[PATCH] pacct: add pacct_struct to fix some pacct bugs.

The pacct facility need an i/o operation when an accounting record is
generated.  There is a possibility to wake OOM killer up.  If OOM killer is
activated, it kills some processes to make them release process memory
regions.

But acct_process() is called in the killed processes context before calling
exit_mm(), so those processes cannot release own memory.  In the results, any
processes stop in this point and it finally cause a system stall.

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/acct.h b/include/linux/acct.h
index 3d54fbcf969e..5bca9b3ef2d7 100644
--- a/include/linux/acct.h
+++ b/include/linux/acct.h
@@ -121,12 +121,16 @@ struct vfsmount;
 struct super_block;
 extern void acct_auto_close_mnt(struct vfsmount *m);
 extern void acct_auto_close(struct super_block *sb);
+extern void acct_init_pacct(struct pacct_struct *pacct);
+extern void acct_collect();
 extern void acct_process(long exitcode);
 extern void acct_update_integrals(struct task_struct *tsk);
 extern void acct_clear_integrals(struct task_struct *tsk);
 #else
 #define acct_auto_close_mnt(x)  do { } while (0)
 #define acct_auto_close(x)      do { } while (0)
+#define acct_init_pacct(x)      do { } while (0)
+#define acct_collect()          do { } while (0)
 #define acct_process(x)         do { } while (0)
 #define acct_update_integrals(x)                do { } while (0)
 #define acct_clear_integrals(task)      do { } while (0)