linux-kernel - Re: [RFC][PATCH 00/11] track files for checkpointability

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Date:	Tue, 10 Mar 2009 11:00:00 -0500
From:	Nathan Lynch <ntl@...ox.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	containers <containers@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [RFC][PATCH 00/11] track files for checkpointability

>From 3695fbda6225d2436e4af67a4bce6984df0891be Mon Sep 17 00:00:00 2001
From: Nathan Lynch <ntl@...ox.com>
Date: Mon, 9 Mar 2009 22:36:40 -0500
Subject: [PATCH] ratelimit files_deny_checkpointing output

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@...ox.com>
---
 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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