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| author | Paul E. McKenney <paulmck@kernel.org> | 2024-12-19 03:16:32 +0300 |
|---|---|---|
| committer | Boqun Feng <boqun.feng@gmail.com> | 2025-02-05 18:12:05 +0300 |
| commit | 5f9e1bc50a046578ddbfb05cda0f053d856bef98 (patch) | |
| tree | 80081948a37cc68e689fc64d024ae1069c12be81 | |
| parent | b459874faa7b6096982552498cab735075e53013 (diff) | |
| download | linux-5f9e1bc50a046578ddbfb05cda0f053d856bef98.tar.xz | |
srcu: Use ->srcu_gp_seq for rcutorture reader batch
This commit stops using ->srcu_idx for rcutorture's reader-batch
consistency checking, using ->srcu_gp_seq instead. This is a first
step towards a faster srcu_read_{,un}lock_lite() that avoids the array
accesses that use ->srcu_idx.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: <bpf@vger.kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
| -rw-r--r-- | kernel/rcu/rcutorture.c | 2 | ||||
| -rw-r--r-- | kernel/rcu/srcutree.c | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index d26fb1d33ed9..1d2de50fb5d6 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -791,6 +791,7 @@ static struct rcu_torture_ops srcu_ops = { .readunlock = srcu_torture_read_unlock, .readlock_held = torture_srcu_read_lock_held, .get_gp_seq = srcu_torture_completed, + .gp_diff = rcu_seq_diff, .deferred_free = srcu_torture_deferred_free, .sync = srcu_torture_synchronize, .exp_sync = srcu_torture_synchronize_expedited, @@ -834,6 +835,7 @@ static struct rcu_torture_ops srcud_ops = { .readunlock = srcu_torture_read_unlock, .readlock_held = torture_srcu_read_lock_held, .get_gp_seq = srcu_torture_completed, + .gp_diff = rcu_seq_diff, .deferred_free = srcu_torture_deferred_free, .sync = srcu_torture_synchronize, .exp_sync = srcu_torture_synchronize_expedited, diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c index b83c74c4dcc0..e69ce9d59abf 100644 --- a/kernel/rcu/srcutree.c +++ b/kernel/rcu/srcutree.c @@ -1675,7 +1675,7 @@ EXPORT_SYMBOL_GPL(srcu_barrier); */ unsigned long srcu_batches_completed(struct srcu_struct *ssp) { - return READ_ONCE(ssp->srcu_idx); + return READ_ONCE(ssp->srcu_sup->srcu_gp_seq); } EXPORT_SYMBOL_GPL(srcu_batches_completed); |