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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-01-30 17:02:47 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-02-21 09:06:07 -0800 |
| commit | 2036d94a7b61ca5032ce90f2bda06afec0fe713e (patch) | |
| tree | fc9f4b5ba1058e5a2fdf9ccd187766c90f5ae036 /kernel/rcutree.h | |
| parent | c5fdcec927ee31fc96e92339c3a83ac6e0725289 (diff) | |
| download | linux-2036d94a7b61ca5032ce90f2bda06afec0fe713e.tar.gz linux-2036d94a7b61ca5032ce90f2bda06afec0fe713e.tar.bz2 linux-2036d94a7b61ca5032ce90f2bda06afec0fe713e.zip | |
rcu: Rework detection of use of RCU by offline CPUs
Because newly offlined CPUs continue executing after completing the
CPU_DYING notifiers, they legitimately enter the scheduler and use
RCU while appearing to be offline. This calls for a more sophisticated
approach as follows:
1. RCU marks the CPU online during the CPU_UP_PREPARE phase.
2. RCU marks the CPU offline during the CPU_DEAD phase.
3. Diagnostics regarding use of read-side RCU by offline CPUs use
RCU's accounting rather than the cpu_online_map. (Note that
__call_rcu() still uses cpu_online_map to detect illegal
invocations within CPU_DYING notifiers.)
4. Offline CPUs are prevented from hanging the system by
force_quiescent_state(), which pays attention to cpu_online_map.
Some additional work (in a later commit) will be needed to
guarantee that force_quiescent_state() waits a full jiffy before
assuming that a CPU is offline, for example, when called from
idle entry. (This commit also makes the one-jiffy wait
explicit, since the old-style implicit wait can now be defeated
by RCU_FAST_NO_HZ and by rcutorture.)
This approach avoids the false positives encountered when attempting to
use more exact classification of CPU online/offline state.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree.h')
| -rw-r--r-- | kernel/rcutree.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h index e2ac8ee415bb..cdd1be0a4072 100644 --- a/kernel/rcutree.h +++ b/kernel/rcutree.h @@ -289,7 +289,6 @@ struct rcu_data { /* 4) reasons this CPU needed to be kicked by force_quiescent_state */ unsigned long dynticks_fqs; /* Kicked due to dynticks idle. */ unsigned long offline_fqs; /* Kicked due to being offline. */ - unsigned long resched_ipi; /* Sent a resched IPI. */ /* 5) __rcu_pending() statistics. */ unsigned long n_rcu_pending; /* rcu_pending() calls since boot. */ |