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bcachefs: Improve trans_blocked_journal_reclaim tracepoint

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include information about the state of the btree key cache

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-08-10 14:31:17 -04:00
parent 7254555c44
commit 790666c8ac
3 changed files with 33 additions and 4 deletions
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9
fs/bcachefs/btree_key_cache.h
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@ -11,13 +11,18 @@ static inline size_t bch2_nr_btree_keys_need_flush(struct bch_fs *c)
return max_t(ssize_t, 0, nr_dirty - max_dirty); return max_t(ssize_t, 0, nr_dirty - max_dirty);
} }
static inline bool bch2_btree_key_cache_must_wait(struct bch_fs *c) static inline ssize_t __bch2_btree_key_cache_must_wait(struct bch_fs *c)
{ {
size_t nr_dirty = atomic_long_read(&c->btree_key_cache.nr_dirty); size_t nr_dirty = atomic_long_read(&c->btree_key_cache.nr_dirty);
size_t nr_keys = atomic_long_read(&c->btree_key_cache.nr_keys); size_t nr_keys = atomic_long_read(&c->btree_key_cache.nr_keys);
size_t max_dirty = 4096 + (nr_keys * 3) / 4; size_t max_dirty = 4096 + (nr_keys * 3) / 4;
return nr_dirty > max_dirty; return nr_dirty - max_dirty;
}
static inline bool bch2_btree_key_cache_must_wait(struct bch_fs *c)
{
return __bch2_btree_key_cache_must_wait(c) > 0;
} }
static inline bool bch2_btree_key_cache_wait_done(struct bch_fs *c) static inline bool bch2_btree_key_cache_wait_done(struct bch_fs *c)

1
fs/bcachefs/trace.c
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@ -4,6 +4,7 @@
#include "buckets.h" #include "buckets.h"
#include "btree_cache.h" #include "btree_cache.h"
#include "btree_iter.h" #include "btree_iter.h"
#include "btree_key_cache.h"
#include "btree_locking.h" #include "btree_locking.h"
#include "btree_update_interior.h" #include "btree_update_interior.h"
#include "keylist.h" #include "keylist.h"

27
fs/bcachefs/trace.h
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@ -988,10 +988,33 @@ TRACE_EVENT(trans_restart_split_race,
__entry->u64s_remaining) __entry->u64s_remaining)
); );
DEFINE_EVENT(transaction_event, trans_blocked_journal_reclaim, TRACE_EVENT(trans_blocked_journal_reclaim,
TP_PROTO(struct btree_trans *trans, TP_PROTO(struct btree_trans *trans,
unsigned long caller_ip), unsigned long caller_ip),
TP_ARGS(trans, caller_ip) TP_ARGS(trans, caller_ip),
TP_STRUCT__entry(
__array(char, trans_fn, 32 )
__field(unsigned long, caller_ip )
__field(unsigned long, key_cache_nr_keys )
__field(unsigned long, key_cache_nr_dirty )
__field(long, must_wait )
),
TP_fast_assign(
strscpy(__entry->trans_fn, trans->fn, sizeof(__entry->trans_fn));
__entry->caller_ip = caller_ip;
__entry->key_cache_nr_keys = atomic_long_read(&trans->c->btree_key_cache.nr_keys);
__entry->key_cache_nr_dirty = atomic_long_read(&trans->c->btree_key_cache.nr_dirty);
__entry->must_wait = __bch2_btree_key_cache_must_wait(trans->c);
),
TP_printk("%s %pS key cache keys %lu dirty %lu must_wait %li",
__entry->trans_fn, (void *) __entry->caller_ip,
__entry->key_cache_nr_keys,
__entry->key_cache_nr_dirty,
__entry->must_wait)
); );
TRACE_EVENT(trans_restart_journal_preres_get, TRACE_EVENT(trans_restart_journal_preres_get,