From: Muchun Song <songmuchun@bytedance.com>
To: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com,
dave.hansen@linux.intel.com, luto@kernel.org,
peterz@infradead.org, viro@zeniv.linux.org.uk,
akpm@linux-foundation.org, paulmck@kernel.org,
mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com,
rdunlap@infradead.org, oneukum@suse.com,
anshuman.khandual@arm.com, jroedel@suse.de,
almasrymina@google.com, rientjes@google.com, willy@infradead.org,
osalvador@suse.de, mhocko@suse.com
Cc: duanxiongchun@bytedance.com, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org,
Muchun Song <songmuchun@bytedance.com>
Subject: [PATCH v3 07/21] mm/bootmem_info: Combine bootmem info and type into page->freelist
Date: Sun, 8 Nov 2020 22:10:59 +0800 [thread overview]
Message-ID: <20201108141113.65450-8-songmuchun@bytedance.com> (raw)
In-Reply-To: <20201108141113.65450-1-songmuchun@bytedance.com>
The page->private shares storage with page->ptl. In the later patch,
we will use the page->ptl. So here we combine bootmem info and type
into page->freelist so that we can do not use page->private.
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
include/linux/bootmem_info.h | 18 ++++++++++++++++--
mm/bootmem_info.c | 12 ++++++------
mm/sparse.c | 4 ++--
3 files changed, 24 insertions(+), 10 deletions(-)
diff --git a/include/linux/bootmem_info.h b/include/linux/bootmem_info.h
index ce9d8c97369d..b5786a8b412e 100644
--- a/include/linux/bootmem_info.h
+++ b/include/linux/bootmem_info.h
@@ -6,7 +6,7 @@
#include <linux/mm.h>
/*
- * Types for free bootmem stored in page->lru.next. These have to be in
+ * Types for free bootmem stored in page->freelist. These have to be in
* some random range in unsigned long space for debugging purposes.
*/
enum {
@@ -17,6 +17,20 @@ enum {
MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
};
+#define BOOTMEM_TYPE_BITS 4
+#define BOOTMEM_TYPE_MAX ((1UL << BOOTMEM_TYPE_BITS) - 1)
+#define BOOTMEM_INFO_MAX (ULONG_MAX >> BOOTMEM_TYPE_BITS)
+
+static inline unsigned long page_bootmem_type(struct page *page)
+{
+ return (unsigned long)page->freelist & BOOTMEM_TYPE_MAX;
+}
+
+static inline unsigned long page_bootmem_info(struct page *page)
+{
+ return (unsigned long)page->freelist >> BOOTMEM_TYPE_BITS;
+}
+
#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
@@ -30,7 +44,7 @@ static inline void free_vmemmap_page(struct page *page)
/* bootmem page has reserved flag in the reserve_bootmem_region */
if (PageReserved(page)) {
- unsigned long magic = (unsigned long)page->freelist;
+ unsigned long magic = page_bootmem_type(page);
if (magic == SECTION_INFO || magic == MIX_SECTION_INFO)
put_page_bootmem(page);
diff --git a/mm/bootmem_info.c b/mm/bootmem_info.c
index fcab5a3f8cc0..9baf163965fd 100644
--- a/mm/bootmem_info.c
+++ b/mm/bootmem_info.c
@@ -12,9 +12,9 @@
void get_page_bootmem(unsigned long info, struct page *page, unsigned long type)
{
- page->freelist = (void *)type;
- SetPagePrivate(page);
- set_page_private(page, info);
+ BUG_ON(info > BOOTMEM_INFO_MAX);
+ BUG_ON(type > BOOTMEM_TYPE_MAX);
+ page->freelist = (void *)((info << BOOTMEM_TYPE_BITS) | type);
page_ref_inc(page);
}
@@ -22,14 +22,12 @@ void put_page_bootmem(struct page *page)
{
unsigned long type;
- type = (unsigned long) page->freelist;
+ type = page_bootmem_type(page);
BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);
if (page_ref_dec_return(page) == 1) {
page->freelist = NULL;
- ClearPagePrivate(page);
- set_page_private(page, 0);
INIT_LIST_HEAD(&page->lru);
free_reserved_page(page);
}
@@ -101,6 +99,8 @@ void __init register_page_bootmem_info_node(struct pglist_data *pgdat)
int node = pgdat->node_id;
struct page *page;
+ BUILD_BUG_ON(MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE > BOOTMEM_TYPE_MAX);
+
nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT;
page = virt_to_page(pgdat);
diff --git a/mm/sparse.c b/mm/sparse.c
index a4138410d890..fca5fa38c2bc 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -740,12 +740,12 @@ static void free_map_bootmem(struct page *memmap)
>> PAGE_SHIFT;
for (i = 0; i < nr_pages; i++, page++) {
- magic = (unsigned long) page->freelist;
+ magic = page_bootmem_type(page);
BUG_ON(magic == NODE_INFO);
maps_section_nr = pfn_to_section_nr(page_to_pfn(page));
- removing_section_nr = page_private(page);
+ removing_section_nr = page_bootmem_info(page);
/*
* When this function is called, the removing section is
--
2.11.0
next prev parent reply other threads:[~2020-11-08 14:12 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-08 14:10 [PATCH v3 00/21] Free some vmemmap pages of hugetlb page Muchun Song
2020-11-08 14:10 ` [PATCH v3 01/21] mm/memory_hotplug: Move bootmem info registration API to bootmem_info.c Muchun Song
2020-11-08 14:10 ` [PATCH v3 02/21] mm/memory_hotplug: Move {get,put}_page_bootmem() " Muchun Song
2020-11-08 14:10 ` [PATCH v3 03/21] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Muchun Song
2020-11-09 13:52 ` Oscar Salvador
2020-11-09 14:20 ` [External] " Muchun Song
2020-11-10 19:31 ` Mike Kravetz
2020-11-10 19:50 ` Matthew Wilcox
2020-11-10 20:30 ` Mike Kravetz
2020-11-17 15:35 ` [External] " Muchun Song
2020-11-11 3:28 ` Muchun Song
2020-11-08 14:10 ` [PATCH v3 04/21] mm/hugetlb: Introduce nr_free_vmemmap_pages in the struct hstate Muchun Song
2020-11-09 16:48 ` Oscar Salvador
2020-11-10 2:42 ` [External] " Muchun Song
2020-11-10 19:38 ` Mike Kravetz
2020-11-11 3:22 ` Muchun Song
2020-11-08 14:10 ` [PATCH v3 05/21] mm/hugetlb: Introduce pgtable allocation/freeing helpers Muchun Song
2020-11-09 17:21 ` Oscar Salvador
2020-11-10 3:49 ` [External] " Muchun Song
2020-11-10 5:42 ` Oscar Salvador
2020-11-10 6:08 ` Muchun Song
2020-11-10 6:33 ` Oscar Salvador
2020-11-10 7:10 ` Muchun Song
2020-11-11 0:47 ` Mike Kravetz
2020-11-11 3:41 ` [External] " Muchun Song
2020-11-13 0:35 ` Mike Kravetz
2020-11-13 1:02 ` Mike Kravetz
2020-11-13 4:18 ` Muchun Song
2020-11-08 14:10 ` [PATCH v3 06/21] mm/bootmem_info: Introduce {free,prepare}_vmemmap_page() Muchun Song
2020-11-08 14:10 ` Muchun Song [this message]
2020-11-08 14:11 ` [PATCH v3 08/21] mm/vmemmap: Initialize page table lock for vmemmap Muchun Song
2020-11-09 18:11 ` Oscar Salvador
2020-11-10 5:17 ` [External] " Muchun Song
2020-11-08 14:11 ` [PATCH v3 09/21] mm/hugetlb: Free the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-09 18:51 ` Oscar Salvador
2020-11-10 6:40 ` [External] " Muchun Song
2020-11-10 9:48 ` Oscar Salvador
2020-11-10 10:47 ` Muchun Song
2020-11-10 13:52 ` Oscar Salvador
2020-11-10 14:00 ` Muchun Song
2020-11-08 14:11 ` [PATCH v3 10/21] mm/hugetlb: Defer freeing of hugetlb pages Muchun Song
2020-11-08 14:11 ` [PATCH v3 11/21] mm/hugetlb: Allocate the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-08 14:11 ` [PATCH v3 12/21] mm/hugetlb: Introduce remap_huge_page_pmd_vmemmap helper Muchun Song
2020-11-08 14:11 ` [PATCH v3 13/21] mm/hugetlb: Use PG_slab to indicate split pmd Muchun Song
2020-11-08 14:11 ` [PATCH v3 14/21] mm/hugetlb: Support freeing vmemmap pages of gigantic page Muchun Song
2020-11-08 14:11 ` [PATCH v3 15/21] mm/hugetlb: Add a BUILD_BUG_ON to check if struct page size is a power of two Muchun Song
2020-11-08 14:11 ` [PATCH v3 16/21] mm/hugetlb: Set the PageHWPoison to the raw error page Muchun Song
2020-11-08 14:11 ` [PATCH v3 17/21] mm/hugetlb: Flush work when dissolving hugetlb page Muchun Song
2020-11-08 14:11 ` [PATCH v3 18/21] mm/hugetlb: Add a kernel parameter hugetlb_free_vmemmap Muchun Song
2020-11-08 14:11 ` [PATCH v3 19/21] mm/hugetlb: Merge pte to huge pmd only for gigantic page Muchun Song
2020-11-08 14:11 ` [PATCH v3 20/21] mm/hugetlb: Gather discrete indexes of tail page Muchun Song
2020-11-08 14:11 ` [PATCH v3 21/21] mm/hugetlb: Add BUILD_BUG_ON to catch invalid usage of tail struct page Muchun Song
2020-11-10 19:23 ` [PATCH v3 00/21] Free some vmemmap pages of hugetlb page Mike Kravetz
2020-11-11 3:21 ` [External] " Muchun Song
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