bcachefs: Rip out copygc pd controller

We have a separate mechanism for ratelimiting copygc now - the pd
controller has only been causing problems.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/alloc_background.c

@@ -31,38 +31,6 @@ static const unsigned BCH_ALLOC_V1_FIELD_BYTES[] = {
 #undef x
 };
 
-/* Ratelimiting/PD controllers */
-
-static void pd_controllers_update(struct work_struct *work)
-{
-	struct bch_fs *c = container_of(to_delayed_work(work),
-					   struct bch_fs,
-					   pd_controllers_update);
-	struct bch_dev *ca;
-	s64 free = 0, fragmented = 0;
-	unsigned i;
-
-	for_each_member_device(ca, c, i) {
-		struct bch_dev_usage stats = bch2_dev_usage_read(ca);
-
-		free += bucket_to_sector(ca,
-				__dev_buckets_available(ca, stats)) << 9;
-		/*
-		 * Bytes of internal fragmentation, which can be
-		 * reclaimed by copy GC
-		 */
-		fragmented += max_t(s64, 0, (bucket_to_sector(ca,
-					stats.d[BCH_DATA_user].buckets +
-					stats.d[BCH_DATA_cached].buckets) -
-				  (stats.d[BCH_DATA_user].sectors +
-				   stats.d[BCH_DATA_cached].sectors)) << 9);
-	}
-
-	bch2_pd_controller_update(&c->copygc_pd, free, fragmented, -1);
-	schedule_delayed_work(&c->pd_controllers_update,
-			      c->pd_controllers_update_seconds * HZ);
-}
-
 /* Persistent alloc info: */
 
 static inline u64 alloc_field_v1_get(const struct bch_alloc *a,
@@ -1405,7 +1373,4 @@ int bch2_dev_allocator_start(struct bch_dev *ca)
 void bch2_fs_allocator_background_init(struct bch_fs *c)
 {
 	spin_lock_init(&c->freelist_lock);
-
-	c->pd_controllers_update_seconds = 5;
-	INIT_DELAYED_WORK(&c->pd_controllers_update, pd_controllers_update);
 }

fs/bcachefs/bcachefs.h

@@ -664,9 +664,6 @@ struct bch_fs {
 	struct workqueue_struct	*copygc_wq;
 
 	/* ALLOCATION */
-	struct delayed_work	pd_controllers_update;
-	unsigned		pd_controllers_update_seconds;
-
 	struct bch_devs_mask	rw_devs[BCH_DATA_NR];
 
 	u64			capacity; /* sectors */
@@ -771,7 +768,6 @@ mempool_t		bio_bounce_pages;
 	/* COPYGC */
 	struct task_struct	*copygc_thread;
 	copygc_heap		copygc_heap;
-	struct bch_pd_controller copygc_pd;
 	struct write_point	copygc_write_point;
 	s64			copygc_wait;
 

fs/bcachefs/movinggc.c

@@ -222,7 +222,7 @@ static int bch2_copygc(struct bch_fs *c)
 	ret = bch2_move_data(c,
 			     0,			POS_MIN,
 			     BTREE_ID_NR,	POS_MAX,
-			     &c->copygc_pd.rate,
+			     NULL,
 			     writepoint_ptr(&c->copygc_write_point),
 			     copygc_pred, NULL,
 			     &move_stats);
@@ -328,9 +328,6 @@ static int bch2_copygc_thread(void *arg)
 
 void bch2_copygc_stop(struct bch_fs *c)
 {
-	c->copygc_pd.rate.rate = UINT_MAX;
-	bch2_ratelimit_reset(&c->copygc_pd.rate);
-
 	if (c->copygc_thread) {
 		kthread_stop(c->copygc_thread);
 		put_task_struct(c->copygc_thread);
@@ -367,6 +364,4 @@ int bch2_copygc_start(struct bch_fs *c)
 
 void bch2_fs_copygc_init(struct bch_fs *c)
 {
-	bch2_pd_controller_init(&c->copygc_pd);
-	c->copygc_pd.d_term = 0;
 }

fs/bcachefs/super.c

@@ -293,7 +293,6 @@ void bch2_fs_read_only(struct bch_fs *c)
 	percpu_ref_kill(&c->writes);
 
 	cancel_work_sync(&c->ec_stripe_delete_work);
-	cancel_delayed_work(&c->pd_controllers_update);
 
 	/*
 	 * If we're not doing an emergency shutdown, we want to wait on
@@ -378,8 +377,6 @@ static int bch2_fs_read_write_late(struct bch_fs *c)
 		return ret;
 	}
 
-	schedule_delayed_work(&c->pd_controllers_update, 5 * HZ);
-
 	schedule_work(&c->ec_stripe_delete_work);
 
 	return 0;
@@ -571,7 +568,6 @@ void __bch2_fs_stop(struct bch_fs *c)
 		cancel_work_sync(&ca->io_error_work);
 
 	cancel_work_sync(&c->btree_write_error_work);
-	cancel_delayed_work_sync(&c->pd_controllers_update);
 	cancel_work_sync(&c->read_only_work);
 }
 

fs/bcachefs/sysfs.c

@@ -189,7 +189,6 @@ rw_attribute(label);
 
 rw_attribute(copy_gc_enabled);
 read_attribute(copy_gc_wait);
-sysfs_pd_controller_attribute(copy_gc);
 
 rw_attribute(rebalance_enabled);
 sysfs_pd_controller_attribute(rebalance);
@@ -198,8 +197,6 @@ rw_attribute(promote_whole_extents);
 
 read_attribute(new_stripes);
 
-rw_attribute(pd_controllers_update_seconds);
-
 read_attribute(io_timers_read);
 read_attribute(io_timers_write);
 
@@ -331,12 +328,8 @@ SHOW(bch2_fs)
 
 	sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled);
 
-	sysfs_print(pd_controllers_update_seconds,
-		    c->pd_controllers_update_seconds);
-
 	sysfs_printf(rebalance_enabled,		"%i", c->rebalance.enabled);
 	sysfs_pd_controller_show(rebalance,	&c->rebalance.pd); /* XXX */
-	sysfs_pd_controller_show(copy_gc,	&c->copygc_pd);
 	sysfs_hprint(copy_gc_wait,
 		     max(0LL, c->copygc_wait -
 			 atomic64_read(&c->io_clock[WRITE].now)) << 9);
@@ -447,10 +440,7 @@ STORE(bch2_fs)
 		return ret;
 	}
 
-	sysfs_strtoul(pd_controllers_update_seconds,
-		      c->pd_controllers_update_seconds);
 	sysfs_pd_controller_store(rebalance,	&c->rebalance.pd);
-	sysfs_pd_controller_store(copy_gc,	&c->copygc_pd);
 
 	sysfs_strtoul(promote_whole_extents,	c->promote_whole_extents);
 
@@ -572,7 +562,6 @@ struct attribute *bch2_fs_internal_files[] = {
 	&sysfs_rebalance_enabled,
 	&sysfs_rebalance_work,
 	sysfs_pd_controller_files(rebalance),
-	sysfs_pd_controller_files(copy_gc),
 
 	&sysfs_new_stripes,