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scoutfs: add coarse lock lifetime tracing

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Add tracepoints for allocated lock structs entering the tree and finally
being freed.  This gives visibility into the lifetime of locks without
using much higher frequency per-operation tracing that blow out other
events.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2017-11-10 14:55:42 -08:00
committed by Mark Fasheh
parent 7767a8a48e
commit c292a3ceb8
2 changed files with 12 additions and 0 deletions
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2
kmod/src/lock.c
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@@ -128,6 +128,7 @@ static void put_scoutfs_lock(struct super_block *sb, struct scoutfs_lock *lock)
BUG_ON(!lock->refcnt);
refs = --lock->refcnt;
if (!refs) {
trace_scoutfs_lock_free(sb, lock);
rb_erase(&lock->node, &linfo->lock_tree);
list_del(&lock->lru_entry);
spin_unlock(&linfo->lock);
@@ -312,6 +313,7 @@ search:
new = NULL;
found->refcnt = 1; /* Freed by shrinker or on umount */
found->sequence = ++linfo->seq_cnt;
trace_scoutfs_lock_rb_insert(sb, found);
rb_link_node(&found->node, parent, node);
rb_insert_color(&found->node, &linfo->lock_tree);
scoutfs_inc_counter(sb, lock_alloc);

10
kmod/src/scoutfs_trace.h
View File

@@ -1662,6 +1662,16 @@ DEFINE_EVENT(scoutfs_lock_class, shrink_lock_tree,
TP_ARGS(sb, lck)
);
DEFINE_EVENT(scoutfs_lock_class, scoutfs_lock_rb_insert,
TP_PROTO(struct super_block *sb, struct scoutfs_lock *lck),
TP_ARGS(sb, lck)
);
DEFINE_EVENT(scoutfs_lock_class, scoutfs_lock_free,
TP_PROTO(struct super_block *sb, struct scoutfs_lock *lck),
TP_ARGS(sb, lck)
);
DECLARE_EVENT_CLASS(scoutfs_seg_class,
TP_PROTO(struct scoutfs_segment *seg),
TP_ARGS(seg),