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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <thread.h>
#include <stdlib.h>
#include <errno.h>
#include <strings.h>
#include <tiuser.h>
#include <syslog.h>
#include <zone.h>
#include <sys/priocntl.h>
#include <sys/fxpriocntl.h>
#include <nfs/nfs.h>
#include <nfs/nfssys.h>
#include "thrpool.h"
extern int _nfssys(int, void *);
/*
* Thread to call into the kernel and do work on behalf of NFS.
*/
static void *
svcstart(void *arg)
{
int id = (int)arg;
/*
* Create a kernel worker thread to service
* new incoming requests on a pool.
*/
_nfssys(SVCPOOL_RUN, &id);
/*
* Returned from the kernel, this thread's work is done,
* and it should exit. For new incoming requests,
* svcblock() will spawn another worker thread by
* calling svcstart() again.
*/
thr_exit(NULL);
return (NULL);
}
static void *
svc_rdma_creator(void *arg)
{
struct rdma_svc_args *rsap = (struct rdma_svc_args *)arg;
if (_nfssys(RDMA_SVC_INIT, rsap) < 0) {
if (errno != ENODEV) {
(void) syslog(LOG_INFO, "RDMA transport startup "
"failed with %m");
}
}
free(rsap);
thr_exit(NULL);
return (NULL);
}
/*
* User-space "creator" thread. This thread blocks in the kernel
* until new worker threads need to be created for the service
* pool. On return to userspace, if there is no error, create a
* new thread for the service pool.
*/
static void *
svcblock(void *arg)
{
int id = (int)arg;
/* CONSTCOND */
while (1) {
thread_t tid;
/*
* Call into the kernel, and hang out there
* until a thread needs to be created.
*/
if (_nfssys(SVCPOOL_WAIT, &id) < 0) {
if (errno == ECANCELED || errno == EINTR ||
errno == EBUSY)
/*
* If we get back ECANCELED or EINTR,
* the service pool is exiting, and we
* may as well clean up this thread. If
* EBUSY is returned, there's already a
* thread looping on this pool, so we
* should give up.
*/
break;
else
continue;
}
/*
* User portion of the thread does no real work since
* the svcpool threads actually spend their entire
* lives in the kernel. So, user portion of the thread
* should have the smallest stack possible.
*/
(void) thr_create(NULL, THR_MIN_STACK, svcstart, (void *)id,
THR_BOUND | THR_DETACHED, &tid);
}
thr_exit(NULL);
return (NULL);
}
void
svcsetprio(void)
{
pcinfo_t pcinfo;
pri_t maxupri;
/*
* By default, all threads should be part of the FX scheduler
* class. As nfsd/lockd server threads used to be part of the
* kernel, they're used to being scheduled in the SYS class.
* Userland threads shouldn't be in SYS, but they can be given a
* higher priority by default. This change still renders nfsd/lockd
* managable by an admin by utilizing commands to change scheduling
* manually, or by using resource management tools such as pools
* to associate them with a different scheduling class and segregate
* the workload.
*
* We set the threads' priority to the upper bound for priorities
* in FX. This should be 60, but since the desired action is to
* make nfsd/lockd more important than TS threads, we bow to the
* system's knowledge rather than setting it manually. Furthermore,
* since the SYS class doesn't timeslice, use an "infinite" quantum.
* If anything fails, just log the failure and let the daemon
* default to TS.
*
* The change of scheduling class is expected to fail in a non-global
* zone, so we avoid worrying the zone administrator unnecessarily.
*/
(void) strcpy(pcinfo.pc_clname, "FX");
if (priocntl(0, 0, PC_GETCID, (caddr_t)&pcinfo) != -1) {
maxupri = ((fxinfo_t *)pcinfo.pc_clinfo)->fx_maxupri;
if (priocntl(P_LWPID, P_MYID, PC_SETXPARMS, "FX",
FX_KY_UPRILIM, maxupri, FX_KY_UPRI, maxupri,
FX_KY_TQNSECS, FX_TQINF, NULL) != 0 &&
getzoneid() == GLOBAL_ZONEID)
(void) syslog(LOG_ERR, "Unable to use FX scheduler: "
"%m. Using system default scheduler.");
} else
(void) syslog(LOG_ERR, "Unable to determine parameters "
"for FX scheduler. Using system default scheduler.");
}
int
svcrdma(int id, int versmin, int versmax, int delegation)
{
thread_t tid;
struct rdma_svc_args *rsa;
rsa = (struct rdma_svc_args *)malloc(sizeof (struct rdma_svc_args));
rsa->poolid = (uint32_t)id;
rsa->netid = NULL;
rsa->nfs_versmin = versmin;
rsa->nfs_versmax = versmax;
rsa->delegation = delegation;
/*
* Create a thread to handle RDMA start and stop.
*/
if (thr_create(NULL, THR_MIN_STACK * 2, svc_rdma_creator, (void *)rsa,
THR_BOUND | THR_DETACHED, &tid))
return (1);
return (0);
}
int
svcwait(int id)
{
thread_t tid;
/*
* Create a bound thread to wait for kernel LWPs that
* need to be created. This thread also has little need
* of stackspace, so should be created with that in mind.
*/
if (thr_create(NULL, THR_MIN_STACK * 2, svcblock, (void *)id,
THR_BOUND | THR_DETACHED, &tid))
return (1);
return (0);
}
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