From 2abe542087d9cb1bc7bb8ac7ae262afccbdb7aa6 Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Thu, 21 Jan 2021 15:28:59 -0500 Subject: bcachefs: Persist 64 bit io clocks Originally, bcachefs - going back to bcache - stored, for each bucket, a 16 bit counter corresponding to how long it had been since the bucket was read from. But, this required periodically rescaling counters on every bucket to avoid wraparound. That wasn't an issue in bcache, where we'd perodically rewrite the per bucket metadata all at once, but in bcachefs we're trying to avoid having to walk every single bucket. This patch switches to persisting 64 bit io clocks, corresponding to the 64 bit bucket timestaps introduced in the previous patch with KEY_TYPE_alloc_v2. Signed-off-by: Kent Overstreet Signed-off-by: Kent Overstreet --- fs/bcachefs/alloc_types.h | 24 ------------------------ 1 file changed, 24 deletions(-) (limited to 'fs/bcachefs/alloc_types.h') diff --git a/fs/bcachefs/alloc_types.h b/fs/bcachefs/alloc_types.h index 1abfff5290bc..be164d6108bb 100644 --- a/fs/bcachefs/alloc_types.h +++ b/fs/bcachefs/alloc_types.h @@ -10,30 +10,6 @@ struct ec_bucket_buf; -/* There's two of these clocks, one for reads and one for writes: */ -struct bucket_clock { - /* - * "now" in (read/write) IO time - incremented whenever we do X amount - * of reads or writes. - * - * Goes with the bucket read/write prios: when we read or write to a - * bucket we reset the bucket's prio to the current hand; thus hand - - * prio = time since bucket was last read/written. - * - * The units are some amount (bytes/sectors) of data read/written, and - * the units can change on the fly if we need to rescale to fit - * everything in a u16 - your only guarantee is that the units are - * consistent. - */ - u16 hand; - u16 max_last_io; - - int rw; - - struct io_timer rescale; - struct mutex lock; -}; - enum alloc_reserve { RESERVE_BTREE_MOVINGGC = -2, RESERVE_BTREE = -1, -- cgit v1.2.3-58-ga151