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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>
This commit is contained in:
Paul E. McKenney 2024-12-18 16:16:32 -08:00 committed by Boqun Feng
parent b459874faa
commit 5f9e1bc50a
2 changed files with 3 additions and 1 deletions
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2
kernel/rcu/rcutorture.c
View File

@ -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,

2
kernel/rcu/srcutree.c
View File

@ -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);