diff options
| -rw-r--r-- | include/trace/events/sunrpc.h | 33 | ||||
| -rw-r--r-- | net/sunrpc/cache.c | 36 |
2 files changed, 60 insertions, 9 deletions
diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h index 1577223add43..ffd2215950dc 100644 --- a/include/trace/events/sunrpc.h +++ b/include/trace/events/sunrpc.h @@ -1335,6 +1335,39 @@ DECLARE_EVENT_CLASS(svc_deferred_event, DEFINE_SVC_DEFERRED_EVENT(drop); DEFINE_SVC_DEFERRED_EVENT(revisit); +DECLARE_EVENT_CLASS(cache_event, + TP_PROTO( + const struct cache_detail *cd, + const struct cache_head *h + ), + + TP_ARGS(cd, h), + + TP_STRUCT__entry( + __field(const struct cache_head *, h) + __string(name, cd->name) + ), + + TP_fast_assign( + __entry->h = h; + __assign_str(name, cd->name); + ), + + TP_printk("cache=%s entry=%p", __get_str(name), __entry->h) +); +#define DEFINE_CACHE_EVENT(name) \ + DEFINE_EVENT(cache_event, name, \ + TP_PROTO( \ + const struct cache_detail *cd, \ + const struct cache_head *h \ + ), \ + TP_ARGS(cd, h)) +DEFINE_CACHE_EVENT(cache_entry_expired); +DEFINE_CACHE_EVENT(cache_entry_upcall); +DEFINE_CACHE_EVENT(cache_entry_update); +DEFINE_CACHE_EVENT(cache_entry_make_negative); +DEFINE_CACHE_EVENT(cache_entry_no_listener); + #endif /* _TRACE_SUNRPC_H */ #include <trace/define_trace.h> diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index cd76ef2d26b8..af0ddd28b081 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -32,6 +32,7 @@ #include <linux/sunrpc/cache.h> #include <linux/sunrpc/stats.h> #include <linux/sunrpc/rpc_pipe_fs.h> +#include <trace/events/sunrpc.h> #include "netns.h" #define RPCDBG_FACILITY RPCDBG_CACHE @@ -120,6 +121,7 @@ static struct cache_head *sunrpc_cache_add_entry(struct cache_detail *detail, if (test_bit(CACHE_VALID, &tmp->flags) && cache_is_expired(detail, tmp)) { sunrpc_begin_cache_remove_entry(tmp, detail); + trace_cache_entry_expired(detail, tmp); freeme = tmp; break; } @@ -176,6 +178,25 @@ static void cache_fresh_unlocked(struct cache_head *head, } } +static void cache_make_negative(struct cache_detail *detail, + struct cache_head *h) +{ + set_bit(CACHE_NEGATIVE, &h->flags); + trace_cache_entry_make_negative(detail, h); +} + +static void cache_entry_update(struct cache_detail *detail, + struct cache_head *h, + struct cache_head *new) +{ + if (!test_bit(CACHE_NEGATIVE, &new->flags)) { + detail->update(h, new); + trace_cache_entry_update(detail, h); + } else { + cache_make_negative(detail, h); + } +} + struct cache_head *sunrpc_cache_update(struct cache_detail *detail, struct cache_head *new, struct cache_head *old, int hash) { @@ -188,10 +209,7 @@ struct cache_head *sunrpc_cache_update(struct cache_detail *detail, if (!test_bit(CACHE_VALID, &old->flags)) { spin_lock(&detail->hash_lock); if (!test_bit(CACHE_VALID, &old->flags)) { - if (test_bit(CACHE_NEGATIVE, &new->flags)) - set_bit(CACHE_NEGATIVE, &old->flags); - else - detail->update(old, new); + cache_entry_update(detail, old, new); cache_fresh_locked(old, new->expiry_time, detail); spin_unlock(&detail->hash_lock); cache_fresh_unlocked(old, detail); @@ -209,10 +227,7 @@ struct cache_head *sunrpc_cache_update(struct cache_detail *detail, detail->init(tmp, old); spin_lock(&detail->hash_lock); - if (test_bit(CACHE_NEGATIVE, &new->flags)) - set_bit(CACHE_NEGATIVE, &tmp->flags); - else - detail->update(tmp, new); + cache_entry_update(detail, tmp, new); hlist_add_head(&tmp->cache_list, &detail->hash_table[hash]); detail->entries++; cache_get(tmp); @@ -254,7 +269,7 @@ static int try_to_negate_entry(struct cache_detail *detail, struct cache_head *h spin_lock(&detail->hash_lock); rv = cache_is_valid(h); if (rv == -EAGAIN) { - set_bit(CACHE_NEGATIVE, &h->flags); + cache_make_negative(detail, h); cache_fresh_locked(h, seconds_since_boot()+CACHE_NEW_EXPIRY, detail); rv = -ENOENT; @@ -460,6 +475,7 @@ static int cache_clean(void) continue; sunrpc_begin_cache_remove_entry(ch, current_detail); + trace_cache_entry_expired(current_detail, ch); rv = 1; break; } @@ -1215,6 +1231,7 @@ static int cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h) if (test_bit(CACHE_PENDING, &h->flags)) { crq->item = cache_get(h); list_add_tail(&crq->q.list, &detail->queue); + trace_cache_entry_upcall(detail, h); } else /* Lost a race, no longer PENDING, so don't enqueue */ ret = -EAGAIN; @@ -1240,6 +1257,7 @@ int sunrpc_cache_pipe_upcall_timeout(struct cache_detail *detail, { if (!cache_listeners_exist(detail)) { warn_no_listener(detail); + trace_cache_entry_no_listener(detail, h); return -EINVAL; } return sunrpc_cache_pipe_upcall(detail, h); |