From 4294621f41a85497019fae64341aa5351a1921b7 Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Sat, 29 Oct 2005 18:16:05 -0700 Subject: [PATCH] mm: rss = file_rss + anon_rss 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/sched.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/linux/sched.h b/include/linux/sched.h index 27519df0f98..afcaac66cbd 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -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 */ -- cgit v1.2.3