hildenbrand
2019-06-26 9:48 ` Oscar Salvador
2019-06-25 7:52 ` [PATCH v2 4/5] mm,memory_hotplug: allocate memmap from the added memory range for sparse-vmemmap Oscar Salvador
2019-06-25 8:49 ` David Hildenbrand
2019-06-26 8:13 ` Oscar Salvador
2019-06-26 8:15 ` David Hildenbrand
2019-06-26 8:17 ` Anshuman Khandual
2019-06-26 8:28 ` Oscar Salvador
2019-07-24 21:49 ` Dan Williams
2019-06-25 7:52 ` [PATCH v2 5/5] mm,memory_hotplug: Allow userspace to enable/disable vmemmap Oscar Salvador
2019-06-25 8:25 ` [PATCH v2 0/5] Allocate memmap from hotadded memory David Hildenbrand
2019-06-25 8:33 ` David Hildenbrand
2019-06-26 8:03 ` Oscar Salvador
2019-06-26 8:11 ` David Hildenbrand
2019-06-26 8:15 ` Oscar Salvador
2019-06-26 8:27 ` Oscar Salvador
2019-06-26 8:37 ` David Hildenbrand
2019-06-26 8:28 ` David Hildenbrand
2019-07-02 6:42 ` Rashmica Gupta
2019-07-02 7:48 ` Oscar Salvador
2019-07-02 8:52 ` Rashmica Gupta
2019-07-10 1:14 ` Rashmica Gupta
2019-07-31 12:08 ` Michal Hocko
2019-07-31 23:06 ` Rashmica Gupta
2019-08-01 7:17 ` Michal Hocko
2019-08-01 7:18 ` David Hildenbrand
2019-08-01 7:24 ` Michal Hocko
2019-08-01 7:26 ` David Hildenbrand
2019-08-01 7:31 ` David Hildenbrand
2019-08-01 7:39 ` Michal Hocko
2019-08-01 7:48 ` Michal Hocko
2019-08-01 9:18 ` David Hildenbrand
2019-08-01 7:34 ` Michal Hocko
2019-08-01 7:50 ` David Hildenbrand
2019-08-01 8:04 ` Michal Hocko
2019-07-16 12:28 ` David Hildenbrand
2019-07-29 5:42 ` Rashmica Gupta
2019-07-29 8:06 ` David Hildenbrand
2019-07-30 7:08 ` Rashmica Gupta
2019-07-31 2:21 ` Rashmica Gupta
2019-07-31 9:39 ` David Hildenbrand
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