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rxrpc: Add a tracepoint to track rxrpc_peer refcounting

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Add a tracepoint to track reference counting on the rxrpc_peer struct.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2018-03-30 21:05:38 +01:00
parent 31f5f9a169
commit 1159d4b496
4 changed files with 110 additions and 22 deletions
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65
net/rxrpc/peer_object.c
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@@ -386,9 +386,54 @@ struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
}
/*
* Discard a ref on a remote peer record.
* Get a ref on a peer record.
*/
void __rxrpc_put_peer(struct rxrpc_peer *peer)
struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
{
const void *here = __builtin_return_address(0);
int n;
n = atomic_inc_return(&peer->usage);
trace_rxrpc_peer(peer, rxrpc_peer_got, n, here);
return peer;
}
/*
* Get a ref on a peer record unless its usage has already reached 0.
*/
struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
{
const void *here = __builtin_return_address(0);
if (peer) {
int n = __atomic_add_unless(&peer->usage, 1, 0);
if (n > 0)
trace_rxrpc_peer(peer, rxrpc_peer_got, n + 1, here);
else
peer = NULL;
}
return peer;
}
/*
* Queue a peer record. This passes the caller's ref to the workqueue.
*/
void __rxrpc_queue_peer_error(struct rxrpc_peer *peer)
{
const void *here = __builtin_return_address(0);
int n;
n = atomic_read(&peer->usage);
if (rxrpc_queue_work(&peer->error_distributor))
trace_rxrpc_peer(peer, rxrpc_peer_queued_error, n, here);
else
rxrpc_put_peer(peer);
}
/*
* Discard a peer record.
*/
static void __rxrpc_put_peer(struct rxrpc_peer *peer)
{
struct rxrpc_net *rxnet = peer->local->rxnet;
@@ -402,6 +447,22 @@ void __rxrpc_put_peer(struct rxrpc_peer *peer)
kfree_rcu(peer, rcu);
}
/*
* Drop a ref on a peer record.
*/
void rxrpc_put_peer(struct rxrpc_peer *peer)
{
const void *here = __builtin_return_address(0);
int n;
if (peer) {
n = atomic_dec_return(&peer->usage);
trace_rxrpc_peer(peer, rxrpc_peer_put, n, here);
if (n == 0)
__rxrpc_put_peer(peer);
}
}
/**
* rxrpc_kernel_get_peer - Get the peer address of a call
* @sock: The socket on which the call is in progress.