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mm/writeback: Convert to hotplug state machine

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Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.

Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Tejun Heo <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Sebastian Andrzej Siewior 2016-08-18 14:57:20 +02:00 • committed by Thomas Gleixner
commit 1d7ac6aec9
2 changed files with 8 additions and 19 deletions
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26
mm/page-writeback.c
View file

@ -2080,26 +2080,12 @@ 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.
*
@ -2122,8 +2108,10 @@ 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);
}
/**