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rcu: Update stall-warning documentation

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Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2013-08-19 11:59:43 -07:00
parent 272b98c645
commit 64d3b7a1d5
1 changed files with 15 additions and 7 deletions
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22
Documentation/RCU/stallwarn.txt
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@ -12,12 +12,12 @@ CONFIG_RCU_CPU_STALL_TIMEOUT
This kernel configuration parameter defines the period of time This kernel configuration parameter defines the period of time
that RCU will wait from the beginning of a grace period until it that RCU will wait from the beginning of a grace period until it
issues an RCU CPU stall warning. This time period is normally issues an RCU CPU stall warning. This time period is normally
sixty seconds. 21 seconds.
This configuration parameter may be changed at runtime via the This configuration parameter may be changed at runtime via the
/sys/module/rcutree/parameters/rcu_cpu_stall_timeout, however /sys/module/rcutree/parameters/rcu_cpu_stall_timeout, however
this parameter is checked only at the beginning of a cycle. this parameter is checked only at the beginning of a cycle.
So if you are 30 seconds into a 70-second stall, setting this So if you are 10 seconds into a 40-second stall, setting this
sysfs parameter to (say) five will shorten the timeout for the sysfs parameter to (say) five will shorten the timeout for the
-next- stall, or the following warning for the current stall -next- stall, or the following warning for the current stall
(assuming the stall lasts long enough). It will not affect the (assuming the stall lasts long enough). It will not affect the
@ -32,7 +32,7 @@ CONFIG_RCU_CPU_STALL_VERBOSE
also dump the stacks of any tasks that are blocking the current also dump the stacks of any tasks that are blocking the current
RCU-preempt grace period. RCU-preempt grace period.
RCU_CPU_STALL_INFO CONFIG_RCU_CPU_STALL_INFO
This kernel configuration parameter causes the stall warning to This kernel configuration parameter causes the stall warning to
print out additional per-CPU diagnostic information, including print out additional per-CPU diagnostic information, including
@ -43,7 +43,8 @@ RCU_STALL_DELAY_DELTA
Although the lockdep facility is extremely useful, it does add Although the lockdep facility is extremely useful, it does add
some overhead. Therefore, under CONFIG_PROVE_RCU, the some overhead. Therefore, under CONFIG_PROVE_RCU, the
RCU_STALL_DELAY_DELTA macro allows five extra seconds before RCU_STALL_DELAY_DELTA macro allows five extra seconds before
giving an RCU CPU stall warning message. giving an RCU CPU stall warning message. (This is a cpp
macro, not a kernel configuration parameter.)
RCU_STALL_RAT_DELAY RCU_STALL_RAT_DELAY
@ -52,7 +53,8 @@ RCU_STALL_RAT_DELAY
However, if the offending CPU does not detect its own stall in However, if the offending CPU does not detect its own stall in
the number of jiffies specified by RCU_STALL_RAT_DELAY, then the number of jiffies specified by RCU_STALL_RAT_DELAY, then
some other CPU will complain. This delay is normally set to some other CPU will complain. This delay is normally set to
two jiffies. two jiffies. (This is a cpp macro, not a kernel configuration
parameter.)
When a CPU detects that it is stalling, it will print a message similar When a CPU detects that it is stalling, it will print a message similar
to the following: to the following:
@ -86,7 +88,12 @@ printing, there will be a spurious stall-warning message:
INFO: rcu_bh_state detected stalls on CPUs/tasks: { } (detected by 4, 2502 jiffies) INFO: rcu_bh_state detected stalls on CPUs/tasks: { } (detected by 4, 2502 jiffies)
This is rare, but does happen from time to time in real life. This is rare, but does happen from time to time in real life. It is also
possible for a zero-jiffy stall to be flagged in this case, depending
on how the stall warning and the grace-period initialization happen to
interact. Please note that it is not possible to entirely eliminate this
sort of false positive without resorting to things like stop_machine(),
which is overkill for this sort of problem.
If the CONFIG_RCU_CPU_STALL_INFO kernel configuration parameter is set, If the CONFIG_RCU_CPU_STALL_INFO kernel configuration parameter is set,
more information is printed with the stall-warning message, for example: more information is printed with the stall-warning message, for example:
@ -216,4 +223,5 @@ that portion of the stack which remains the same from trace to trace.
If you can reliably trigger the stall, ftrace can be quite helpful. If you can reliably trigger the stall, ftrace can be quite helpful.
RCU bugs can often be debugged with the help of CONFIG_RCU_TRACE RCU bugs can often be debugged with the help of CONFIG_RCU_TRACE
and with RCU's event tracing. and with RCU's event tracing. For information on RCU's event tracing,
see include/trace/events/rcu.h.