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fscache: Add a tracepoint for cookie use/unuse

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Add a tracepoint to track fscache_use/unuse_cookie().

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/164021588628.640689.12942919367404043608.stgit@warthog.procyon.org.uk/ # v4
This commit is contained in:
David Howells
2021-12-06 15:54:04 +00:00
parent e0484344c0
commit e6435f1e02
2 changed files with 69 additions and 4 deletions
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44
include/trace/events/fscache.h
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@@ -71,6 +71,12 @@ enum fscache_cookie_trace {
fscache_cookie_see_work,
};
enum fscache_active_trace {
fscache_active_use,
fscache_active_use_modify,
fscache_active_unuse,
};
enum fscache_access_trace {
fscache_access_acquire_volume,
fscache_access_acquire_volume_end,
@@ -146,6 +152,11 @@ enum fscache_access_trace {
EM(fscache_cookie_see_withdraw, "- x-wth") \
E_(fscache_cookie_see_work, "- work ")
#define fscache_active_traces \
EM(fscache_active_use, "USE ") \
EM(fscache_active_use_modify, "USE-m ") \
E_(fscache_active_unuse, "UNUSE ")
#define fscache_access_traces \
EM(fscache_access_acquire_volume, "BEGIN acq_vol") \
EM(fscache_access_acquire_volume_end, "END acq_vol") \
@@ -264,6 +275,39 @@ TRACE_EVENT(fscache_cookie,
__entry->ref)
);
TRACE_EVENT(fscache_active,
TP_PROTO(unsigned int cookie_debug_id,
int ref,
int n_active,
int n_accesses,
enum fscache_active_trace why),
TP_ARGS(cookie_debug_id, ref, n_active, n_accesses, why),
TP_STRUCT__entry(
__field(unsigned int, cookie )
__field(int, ref )
__field(int, n_active )
__field(int, n_accesses )
__field(enum fscache_active_trace, why )
),
TP_fast_assign(
__entry->cookie = cookie_debug_id;
__entry->ref = ref;
__entry->n_active = n_active;
__entry->n_accesses = n_accesses;
__entry->why = why;
),
TP_printk("c=%08x %s r=%d a=%d c=%d",
__entry->cookie,
__print_symbolic(__entry->why, fscache_active_traces),
__entry->ref,
__entry->n_accesses,
__entry->n_active)
);
TRACE_EVENT(fscache_access_cache,
TP_PROTO(unsigned int cache_debug_id,
int ref,