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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2011-10-31 23:01:54 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-12-11 19:31:42 +0100 |
| commit | 4145fa7fbee3ec1e61c52825b146192885d9759f (patch) | |
| tree | 58e0767a59bf110acb99da3fb5c1f0f0b5170be8 /kernel/rcu.h | |
| parent | rcu: Add documentation for raw SRCU read-side primitives (diff) | |
| download | linux-4145fa7fbee3ec1e61c52825b146192885d9759f.tar.xz linux-4145fa7fbee3ec1e61c52825b146192885d9759f.zip | |
rcu: Deconfuse dynticks entry-exit tracing
The trace_rcu_dyntick() trace event did not print both the old and
the new value of the nesting level, and furthermore printed only
the low-order 32 bits of it. This could result in some confusion
when interpreting trace-event dumps, so this commit prints both
the old and the new value, prints the full 64 bits, and also selects
the process-entry/exit increment to print nicely in hexadecimal.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcu.h')
| -rw-r--r-- | kernel/rcu.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/rcu.h b/kernel/rcu.h index f600868d550d..aa88baab5f78 100644 --- a/kernel/rcu.h +++ b/kernel/rcu.h @@ -30,6 +30,13 @@ #endif /* #else #ifdef CONFIG_RCU_TRACE */ /* + * Process-level increment to ->dynticks_nesting field. This allows for + * architectures that use half-interrupts and half-exceptions from + * process context. + */ +#define DYNTICK_TASK_NESTING (LLONG_MAX / 2 - 1) + +/* * debug_rcu_head_queue()/debug_rcu_head_unqueue() are used internally * by call_rcu() and rcu callback execution, and are therefore not part of the * RCU API. Leaving in rcupdate.h because they are used by all RCU flavors. |