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afs: Add some callback management tracepoints

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Add a couple of tracepoints to track callback management:

 (1) afs_cb_miss - Logs when we were unable to apply a callback, either due
     to the inode being discarded or due to a competing thread applying a
     callback first.

 (2) afs_cb_break - Logs when we attempted to clear the noted callback
     promise, either due to the server explicitly breaking the callback,
     the callback promise lapsing or a local event obsoleting it.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2019-06-20 18:12:16 +01:00
parent fa59f52f5b
commit 051d25250b
5 changed files with 97 additions and 17 deletions
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69
include/trace/events/afs.h
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@@ -195,6 +195,17 @@ enum afs_flock_operation {
afs_flock_op_wake,
};
enum afs_cb_break_reason {
afs_cb_break_no_break,
afs_cb_break_for_callback,
afs_cb_break_for_deleted,
afs_cb_break_for_lapsed,
afs_cb_break_for_unlink,
afs_cb_break_for_vsbreak,
afs_cb_break_for_volume_callback,
afs_cb_break_for_zap,
};
#endif /* end __AFS_DECLARE_TRACE_ENUMS_ONCE_ONLY */
/*
@@ -374,6 +385,16 @@ enum afs_flock_operation {
EM(afs_flock_op_unlock, "UNLOCK ") \
E_(afs_flock_op_wake, "WAKE ")
#define afs_cb_break_reasons \
EM(afs_cb_break_no_break, "no-break") \
EM(afs_cb_break_for_callback, "break-cb") \
EM(afs_cb_break_for_deleted, "break-del") \
EM(afs_cb_break_for_lapsed, "break-lapsed") \
EM(afs_cb_break_for_unlink, "break-unlink") \
EM(afs_cb_break_for_vsbreak, "break-vs") \
EM(afs_cb_break_for_volume_callback, "break-v-cb") \
E_(afs_cb_break_for_zap, "break-zap")
/*
* Export enum symbols via userspace.
*/
@@ -392,6 +413,7 @@ afs_io_errors;
afs_file_errors;
afs_flock_types;
afs_flock_operations;
afs_cb_break_reasons;
/*
* Now redefine the EM() and E_() macros to map the enums to the strings that
@@ -1171,6 +1193,53 @@ TRACE_EVENT(afs_get_tree,
__entry->cell, __entry->volume, __entry->vid)
);
TRACE_EVENT(afs_cb_break,
TP_PROTO(struct afs_fid *fid, unsigned int cb_break,
enum afs_cb_break_reason reason, bool skipped),
TP_ARGS(fid, cb_break, reason, skipped),
TP_STRUCT__entry(
__field_struct(struct afs_fid, fid )
__field(unsigned int, cb_break )
__field(enum afs_cb_break_reason, reason )
__field(bool, skipped )
),
TP_fast_assign(
__entry->fid = *fid;
__entry->cb_break = cb_break;
__entry->reason = reason;
__entry->skipped = skipped;
),
TP_printk("%llx:%llx:%x b=%x s=%u %s",
__entry->fid.vid, __entry->fid.vnode, __entry->fid.unique,
__entry->cb_break,
__entry->skipped,
__print_symbolic(__entry->reason, afs_cb_break_reasons))
);
TRACE_EVENT(afs_cb_miss,
TP_PROTO(struct afs_fid *fid, enum afs_cb_break_reason reason),
TP_ARGS(fid, reason),
TP_STRUCT__entry(
__field_struct(struct afs_fid, fid )
__field(enum afs_cb_break_reason, reason )
),
TP_fast_assign(
__entry->fid = *fid;
__entry->reason = reason;
),
TP_printk(" %llx:%llx:%x %s",
__entry->fid.vid, __entry->fid.vnode, __entry->fid.unique,
__print_symbolic(__entry->reason, afs_cb_break_reasons))
);
#endif /* _TRACE_AFS_H */
/* This part must be outside protection */