+// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
#include "alloc_foreground.h"
#include <linux/sched/cputime.h>
#include <trace/events/bcachefs.h>
-static inline bool rebalance_ptr_pred(struct bch_fs *c,
- struct extent_ptr_decoded p,
- struct bch_io_opts *io_opts)
+/*
+ * Check if an extent should be moved:
+ * returns -1 if it should not be moved, or
+ * device of pointer that should be moved, if known, or INT_MAX if unknown
+ */
+static int __bch2_rebalance_pred(struct bch_fs *c,
+ struct bkey_s_c k,
+ struct bch_io_opts *io_opts)
{
- if (io_opts->background_target &&
- !bch2_dev_in_target(c, p.ptr.dev, io_opts->background_target) &&
- !p.ptr.cached)
- return true;
+ struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
+ const union bch_extent_entry *entry;
+ struct extent_ptr_decoded p;
if (io_opts->background_compression &&
- p.crc.compression_type !=
- bch2_compression_opt_to_type[io_opts->background_compression])
- return true;
-
- return false;
+ !bch2_bkey_is_incompressible(k))
+ bkey_for_each_ptr_decode(k.k, ptrs, p, entry)
+ if (!p.ptr.cached &&
+ p.crc.compression_type !=
+ bch2_compression_opt_to_type[io_opts->background_compression])
+ return p.ptr.dev;
+
+ if (io_opts->background_target)
+ bkey_for_each_ptr_decode(k.k, ptrs, p, entry)
+ if (!p.ptr.cached &&
+ !bch2_dev_in_target(c, p.ptr.dev, io_opts->background_target))
+ return p.ptr.dev;
+
+ return -1;
}
void bch2_rebalance_add_key(struct bch_fs *c,
struct bkey_s_c k,
struct bch_io_opts *io_opts)
{
- const union bch_extent_entry *entry;
- struct extent_ptr_decoded p;
- struct bkey_s_c_extent e;
+ atomic64_t *counter;
+ int dev;
- if (!bkey_extent_is_data(k.k))
+ dev = __bch2_rebalance_pred(c, k, io_opts);
+ if (dev < 0)
return;
- if (!io_opts->background_target &&
- !io_opts->background_compression)
- return;
-
- e = bkey_s_c_to_extent(k);
+ counter = dev < INT_MAX
+ ? &bch_dev_bkey_exists(c, dev)->rebalance_work
+ : &c->rebalance.work_unknown_dev;
- extent_for_each_ptr_decode(e, p, entry)
- if (rebalance_ptr_pred(c, p, io_opts)) {
- struct bch_dev *ca = bch_dev_bkey_exists(c, p.ptr.dev);
-
- if (atomic64_add_return(p.crc.compressed_size,
- &ca->rebalance_work) ==
- p.crc.compressed_size)
- rebalance_wakeup(c);
- }
-}
-
-void bch2_rebalance_add_work(struct bch_fs *c, u64 sectors)
-{
- if (atomic64_add_return(sectors, &c->rebalance.work_unknown_dev) ==
- sectors)
+ if (atomic64_add_return(k.k->size, counter) == k.k->size)
rebalance_wakeup(c);
}
struct bch_io_opts *io_opts,
struct data_opts *data_opts)
{
- switch (k.k->type) {
- case KEY_TYPE_extent: {
- struct bkey_s_c_extent e = bkey_s_c_to_extent(k);
- const union bch_extent_entry *entry;
- struct extent_ptr_decoded p;
-
- /* Make sure we have room to add a new pointer: */
- if (bkey_val_u64s(e.k) + BKEY_EXTENT_PTR_U64s_MAX >
- BKEY_EXTENT_VAL_U64s_MAX)
- return DATA_SKIP;
-
- extent_for_each_ptr_decode(e, p, entry)
- if (rebalance_ptr_pred(c, p, io_opts))
- goto found;
-
- return DATA_SKIP;
-found:
+ if (__bch2_rebalance_pred(c, k, io_opts) >= 0) {
data_opts->target = io_opts->background_target;
+ data_opts->nr_replicas = 1;
data_opts->btree_insert_flags = 0;
return DATA_ADD_REPLICAS;
- }
- default:
+ } else {
return DATA_SKIP;
}
}
+void bch2_rebalance_add_work(struct bch_fs *c, u64 sectors)
+{
+ if (atomic64_add_return(sectors, &c->rebalance.work_unknown_dev) ==
+ sectors)
+ rebalance_wakeup(c);
+}
+
struct rebalance_work {
int dev_most_full_idx;
unsigned dev_most_full_percent;
struct bch_fs_rebalance *r = &c->rebalance;
struct io_clock *clock = &c->io_clock[WRITE];
struct rebalance_work w, p;
+ struct bch_move_stats move_stats;
unsigned long start, prev_start;
unsigned long prev_run_time, prev_run_cputime;
unsigned long cputime, prev_cputime;
- unsigned long io_start;
+ u64 io_start;
long throttle;
set_freezable();
- io_start = atomic_long_read(&clock->now);
+ io_start = atomic64_read(&clock->now);
p = rebalance_work(c);
prev_start = jiffies;
prev_cputime = curr_cputime();
+ bch_move_stats_init(&move_stats, "rebalance");
while (!kthread_wait_freezable(r->enabled)) {
+ cond_resched();
+
start = jiffies;
cputime = curr_cputime();
prev_run_time;
if (w.dev_most_full_percent < 20 && throttle > 0) {
- r->state = REBALANCE_THROTTLED;
r->throttled_until_iotime = io_start +
div_u64(w.dev_most_full_capacity *
(20 - w.dev_most_full_percent),
50);
- r->throttled_until_cputime = start + throttle;
- bch2_kthread_io_clock_wait(clock,
- r->throttled_until_iotime,
- throttle);
- continue;
+ if (atomic64_read(&clock->now) + clock->max_slop <
+ r->throttled_until_iotime) {
+ r->throttled_until_cputime = start + throttle;
+ r->state = REBALANCE_THROTTLED;
+
+ bch2_kthread_io_clock_wait(clock,
+ r->throttled_until_iotime,
+ throttle);
+ continue;
+ }
}
/* minimum 1 mb/sec: */
max(p.dev_most_full_percent, 1U) /
max(w.dev_most_full_percent, 1U));
- io_start = atomic_long_read(&clock->now);
+ io_start = atomic64_read(&clock->now);
p = w;
prev_start = start;
prev_cputime = cputime;
r->state = REBALANCE_RUNNING;
- memset(&r->move_stats, 0, sizeof(r->move_stats));
+ memset(&move_stats, 0, sizeof(move_stats));
rebalance_work_reset(c);
bch2_move_data(c,
+ 0, POS_MIN,
+ BTREE_ID_NR, POS_MAX,
/* ratelimiting disabled for now */
NULL, /* &r->pd.rate, */
writepoint_ptr(&c->rebalance_write_point),
- POS_MIN, POS_MAX,
rebalance_pred, NULL,
- &r->move_stats);
+ &move_stats);
}
return 0;
}
-ssize_t bch2_rebalance_work_show(struct bch_fs *c, char *buf)
+void bch2_rebalance_work_to_text(struct printbuf *out, struct bch_fs *c)
{
- struct printbuf out = _PBUF(buf, PAGE_SIZE);
struct bch_fs_rebalance *r = &c->rebalance;
struct rebalance_work w = rebalance_work(c);
char h1[21], h2[21];
- bch2_hprint(h1, w.dev_most_full_work << 9);
- bch2_hprint(h2, w.dev_most_full_capacity << 9);
- pr_buf(&out, "fullest_dev (%i):\t%s/%s\n",
+ bch2_hprint(&PBUF(h1), w.dev_most_full_work << 9);
+ bch2_hprint(&PBUF(h2), w.dev_most_full_capacity << 9);
+ pr_buf(out, "fullest_dev (%i):\t%s/%s\n",
w.dev_most_full_idx, h1, h2);
- bch2_hprint(h1, w.total_work << 9);
- bch2_hprint(h2, c->capacity << 9);
- pr_buf(&out, "total work:\t\t%s/%s\n", h1, h2);
+ bch2_hprint(&PBUF(h1), w.total_work << 9);
+ bch2_hprint(&PBUF(h2), c->capacity << 9);
+ pr_buf(out, "total work:\t\t%s/%s\n", h1, h2);
- pr_buf(&out, "rate:\t\t\t%u\n", r->pd.rate.rate);
+ pr_buf(out, "rate:\t\t\t%u\n", r->pd.rate.rate);
switch (r->state) {
case REBALANCE_WAITING:
- pr_buf(&out, "waiting\n");
+ pr_buf(out, "waiting\n");
break;
case REBALANCE_THROTTLED:
- bch2_hprint(h1,
+ bch2_hprint(&PBUF(h1),
(r->throttled_until_iotime -
- atomic_long_read(&c->io_clock[WRITE].now)) << 9);
- pr_buf(&out, "throttled for %lu sec or %s io\n",
+ atomic64_read(&c->io_clock[WRITE].now)) << 9);
+ pr_buf(out, "throttled for %lu sec or %s io\n",
(r->throttled_until_cputime - jiffies) / HZ,
h1);
break;
case REBALANCE_RUNNING:
- pr_buf(&out, "running\n");
- pr_buf(&out, "pos %llu:%llu\n",
- r->move_stats.iter.pos.inode,
- r->move_stats.iter.pos.offset);
+ pr_buf(out, "running\n");
break;
}
-
- return out.pos - buf;
}
void bch2_rebalance_stop(struct bch_fs *c)
{
struct task_struct *p;
+ if (c->rebalance.thread)
+ return 0;
+
if (c->opts.nochanges)
return 0;
- p = kthread_create(bch2_rebalance_thread, c, "bch_rebalance");
- if (IS_ERR(p))
+ p = kthread_create(bch2_rebalance_thread, c, "bch-rebalance/%s", c->name);
+ if (IS_ERR(p)) {
+ bch_err(c, "error creating rebalance thread: %li", PTR_ERR(p));
return PTR_ERR(p);
+ }
get_task_struct(p);
rcu_assign_pointer(c->rebalance.thread, p);
projects / bcachefs-tools-debian / blobdiff