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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-08-18 14:57:20 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-09-06 18:30:20 +0200 |
| commit | 1d7ac6aec947d222042b6d22b3cec109db4fd19e (patch) | |
| tree | b89b1745cde730a020147b6e54d0c93c4c405a87 /mm/page-writeback.c | |
| parent | a96a87bf949d249039cdf532bb5f5d06622cc5e2 (diff) | |
| download | lwn-1d7ac6aec947d222042b6d22b3cec109db4fd19e.tar.gz lwn-1d7ac6aec947d222042b6d22b3cec109db4fd19e.zip | |
mm/writeback: Convert to hotplug state machine
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 <bigeasy@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jens Axboe <axboe@fb.com>
Cc: linux-mm@kvack.org
Cc: rt@linutronix.de
Cc: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/20160818125731.27256-6-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 26 |
1 files changed, 7 insertions, 19 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index f4cd7d8005c9..28d6f36a2d79 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -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); } /** |