From: paulmck@kernel.org
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com,
mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org,
"Paul E. McKenney" <paulmck@kernel.org>
Subject: [PATCH tip/core/rcu 10/12] rcutorture: Dynamically allocate rcu_fwds structure
Date: Mon, 9 Dec 2019 19:42:15 -0800 [thread overview]
Message-ID: <20191210034217.405-10-paulmck@kernel.org> (raw)
In-Reply-To: <20191210034119.GA32711@paulmck-ThinkPad-P72>
From: "Paul E. McKenney" <paulmck@kernel.org>
This commit switches from static structure to dynamic allocation
for rcu_fwds as another step towards providing multiple call_rcu()
forward-progress kthreads.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/rcutorture.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 394baac..f77f4d8 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1686,7 +1686,7 @@ struct rcu_fwd {
unsigned long rcu_launder_gp_seq_start;
};
-struct rcu_fwd rcu_fwds;
+struct rcu_fwd *rcu_fwds;
bool rcu_fwd_emergency_stop;
static void rcu_torture_fwd_cb_hist(struct rcu_fwd *rfp)
@@ -1952,7 +1952,7 @@ static void rcu_torture_fwd_prog_cr(struct rcu_fwd *rfp)
static int rcutorture_oom_notify(struct notifier_block *self,
unsigned long notused, void *nfreed)
{
- struct rcu_fwd *rfp = &rcu_fwds;
+ struct rcu_fwd *rfp = rcu_fwds;
WARN(1, "%s invoked upon OOM during forward-progress testing.\n",
__func__);
@@ -2010,7 +2010,7 @@ static int rcu_torture_fwd_prog(void *args)
/* If forward-progress checking is requested and feasible, spawn the thread. */
static int __init rcu_torture_fwd_prog_init(void)
{
- struct rcu_fwd *rfp = &rcu_fwds;
+ struct rcu_fwd *rfp;
if (!fwd_progress)
return 0; /* Not requested, so don't do it. */
@@ -2026,12 +2026,15 @@ static int __init rcu_torture_fwd_prog_init(void)
WARN_ON(1); /* Make sure rcutorture notices conflict. */
return 0;
}
- spin_lock_init(&rfp->rcu_fwd_lock);
- rfp->rcu_fwd_cb_tail = &rfp->rcu_fwd_cb_head;
if (fwd_progress_holdoff <= 0)
fwd_progress_holdoff = 1;
if (fwd_progress_div <= 0)
fwd_progress_div = 4;
+ rfp = kzalloc(sizeof(*rfp), GFP_KERNEL);
+ if (!rfp)
+ return -ENOMEM;
+ spin_lock_init(&rfp->rcu_fwd_lock);
+ rfp->rcu_fwd_cb_tail = &rfp->rcu_fwd_cb_head;
return torture_create_kthread(rcu_torture_fwd_prog, rfp, fwd_prog_task);
}
--
2.9.5
next prev parent reply other threads:[~2019-12-10 3:42 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-10 3:41 [PATCH tip/core/rcu 0/12] Torture-test updates for v5.6 Paul E. McKenney
2019-12-10 3:42 ` [PATCH tip/core/rcu 01/12] torture: Use gawk instead of awk for systime() function paulmck
2019-12-10 3:42 ` [PATCH tip/core/rcu 02/12] rcutorture: Dispense with Dracut for initrd creation paulmck
2019-12-10 3:42 ` [PATCH tip/core/rcu 03/12] torture: Handle jitter for CPUs that cannot be offlined paulmck
2019-12-10 3:42 ` [PATCH tip/core/rcu 04/12] torture: Handle systems lacking the mpstat command paulmck
2019-12-10 3:42 ` [PATCH tip/core/rcu 05/12] rcutorture: Add worst-case call_rcu() forward-progress results paulmck
2019-12-10 3:42 ` [PATCH tip/core/rcu 06/12] rcutorture: Pull callback forward-progress data into rcu_fwd struct paulmck
2019-12-10 3:42 ` [PATCH tip/core/rcu 07/12] rcutorture: Thread rcu_fwd pointer through forward-progress functions paulmck
2019-12-10 3:42 ` [PATCH tip/core/rcu 08/12] rcutorture: Move to dynamic initialization of rcu_fwds paulmck
2019-12-10 3:42 ` [PATCH tip/core/rcu 09/12] rcutorture: Complete threading rcu_fwd pointers through functions paulmck
2019-12-10 3:42 ` paulmck [this message]
2019-12-10 3:42 ` [PATCH tip/core/rcu 11/12] torture: Allow "CFLIST" to specify default list of scenarios paulmck
2019-12-10 3:42 ` [PATCH tip/core/rcu 12/12] torture: Hoist calls to lscpu to higher-level kvm.sh script paulmck
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