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Commit c05988cd authored by Chuck Lever's avatar Chuck Lever Committed by Trond Myklebust
Browse files

SUNRPC: Add documenting comments in net/sunrpc/timer.c 



Clean up: provide documenting comments for the functions in
net/sunrpc/timer.c.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 9dc3b095

net/sunrpc/timer.c

+29 −16
Original line number Diff line number Diff line
@@ -25,8 +25,13 @@ 
#define RPC_RTO_INIT (HZ/5)

#define RPC_RTO_MIN (HZ/10)



void

rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo)

/**

 * rpc_init_rtt - Initialize an RPC RTT estimator context

 * @rt: context to initialize

 * @timeo: initial timeout value, in jiffies

 *

 */

void rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo)

{

	unsigned long init = 0;

	unsigned i;
@@ -43,12 +48,16 @@ rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo) 
}

EXPORT_SYMBOL_GPL(rpc_init_rtt);



/*

/**

 * rpc_update_rtt - Update an RPC RTT estimator context

 * @rt: context to update

 * @timer: timer array index (request type)

 * @m: recent actual RTT, in jiffies

 *

 * NB: When computing the smoothed RTT and standard deviation,

 *     be careful not to produce negative intermediate results.

 */

void

rpc_update_rtt(struct rpc_rtt *rt, unsigned timer, long m)

void rpc_update_rtt(struct rpc_rtt *rt, unsigned timer, long m)

{

	long *srtt, *sdrtt;
@@ -79,21 +88,25 @@ rpc_update_rtt(struct rpc_rtt *rt, unsigned timer, long m) 
}

EXPORT_SYMBOL_GPL(rpc_update_rtt);



/*

 * Estimate rto for an nfs rpc sent via. an unreliable datagram.

 * Use the mean and mean deviation of rtt for the appropriate type of rpc

 * for the frequent rpcs and a default for the others.

 * The justification for doing "other" this way is that these rpcs

 * happen so infrequently that timer est. would probably be stale.

 * Also, since many of these rpcs are

 * non-idempotent, a conservative timeout is desired.

/**

 * rpc_calc_rto - Provide an estimated timeout value

 * @rt: context to use for calculation

 * @timer: timer array index (request type)

 *

 * Estimate RTO for an NFS RPC sent via an unreliable datagram.  Use

 * the mean and mean deviation of RTT for the appropriate type of RPC

 * for frequently issued RPCs, and a fixed default for the others.

 *

 * The justification for doing "other" this way is that these RPCs

 * happen so infrequently that timer estimation would probably be

 * stale.  Also, since many of these RPCs are non-idempotent, a

 * conservative timeout is desired.

 *

 * getattr, lookup,

 * read, write, commit     - A+4D

 * other                   - timeo

 */



unsigned long

rpc_calc_rto(struct rpc_rtt *rt, unsigned timer)

unsigned long rpc_calc_rto(struct rpc_rtt *rt, unsigned timer)

{

	unsigned long res;