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authorJoel Fernandes (Google) <joel@joelfernandes.org>2019-08-30 12:36:33 -0400
committerPaul E. McKenney <paulmck@kernel.org>2020-01-24 10:24:31 -0800
commit189a6883dcf7fa70e17403ae4225c60ffc9e404b (patch)
tree4548de70883a5e0c1e5d2d131699b352e81090a6 /kernel/rcu
parentrcu: Remove kfree_rcu() special casing and lazy-callback handling (diff)
downloadlinux-dev-189a6883dcf7fa70e17403ae4225c60ffc9e404b.tar.xz
linux-dev-189a6883dcf7fa70e17403ae4225c60ffc9e404b.zip
rcu: Remove kfree_call_rcu_nobatch()
Now that the kfree_rcu() special-casing has been removed from tree RCU, this commit removes kfree_call_rcu_nobatch() since it is no longer needed. Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/rcuperf.c10
-rw-r--r--kernel/rcu/tree.c18
2 files changed, 5 insertions, 23 deletions
diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c
index c1e25fd10f2a..da94b89cd531 100644
--- a/kernel/rcu/rcuperf.c
+++ b/kernel/rcu/rcuperf.c
@@ -593,7 +593,6 @@ rcu_perf_shutdown(void *arg)
torture_param(int, kfree_nthreads, -1, "Number of threads running loops of kfree_rcu().");
torture_param(int, kfree_alloc_num, 8000, "Number of allocations and frees done in an iteration.");
torture_param(int, kfree_loops, 10, "Number of loops doing kfree_alloc_num allocations and frees.");
-torture_param(int, kfree_no_batch, 0, "Use the non-batching (slower) version of kfree_rcu().");
static struct task_struct **kfree_reader_tasks;
static int kfree_nrealthreads;
@@ -632,14 +631,7 @@ kfree_perf_thread(void *arg)
if (!alloc_ptr)
return -ENOMEM;
- if (!kfree_no_batch) {
- kfree_rcu(alloc_ptr, rh);
- } else {
- rcu_callback_t cb;
-
- cb = (rcu_callback_t)(unsigned long)offsetof(struct kfree_obj, rh);
- kfree_call_rcu_nobatch(&(alloc_ptr->rh), cb);
- }
+ kfree_rcu(alloc_ptr, rh);
}
cond_resched();
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index a8dd612098bf..31d2d9255d95 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2763,8 +2763,10 @@ static void kfree_rcu_work(struct work_struct *work)
rcu_lock_acquire(&rcu_callback_map);
trace_rcu_invoke_kfree_callback(rcu_state.name, head, offset);
- /* Could be possible to optimize with kfree_bulk in future */
- kfree((void *)head - offset);
+ if (!WARN_ON_ONCE(!__is_kfree_rcu_offset(offset))) {
+ /* Could be optimized with kfree_bulk() in future. */
+ kfree((void *)head - offset);
+ }
rcu_lock_release(&rcu_callback_map);
cond_resched_tasks_rcu_qs();
@@ -2836,16 +2838,6 @@ static void kfree_rcu_monitor(struct work_struct *work)
}
/*
- * This version of kfree_call_rcu does not do batching of kfree_rcu() requests.
- * Used only by rcuperf torture test for comparison with kfree_rcu_batch().
- */
-void kfree_call_rcu_nobatch(struct rcu_head *head, rcu_callback_t func)
-{
- __call_rcu(head, func);
-}
-EXPORT_SYMBOL_GPL(kfree_call_rcu_nobatch);
-
-/*
* Queue a request for lazy invocation of kfree() after a grace period.
*
* Each kfree_call_rcu() request is added to a batch. The batch will be drained
@@ -2864,8 +2856,6 @@ void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
unsigned long flags;
struct kfree_rcu_cpu *krcp;
- head->func = func;
-
local_irq_save(flags); // For safely calling this_cpu_ptr().
krcp = this_cpu_ptr(&krc);
if (krcp->initialized)