hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

watchdog: Fix code/comments mismatches 

Reflect the change in the soft and hard lockup thresholds and
their relation to the frequency of the hrtimer and NMI events in
the code comments. While at it, remove references to files that
do not exist anymore.

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Don Zickus <dzickus@redhat.com>
Link: http://lkml.kernel.org/r/1328827342-6253-3-git-send-email-dzickus@redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Fernando Luis Vázquez Cao 2012-02-09 17:42:22 -05:00 committed by Ingo Molnar
parent 5f32908943
commit 86f5e6a7b1
1 changed files with 12 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
kernel/watchdog.c
View File

@ -3,12 +3,9 @@
* *
* started by Don Zickus, Copyright (C) 2010 Red Hat, Inc. * started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
* *
* this code detects hard lockups: incidents in where on a CPU * Note: Most of this code is borrowed heavily from the original softlockup
* the kernel does not respond to anything except NMI. * detector, so thanks to Ingo for the initial implementation.
* * Some chunks also taken from the old x86-specific nmi watchdog code, thanks
* Note: Most of this code is borrowed heavily from softlockup.c,
* so thanks to Ingo for the initial implementation.
* Some chunks also taken from arch/x86/kernel/apic/nmi.c, thanks
* to those contributors as well. * to those contributors as well.
*/ */
@ -117,9 +114,10 @@ static unsigned long get_sample_period(void)
{ {
/* /*
* convert watchdog_thresh from seconds to ns * convert watchdog_thresh from seconds to ns
* the divide by 5 is to give hrtimer 5 chances to * the divide by 5 is to give hrtimer several chances (two
* increment before the hardlockup detector generates * or three with the current relation between the soft
* a warning * and hard thresholds) to increment before the
* hardlockup detector generates a warning
*/ */
return get_softlockup_thresh() * (NSEC_PER_SEC / 5); return get_softlockup_thresh() * (NSEC_PER_SEC / 5);
} }
@ -336,9 +334,11 @@ static int watchdog(void *unused)
set_current_state(TASK_INTERRUPTIBLE); set_current_state(TASK_INTERRUPTIBLE);
/* /*
* Run briefly once per second to reset the softlockup timestamp. * Run briefly (kicked by the hrtimer callback function) once every
* If this gets delayed for more than 60 seconds then the * get_sample_period() seconds (4 seconds by default) to reset the
* debug-printout triggers in watchdog_timer_fn(). * softlockup timestamp. If this gets delayed for more than
* 2*watchdog_thresh seconds then the debug-printout triggers in
* watchdog_timer_fn().
*/ */
while (!kthread_should_stop()) { while (!kthread_should_stop()) {
__touch_watchdog(); __touch_watchdog();