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authorTrond Myklebust <trondmy@gmail.com>2020-03-01 18:21:44 -0500
committerChuck Lever <chuck.lever@oracle.com>2020-03-16 12:04:34 -0400
commit78a947f50aaabd8d49e634a84f451c0933af853a (patch)
tree6b614627f325ac1a0b4b2153d2a076318a12424f /net/sunrpc/cache.c
parent277f27e2f27752cd1a7901443d72e908ddea8a2e (diff)
sunrpc: Add tracing for cache events
Add basic tracing for debugging the sunrpc cache events. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'net/sunrpc/cache.c')
-rw-r--r--net/sunrpc/cache.c36
1 files changed, 27 insertions, 9 deletions
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);