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[PATCH] mm: rss = file_rss + anon_rss

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I was lazy when we added anon_rss, and chose to change as few places as
possible.  So currently each anonymous page has to be counted twice, in rss
and in anon_rss.  Which won't be so good if those are atomic counts in some
configurations.

Change that around: keep file_rss and anon_rss separately, and add them
together (with get_mm_rss macro) when the total is needed - reading two
atomics is much cheaper than updating two atomics.  And update anon_rss
upfront, typically in memory.c, not tucked away in page_add_anon_rmap.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins
2005-10-29 18:16:05 -07:00
committed by Linus Torvalds
parent 404351e67a
commit 4294621f41
12 changed files with 38 additions and 37 deletions
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4
include/linux/sched.h
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@@ -254,6 +254,8 @@ extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
#define inc_mm_counter(mm, member) (mm)->_##member++
#define dec_mm_counter(mm, member) (mm)->_##member--
#define get_mm_rss(mm) ((mm)->_file_rss + (mm)->_anon_rss)
typedef unsigned long mm_counter_t;
struct mm_struct {
@@ -286,7 +288,7 @@ struct mm_struct {
unsigned long exec_vm, stack_vm, reserved_vm, def_flags, nr_ptes;
/* Special counters protected by the page_table_lock */
mm_counter_t _rss;
mm_counter_t _file_rss;
mm_counter_t _anon_rss;
unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */