lkml.org 
[lkml]   [2021]   [Jun]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip: core/rcu] kvfree_rcu: Add a bulk-list check when a scheduler is run
The following commit has been merged into the core/rcu branch of tip:

Commit-ID: d434c00fa3ac476ca6295b8310d097dd71984624
Gitweb: https://git.kernel.org/tip/d434c00fa3ac476ca6295b8310d097dd71984624
Author: Uladzislau Rezki (Sony) <urezki@gmail.com>
AuthorDate: Thu, 15 Apr 2021 19:19:58 +02:00
Committer: Paul E. McKenney <paulmck@kernel.org>
CommitterDate: Mon, 10 May 2021 16:00:48 -07:00

kvfree_rcu: Add a bulk-list check when a scheduler is run

The rcu_scheduler_active flag is set to RCU_SCHEDULER_RUNNING once the
scheduler is up and running. That signal is used in order to check
and queue a "monitor work" to reclaim freed objects (if there are any)
during early boot. This flag is used by kvfree_rcu() to determine when
work can safely be queued, at which point memory passed to earlier
invocations of kvfree_rcu() can be processed.

However, only "krcp->head" is checked for objects that need to be
released, and there are now two more, namely, "krcp->bkvhead[0]" and
"krcp->bkvhead[1]". Therefore, check these two additional channels.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/tree.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 676a49a..e86f32d 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3739,7 +3739,8 @@ void __init kfree_rcu_scheduler_running(void)
struct kfree_rcu_cpu *krcp = per_cpu_ptr(&krc, cpu);

raw_spin_lock_irqsave(&krcp->lock, flags);
- if (!krcp->head || krcp->monitor_todo) {
+ if ((!krcp->bkvhead[0] && !krcp->bkvhead[1] && !krcp->head) ||
+ krcp->monitor_todo) {
raw_spin_unlock_irqrestore(&krcp->lock, flags);
continue;
}
\
 
 \ /
  Last update: 2021-06-30 15:52    [W:0.028 / U:0.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site