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author | Paul E. McKenney <paulmck@kernel.org> | 2022-07-29 05:58:13 +0300 |
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committer | Paul E. McKenney <paulmck@kernel.org> | 2022-08-31 15:08:07 +0300 |
commit | 3fdefca9b42c8bebe3beea5c1a067c9718ca0fc7 (patch) | |
tree | 3779c8a6228ed9d1eb214490a6020621e00e1322 /include/linux/rcutree.h | |
parent | 91a967fd6934abc0c7e4b0d26728e38674278707 (diff) | |
download | linux-3fdefca9b42c8bebe3beea5c1a067c9718ca0fc7.tar.xz |
rcu: Add full-sized polling for get_state()
The get_state_synchronize_rcu() API compresses the combined expedited and
normal grace-period states into a single unsigned long, which conserves
storage, but can miss grace periods in certain cases involving overlapping
normal and expedited grace periods. Missing the occasional grace period
is usually not a problem, but there are use cases that care about each
and every grace period.
This commit therefore adds the next member of the full-state RCU
grace-period polling API, namely the get_state_synchronize_rcu_full()
function. This uses up to three times the storage (rcu_gp_oldstate
structure instead of unsigned long), but is guaranteed not to miss
grace periods.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'include/linux/rcutree.h')
-rw-r--r-- | include/linux/rcutree.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h index 4ccbc3aa9dc2..7b769f1b417a 100644 --- a/include/linux/rcutree.h +++ b/include/linux/rcutree.h @@ -50,6 +50,7 @@ struct rcu_gp_oldstate { unsigned long start_poll_synchronize_rcu_expedited(void); void cond_synchronize_rcu_expedited(unsigned long oldstate); unsigned long get_state_synchronize_rcu(void); +void get_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp); unsigned long start_poll_synchronize_rcu(void); bool poll_state_synchronize_rcu(unsigned long oldstate); bool poll_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp); |