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bcachefs: Change copygc to consider bucket fragmentation

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When devices have different sized buckets this is more correct.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-08-12 13:49:09 -04:00 committed by Kent Overstreet
parent 1421bea38a
commit 142cbdff9b
2 changed files with 12 additions and 9 deletions
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1
fs/bcachefs/buckets_types.h
View file

@ -123,6 +123,7 @@ struct disk_reservation {
struct copygc_heap_entry {
u8 dev;
u8 gen;
u16 fragmentation;
u32 sectors;
u64 offset;
};

20
fs/bcachefs/movinggc.c
View file

@ -44,13 +44,6 @@
#define COPYGC_BUCKETS_PER_ITER(ca) \
((ca)->free[RESERVE_MOVINGGC].size / 2)
static inline int sectors_used_cmp(copygc_heap *heap,
struct copygc_heap_entry l,
struct copygc_heap_entry r)
{
return cmp_int(l.sectors, r.sectors);
}
static int bucket_offset_cmp(const void *_l, const void *_r, size_t size)
{
const struct copygc_heap_entry *l = _l;
@ -123,6 +116,13 @@ static bool have_copygc_reserve(struct bch_dev *ca)
return ret;
}
static inline int fragmentation_cmp(copygc_heap *heap,
struct copygc_heap_entry l,
struct copygc_heap_entry r)
{
return cmp_int(l.fragmentation, r.fragmentation);
}
static int bch2_copygc(struct bch_fs *c)
{
copygc_heap *h = &c->copygc_heap;
@ -180,10 +180,12 @@ static int bch2_copygc(struct bch_fs *c)
e = (struct copygc_heap_entry) {
.dev = dev_idx,
.gen = m.gen,
.fragmentation = bucket_sectors_used(m) * (1U << 15)
/ ca->mi.bucket_size,
.sectors = bucket_sectors_used(m),
.offset = bucket_to_sector(ca, b),
};
heap_add_or_replace(h, e, -sectors_used_cmp, NULL);
heap_add_or_replace(h, e, -fragmentation_cmp, NULL);
}
up_read(&ca->bucket_lock);
}
@ -197,7 +199,7 @@ static int bch2_copygc(struct bch_fs *c)
sectors_to_move += i->sectors;
while (sectors_to_move > sectors_reserved) {
BUG_ON(!heap_pop(h, e, -sectors_used_cmp, NULL));
BUG_ON(!heap_pop(h, e, -fragmentation_cmp, NULL));
sectors_to_move -= e.sectors;
}