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bcachefs: Add an option to control btree node prefetching

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-01-03 15:21:45 -05:00
parent 8a0dda6fd6
commit 49a5192c0e
2 changed files with 11 additions and 3 deletions
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6
fs/bcachefs/btree_iter.c
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@ -897,7 +897,8 @@ static noinline int btree_node_iter_and_journal_peek(struct btree_trans *trans,
bch2_bkey_buf_reassemble(out, c, k);
if (flags & BTREE_ITER_PREFETCH)
if ((flags & BTREE_ITER_PREFETCH) &&
c->opts.btree_node_prefetch)
ret = btree_path_prefetch_j(trans, path, &jiter);
bch2_btree_and_journal_iter_exit(&jiter);
@ -929,7 +930,8 @@ static __always_inline int btree_path_down(struct btree_trans *trans,
bch2_bkey_buf_unpack(&tmp, c, l->b,
bch2_btree_node_iter_peek(&l->iter, l->b));
if (flags & BTREE_ITER_PREFETCH) {
if ((flags & BTREE_ITER_PREFETCH) &&
c->opts.btree_node_prefetch) {
ret = btree_path_prefetch(trans, path);
if (ret)
goto err;

8
fs/bcachefs/opts.h
View File

@ -458,7 +458,13 @@ enum fsck_err_opts {
OPT_UINT(0, BCH_REPLICAS_MAX), \
BCH2_NO_SB_OPT, 1, \
"n", "Data written to this device will be considered\n"\
"to have already been replicated n times")
"to have already been replicated n times") \
x(btree_node_prefetch, u8, \
OPT_FS|OPT_MOUNT|OPT_RUNTIME, \
OPT_BOOL(), \
BCH2_NO_SB_OPT, true, \
NULL, "BTREE_ITER_PREFETCH casuse btree nodes to be\n"\
" prefetched sequentially")
struct bch_opts {
#define x(_name, _bits, ...) unsigned _name##_defined:1;