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authorYury Polyanskiy <ypolyans@princeton.edu>2010-05-24 14:33:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-25 08:07:02 -0700
commit940370fc86b920b51a34217a1facc3e9e97c2456 (patch)
tree6d53529bc158408c42df40d78ee728adb399f787
parentb3b77c8caef1750ebeea1054e39e358550ea9f55 (diff)
downloadlinux-940370fc86b920b51a34217a1facc3e9e97c2456.tar.bz2
hangcheck-timer: fix x86_32 bugs
drivers/char/hangcheck-timer.c is doubly broken. When the overflown value of TIMER_FREQ is abnormally low, it spams the syslog with KERN_CRIT messages "Hangcheck: hangcheck value past margin!" But whether it happens or not depends on HZ and lpj in a complex way. People have hit it occasionally as far as google search can tell. First, the following line overflows unsigned long: # define TIMER_FREQ (HZ*loops_per_jiffy) Second, and more importantly, loops_per_jiffy has little to do with the con= version from the the time scale of get_cycles() (aka rdtsc) to the time scale of jiffies. The attached patch resolves both of the problems. Acked-by: Joel Becker <joel.becker@oracle.com> Cc: john stultz <johnstul@us.ibm.com> Cc: Jan Glauber <jan.glauber@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/char/hangcheck-timer.c20
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/char/hangcheck-timer.c b/drivers/char/hangcheck-timer.c
index 712d9f271aa6..e0249722d25f 100644
--- a/drivers/char/hangcheck-timer.c
+++ b/drivers/char/hangcheck-timer.c
@@ -49,8 +49,9 @@
#include <asm/uaccess.h>
#include <linux/sysrq.h>
#include <linux/timer.h>
+#include <linux/time.h>
-#define VERSION_STR "0.9.0"
+#define VERSION_STR "0.9.1"
#define DEFAULT_IOFENCE_MARGIN 60 /* Default fudge factor, in seconds */
#define DEFAULT_IOFENCE_TICK 180 /* Default timer timeout, in seconds */
@@ -119,10 +120,8 @@ __setup("hcheck_dump_tasks", hangcheck_parse_dump_tasks);
#if defined(CONFIG_S390)
# define HAVE_MONOTONIC
# define TIMER_FREQ 1000000000ULL
-#elif defined(CONFIG_IA64)
-# define TIMER_FREQ ((unsigned long long)local_cpu_data->itc_freq)
#else
-# define TIMER_FREQ (HZ*loops_per_jiffy)
+# define TIMER_FREQ 1000000000ULL
#endif
#ifdef HAVE_MONOTONIC
@@ -130,7 +129,9 @@ extern unsigned long long monotonic_clock(void);
#else
static inline unsigned long long monotonic_clock(void)
{
- return get_cycles();
+ struct timespec ts;
+ getrawmonotonic(&ts);
+ return timespec_to_ns(&ts);
}
#endif /* HAVE_MONOTONIC */
@@ -168,6 +169,13 @@ static void hangcheck_fire(unsigned long data)
printk(KERN_CRIT "Hangcheck: hangcheck value past margin!\n");
}
}
+#if 0
+ /*
+ * Enable to investigate delays in detail
+ */
+ printk("Hangcheck: called %Ld ns since last time (%Ld ns overshoot)\n",
+ tsc_diff, tsc_diff - hangcheck_tick*TIMER_FREQ);
+#endif
mod_timer(&hangcheck_ticktock, jiffies + (hangcheck_tick*HZ));
hangcheck_tsc = monotonic_clock();
}
@@ -180,7 +188,7 @@ static int __init hangcheck_init(void)
#if defined (HAVE_MONOTONIC)
printk("Hangcheck: Using monotonic_clock().\n");
#else
- printk("Hangcheck: Using get_cycles().\n");
+ printk("Hangcheck: Using getrawmonotonic().\n");
#endif /* HAVE_MONOTONIC */
hangcheck_tsc_margin =
(unsigned long long)(hangcheck_margin + hangcheck_tick);