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rcu: Restructure rcu_check_gp_kthread_starvation()

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This commit removes the rsp and gpa local variables, repurposes the j
local variable and adds a gpk (GP kthread) local to improve readability.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-07-04 18:25:59 -07:00
parent f7dd7d44fd
commit 7cba4775ba
1 changed files with 11 additions and 14 deletions
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25
kernel/rcu/tree.c
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@ -1225,24 +1225,21 @@ static const char *gp_state_getname(short gs)
*/
static void rcu_check_gp_kthread_starvation(void)
{
unsigned long gpa;
struct task_struct *gpk = rcu_state.gp_kthread;
unsigned long j;
struct rcu_state *rsp = &rcu_state;
j = jiffies;
gpa = READ_ONCE(rsp->gp_activity);
if (j - gpa > 2 * HZ) {
j = jiffies - READ_ONCE(rcu_state.gp_activity);
if (j > 2 * HZ) {
pr_err("%s kthread starved for %ld jiffies! g%ld f%#x %s(%d) ->state=%#lx ->cpu=%d\n",
rsp->name, j - gpa,
(long)rcu_seq_current(&rsp->gp_seq),
rsp->gp_flags,
gp_state_getname(rsp->gp_state), rsp->gp_state,
rsp->gp_kthread ? rsp->gp_kthread->state : ~0,
rsp->gp_kthread ? task_cpu(rsp->gp_kthread) : -1);
if (rsp->gp_kthread) {
rcu_state.name, j,
(long)rcu_seq_current(&rcu_state.gp_seq),
rcu_state.gp_flags,
gp_state_getname(rcu_state.gp_state), rcu_state.gp_state,
gpk ? gpk->state : ~0, gpk ? task_cpu(gpk) : -1);
if (gpk) {
pr_err("RCU grace-period kthread stack dump:\n");
sched_show_task(rsp->gp_kthread);
wake_up_process(rsp->gp_kthread);
sched_show_task(gpk);
wake_up_process(gpk);
}
}
}