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authorMandeep Singh Baines <msb@google.com>2009-02-06 15:37:47 -0800
committerIngo Molnar <mingo@elte.hu>2009-02-09 11:03:49 +0100
commit17406b82d621930cca8ccc1272cdac9a7dae8e40 (patch)
tree224c8b0b7c78a5467175fe10e116bdc6b73495ea /kernel/fork.c
parent94be52dc075a32af4aa73d7e10f68734d62d6af2 (diff)
softlockup: remove timestamp checking from hung_task
Impact: saves sizeof(long) bytes per task_struct By guaranteeing that sysctl_hung_task_timeout_secs have elapsed between tasklist scans we can avoid using timestamps. Signed-off-by: Mandeep Singh Baines <msb@google.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index fb944428283..bf582f75014 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -639,6 +639,9 @@ static int copy_mm(unsigned long clone_flags, struct task_struct * tsk)
tsk->min_flt = tsk->maj_flt = 0;
tsk->nvcsw = tsk->nivcsw = 0;
+#ifdef CONFIG_DETECT_HUNG_TASK
+ tsk->last_switch_count = tsk->nvcsw + tsk->nivcsw;
+#endif
tsk->mm = NULL;
tsk->active_mm = NULL;
@@ -1041,11 +1044,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->default_timer_slack_ns = current->timer_slack_ns;
-#ifdef CONFIG_DETECT_HUNG_TASK
- p->last_switch_count = 0;
- p->last_switch_timestamp = 0;
-#endif
-
task_io_accounting_init(&p->ioac);
acct_clear_integrals(p);