Add the comment to explain acct_arg_size().
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
---
fs/exec.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- 38/fs/exec.c~4_doc_acct_arg_size 2011-03-06 17:56:26.000000000 +0100
+++ 38/fs/exec.c 2011-03-06 17:56:47.000000000 +0100
@@ -164,7 +164,12 @@ out:
}
#ifdef CONFIG_MMU
-
+/*
+ * The nascent bprm->mm is not visible until exec_mmap() but it can
+ * use a lot of memory, account these pages in current->mm temporary
+ * for oom_badness()->get_mm_rss(). Once exec succeeds or fails, we
+ * change the counter back via acct_arg_size(0).
+ */
static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)
{
struct mm_struct *mm = current->mm;
--
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