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| author | Kent Overstreet <kent.overstreet@linux.dev> | 2022-12-05 16:24:19 +0100 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-10-22 23:09:53 +0200 |
| commit | 80c33085783656617d0d07e1bc9fba70a592ce5c (patch) | |
| tree | 2f2a6b43a3b6caab092c4f74df9f5a582e1a60b0 /fs/bcachefs/trace.h | |
| parent | bcachefs: Use btree write buffer for LRU btree (diff) | |
| download | linux-80c33085783656617d0d07e1bc9fba70a592ce5c.tar.xz linux-80c33085783656617d0d07e1bc9fba70a592ce5c.zip | |
bcachefs: Fragmentation LRU
Now that we have much more efficient updates to the LRU btree, this
patch adds a new LRU that indexes buckets by fragmentation.
This means copygc no longer has to scan every bucket to find buckets
that need to be evacuated.
Changes:
- A new field in bch_alloc_v4, fragmentation_lru - this corresponds to
the bucket's position in the fragmentation LRU. We add a new field
for this instead of calculating it as needed because we may make the
fragmentation LRU optional; this field indicates whether a bucket is
on the fragmentation LRU.
Also, zoned devices will introduce variable bucket sizes; explicitly
recording the LRU position will be safer for them.
- A new copygc path for using the fragmentation LRU instead of
scanning every bucket and building up an in-memory heap.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/trace.h')
| -rw-r--r-- | fs/bcachefs/trace.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/bcachefs/trace.h b/fs/bcachefs/trace.h index 24dd2defe7c7..30b10908ced0 100644 --- a/fs/bcachefs/trace.h +++ b/fs/bcachefs/trace.h @@ -723,8 +723,8 @@ TRACE_EVENT(move_data, TRACE_EVENT(evacuate_bucket, TP_PROTO(struct bch_fs *c, struct bpos *bucket, unsigned sectors, unsigned bucket_size, - int ret), - TP_ARGS(c, bucket, sectors, bucket_size, ret), + u64 fragmentation, int ret), + TP_ARGS(c, bucket, sectors, bucket_size, fragmentation, ret), TP_STRUCT__entry( __field(dev_t, dev ) @@ -732,6 +732,7 @@ TRACE_EVENT(evacuate_bucket, __field(u64, bucket ) __field(u32, sectors ) __field(u32, bucket_size ) + __field(u64, fragmentation ) __field(int, ret ) ), @@ -741,14 +742,15 @@ TRACE_EVENT(evacuate_bucket, __entry->bucket = bucket->offset; __entry->sectors = sectors; __entry->bucket_size = bucket_size; + __entry->fragmentation = fragmentation; __entry->ret = ret; ), - TP_printk("%d,%d %llu:%llu sectors %u/%u ret %i", + TP_printk("%d,%d %llu:%llu sectors %u/%u fragmentation %llu ret %i", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->member, __entry->bucket, __entry->sectors, __entry->bucket_size, - __entry->ret) + __entry->fragmentation, __entry->ret) ); TRACE_EVENT(copygc, |