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| author | Ingo Molnar <mingo@kernel.org> | 2012-06-11 10:30:23 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-06-11 10:30:23 +0200 |
| commit | 4a1e001d2bb75c47a9cdbbfb66ae51daff1ddcba (patch) | |
| tree | 6d6e968a087b7a26b3a04af1ef94149607b64358 /kernel/rcutree.h | |
| parent | eab309494ae2b9e15f85520f00de3893162c2e43 (diff) | |
| parent | aa9b16306e3243229580ff889cc59fd66bf77973 (diff) | |
| download | linux-4a1e001d2bb75c47a9cdbbfb66ae51daff1ddcba.tar.bz2 | |
Merge branch 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/urgent
Merge RCU fixes from Paul E. McKenney:
" This series has four patches, the major point of which is to eliminate
some slowdowns (including boot-time slowdowns) resulting from some
RCU_FAST_NO_HZ changes. The issue with the changes is that posting timers
from the idle loop has no effect if the CPU has entered dyntick-idle
mode because the CPU has already computed its wakeup time, and posting
a timer does not cause it to be recomputed. The short-term fix is for
RCU to precompute the timeout value so that the CPU's calculation is
correct. "
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/rcutree.h')
| -rw-r--r-- | kernel/rcutree.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h index 7f5d138dedf5..ea056495783e 100644 --- a/kernel/rcutree.h +++ b/kernel/rcutree.h @@ -84,6 +84,20 @@ struct rcu_dynticks { /* Process level is worth LLONG_MAX/2. */ int dynticks_nmi_nesting; /* Track NMI nesting level. */ atomic_t dynticks; /* Even value for idle, else odd. */ +#ifdef CONFIG_RCU_FAST_NO_HZ + int dyntick_drain; /* Prepare-for-idle state variable. */ + unsigned long dyntick_holdoff; + /* No retries for the jiffy of failure. */ + struct timer_list idle_gp_timer; + /* Wake up CPU sleeping with callbacks. */ + unsigned long idle_gp_timer_expires; + /* When to wake up CPU (for repost). */ + bool idle_first_pass; /* First pass of attempt to go idle? */ + unsigned long nonlazy_posted; + /* # times non-lazy CBs posted to CPU. */ + unsigned long nonlazy_posted_snap; + /* idle-period nonlazy_posted snapshot. */ +#endif /* #ifdef CONFIG_RCU_FAST_NO_HZ */ }; /* RCU's kthread states for tracing. */ |