Messages in this thread Patch in this message |  | | | From | Andi Kleen <> | | Subject | [PATCH] [4/9] x86: MCE: Replace machine check events logged interval with ratelimit | | Date | Thu, 12 Feb 2009 13:49:33 +0100 (CET) |
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Impact: feature
Use a standard leaky bucket ratelimit for the machine check warning print interval instead of waiting every check_interval. Also decrease the limit to twice per minute. This interacts better with threshold interrupts because they can happen more often than check_interval.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
--- arch/x86/kernel/cpu/mcheck/mce_64.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) Index: linux/arch/x86/kernel/cpu/mcheck/mce_64.c =================================================================== --- linux.orig/arch/x86/kernel/cpu/mcheck/mce_64.c 2009-02-12 11:30:51.000000000 +0100 +++ linux/arch/x86/kernel/cpu/mcheck/mce_64.c 2009-02-12 12:10:17.000000000 +0100 @@ -28,6 +28,7 @@ #include <linux/kdebug.h> #include <linux/kobject.h> #include <linux/sysfs.h> +#include <linux/ratelimit.h> #include <asm/processor.h> #include <asm/msr.h> #include <asm/mce.h> @@ -488,11 +489,11 @@ */ int mce_notify_user(void) { + /* Not more than two messages every minute */ + static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2); + clear_thread_flag(TIF_MCE_NOTIFY); if (test_and_clear_bit(0, ¬ify_user)) { - static unsigned long last_print; - unsigned long now = jiffies; - wake_up_interruptible(&mce_wait); /* @@ -503,10 +504,8 @@ if (trigger[0] && !work_pending(&mce_trigger_work)) schedule_work(&mce_trigger_work); - if (time_after_eq(now, last_print + (check_interval*HZ))) { - last_print = now; + if (__ratelimit(&ratelimit)) printk(KERN_INFO "Machine check events logged\n"); - } return 1; }
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