[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.
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 38b4791e..abada7c 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -358,6 +358,10 @@
spinlock_t siglock;
};
+struct pacct_struct {
+ unsigned long ac_mem;
+};
+
/*
* NOTE! "signal_struct" does not have it's own
* locking, because a shared signal_struct always
@@ -449,6 +453,9 @@
struct key *session_keyring; /* keyring inherited over fork */
struct key *process_keyring; /* keyring private to this process */
#endif
+#ifdef CONFIG_BSD_PROCESS_ACCT
+ struct pacct_struct pacct; /* per-process accounting information */
+#endif
};
/* Context switch must be unlocked if interrupts are to be enabled */