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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-04-18 16:01:46 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-04-26 11:23:12 -0700 |
| commit | c7e88067c1ae89e7bcbed070fb2c4e30bc39b51f (patch) | |
| tree | 4625614c62fe99fd72292cb9c0e60f2f2ff23b2c /include/linux/srcutree.h | |
| parent | d160a727c40e7175aa642137910a3fda46262fc8 (diff) | |
| download | lwn-c7e88067c1ae89e7bcbed070fb2c4e30bc39b51f.tar.gz lwn-c7e88067c1ae89e7bcbed070fb2c4e30bc39b51f.zip | |
srcu: Exact tracking of srcu_data structures containing callbacks
The current Tree SRCU implementation schedules a workqueue for every
srcu_data covered by a given leaf srcu_node structure having callbacks,
even if only one of those srcu_data structures actually contains
callbacks. This is clearly inefficient for workloads that don't feature
callbacks everywhere all the time. This commit therefore adds an array
of masks that are used by the leaf srcu_node structures to track exactly
which srcu_data structures contain callbacks.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Mike Galbraith <efault@gmx.de>
Diffstat (limited to 'include/linux/srcutree.h')
| -rw-r--r-- | include/linux/srcutree.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/srcutree.h b/include/linux/srcutree.h index 0400e211aa44..94515ff226fb 100644 --- a/include/linux/srcutree.h +++ b/include/linux/srcutree.h @@ -47,6 +47,8 @@ struct srcu_data { struct delayed_work work; /* Context for CB invoking. */ struct rcu_head srcu_barrier_head; /* For srcu_barrier() use. */ struct srcu_node *mynode; /* Leaf srcu_node. */ + unsigned long grpmask; /* Mask for leaf srcu_node */ + /* ->srcu_data_have_cbs[]. */ int cpu; struct srcu_struct *sp; }; @@ -59,6 +61,8 @@ struct srcu_node { unsigned long srcu_have_cbs[4]; /* GP seq for children */ /* having CBs, but only */ /* is > ->srcu_gq_seq. */ + unsigned long srcu_data_have_cbs[4]; /* Which srcu_data structs */ + /* have CBs for given GP? */ struct srcu_node *srcu_parent; /* Next up in tree. */ int grplo; /* Least CPU for node. */ int grphi; /* Biggest CPU for node. */ |