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srcu: Add address of first callback to rcutorture output 

This commit adds the address of the first callback to the per-CPU rcutorture
output in order to allow lost wakeups to be more efficiently tracked down.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-05-22 12:28:04 -07:00
parent 17294ce6a4
commit 5ab07a8df4
1 changed files with 8 additions and 7 deletions
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15
kernel/rcu/srcutree.c
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@ -1271,11 +1271,11 @@ void srcu_torture_stats_print(struct srcu_struct *sp, char *tt, char *tf)
unsigned long l0, l1;
unsigned long u0, u1;
long c0, c1;
struct srcu_data *counts;
struct srcu_data *sdp;
counts = per_cpu_ptr(sp->sda, cpu);
u0 = counts->srcu_unlock_count[!idx];
u1 = counts->srcu_unlock_count[idx];
sdp = per_cpu_ptr(sp->sda, cpu);
u0 = sdp->srcu_unlock_count[!idx];
u1 = sdp->srcu_unlock_count[idx];
/*
* Make sure that a lock is always counted if the corresponding
@ -1283,12 +1283,13 @@ void srcu_torture_stats_print(struct srcu_struct *sp, char *tt, char *tf)
*/
smp_rmb();
l0 = counts->srcu_lock_count[!idx];
l1 = counts->srcu_lock_count[idx];
l0 = sdp->srcu_lock_count[!idx];
l1 = sdp->srcu_lock_count[idx];
c0 = l0 - u0;
c1 = l1 - u1;
pr_cont(" %d(%ld,%ld)", cpu, c0, c1);
pr_cont(" %d(%ld,%ld %1p)",
cpu, c0, c1, rcu_segcblist_head(&sdp->srcu_cblist));
s0 += c0;
s1 += c1;
}