[PATCH] mm: copy_one_pte inc rss
Small adjustment, following Nick's suggestion: it's more straightforward for
copy_pte_range to let copy_one_pte do the rss incrementation, than use an
index it passed back. Saves a #define, and 16 bytes of .text.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/memory.c b/mm/memory.c
index e83f944..7893eb4 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -340,8 +340,6 @@
add_mm_counter(mm, anon_rss, anon_rss);
}
-#define NO_RSS 2 /* Increment neither file_rss nor anon_rss */
-
/*
* This function is called to print an error when a pte in a
* !VM_RESERVED region is found pointing to an invalid pfn (which
@@ -368,16 +366,15 @@
* but may be dropped within p[mg]d_alloc() and pte_alloc_map().
*/
-static inline int
+static inline void
copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
pte_t *dst_pte, pte_t *src_pte, struct vm_area_struct *vma,
- unsigned long addr)
+ unsigned long addr, int *rss)
{
unsigned long vm_flags = vma->vm_flags;
pte_t pte = *src_pte;
struct page *page;
unsigned long pfn;
- int anon = NO_RSS;
/* pte contains position in swap or file, so copy. */
if (unlikely(!pte_present(pte))) {
@@ -428,11 +425,10 @@
pte = pte_mkold(pte);
get_page(page);
page_dup_rmap(page);
- anon = !!PageAnon(page);
+ rss[!!PageAnon(page)]++;
out_set_pte:
set_pte_at(dst_mm, addr, dst_pte, pte);
- return anon;
}
static int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
@@ -441,7 +437,7 @@
{
pte_t *src_pte, *dst_pte;
int progress = 0;
- int rss[NO_RSS+1], anon;
+ int rss[2];
again:
rss[1] = rss[0] = 0;
@@ -467,8 +463,7 @@
progress++;
continue;
}
- anon = copy_one_pte(dst_mm, src_mm, dst_pte, src_pte, vma,addr);
- rss[anon]++;
+ copy_one_pte(dst_mm, src_mm, dst_pte, src_pte, vma, addr, rss);
progress += 8;
} while (dst_pte++, src_pte++, addr += PAGE_SIZE, addr != end);
spin_unlock(&src_mm->page_table_lock);