Subject: [merged] mm-add-debugfs-tunable-for-fault_around_order.patch removed from -mm tree
To: kirill.shutemov@xxxxxxxxxxxxxxx,ak@xxxxxxxxxxxxxxx,dave.hansen@xxxxxxxxxxxxxxx,david@xxxxxxxxxxxxx,matthew.r.wilcox@xxxxxxxxx,mgorman@xxxxxxx,quning@xxxxxxxxx,riel@xxxxxxxxxx,torvalds@xxxxxxxxxxxxxxxxxxxx,viro@xxxxxxxxxxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Tue, 08 Apr 2014 13:42:51 -0700
The patch titled
Subject: mm: add debugfs tunable for fault_around_order
has been removed from the -mm tree. Its filename was
mm-add-debugfs-tunable-for-fault_around_order.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: mm: add debugfs tunable for fault_around_order
Let's allow people to tweak faultaround at runtime.
[akpm@xxxxxxxxxxxxxxxxxxxx: coding-style fixes]
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Ning Qu <quning@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 68 ++++++++++++++++++++++++++++++++++++++++++++------
1 file changed, 61 insertions(+), 7 deletions(-)
diff -puN mm/memory.c~mm-add-debugfs-tunable-for-fault_around_order mm/memory.c
--- a/mm/memory.c~mm-add-debugfs-tunable-for-fault_around_order
+++ a/mm/memory.c
@@ -60,6 +60,7 @@
#include <linux/migrate.h>
#include <linux/string.h>
#include <linux/dma-debug.h>
+#include <linux/debugfs.h>
#include <asm/io.h>
#include <asm/pgalloc.h>
@@ -3382,8 +3383,63 @@ void do_set_pte(struct vm_area_struct *v
}
#define FAULT_AROUND_ORDER 4
-#define FAULT_AROUND_PAGES (1UL << FAULT_AROUND_ORDER)
-#define FAULT_AROUND_MASK ~((1UL << (PAGE_SHIFT + FAULT_AROUND_ORDER)) - 1)
+
+#ifdef CONFIG_DEBUG_FS
+static unsigned int fault_around_order = FAULT_AROUND_ORDER;
+
+static int fault_around_order_get(void *data, u64 *val)
+{
+ *val = fault_around_order;
+ return 0;
+}
+
+static int fault_around_order_set(void *data, u64 val)
+{
+ BUILD_BUG_ON((1UL << FAULT_AROUND_ORDER) > PTRS_PER_PTE);
+ if (1UL << val > PTRS_PER_PTE)
+ return -EINVAL;
+ fault_around_order = val;
+ return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(fault_around_order_fops,
+ fault_around_order_get, fault_around_order_set, "%llu\n");
+
+static int __init fault_around_debugfs(void)
+{
+ void *ret;
+
+ ret = debugfs_create_file("fault_around_order", 0644, NULL, NULL,
+ &fault_around_order_fops);
+ if (!ret)
+ pr_warn("Failed to create fault_around_order in debugfs");
+ return 0;
+}
+late_initcall(fault_around_debugfs);
+
+static inline unsigned long fault_around_pages(void)
+{
+ return 1UL << fault_around_order;
+}
+
+static inline unsigned long fault_around_mask(void)
+{
+ return ~((1UL << (PAGE_SHIFT + fault_around_order)) - 1);
+}
+#else
+static inline unsigned long fault_around_pages(void)
+{
+ unsigned long nr_pages;
+
+ nr_pages = 1UL << FAULT_AROUND_ORDER;
+ BUILD_BUG_ON(nr_pages > PTRS_PER_PTE);
+ return nr_pages;
+}
+
+static inline unsigned long fault_around_mask(void)
+{
+ return ~((1UL << (PAGE_SHIFT + FAULT_AROUND_ORDER)) - 1);
+}
+#endif
static void do_fault_around(struct vm_area_struct *vma, unsigned long address,
pte_t *pte, pgoff_t pgoff, unsigned int flags)
@@ -3393,21 +3449,19 @@ static void do_fault_around(struct vm_ar
struct vm_fault vmf;
int off;
- BUILD_BUG_ON(FAULT_AROUND_PAGES > PTRS_PER_PTE);
-
- start_addr = max(address & FAULT_AROUND_MASK, vma->vm_start);
+ start_addr = max(address & fault_around_mask(), vma->vm_start);
off = ((address - start_addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
pte -= off;
pgoff -= off;
/*
* max_pgoff is either end of page table or end of vma
- * or FAULT_AROUND_PAGES from pgoff, depending what is neast.
+ * or fault_around_pages() from pgoff, depending what is neast.
*/
max_pgoff = pgoff - ((start_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +
PTRS_PER_PTE - 1;
max_pgoff = min3(max_pgoff, vma_pages(vma) + vma->vm_pgoff - 1,
- pgoff + FAULT_AROUND_PAGES - 1);
+ pgoff + fault_around_pages() - 1);
/* Check if it makes any sense to call ->map_pages */
while (!pte_none(*pte)) {
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
origin.patch
pagewalk-update-page-table-walker-core.patch
pagewalk-add-walk_page_vma.patch
smaps-redefine-callback-functions-for-page-table-walker.patch
clear_refs-redefine-callback-functions-for-page-table-walker.patch
pagemap-redefine-callback-functions-for-page-table-walker.patch
numa_maps-redefine-callback-functions-for-page-table-walker.patch
memcg-redefine-callback-functions-for-page-table-walker.patch
arch-powerpc-mm-subpage-protc-use-walk_page_vma-instead-of-walk_page_range.patch
pagewalk-remove-argument-hmask-from-hugetlb_entry.patch
mempolicy-apply-page-table-walker-on-queue_pages_range.patch
mm-introduce-do_shared_fault-and-drop-do_fault-fix-fix.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
