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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2005-10-29 18:16:05 -07:00 • committed by Linus Torvalds
commit 4294621f41
12 changed files with 38 additions and 37 deletions
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kernel/acct.c
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@ -553,7 +553,7 @@ void acct_update_integrals(struct task_struct *tsk)
if (delta == 0)
return;
tsk->acct_stimexpd = tsk->stime;
tsk->acct_rss_mem1 += delta * get_mm_counter(tsk->mm, rss);
tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
}
}