[PATCH] ratelimit files_deny_checkpointing output

[Nathan Lynch]

Any common distribution's boot sequence causes thousands of
"<something> performed an action that cannot be checkpointed"
messages.  Kernels are known to produce other messages of interest at
times, so ratelimit the output of files_deny_checkpointing.


Signed-off-by: Nathan Lynch <ntl@xxxxxxxxx>
---
 include/linux/checkpoint.h |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/checkpoint.h b/include/linux/checkpoint.h
index 27366ac..efdb8f0 100644
--- a/include/linux/checkpoint.h
+++ b/include/linux/checkpoint.h
@@ -108,8 +108,10 @@ static inline void __files_deny_checkpointing(const struct task_struct *tsk,
 {
 	if (!test_and_clear_bit(0, &files->may_checkpoint))
 		return;
-	printk(KERN_INFO "%s/%i performed an action that can not be "
-	       "checkpointed at: %s:%d\n", tsk->comm, tsk->pid, file, line);
+	if (printk_ratelimit())
+		printk(KERN_INFO "%s/%i performed an action that can not be "
+				"checkpointed at: %s:%d\n",
+				tsk->comm, tsk->pid, file, line);
 }
 #define files_deny_checkpointing(tsk,f)				\
 	__files_deny_checkpointing(tsk, f, __FILE__, __LINE__)
-- 
1.6.0.6

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