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authorIngo Molnar <mingo@elte.hu>2005-09-06 18:16:27 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-07 19:57:17 -0400
commit8446f1d391f3d27e6bf9c43d4cbcdac0ca720417 (patch)
tree738853af877c9a391b4f2db467e7f90c6e2e38ed /init
parent4732efbeb997189d9f9b04708dc26bf8613ed721 (diff)
[PATCH] detect soft lockups
This patch adds a new kernel debug feature: CONFIG_DETECT_SOFTLOCKUP. When enabled then per-CPU watchdog threads are started, which try to run once per second. If they get delayed for more than 10 seconds then a callback from the timer interrupt detects this condition and prints out a warning message and a stack dump (once per lockup incident). The feature is otherwise non-intrusive, it doesnt try to unlock the box in any way, it only gets the debug info out, automatically, and on all CPUs affected by the lockup. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-Off-By: Matthias Urlichs <smurf@smurf.noris.de> Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'init')
-rw-r--r--init/main.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c
index ff410063e4e1..a29fb2ac7240 100644
--- a/init/main.c
+++ b/init/main.c
@@ -614,6 +614,7 @@ static void do_pre_smp_initcalls(void)
614 migration_init(); 614 migration_init();
615#endif 615#endif
616 spawn_ksoftirqd(); 616 spawn_ksoftirqd();
617 spawn_softlockup_task();
617} 618}
618 619
619static void run_init_process(char *init_filename) 620static void run_init_process(char *init_filename)