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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]
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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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12
lib/Kconfig.debug
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@ -781,6 +781,18 @@ config RCU_CPU_STALL_DETECTOR
Say Y if you are unsure.
config RCU_CPU_STALL_VERBOSE
bool "Print additional per-task information for RCU_CPU_STALL_DETECTOR"
depends on RCU_CPU_STALL_DETECTOR && TREE_PREEMPT_RCU
default n
help
This option causes RCU to printk detailed per-task information
for any tasks that are stalling the current RCU grace period.
Say N if you are unsure.
Say Y if you want to enable such checks.
config KPROBES_SANITY_TEST
bool "Kprobes sanity tests"
depends on DEBUG_KERNEL