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rcu: Add RCU_CPU_STALL_VERBOSE to dump detailed per-task information

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When RCU detects a grace-period stall, it currently just prints
out the PID of any tasks doing the stalling.  This patch adds
RCU_CPU_STALL_VERBOSE, which enables the more-verbose reporting
from sched_show_task().

Suggested-by: Thomas Gleixner <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Cc: [email protected]
Cc: [email protected]
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Cc: [email protected]
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Cc: [email protected]
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LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Paul E. McKenney 2010-02-22 17:05:05 -08:00 • committed by Ingo Molnar
commit 1ed509a225
4 changed files with 69 additions and 0 deletions
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4
kernel/rcutree.c
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@ -489,6 +489,10 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
smp_processor_id(), (long)(jiffies - rsp->gp_start));
trigger_all_cpu_backtrace();
/* If so configured, complain about tasks blocking the grace period. */
rcu_print_detail_task_stall(rsp);
force_quiescent_state(rsp, 0); /* Kick them all. */
}