diff options
Diffstat (limited to 'debian/patches-rt/0202-mm-page_alloc-Use-migrate_disable-in-drain_local_pag.patch')
| -rw-r--r-- | debian/patches-rt/0202-mm-page_alloc-Use-migrate_disable-in-drain_local_pag.patch | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/debian/patches-rt/0202-mm-page_alloc-Use-migrate_disable-in-drain_local_pag.patch b/debian/patches-rt/0202-mm-page_alloc-Use-migrate_disable-in-drain_local_pag.patch new file mode 100644 index 000000000..486873119 --- /dev/null +++ b/debian/patches-rt/0202-mm-page_alloc-Use-migrate_disable-in-drain_local_pag.patch @@ -0,0 +1,39 @@ +From 4c4d7886b6c8d16df841ac103b4742481ad5f014 Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Thu, 2 Jul 2020 14:27:23 +0200 +Subject: [PATCH 202/323] mm/page_alloc: Use migrate_disable() in + drain_local_pages_wq() +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +drain_local_pages_wq() disables preemption to avoid CPU migration during +CPU hotplug. +Using migrate_disable() makes the function preemptible on PREEMPT_RT but +still avoids CPU migrations during CPU-hotplug. On !PREEMPT_RT it +behaves like preempt_disable(). + +Use migrate_disable() in drain_local_pages_wq(). + +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + mm/page_alloc.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +diff --git a/mm/page_alloc.c b/mm/page_alloc.c +index a3f1e4c6bdc8..508650843235 100644 +--- a/mm/page_alloc.c ++++ b/mm/page_alloc.c +@@ -3048,9 +3048,9 @@ static void drain_local_pages_wq(struct work_struct *work) + * cpu which is allright but we also have to make sure to not move to + * a different one. + */ +- preempt_disable(); ++ migrate_disable(); + drain_local_pages(drain->zone); +- preempt_enable(); ++ migrate_enable(); + } + + /* +-- +2.43.0 + |