xfs
[Top] [All Lists]

[PATCH 1/3] Add ratelimited printk for different alert levels

To: xfs@xxxxxxxxxxx
Subject: [PATCH 1/3] Add ratelimited printk for different alert levels
From: raghu.prabhu13@xxxxxxxxx
Date: Wed, 12 Sep 2012 03:43:22 +0530
Cc: david@xxxxxxxxxxxxx, Raghavendra D Prabhu <rprabhu@xxxxxxxxxxx>, Ben Myers <bpm@xxxxxxx> (supporter:XFS FILESYSTEM), Alex Elder <elder@xxxxxxxxxx> (supporter:XFS FILESYSTEM), linux-kernel@xxxxxxxxxxxxxxx (open list)
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references :in-reply-to:references; bh=7MOcx5kIBpHa5IAPc1yJ/F1sB33knEETxglltHTk9tU=; b=GAwndDnrvt1vUNk/JIv52nvFPUnBnRni9Ykv49rnuzIxv5hWmsOvUWZ5igU8zHKjvl cOHgzrZt459CEJyD5WWE6CemfttCdrngzuUESpDaqQNeu4S+9do7YXXaxMfPEOK53dSn 9iH4IV+lkzDdBSqPbFycN473QlvjNc37GR1E3+eNfx/4O2KEG0+3IlyrwvUa46aeCpqQ dN7B/9W9ipm4v8uDo/qefmU2MqD6itQmt3AsSGksjk2I2HQhl1Agn9SZ3zbOQpdsTK4J 88KqYXO6758nsWHGPth/yD551a7c2Jxp24mOGcU6KE3pkEpUyQ10kgOa2Qg0OLmwwpLi egdw==
In-reply-to: <cover.1347396641.git.rprabhu@xxxxxxxxxxx>
In-reply-to: <cover.1347396641.git.rprabhu@xxxxxxxxxxx>
References: <cover.1347396641.git.rprabhu@xxxxxxxxxxx>
References: <cover.1347396641.git.rprabhu@xxxxxxxxxxx>
From: Raghavendra D Prabhu <rprabhu@xxxxxxxxxxx>

Ratelimited printk will be useful in printing xfs messages which are otherwise
not required to be printed always due to their high rate (to prevent kernel ring
buffer from overflowing), while at the same time required to be printed.

Signed-off-by: Raghavendra D Prabhu <rprabhu@xxxxxxxxxxx>
---
 fs/xfs/xfs_message.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/fs/xfs/xfs_message.h b/fs/xfs/xfs_message.h
index 56dc0c1..87999a5 100644
--- a/fs/xfs/xfs_message.h
+++ b/fs/xfs/xfs_message.h
@@ -1,6 +1,8 @@
 #ifndef __XFS_MESSAGE_H
 #define __XFS_MESSAGE_H 1
 
+#include <linux/ratelimit.h>
+
 struct xfs_mount;
 
 extern __printf(2, 3)
@@ -30,6 +32,32 @@ void xfs_debug(const struct xfs_mount *mp, const char *fmt, 
...)
 }
 #endif
 
+#define xfs_printk_ratelimited(xfs_printk, dev, fmt, ...)              \
+do {                                                                   \
+       static DEFINE_RATELIMIT_STATE(_rs,                              \
+                                     DEFAULT_RATELIMIT_INTERVAL,       \
+                                     DEFAULT_RATELIMIT_BURST);         \
+       if (__ratelimit(&_rs))                                          \
+               xfs_printk(dev, fmt, ##__VA_ARGS__);                    \
+} while (0)
+
+#define xfs_emerg_ratelimited(dev, fmt, ...)                           \
+       xfs_printk_ratelimited(xfs_emerg, dev, fmt, ##__VA_ARGS__)
+#define xfs_alert_ratelimited(dev, fmt, ...)                           \
+       xfs_printk_ratelimited(xfs_alert, dev, fmt, ##__VA_ARGS__)
+#define xfs_crit_ratelimited(dev, fmt, ...)                            \
+       xfs_printk_ratelimited(xfs_crit, dev, fmt, ##__VA_ARGS__)
+#define xfs_err_ratelimited(dev, fmt, ...)                             \
+       xfs_printk_ratelimited(xfs_err, dev, fmt, ##__VA_ARGS__)
+#define xfs_warn_ratelimited(dev, fmt, ...)                            \
+       xfs_printk_ratelimited(xfs_warn, dev, fmt, ##__VA_ARGS__)
+#define xfs_notice_ratelimited(dev, fmt, ...)                          \
+       xfs_printk_ratelimited(xfs_notice, dev, fmt, ##__VA_ARGS__)
+#define xfs_info_ratelimited(dev, fmt, ...)                            \
+       xfs_printk_ratelimited(xfs_info, dev, fmt, ##__VA_ARGS__)
+#define xfs_dbg_ratelimited(dev, fmt, ...)                             \
+       xfs_printk_ratelimited(xfs_dbg, dev, fmt, ##__VA_ARGS__)
+
 extern void assfail(char *expr, char *f, int l);
 
 extern void xfs_hex_dump(void *p, int length);
-- 
1.7.12

<Prev in Thread] Current Thread [Next in Thread>