Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxx>
Cc: linux-mm@xxxxxxxxx
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
include/linux/cpuhotplug.h | 1 +
mm/page-writeback.c | 26 +++++++-------------------
2 files changed, 8 insertions(+), 19 deletions(-)
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 82ee32107dff..854e59a426d4 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -16,6 +16,7 @@ enum cpuhp_state {
CPUHP_X86_APB_DEAD,
CPUHP_VIRT_NET_DEAD,
CPUHP_SLUB_DEAD,
+ CPUHP_MM_WRITEBACK_DEAD,
CPUHP_WORKQUEUE_PREP,
CPUHP_POWER_NUMA_PREPARE,
CPUHP_HRTIMERS_PREPARE,
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 82e72524db55..6d3d0e87f309 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2050,26 +2050,12 @@ void writeback_set_ratelimit(void)
ratelimit_pages = 16;
}
-static int
-ratelimit_handler(struct notifier_block *self, unsigned long action,
- void *hcpu)
+static int page_writeback_cpu_online(unsigned int cpu)
{
-
- switch (action & ~CPU_TASKS_FROZEN) {
- case CPU_ONLINE:
- case CPU_DEAD:
- writeback_set_ratelimit();
- return NOTIFY_OK;
- default:
- return NOTIFY_DONE;
- }
+ writeback_set_ratelimit();
+ return 0;
}
-static struct notifier_block ratelimit_nb = {
- .notifier_call = ratelimit_handler,
- .next = NULL,
-};
-
/*
* Called early on to tune the page writeback dirty limits.
*
@@ -2092,8 +2078,10 @@ void __init page_writeback_init(void)
{
BUG_ON(wb_domain_init(&global_wb_domain, GFP_KERNEL));
- writeback_set_ratelimit();
- register_cpu_notifier(&ratelimit_nb);
+ cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "MM_WRITEBACK_ONLINE",
+ page_writeback_cpu_online, NULL);
+ cpuhp_setup_state(CPUHP_MM_WRITEBACK_DEAD, "MM_WRITEBACK_DEAD", NULL,
+ page_writeback_cpu_online);
}
/**
--
2.9.3
--
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