Reduce the number of copies done by the kernel when handling retrieval and
delivery of asynchronous messages.
This commit is contained in:
Thomas Veerman
parent
8200e91073
commit
9db2311b22
475
kernel/proc.c
475
kernel/proc.c
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@ -875,12 +875,11 @@ PRIVATE int mini_receive(struct proc * caller_ptr,
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}
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/* Check if there are pending senda(). */
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if (caller_ptr->p_misc_flags & MF_ASYNMSG)
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{
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if (caller_ptr->p_misc_flags & MF_ASYNMSG) {
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if (src_e != ANY)
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r= try_one(proc_addr(src_p), caller_ptr, NULL);
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r = try_one(proc_addr(src_p), caller_ptr, NULL);
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else
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r= try_async(caller_ptr);
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r = try_async(caller_ptr);
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if (r == OK) {
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IPC_STATUS_ADD_CALL(caller_ptr, SENDA);
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@ -1009,7 +1008,7 @@ PUBLIC int mini_notify(
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"(%d/%d, tab 0x%lx)\n",__FILE__,__LINE__, \
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field, caller->p_name, entry, priv(caller)->s_asynsize, priv(caller)->s_asyntab)
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#define A_RETRIEVE(entry, field) \
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#define A_RETR_FLD(entry, field) \
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if(data_copy(caller_ptr->p_endpoint, \
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table_v + (entry)*sizeof(asynmsg_t) + offsetof(struct asynmsg,field),\
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KERNEL, (vir_bytes) &tabent.field, \
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@ -1018,7 +1017,17 @@ field, caller->p_name, entry, priv(caller)->s_asynsize, priv(caller)->s_asyntab)
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return EFAULT; \
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}
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#define A_INSERT(entry, field) \
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#define A_RETR(entry) do { \
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if (data_copy( \
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caller_ptr->p_endpoint, table_v + (entry)*sizeof(asynmsg_t),\
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KERNEL, (vir_bytes) &tabent, \
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sizeof(tabent)) != OK) { \
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ASCOMPLAIN(caller_ptr, entry, "message entry"); \
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return(EFAULT); \
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} \
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} while(0)
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#define A_INSRT_FLD(entry, field) \
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if(data_copy(KERNEL, (vir_bytes) &tabent.field, \
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caller_ptr->p_endpoint, \
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table_v + (entry)*sizeof(asynmsg_t) + offsetof(struct asynmsg,field),\
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@ -1027,179 +1036,122 @@ field, caller->p_name, entry, priv(caller)->s_asynsize, priv(caller)->s_asyntab)
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return EFAULT; \
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}
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#define A_INSRT(entry) do { \
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if (data_copy(KERNEL, (vir_bytes) &tabent, \
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caller_ptr->p_endpoint, table_v + (entry)*sizeof(asynmsg_t),\
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sizeof(tabent)) != OK) { \
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ASCOMPLAIN(caller_ptr, entry, "message entry"); \
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return(EFAULT); \
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} \
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} while(0)
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/*===========================================================================*
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* mini_senda *
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*===========================================================================*/
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PRIVATE int mini_senda(struct proc *caller_ptr, asynmsg_t *table, size_t size)
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{
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int i, dst_p, done, do_notify;
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unsigned flags;
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struct proc *dst_ptr;
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struct priv *privp;
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asynmsg_t tabent;
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const vir_bytes table_v = (vir_bytes) table;
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int r = OK, i, dst_p, done, do_notify;
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unsigned flags;
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endpoint_t dst;
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struct proc *dst_ptr;
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struct priv *privp;
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asynmsg_t tabent;
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const vir_bytes table_v = (vir_bytes) table;
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privp= priv(caller_ptr);
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if (!(privp->s_flags & SYS_PROC))
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{
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printf(
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"mini_senda: warning caller has no privilege structure\n");
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return EPERM;
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}
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privp = priv(caller_ptr);
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if (!(privp->s_flags & SYS_PROC)) {
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printf( "mini_senda: warning caller has no privilege structure\n");
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return(EPERM);
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}
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/* Clear table */
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privp->s_asyntab= -1;
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privp->s_asynsize= 0;
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/* Clear table */
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privp->s_asyntab = -1;
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privp->s_asynsize = 0;
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if (size == 0)
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{
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/* Nothing to do, just return */
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return OK;
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}
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if (size == 0) return(OK); /* Nothing to do, just return */
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/* Limit size to something reasonable. An arbitrary choice is 16
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* times the number of process table entries.
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*
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* (this check has been duplicated in sys_call but is left here
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* as a sanity check)
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*/
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if (size > 16*(NR_TASKS + NR_PROCS))
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{
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return EDOM;
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}
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/* Limit size to something reasonable. An arbitrary choice is 16
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* times the number of process table entries.
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*
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* (this check has been duplicated in sys_call but is left here
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* as a sanity check)
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*/
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if (size > 16*(NR_TASKS + NR_PROCS)) return(EDOM);
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/* Scan the table */
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do_notify= FALSE;
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done= TRUE;
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for (i= 0; i<size; i++)
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{
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/* Scan the table */
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do_notify = FALSE; /* XXX: this doesn't do anything? */
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done = TRUE;
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for (i = 0; i < size; i++) {
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/* Process each entry in the table and store the result in the table.
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* If we're done handling a message, copy the result to the sender. */
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int pending_recv = FALSE;
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/* Read status word */
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A_RETRIEVE(i, flags);
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flags= tabent.flags;
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/* Copy message to kernel */
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A_RETR(i);
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flags = tabent.flags;
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dst = tabent.dst;
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/* Skip empty entries */
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if (flags == 0)
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continue;
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if (flags == 0) continue; /* Skip empty entries */
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/* Check for reserved bits in the flags field */
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if (flags & ~(AMF_VALID|AMF_DONE|AMF_NOTIFY|AMF_NOREPLY) ||
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!(flags & AMF_VALID))
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{
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return EINVAL;
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}
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/* Skip entry if AMF_DONE is already set */
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if (flags & AMF_DONE)
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continue;
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/* Get destination */
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A_RETRIEVE(i, dst);
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if (!isokendpt(tabent.dst, &dst_p))
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{
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/* Bad destination, report the error */
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tabent.result= EDEADSRCDST;
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A_INSERT(i, result);
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tabent.flags= flags | AMF_DONE;
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A_INSERT(i, flags);
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if (flags & AMF_NOTIFY)
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do_notify= 1;
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continue;
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}
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if (iskerneln(dst_p))
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{
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/* Asynchronous sends to the kernel are not allowed */
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tabent.result= ECALLDENIED;
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A_INSERT(i, result);
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tabent.flags= flags | AMF_DONE;
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A_INSERT(i, flags);
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if (flags & AMF_NOTIFY)
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do_notify= 1;
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continue;
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}
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if (!may_send_to(caller_ptr, dst_p))
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{
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/* Send denied by IPC mask */
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tabent.result= ECALLDENIED;
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A_INSERT(i, result);
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tabent.flags= flags | AMF_DONE;
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A_INSERT(i, flags);
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if (flags & AMF_NOTIFY)
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do_notify= 1;
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continue;
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}
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#if 0
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printf("mini_senda: entry[%d]: flags 0x%x dst %d/%d\n",
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i, tabent.flags, tabent.dst, dst_p);
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#endif
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/* 'flags' field must contain only valid bits */
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if (flags & ~(AMF_VALID|AMF_DONE|AMF_NOTIFY|AMF_NOREPLY))
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return(EINVAL);
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if (!(flags & AMF_VALID)) return(EINVAL); /* Must contain message */
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if (flags & AMF_DONE) continue; /* Already done processing */
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if (!isokendpt(tabent.dst, &dst_p))
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r = EDEADSRCDST; /* Bad destination, report the error */
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else if (iskerneln(dst_p))
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r = ECALLDENIED; /* Asyn sends to the kernel are not allowed */
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else if (!may_send_to(caller_ptr, dst_p))
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r = ECALLDENIED; /* Send denied by IPC mask */
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else /* r == OK */
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dst_ptr = proc_addr(dst_p);
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/* RTS_NO_ENDPOINT should be removed */
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if (RTS_ISSET(dst_ptr, RTS_NO_ENDPOINT))
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{
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tabent.result= EDEADSRCDST;
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A_INSERT(i, result);
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tabent.flags= flags | AMF_DONE;
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A_INSERT(i, flags);
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if (flags & AMF_NOTIFY)
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do_notify= TRUE;
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continue;
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}
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/* Check if 'dst' is blocked waiting for this message.
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* If AMF_NOREPLY is set, do not satisfy the receiving part of
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* a SENDREC.
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*/
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if (WILLRECEIVE(dst_ptr, caller_ptr->p_endpoint) &&
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(!(flags & AMF_NOREPLY) ||
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!(dst_ptr->p_misc_flags & MF_REPLY_PEND)))
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{
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/* Destination is indeed waiting for this message. */
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/* Copy message from sender. */
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if(copy_msg_from_user(caller_ptr, &table[i].msg,
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&dst_ptr->p_delivermsg))
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tabent.result = EFAULT;
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else {
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dst_ptr->p_delivermsg.m_source = caller_ptr->p_endpoint;
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dst_ptr->p_misc_flags |= MF_DELIVERMSG;
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IPC_STATUS_ADD_CALL(dst_ptr, SENDA);
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RTS_UNSET(dst_ptr, RTS_RECEIVING);
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tabent.result = OK;
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}
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A_INSERT(i, result);
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tabent.flags= flags | AMF_DONE;
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A_INSERT(i, flags);
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if (flags & AMF_NOTIFY)
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do_notify= 1;
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continue;
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}
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else
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{
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/* Should inform receiver that something is pending */
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dst_ptr->p_misc_flags |= MF_ASYNMSG;
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done= FALSE;
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continue;
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}
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/* XXX: RTS_NO_ENDPOINT should be removed */
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if (r == OK && RTS_ISSET(dst_ptr, RTS_NO_ENDPOINT)) {
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r = EDEADSRCDST;
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}
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if (do_notify)
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printf("mini_senda: should notify caller\n");
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if (!done)
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{
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privp->s_asyntab= (vir_bytes)table;
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privp->s_asynsize= size;
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}
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return OK;
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/* Check if 'dst' is blocked waiting for this message.
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* If AMF_NOREPLY is set, do not satisfy the receiving part of
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* a SENDREC.
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*/
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if (r == OK && WILLRECEIVE(dst_ptr, caller_ptr->p_endpoint) &&
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(!(flags&AMF_NOREPLY) || !(dst_ptr->p_misc_flags&MF_REPLY_PEND))) {
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/* Destination is indeed waiting for this message. */
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dst_ptr->p_delivermsg = tabent.msg;
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dst_ptr->p_delivermsg.m_source = caller_ptr->p_endpoint;
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dst_ptr->p_misc_flags |= MF_DELIVERMSG;
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IPC_STATUS_ADD_CALL(dst_ptr, SENDA);
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RTS_UNSET(dst_ptr, RTS_RECEIVING);
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} else if (r == OK) {
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/* Should inform receiver that something is pending */
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dst_ptr->p_misc_flags |= MF_ASYNMSG;
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pending_recv = TRUE;
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}
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if (!pending_recv) flags |= AMF_DONE; /* Done handling message */
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/* Store results */
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tabent.result = r;
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tabent.flags = flags;
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if (flags & AMF_DONE) {
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if (r != EDEADSRCDST && (flags & AMF_NOTIFY))
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do_notify = TRUE; /* XXX: ? */
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A_INSRT(i); /* Copy results to caller */
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} else
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done = FALSE;
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}
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if (do_notify) printf("mini_senda: should notify caller\n"); /* XXX: ? */
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if (!done) {
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privp->s_asyntab = (vir_bytes) table;
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privp->s_asynsize = size;
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}
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return(OK);
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}
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@ -1209,30 +1161,29 @@ PRIVATE int mini_senda(struct proc *caller_ptr, asynmsg_t *table, size_t size)
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PRIVATE int try_async(caller_ptr)
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struct proc *caller_ptr;
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{
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int r;
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struct priv *privp;
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struct proc *src_ptr;
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int postponed = FALSE;
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int r;
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struct priv *privp;
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struct proc *src_ptr;
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int postponed = FALSE;
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/* Try all privilege structures */
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for (privp = BEG_PRIV_ADDR; privp < END_PRIV_ADDR; ++privp)
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{
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if (privp->s_proc_nr == NONE)
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continue;
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/* Try all privilege structures */
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for (privp = BEG_PRIV_ADDR; privp < END_PRIV_ADDR; ++privp) {
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if (privp->s_proc_nr == NONE)
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continue;
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src_ptr= proc_addr(privp->s_proc_nr);
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src_ptr = proc_addr(privp->s_proc_nr);
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assert(!(caller_ptr->p_misc_flags & MF_DELIVERMSG));
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r= try_one(src_ptr, caller_ptr, &postponed);
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if (r == OK)
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return r;
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}
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assert(!(caller_ptr->p_misc_flags & MF_DELIVERMSG));
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r = try_one(src_ptr, caller_ptr, &postponed);
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if (r == OK)
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return(r);
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}
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/* Nothing found, clear MF_ASYNMSG unless messages were postponed */
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if (postponed == FALSE)
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caller_ptr->p_misc_flags &= ~MF_ASYNMSG;
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/* Nothing found, clear MF_ASYNMSG unless messages were postponed */
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if (postponed == FALSE)
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caller_ptr->p_misc_flags &= ~MF_ASYNMSG;
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return ESRCH;
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return(ESRCH);
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}
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@ -1241,103 +1192,97 @@ struct proc *caller_ptr;
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*===========================================================================*/
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PRIVATE int try_one(struct proc *src_ptr, struct proc *dst_ptr, int *postponed)
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{
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int i, done;
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unsigned flags;
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size_t size;
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endpoint_t dst_e;
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struct priv *privp;
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asynmsg_t tabent;
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vir_bytes table_v;
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struct proc *caller_ptr;
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int r = EAGAIN, i, done, do_notify, pending_recv = FALSE;
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unsigned flags;
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size_t size;
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endpoint_t dst;
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struct proc *caller_ptr;
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struct priv *privp;
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asynmsg_t tabent;
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vir_bytes table_v;
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privp= priv(src_ptr);
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privp = priv(src_ptr);
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if (!(privp->s_flags & SYS_PROC)) return(EPERM);
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size = privp->s_asynsize;
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table_v = privp->s_asyntab;
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/* Basic validity checks */
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if (privp->s_id == USER_PRIV_ID) return EAGAIN;
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if (privp->s_asynsize == 0) return EAGAIN;
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if (!may_send_to(src_ptr, proc_nr(dst_ptr))) return EAGAIN;
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/* Clear table */
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privp->s_asyntab = -1;
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privp->s_asynsize = 0;
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size= privp->s_asynsize;
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table_v = privp->s_asyntab;
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caller_ptr = src_ptr;
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if (size == 0) return(EAGAIN);
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if (!may_send_to(src_ptr, proc_nr(dst_ptr))) return(EAGAIN);
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dst_e= dst_ptr->p_endpoint;
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caller_ptr = src_ptr;
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/* Scan the table */
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done= TRUE;
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for (i= 0; i<size; i++)
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{
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/* Read status word */
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A_RETRIEVE(i, flags);
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flags= tabent.flags;
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/* Scan the table */
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do_notify = FALSE; /* XXX: this doesn't do anything? */
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done = TRUE;
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for (i = 0; i < size; i++) {
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/* Process each entry in the table and store the result in the table.
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* If we're done handling a message, copy the result to the sender.
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* Some checks done in mini_senda are duplicated here, as the sender
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* could've altered the contents of the table in the mean time.
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*/
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/* Skip empty entries */
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if (flags == 0)
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{
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continue;
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}
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/* Copy message to kernel */
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A_RETR(i);
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flags = tabent.flags;
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dst = tabent.dst;
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/* Check for reserved bits in the flags field */
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if (flags & ~(AMF_VALID|AMF_DONE|AMF_NOTIFY|AMF_NOREPLY) ||
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!(flags & AMF_VALID))
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{
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printf("try_one: bad bits in table\n");
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privp->s_asynsize= 0;
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return EINVAL;
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}
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if (flags == 0) continue; /* Skip empty entries */
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/* Skip entry is AMF_DONE is already set */
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if (flags & AMF_DONE)
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{
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continue;
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}
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/* 'flags' field must contain only valid bits */
|
||||
if (flags & ~(AMF_VALID|AMF_DONE|AMF_NOTIFY|AMF_NOREPLY))
|
||||
return(EINVAL);
|
||||
if (!(flags & AMF_VALID)) return(EINVAL); /* Must contain message */
|
||||
if (flags & AMF_DONE) continue; /* Already done processing */
|
||||
|
||||
/* Clear done. We are done when all entries are either empty
|
||||
* or done at the start of the call.
|
||||
*/
|
||||
done= FALSE;
|
||||
/* Clear done flag. The sender is done sending when all messages in the
|
||||
* table are marked done or empty. However, we will know that only
|
||||
* the next time we enter this function or when the sender decides to
|
||||
* send additional asynchronous messages and manages to deliver them
|
||||
* all.
|
||||
*/
|
||||
done = FALSE;
|
||||
|
||||
/* Get destination */
|
||||
A_RETRIEVE(i, dst);
|
||||
/* Message must be directed at receiving end */
|
||||
if (dst != dst_ptr->p_endpoint) continue;
|
||||
|
||||
if (tabent.dst != dst_e)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
/* If AMF_NOREPLY is set, then this message is not a reply to a
|
||||
* SENDREC and thus should not satisfy the receiving part of the
|
||||
* SENDREC. This message is to be delivered later.
|
||||
*/
|
||||
if ((flags & AMF_NOREPLY) && (dst_ptr->p_misc_flags & MF_REPLY_PEND)) {
|
||||
if (postponed != NULL)
|
||||
*postponed = TRUE;
|
||||
|
||||
/* If AMF_NOREPLY is set, do not satisfy the receiving part of
|
||||
* a SENDREC. Do not unset MF_ASYNMSG later because of this,
|
||||
* though: this message is still to be delivered later.
|
||||
*/
|
||||
if ((flags & AMF_NOREPLY) &&
|
||||
(dst_ptr->p_misc_flags & MF_REPLY_PEND))
|
||||
{
|
||||
if (postponed != NULL)
|
||||
*postponed = TRUE;
|
||||
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Deliver message */
|
||||
A_RETRIEVE(i, msg);
|
||||
dst_ptr->p_delivermsg = tabent.msg;
|
||||
dst_ptr->p_delivermsg.m_source = src_ptr->p_endpoint;
|
||||
dst_ptr->p_misc_flags |= MF_DELIVERMSG;
|
||||
|
||||
tabent.result = OK;
|
||||
A_INSERT(i, result);
|
||||
tabent.flags= flags | AMF_DONE;
|
||||
A_INSERT(i, flags);
|
||||
|
||||
if (flags & AMF_NOTIFY)
|
||||
{
|
||||
printf("try_one: should notify caller\n");
|
||||
}
|
||||
return OK;
|
||||
continue;
|
||||
}
|
||||
if (done)
|
||||
privp->s_asynsize= 0;
|
||||
return EAGAIN;
|
||||
|
||||
/* Destination is ready to receive the message; deliver it */
|
||||
dst_ptr->p_delivermsg = tabent.msg;
|
||||
dst_ptr->p_delivermsg.m_source = src_ptr->p_endpoint;
|
||||
dst_ptr->p_misc_flags |= MF_DELIVERMSG;
|
||||
|
||||
/* Store results for sender */
|
||||
tabent.result = OK;
|
||||
tabent.flags = flags | AMF_DONE;
|
||||
if (flags & AMF_NOTIFY) do_notify = TRUE; /* XXX: ? */
|
||||
A_INSRT(i); /* Copy results to sender */
|
||||
|
||||
r = OK;
|
||||
break;
|
||||
}
|
||||
|
||||
if (do_notify) printf("mini_senda: should notify caller\n"); /* XXX: ? */
|
||||
|
||||
if (!done) {
|
||||
privp->s_asyntab = table_v;
|
||||
privp->s_asynsize = size;
|
||||
}
|
||||
|
||||
return(r);
|
||||
}
|
||||
|
||||
/*===========================================================================*
|
||||
|
|
|
|||
Loading…
Reference in a new issue