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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 (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
*/
#include <sys/pool.h>
#include <sys/pool_impl.h>
#include <sys/pool_pset.h>
#include <sys/id_space.h>
#include <sys/mutex.h>
#include <sys/nvpair.h>
#include <sys/cpuvar.h>
#include <sys/errno.h>
#include <sys/cmn_err.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/fss.h>
#include <sys/class.h>
#include <sys/exacct.h>
#include <sys/utsname.h>
#include <sys/procset.h>
#include <sys/atomic.h>
#include <sys/zone.h>
#include <sys/policy.h>
#include <sys/schedctl.h>
#include <sys/taskq.h>
/*
* RESOURCE POOLS
*
* The resource pools facility brings together process-bindable resource into
* a common abstraction called a pool. Processor sets and other entities can
* be configured, grouped, and labelled such that workload components can be
* associated with a subset of a system's total resources.
*
* When disabled, the pools facility is "invisible". All processes belong
* to the same pool (pool_default), and processor sets can be managed through
* the old pset() system call. When enabled, processor sets can only be
* managed via the pools facility. New pools can be created and associated
* with processor sets. Processes can be bound to pools which have non-empty
* resource sets.
*
* Locking: pool_lock() protects global pools state and must be called
* before modifying the configuration, or when taking a snapshot of the
* configuration. If pool_lock_intr() is used, the operation may be
* interrupted by a signal or a request.
*
* To prevent processes from being rebound between pools while they are
* the middle of an operation which affects resource set bindings, such
* operations must be surrounded by calls to pool_barrier_enter() and
* pool_barrier_exit(). This mechanism guarantees that such processes will
* be stopped either at the beginning or at the end of the barrier so that
* the rebind operation can atomically bind the process and its threads
* to new resource sets, and then let process run again.
*
* Lock ordering with respect to other locks is as follows:
*
* pool_lock() -> cpu_lock -> pidlock -> p_lock -> pool_barrier_lock
*
* Most static and global variables defined in this file are protected
* by calling pool_lock().
*
* The operation that binds tasks and projects to pools is atomic. That is,
* either all processes in a given task or a project will be bound to a
* new pool, or (in case of an error) they will be all left bound to the
* old pool. Processes in a given task or a given project can only be bound to
* different pools if they were rebound individually one by one as single
* processes. Threads or LWPs of the same process do not have pool bindings,
* and are bound to the same resource sets associated with the resource pool
* of that process.
*
* The following picture shows one possible pool configuration with three
* pools and three processor sets. Note that processor set "foo" is not
* associated with any pools and therefore cannot have any processes
* bound to it. Two pools (default and foo) are associated with the
* same processor set (default). Also, note that processes in Task 2
* are bound to different pools.
*
*
* Processor Sets
* +---------+
* +--------------+========================>| default |
* a| | +---------+
* s| | ||
* s| | +---------+
* o| | | foo |
* c| | +---------+
* i| | ||
* a| | +---------+
* t| | +------>| bar |
* e| | | +---------+
* d| | |
* | | |
* +---------+ +---------+ +---------+
* Pools | default |======| foo |======| bar |
* +---------+ +---------+ +---------+
* @ @ @ @ @ @
* b| | | | | |
* o| | | | | |
* u| +-----+ | +-------+ | +---+
* n| | | | | |
* ....d|........|......|......|.........|.......|....
* : | :: | | | :: | | :
* : +---+ :: +---+ +---+ +---+ :: +---+ +---+ :
* Processes : | p | :: | p | | p | | p | :: | p |...| p | :
* : +---+ :: +---+ +---+ +---+ :: +---+ +---+ :
* :........::......................::...............:
* Task 1 Task 2 Task N
* | | |
* | | |
* | +-----------+ | +-----------+
* +--| Project 1 |--+ | Project N |
* +-----------+ +-----------+
*
* This is just an illustration of relationships between processes, tasks,
* projects, pools, and processor sets. New types of resource sets will be
* added in the future.
*/
pool_t *pool_default; /* default pool which always exists */
int pool_count; /* number of pools created on this system */
int pool_state; /* pools state -- enabled/disabled */
void *pool_buf; /* pre-commit snapshot of the pools state */
size_t pool_bufsz; /* size of pool_buf */
static hrtime_t pool_pool_mod; /* last modification time for pools */
static hrtime_t pool_sys_mod; /* last modification time for system */
static nvlist_t *pool_sys_prop; /* system properties */
static id_space_t *pool_ids; /* pool ID space */
static list_t pool_list; /* doubly-linked list of pools */
static kmutex_t pool_mutex; /* protects pool_busy_* */
static kcondvar_t pool_busy_cv; /* waiting for "pool_lock" */
static kthread_t *pool_busy_thread; /* thread holding "pool_lock" */
static kmutex_t pool_barrier_lock; /* synch. with pool_barrier_* */
static kcondvar_t pool_barrier_cv; /* synch. with pool_barrier_* */
static int pool_barrier_count; /* synch. with pool_barrier_* */
static list_t pool_event_cb_list; /* pool event callbacks */
static boolean_t pool_event_cb_init = B_FALSE;
static kmutex_t pool_event_cb_lock;
static taskq_t *pool_event_cb_taskq = NULL;
void pool_event_dispatch(pool_event_t, poolid_t);
/*
* Boot-time pool initialization.
*/
void
pool_init(void)
{
pool_ids = id_space_create("pool_ids", POOL_DEFAULT + 1, POOL_MAXID);
/*
* Initialize default pool.
*/
pool_default = kmem_zalloc(sizeof (pool_t), KM_SLEEP);
pool_default->pool_id = POOL_DEFAULT;
list_create(&pool_list, sizeof (pool_t), offsetof(pool_t, pool_link));
list_insert_head(&pool_list, pool_default);
/*
* Initialize plugins for resource sets.
*/
pool_pset_init();
pool_count = 1;
p0.p_pool = pool_default;
global_zone->zone_pool = pool_default;
pool_default->pool_ref = 1;
}
/*
* Synchronization routines.
*
* pool_lock is only called from syscall-level routines (processor_bind(),
* pset_*(), and /dev/pool ioctls). The pool "lock" may be held for long
* periods of time, including across sleeping operations, so we allow its
* acquisition to be interruptible.
*
* The current thread that owns the "lock" is stored in the variable
* pool_busy_thread, both to let pool_lock_held() work and to aid debugging.
*/
void
pool_lock(void)
{
mutex_enter(&pool_mutex);
ASSERT(!pool_lock_held());
while (pool_busy_thread != NULL)
cv_wait(&pool_busy_cv, &pool_mutex);
pool_busy_thread = curthread;
mutex_exit(&pool_mutex);
}
int
pool_lock_intr(void)
{
mutex_enter(&pool_mutex);
ASSERT(!pool_lock_held());
while (pool_busy_thread != NULL) {
if (cv_wait_sig(&pool_busy_cv, &pool_mutex) == 0) {
cv_signal(&pool_busy_cv);
mutex_exit(&pool_mutex);
return (1);
}
}
pool_busy_thread = curthread;
mutex_exit(&pool_mutex);
return (0);
}
int
pool_lock_held(void)
{
return (pool_busy_thread == curthread);
}
void
pool_unlock(void)
{
mutex_enter(&pool_mutex);
ASSERT(pool_lock_held());
pool_busy_thread = NULL;
cv_signal(&pool_busy_cv);
mutex_exit(&pool_mutex);
}
/*
* Routines allowing fork(), exec(), exit(), and lwp_create() to synchronize
* with pool_do_bind().
*
* Calls to pool_barrier_enter() and pool_barrier_exit() must bracket all
* operations which modify pool or pset associations. They can be called
* while the process is multi-threaded. In the common case, when current
* process is not being rebound (PBWAIT flag is not set), these functions
* will be just incrementing and decrementing reference counts.
*/
void
pool_barrier_enter(void)
{
proc_t *p = curproc;
ASSERT(MUTEX_HELD(&p->p_lock));
while (p->p_poolflag & PBWAIT)
cv_wait(&p->p_poolcv, &p->p_lock);
p->p_poolcnt++;
}
void
pool_barrier_exit(void)
{
proc_t *p = curproc;
ASSERT(MUTEX_HELD(&p->p_lock));
ASSERT(p->p_poolcnt > 0);
p->p_poolcnt--;
if (p->p_poolflag & PBWAIT) {
mutex_enter(&pool_barrier_lock);
ASSERT(pool_barrier_count > 0);
pool_barrier_count--;
if (pool_barrier_count == 0)
cv_signal(&pool_barrier_cv);
mutex_exit(&pool_barrier_lock);
while (p->p_poolflag & PBWAIT)
cv_wait(&p->p_poolcv, &p->p_lock);
}
}
/*
* Enable pools facility.
*/
static int
pool_enable(void)
{
int ret;
ASSERT(pool_lock_held());
ASSERT(pool_count == 1);
ret = pool_pset_enable();
if (ret != 0)
return (ret);
(void) nvlist_alloc(&pool_sys_prop, NV_UNIQUE_NAME, KM_SLEEP);
(void) nvlist_add_string(pool_sys_prop, "system.name",
"default");
(void) nvlist_add_string(pool_sys_prop, "system.comment", "");
(void) nvlist_add_int64(pool_sys_prop, "system.version", 1);
(void) nvlist_add_byte(pool_sys_prop, "system.bind-default", 1);
(void) nvlist_add_string(pool_sys_prop, "system.poold.objectives",
"wt-load");
(void) nvlist_alloc(&pool_default->pool_props,
NV_UNIQUE_NAME, KM_SLEEP);
(void) nvlist_add_string(pool_default->pool_props,
"pool.name", "pool_default");
(void) nvlist_add_string(pool_default->pool_props, "pool.comment", "");
(void) nvlist_add_byte(pool_default->pool_props, "pool.default", 1);
(void) nvlist_add_byte(pool_default->pool_props, "pool.active", 1);
(void) nvlist_add_int64(pool_default->pool_props,
"pool.importance", 1);
(void) nvlist_add_int64(pool_default->pool_props, "pool.sys_id",
pool_default->pool_id);
pool_sys_mod = pool_pool_mod = gethrtime();
return (ret);
}
/*
* Disable pools facility.
*/
static int
pool_disable(void)
{
int ret;
ASSERT(pool_lock_held());
if (pool_count > 1) /* must destroy all pools first */
return (EBUSY);
ret = pool_pset_disable();
if (ret != 0)
return (ret);
if (pool_sys_prop != NULL) {
nvlist_free(pool_sys_prop);
pool_sys_prop = NULL;
}
if (pool_default->pool_props != NULL) {
nvlist_free(pool_default->pool_props);
pool_default->pool_props = NULL;
}
return (0);
}
pool_t *
pool_lookup_pool_by_name(char *name)
{
pool_t *pool = pool_default;
char *p;
ASSERT(pool_lock_held());
for (pool = list_head(&pool_list); pool;
pool = list_next(&pool_list, pool)) {
if (nvlist_lookup_string(pool->pool_props,
"pool.name", &p) == 0 && strcmp(name, p) == 0)
return (pool);
}
return (NULL);
}
pool_t *
pool_lookup_pool_by_id(poolid_t poolid)
{
pool_t *pool = pool_default;
ASSERT(pool_lock_held());
for (pool = list_head(&pool_list); pool;
pool = list_next(&pool_list, pool)) {
if (pool->pool_id == poolid)
return (pool);
}
return (NULL);
}
pool_t *
pool_lookup_pool_by_pset(int id)
{
pool_t *pool = pool_default;
psetid_t psetid = (psetid_t)id;
ASSERT(pool_lock_held());
for (pool = list_head(&pool_list); pool != NULL;
pool = list_next(&pool_list, pool)) {
if (pool->pool_pset->pset_id == psetid)
return (pool);
}
return (NULL);
}
/*
* Create new pool, associate it with default resource sets, and give
* it a temporary name.
*/
static int
pool_pool_create(poolid_t *poolid)
{
pool_t *pool;
char pool_name[40];
ASSERT(pool_lock_held());
pool = kmem_zalloc(sizeof (pool_t), KM_SLEEP);
pool->pool_id = *poolid = id_alloc(pool_ids);
pool->pool_pset = pool_pset_default;
pool_pset_default->pset_npools++;
list_insert_tail(&pool_list, pool);
(void) nvlist_alloc(&pool->pool_props, NV_UNIQUE_NAME, KM_SLEEP);
(void) nvlist_add_int64(pool->pool_props, "pool.sys_id", pool->pool_id);
(void) nvlist_add_byte(pool->pool_props, "pool.default", 0);
pool_pool_mod = gethrtime();
(void) snprintf(pool_name, sizeof (pool_name), "pool_%lld",
pool_pool_mod);
(void) nvlist_add_string(pool->pool_props, "pool.name", pool_name);
pool_count++;
return (0);
}
struct destroy_zone_arg {
pool_t *old;
pool_t *new;
};
/*
* Update pool pointers for zones that are currently bound to pool "old"
* to be bound to pool "new".
*/
static int
pool_destroy_zone_cb(zone_t *zone, void *arg)
{
struct destroy_zone_arg *dza = arg;
ASSERT(pool_lock_held());
ASSERT(MUTEX_HELD(&cpu_lock));
if (zone_pool_get(zone) == dza->old)
zone_pool_set(zone, dza->new);
return (0);
}
/*
* Destroy specified pool, and rebind all processes in it
* to the default pool.
*/
static int
pool_pool_destroy(poolid_t poolid)
{
pool_t *pool;
int ret;
ASSERT(pool_lock_held());
if (poolid == POOL_DEFAULT)
return (EINVAL);
if ((pool = pool_lookup_pool_by_id(poolid)) == NULL)
return (ESRCH);
ret = pool_do_bind(pool_default, P_POOLID, poolid, POOL_BIND_ALL);
if (ret == 0) {
struct destroy_zone_arg dzarg;
dzarg.old = pool;
dzarg.new = pool_default;
mutex_enter(&cpu_lock);
ret = zone_walk(pool_destroy_zone_cb, &dzarg);
mutex_exit(&cpu_lock);
ASSERT(ret == 0);
ASSERT(pool->pool_ref == 0);
(void) nvlist_free(pool->pool_props);
id_free(pool_ids, pool->pool_id);
pool->pool_pset->pset_npools--;
list_remove(&pool_list, pool);
pool_count--;
pool_pool_mod = gethrtime();
kmem_free(pool, sizeof (pool_t));
}
return (ret);
}
/*
* Create new pool or resource set.
*/
int
pool_create(int class, int subclass, id_t *id)
{
int ret;
ASSERT(pool_lock_held());
if (pool_state == POOL_DISABLED)
return (ENOTACTIVE);
switch (class) {
case PEC_POOL:
ret = pool_pool_create((poolid_t *)id);
break;
case PEC_RES_COMP:
switch (subclass) {
case PREC_PSET:
ret = pool_pset_create((psetid_t *)id);
break;
default:
ret = EINVAL;
}
break;
case PEC_RES_AGG:
ret = ENOTSUP;
break;
default:
ret = EINVAL;
}
return (ret);
}
/*
* Destroy an existing pool or resource set.
*/
int
pool_destroy(int class, int subclass, id_t id)
{
int ret;
ASSERT(pool_lock_held());
if (pool_state == POOL_DISABLED)
return (ENOTACTIVE);
switch (class) {
case PEC_POOL:
ret = pool_pool_destroy((poolid_t)id);
break;
case PEC_RES_COMP:
switch (subclass) {
case PREC_PSET:
ret = pool_pset_destroy((psetid_t)id);
break;
default:
ret = EINVAL;
}
break;
case PEC_RES_AGG:
ret = ENOTSUP;
break;
default:
ret = EINVAL;
}
return (ret);
}
/*
* Enable or disable pools.
*/
int
pool_status(int status)
{
int ret = 0;
ASSERT(pool_lock_held());
if (pool_state == status)
return (0);
switch (status) {
case POOL_ENABLED:
ret = pool_enable();
if (ret != 0)
return (ret);
pool_state = POOL_ENABLED;
pool_event_dispatch(POOL_E_ENABLE, NULL);
break;
case POOL_DISABLED:
ret = pool_disable();
if (ret != 0)
return (ret);
pool_state = POOL_DISABLED;
pool_event_dispatch(POOL_E_DISABLE, NULL);
break;
default:
ret = EINVAL;
}
return (ret);
}
/*
* Associate pool with resource set.
*/
int
pool_assoc(poolid_t poolid, int idtype, id_t id)
{
int ret;
ASSERT(pool_lock_held());
if (pool_state == POOL_DISABLED)
return (ENOTACTIVE);
switch (idtype) {
case PREC_PSET:
ret = pool_pset_assoc(poolid, (psetid_t)id);
if (ret == 0)
pool_event_dispatch(POOL_E_CHANGE, poolid);
break;
default:
ret = EINVAL;
}
if (ret == 0)
pool_pool_mod = gethrtime();
return (ret);
}
/*
* Disassociate resource set from pool.
*/
int
pool_dissoc(poolid_t poolid, int idtype)
{
int ret;
ASSERT(pool_lock_held());
if (pool_state == POOL_DISABLED)
return (ENOTACTIVE);
switch (idtype) {
case PREC_PSET:
ret = pool_pset_assoc(poolid, PS_NONE);
if (ret == 0)
pool_event_dispatch(POOL_E_CHANGE, poolid);
break;
default:
ret = EINVAL;
}
if (ret == 0)
pool_pool_mod = gethrtime();
return (ret);
}
/*
* Transfer specified quantity of resources between resource sets.
*/
/*ARGSUSED*/
int
pool_transfer(int type, id_t src, id_t dst, uint64_t qty)
{
int ret = EINVAL;
return (ret);
}
static poolid_t
pool_lookup_id_by_pset(int id)
{
pool_t *pool = pool_default;
psetid_t psetid = (psetid_t)id;
ASSERT(pool_lock_held());
for (pool = list_head(&pool_list); pool != NULL;
pool = list_next(&pool_list, pool)) {
if (pool->pool_pset->pset_id == psetid)
return (pool->pool_id);
}
return (POOL_INVALID);
}
/*
* Transfer resources specified by their IDs between resource sets.
*/
int
pool_xtransfer(int type, id_t src_pset, id_t dst_pset, uint_t size, id_t *ids)
{
int ret;
poolid_t src_pool, dst_pool;
ASSERT(pool_lock_held());
if (pool_state == POOL_DISABLED)
return (ENOTACTIVE);
switch (type) {
case PREC_PSET:
ret = pool_pset_xtransfer((psetid_t)src_pset,
(psetid_t)dst_pset, size, ids);
if (ret == 0) {
if ((src_pool = pool_lookup_id_by_pset(src_pset)) !=
POOL_INVALID)
pool_event_dispatch(POOL_E_CHANGE, src_pool);
if ((dst_pool = pool_lookup_id_by_pset(dst_pset)) !=
POOL_INVALID)
pool_event_dispatch(POOL_E_CHANGE, dst_pool);
}
break;
default:
ret = EINVAL;
}
return (ret);
}
/*
* Bind processes to pools.
*/
int
pool_bind(poolid_t poolid, idtype_t idtype, id_t id)
{
pool_t *pool;
ASSERT(pool_lock_held());
if (pool_state == POOL_DISABLED)
return (ENOTACTIVE);
if ((pool = pool_lookup_pool_by_id(poolid)) == NULL)
return (ESRCH);
switch (idtype) {
case P_PID:
case P_TASKID:
case P_PROJID:
case P_ZONEID:
break;
default:
return (EINVAL);
}
return (pool_do_bind(pool, idtype, id, POOL_BIND_ALL));
}
/*
* Query pool binding of the specifed process.
*/
int
pool_query_binding(idtype_t idtype, id_t id, id_t *poolid)
{
proc_t *p;
if (idtype != P_PID)
return (ENOTSUP);
if (id == P_MYID)
id = curproc->p_pid;
ASSERT(pool_lock_held());
mutex_enter(&pidlock);
if ((p = prfind((pid_t)id)) == NULL) {
mutex_exit(&pidlock);
return (ESRCH);
}
mutex_enter(&p->p_lock);
/*
* In local zones, lie about pool bindings of processes from
* the global zone.
*/
if (!INGLOBALZONE(curproc) && INGLOBALZONE(p)) {
pool_t *pool;
pool = zone_pool_get(curproc->p_zone);
*poolid = pool->pool_id;
} else {
*poolid = p->p_pool->pool_id;
}
mutex_exit(&p->p_lock);
mutex_exit(&pidlock);
return (0);
}
static ea_object_t *
pool_system_pack(void)
{
ea_object_t *eo_system;
size_t bufsz = 0;
char *buf = NULL;
ASSERT(pool_lock_held());
eo_system = ea_alloc_group(EXT_GROUP | EXC_LOCAL | EXD_GROUP_SYSTEM);
(void) ea_attach_item(eo_system, &pool_sys_mod, sizeof (hrtime_t),
EXC_LOCAL | EXD_SYSTEM_TSTAMP | EXT_UINT64);
if (INGLOBALZONE(curproc))
(void) ea_attach_item(eo_system, &pool_pool_mod,
sizeof (hrtime_t),
EXC_LOCAL | EXD_POOL_TSTAMP | EXT_UINT64);
else
(void) ea_attach_item(eo_system,
&curproc->p_zone->zone_pool_mod,
sizeof (hrtime_t),
EXC_LOCAL | EXD_POOL_TSTAMP | EXT_UINT64);
(void) ea_attach_item(eo_system, &pool_pset_mod, sizeof (hrtime_t),
EXC_LOCAL | EXD_PSET_TSTAMP | EXT_UINT64);
(void) ea_attach_item(eo_system, &pool_cpu_mod, sizeof (hrtime_t),
EXC_LOCAL | EXD_CPU_TSTAMP | EXT_UINT64);
(void) nvlist_pack(pool_sys_prop, &buf, &bufsz, NV_ENCODE_NATIVE, 0);
(void) ea_attach_item(eo_system, buf, bufsz,
EXC_LOCAL | EXD_SYSTEM_PROP | EXT_RAW);
kmem_free(buf, bufsz);
return (eo_system);
}
/*
* Pack information about pools and attach it to specified exacct group.
*/
static int
pool_pool_pack(ea_object_t *eo_system)
{
ea_object_t *eo_pool;
pool_t *pool;
size_t bufsz;
char *buf;
pool_t *myzonepool;
ASSERT(pool_lock_held());
myzonepool = zone_pool_get(curproc->p_zone);
for (pool = list_head(&pool_list); pool;
pool = list_next(&pool_list, pool)) {
if (!INGLOBALZONE(curproc) && myzonepool != pool)
continue;
bufsz = 0;
buf = NULL;
eo_pool = ea_alloc_group(EXT_GROUP |
EXC_LOCAL | EXD_GROUP_POOL);
(void) ea_attach_item(eo_pool, &pool->pool_id, sizeof (id_t),
EXC_LOCAL | EXD_POOL_POOLID | EXT_UINT32);
(void) ea_attach_item(eo_pool, &pool->pool_pset->pset_id,
sizeof (id_t), EXC_LOCAL | EXD_POOL_PSETID | EXT_UINT32);
(void) nvlist_pack(pool->pool_props, &buf, &bufsz,
NV_ENCODE_NATIVE, 0);
(void) ea_attach_item(eo_pool, buf, bufsz,
EXC_LOCAL | EXD_POOL_PROP | EXT_RAW);
kmem_free(buf, bufsz);
(void) ea_attach_to_group(eo_system, eo_pool);
}
return (0);
}
/*
* Pack the whole pool configuration in the specified buffer.
*/
int
pool_pack_conf(void *kbuf, size_t kbufsz, size_t *asize)
{
ea_object_t *eo_system;
size_t ksize;
int ret = 0;
ASSERT(pool_lock_held());
eo_system = pool_system_pack(); /* 1. pack system */
(void) pool_pool_pack(eo_system); /* 2. pack all pools */
(void) pool_pset_pack(eo_system); /* 3. pack all psets */
ksize = ea_pack_object(eo_system, NULL, 0);
if (kbuf == NULL || kbufsz == 0)
*asize = ksize;
else if (ksize > kbufsz)
ret = ENOMEM;
else
*asize = ea_pack_object(eo_system, kbuf, kbufsz);
ea_free_object(eo_system, EUP_ALLOC);
return (ret);
}
/*
* Start/end the commit transaction. If commit transaction is currently
* in progress, then all POOL_QUERY ioctls will return pools configuration
* at the beginning of transaction.
*/
int
pool_commit(int state)
{
ea_object_t *eo_system;
int ret = 0;
ASSERT(pool_lock_held());
if (pool_state == POOL_DISABLED)
return (ENOTACTIVE);
switch (state) {
case 1:
/*
* Beginning commit transation.
*/
if (pool_buf != NULL) /* transaction in progress */
return (EBUSY);
eo_system = pool_system_pack(); /* 1. pack system */
(void) pool_pool_pack(eo_system); /* 2. pack all pools */
(void) pool_pset_pack(eo_system); /* 3. pack all psets */
pool_bufsz = ea_pack_object(eo_system, NULL, 0);
pool_buf = kmem_alloc(pool_bufsz, KM_SLEEP);
pool_bufsz = ea_pack_object(eo_system, pool_buf, pool_bufsz);
ea_free_object(eo_system, EUP_ALLOC);
break;
case 0:
/*
* Finishing commit transaction.
*/
if (pool_buf != NULL) {
kmem_free(pool_buf, pool_bufsz);
pool_buf = NULL;
pool_bufsz = 0;
}
break;
default:
ret = EINVAL;
}
return (ret);
}
/*
* Check is the specified property is special
*/
static pool_property_t *
pool_property_find(char *name, pool_property_t *list)
{
pool_property_t *prop;
for (prop = list; prop->pp_name != NULL; prop++)
if (strcmp(prop->pp_name, name) == 0)
return (prop);
return (NULL);
}
static pool_property_t pool_prop_sys[] = {
{ "system.name", DATA_TYPE_STRING, PP_RDWR },
{ "system.comment", DATA_TYPE_STRING, PP_RDWR },
{ "system.version", DATA_TYPE_UINT64, PP_READ },
{ "system.bind-default", DATA_TYPE_BYTE, PP_RDWR },
{ "system.allocate-method", DATA_TYPE_STRING,
PP_RDWR | PP_OPTIONAL },
{ "system.poold.log-level", DATA_TYPE_STRING,
PP_RDWR | PP_OPTIONAL },
{ "system.poold.log-location", DATA_TYPE_STRING,
PP_RDWR | PP_OPTIONAL },
{ "system.poold.monitor-interval", DATA_TYPE_UINT64,
PP_RDWR | PP_OPTIONAL },
{ "system.poold.history-file", DATA_TYPE_STRING,
PP_RDWR | PP_OPTIONAL },
{ "system.poold.objectives", DATA_TYPE_STRING,
PP_RDWR | PP_OPTIONAL },
{ NULL, 0, 0 }
};
static pool_property_t pool_prop_pool[] = {
{ "pool.sys_id", DATA_TYPE_UINT64, PP_READ },
{ "pool.name", DATA_TYPE_STRING, PP_RDWR },
{ "pool.default", DATA_TYPE_BYTE, PP_READ },
{ "pool.active", DATA_TYPE_BYTE, PP_RDWR },
{ "pool.importance", DATA_TYPE_INT64, PP_RDWR },
{ "pool.comment", DATA_TYPE_STRING, PP_RDWR },
{ "pool.scheduler", DATA_TYPE_STRING,
PP_RDWR | PP_OPTIONAL },
{ NULL, 0, 0 }
};
/*
* Common routine to put new property on the specified list
*/
int
pool_propput_common(nvlist_t *nvlist, nvpair_t *pair, pool_property_t *props)
{
pool_property_t *prop;
if ((prop = pool_property_find(nvpair_name(pair), props)) != NULL) {
/*
* No read-only properties or properties with bad types
*/
if (!(prop->pp_perm & PP_WRITE) ||
prop->pp_type != nvpair_type(pair))
return (EINVAL);
}
return (nvlist_add_nvpair(nvlist, pair));
}
/*
* Common routine to remove property from the given list
*/
int
pool_proprm_common(nvlist_t *nvlist, char *name, pool_property_t *props)
{
pool_property_t *prop;
if ((prop = pool_property_find(name, props)) != NULL) {
if (!(prop->pp_perm & PP_OPTIONAL))
return (EINVAL);
}
return (nvlist_remove_all(nvlist, name));
}
static int
pool_system_propput(nvpair_t *pair)
{
int ret;
ASSERT(pool_lock_held());
ret = pool_propput_common(pool_sys_prop, pair, pool_prop_sys);
if (ret == 0)
pool_sys_mod = gethrtime();
return (ret);
}
static int
pool_system_proprm(char *name)
{
int ret;
ASSERT(pool_lock_held());
ret = pool_proprm_common(pool_sys_prop, name, pool_prop_sys);
if (ret == 0)
pool_sys_mod = gethrtime();
return (ret);
}
static int
pool_pool_propput(poolid_t poolid, nvpair_t *pair)
{
pool_t *pool;
int ret;
ASSERT(pool_lock_held());
if ((pool = pool_lookup_pool_by_id(poolid)) == NULL)
return (ESRCH);
ret = pool_propput_common(pool->pool_props, pair, pool_prop_pool);
if (ret == 0)
pool_pool_mod = gethrtime();
return (ret);
}
static int
pool_pool_proprm(poolid_t poolid, char *name)
{
int ret;
pool_t *pool;
ASSERT(pool_lock_held());
if ((pool = pool_lookup_pool_by_id(poolid)) == NULL)
return (ESRCH);
ret = pool_proprm_common(pool->pool_props, name, pool_prop_pool);
if (ret == 0)
pool_pool_mod = gethrtime();
return (ret);
}
int
pool_propput(int class, int subclass, id_t id, nvpair_t *pair)
{
int ret;
ASSERT(pool_lock_held());
if (pool_state == POOL_DISABLED)
return (ENOTACTIVE);
switch (class) {
case PEC_SYSTEM:
ret = pool_system_propput(pair);
break;
case PEC_POOL:
ret = pool_pool_propput((poolid_t)id, pair);
break;
case PEC_RES_COMP:
switch (subclass) {
case PREC_PSET:
ret = pool_pset_propput((psetid_t)id, pair);
break;
default:
ret = EINVAL;
}
break;
case PEC_RES_AGG:
ret = ENOTSUP;
break;
case PEC_COMP:
switch (subclass) {
case PCEC_CPU:
ret = pool_cpu_propput((processorid_t)id, pair);
break;
default:
ret = EINVAL;
}
break;
default:
ret = EINVAL;
}
return (ret);
}
int
pool_proprm(int class, int subclass, id_t id, char *name)
{
int ret;
ASSERT(pool_lock_held());
if (pool_state == POOL_DISABLED)
return (ENOTACTIVE);
switch (class) {
case PEC_SYSTEM:
ret = pool_system_proprm(name);
break;
case PEC_POOL:
ret = pool_pool_proprm((poolid_t)id, name);
break;
case PEC_RES_COMP:
switch (subclass) {
case PREC_PSET:
ret = pool_pset_proprm((psetid_t)id, name);
break;
default:
ret = EINVAL;
}
break;
case PEC_RES_AGG:
ret = ENOTSUP;
break;
case PEC_COMP:
switch (subclass) {
case PCEC_CPU:
ret = pool_cpu_proprm((processorid_t)id, name);
break;
default:
ret = EINVAL;
}
break;
default:
ret = EINVAL;
}
return (ret);
}
int
pool_propget(char *name, int class, int subclass, id_t id, nvlist_t **nvlp)
{
int ret;
nvlist_t *nvl;
ASSERT(pool_lock_held());
if (pool_state == POOL_DISABLED)
return (ENOTACTIVE);
(void) nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP);
switch (class) {
case PEC_SYSTEM:
case PEC_POOL:
ret = EINVAL;
break;
case PEC_RES_COMP:
switch (subclass) {
case PREC_PSET:
ret = pool_pset_propget((psetid_t)id, name, nvl);
break;
default:
ret = EINVAL;
}
break;
case PEC_RES_AGG:
ret = ENOTSUP;
break;
case PEC_COMP:
switch (subclass) {
case PCEC_CPU:
ret = pool_cpu_propget((processorid_t)id, name, nvl);
break;
default:
ret = EINVAL;
}
break;
default:
ret = EINVAL;
}
if (ret == 0)
*nvlp = nvl;
else
nvlist_free(nvl);
return (ret);
}
/*
* pool_bind_wake and pool_bind_wakeall are helper functions to undo PBWAITs
* in case of failure in pool_do_bind().
*/
static void
pool_bind_wake(proc_t *p)
{
ASSERT(pool_lock_held());
mutex_enter(&p->p_lock);
ASSERT(p->p_poolflag & PBWAIT);
if (p->p_poolcnt > 0) {
mutex_enter(&pool_barrier_lock);
pool_barrier_count -= p->p_poolcnt;
mutex_exit(&pool_barrier_lock);
}
p->p_poolflag &= ~PBWAIT;
cv_signal(&p->p_poolcv);
mutex_exit(&p->p_lock);
}
static void
pool_bind_wakeall(proc_t **procs)
{
proc_t *p, **pp;
ASSERT(pool_lock_held());
for (pp = procs; (p = *pp) != NULL; pp++)
pool_bind_wake(p);
}
/*
* Return the scheduling class for this pool, or
* POOL_CLASS_UNSET if not set
* POOL_CLASS_INVAL if set to an invalid class ID.
*/
id_t
pool_get_class(pool_t *pool)
{
char *name;
id_t cid;
ASSERT(pool_lock_held());
if (nvlist_lookup_string(pool->pool_props, "pool.scheduler",
&name) == 0) {
if (getcidbyname(name, &cid) == 0)
return (cid);
else
return (POOL_CLASS_INVAL);
}
return (POOL_CLASS_UNSET);
}
/*
* Move process to the new scheduling class.
*/
static void
pool_change_class(proc_t *p, id_t cid)
{
kthread_t *t;
void *cldata;
id_t oldcid;
void **bufs;
void **buf;
int nlwp;
int ret;
int i;
/*
* Do not move kernel processes (such as zsched).
*/
if (p->p_flag & SSYS)
return;
/*
* This process is in the pool barrier, so it can't possibly be
* adding new threads and we can use p_lwpcnt + p_zombcnt + 1
* (for possible agent LWP which doesn't use pool barrier) as
* our upper bound.
*/
nlwp = p->p_lwpcnt + p->p_zombcnt + 1;
/*
* Pre-allocate scheduling class specific buffers before
* grabbing p_lock.
*/
bufs = kmem_zalloc(nlwp * sizeof (void *), KM_SLEEP);
for (i = 0, buf = bufs; i < nlwp; i++, buf++) {
ret = CL_ALLOC(buf, cid, KM_SLEEP);
ASSERT(ret == 0);
}
/*
* Move threads one by one to the new scheduling class.
* This never fails because we have all the right
* privileges here.
*/
mutex_enter(&p->p_lock);
ASSERT(p->p_poolflag & PBWAIT);
buf = bufs;
t = p->p_tlist;
ASSERT(t != NULL);
do {
if (t->t_cid != cid) {
oldcid = t->t_cid;
cldata = t->t_cldata;
ret = CL_ENTERCLASS(t, cid, NULL, NULL, *buf);
ASSERT(ret == 0);
CL_EXITCLASS(oldcid, cldata);
schedctl_set_cidpri(t);
*buf++ = NULL;
}
} while ((t = t->t_forw) != p->p_tlist);
mutex_exit(&p->p_lock);
/*
* Free unused scheduling class specific buffers.
*/
for (i = 0, buf = bufs; i < nlwp; i++, buf++) {
if (*buf != NULL) {
CL_FREE(cid, *buf);
*buf = NULL;
}
}
kmem_free(bufs, nlwp * sizeof (void *));
}
void
pool_get_name(pool_t *pool, char **name)
{
ASSERT(pool_lock_held());
(void) nvlist_lookup_string(pool->pool_props, "pool.name", name);
ASSERT(strlen(*name) != 0);
}
/*
* The meat of the bind operation. The steps in pool_do_bind are:
*
* 1) Set PBWAIT in the p_poolflag of any process of interest, and add all
* such processes to an array. For any interesting process that has
* threads inside the pool barrier set, increment a counter by the
* count of such threads. Once PBWAIT is set on a process, that process
* will not disappear.
*
* 2) Wait for the counter from step 2 to drop to zero. Any process which
* calls pool_barrier_exit() and notices that PBWAIT has been set on it
* will decrement that counter before going to sleep, and the process
* calling pool_barrier_exit() which does the final decrement will wake us.
*
* 3) For each interesting process, perform a calculation on it to see if
* the bind will actually succeed. This uses the following three
* resource-set-specific functions:
*
* - int set_bind_start(procs, pool)
*
* Determine whether the given array of processes can be bound to the
* resource set associated with the given pool. If it can, take and hold
* any locks necessary to ensure that the operation will succeed, and
* make any necessary reservations in the target resource set. If it
* can't, return failure with no reservations made and no new locks held.
*
* - void set_bind_abort(procs, pool)
*
* set_bind_start() has completed successfully, but another resource set's
* set_bind_start() has failed, and we haven't begun the bind yet. Undo
* any reservations made and drop any locks acquired by our
* set_bind_start().
*
* - void set_bind_finish(void)
*
* The bind has completed successfully. The processes have been released,
* and the reservation acquired in set_bind_start() has been depleted as
* the processes have finished their bindings. Drop any locks acquired by
* set_bind_start().
*
* 4) If we've decided that we can proceed with the bind, iterate through
* the list of interesting processes, grab the necessary locks (which
* may differ per resource set), perform the bind, and ASSERT that it
* succeeds. Once a process has been rebound, it can be awakened.
*
* The operations from step 4 must be kept in sync with anything which might
* cause the bind operations (e.g., cpupart_bind_thread()) to fail, and
* are thus located in the same source files as the associated bind operations.
*/
int
pool_do_bind(pool_t *pool, idtype_t idtype, id_t id, int flags)
{
extern uint_t nproc;
klwp_t *lwp = ttolwp(curthread);
proc_t **pp, **procs;
proc_t *prstart;
int procs_count = 0;
kproject_t *kpj;
procset_t set;
zone_t *zone;
int procs_size;
int rv = 0;
proc_t *p;
id_t cid = -1;
ASSERT(pool_lock_held());
if ((cid = pool_get_class(pool)) == POOL_CLASS_INVAL)
return (EINVAL);
if (idtype == P_ZONEID) {
zone = zone_find_by_id(id);
if (zone == NULL)
return (ESRCH);
if (zone_status_get(zone) > ZONE_IS_RUNNING) {
zone_rele(zone);
return (EBUSY);
}
}
if (idtype == P_PROJID) {
kpj = project_hold_by_id(id, global_zone, PROJECT_HOLD_FIND);
if (kpj == NULL)
return (ESRCH);
mutex_enter(&kpj->kpj_poolbind);
}
if (idtype == P_PID) {
/*
* Fast-path for a single process case.
*/
procs_size = 2; /* procs is NULL-terminated */
procs = kmem_zalloc(procs_size * sizeof (proc_t *), KM_SLEEP);
mutex_enter(&pidlock);
} else {
/*
* We will need enough slots for proc_t pointers for as many as
* twice the number of currently running processes (assuming
* that each one could be in fork() creating a new child).
*/
for (;;) {
procs_size = nproc * 2;
procs = kmem_zalloc(procs_size * sizeof (proc_t *),
KM_SLEEP);
mutex_enter(&pidlock);
if (nproc * 2 <= procs_size)
break;
/*
* If nproc has changed, try again.
*/
mutex_exit(&pidlock);
kmem_free(procs, procs_size * sizeof (proc_t *));
}
}
if (id == P_MYID)
id = getmyid(idtype);
setprocset(&set, POP_AND, idtype, id, P_ALL, 0);
/*
* Do a first scan, and select target processes.
*/
if (idtype == P_PID)
prstart = prfind(id);
else
prstart = practive;
for (p = prstart, pp = procs; p != NULL; p = p->p_next) {
mutex_enter(&p->p_lock);
/*
* Skip processes that don't match our (id, idtype) set or
* on the way of becoming zombies. Skip kernel processes
* from the global zone.
*/
if (procinset(p, &set) == 0 ||
p->p_poolflag & PEXITED ||
((p->p_flag & SSYS) && INGLOBALZONE(p))) {
mutex_exit(&p->p_lock);
continue;
}
if (!INGLOBALZONE(p)) {
switch (idtype) {
case P_PID:
case P_TASKID:
/*
* Can't bind processes or tasks
* in local zones to pools.
*/
mutex_exit(&p->p_lock);
mutex_exit(&pidlock);
pool_bind_wakeall(procs);
rv = EINVAL;
goto out;
case P_PROJID:
/*
* Only projects in the global
* zone can be rebound.
*/
mutex_exit(&p->p_lock);
continue;
case P_POOLID:
/*
* When rebinding pools, processes can be
* in different zones.
*/
break;
}
}
p->p_poolflag |= PBWAIT;
/*
* If some threads in this process are inside the pool
* barrier, add them to pool_barrier_count, as we have
* to wait for all of them to exit the barrier.
*/
if (p->p_poolcnt > 0) {
mutex_enter(&pool_barrier_lock);
pool_barrier_count += p->p_poolcnt;
mutex_exit(&pool_barrier_lock);
}
ASSERT(pp < &procs[procs_size]);
*pp++ = p;
procs_count++;
mutex_exit(&p->p_lock);
/*
* We just found our process, so if we're only rebinding a
* single process then get out of this loop.
*/
if (idtype == P_PID)
break;
}
*pp = NULL; /* cap off the end of the array */
mutex_exit(&pidlock);
/*
* Wait for relevant processes to stop before they try to enter the
* barrier or at the exit from the barrier. Make sure that we do
* not get stopped here while we're holding pool_lock. If we were
* requested to stop, or got a signal then return EAGAIN to let the
* library know that it needs to retry.
*/
mutex_enter(&pool_barrier_lock);
lwp->lwp_nostop++;
while (pool_barrier_count > 0) {
(void) cv_wait_sig(&pool_barrier_cv, &pool_barrier_lock);
if (pool_barrier_count > 0) {
/*
* We either got a signal or were requested to
* stop by /proc. Bail out with EAGAIN. If we were
* requested to stop, we'll stop in post_syscall()
* on our way back to userland.
*/
mutex_exit(&pool_barrier_lock);
pool_bind_wakeall(procs);
lwp->lwp_nostop--;
rv = EAGAIN;
goto out;
}
}
lwp->lwp_nostop--;
mutex_exit(&pool_barrier_lock);
if (idtype == P_PID) {
if ((p = *procs) == NULL)
goto skip;
mutex_enter(&p->p_lock);
/* Drop the process if it is exiting */
if (p->p_poolflag & PEXITED) {
mutex_exit(&p->p_lock);
pool_bind_wake(p);
procs_count--;
} else
mutex_exit(&p->p_lock);
goto skip;
}
/*
* Do another run, and drop processes that were inside the barrier
* in exit(), but when they have dropped to pool_barrier_exit
* they have become of no interest to us. Pick up child processes that
* were created by fork() but didn't exist during our first scan.
* Their parents are now stopped at pool_barrier_exit in cfork().
*/
mutex_enter(&pidlock);
for (pp = procs; (p = *pp) != NULL; pp++) {
mutex_enter(&p->p_lock);
if (p->p_poolflag & PEXITED) {
ASSERT(p->p_lwpcnt == 0);
mutex_exit(&p->p_lock);
pool_bind_wake(p);
/* flip w/last non-NULL slot */
*pp = procs[procs_count - 1];
procs[procs_count - 1] = NULL;
procs_count--;
pp--; /* try this slot again */
continue;
} else
mutex_exit(&p->p_lock);
/*
* Look at the child and check if it should be rebound also.
* We're holding pidlock, so it is safe to reference p_child.
*/
if ((p = p->p_child) == NULL)
continue;
mutex_enter(&p->p_lock);
/*
* Skip system processes and make sure that the child is in
* the same task/project/pool/zone as the parent.
*/
if ((!INGLOBALZONE(p) && idtype != P_ZONEID &&
idtype != P_POOLID) || p->p_flag & SSYS) {
mutex_exit(&p->p_lock);
continue;
}
/*
* If the child process has been already created by fork(), has
* not exited, and has not been added to the list already,
* then add it now. We will hit this process again (since we
* stick it at the end of the procs list) but it will ignored
* because it will have the PBWAIT flag set.
*/
if (procinset(p, &set) &&
!(p->p_poolflag & PEXITED) &&
!(p->p_poolflag & PBWAIT)) {
ASSERT(p->p_child == NULL); /* no child of a child */
procs[procs_count] = p;
procs[procs_count + 1] = NULL;
procs_count++;
p->p_poolflag |= PBWAIT;
}
mutex_exit(&p->p_lock);
}
mutex_exit(&pidlock);
skip:
/*
* If there's no processes to rebind then return ESRCH, unless
* we're associating a pool with new resource set, destroying it,
* or binding a zone to a pool.
*/
if (procs_count == 0) {
if (idtype == P_POOLID || idtype == P_ZONEID)
rv = 0;
else
rv = ESRCH;
goto out;
}
#ifdef DEBUG
/*
* All processes in the array should have PBWAIT set, and none
* should be in the critical section. Thus, although p_poolflag
* and p_poolcnt are protected by p_lock, their ASSERTions below
* should be stable without it. procinset(), however, ASSERTs that
* the p_lock is held upon entry.
*/
for (pp = procs; (p = *pp) != NULL; pp++) {
int in_set;
mutex_enter(&p->p_lock);
in_set = procinset(p, &set);
mutex_exit(&p->p_lock);
ASSERT(in_set);
ASSERT(p->p_poolflag & PBWAIT);
ASSERT(p->p_poolcnt == 0);
}
#endif
/*
* Do the check if processor set rebinding is going to succeed or not.
*/
if ((flags & POOL_BIND_PSET) &&
(rv = pset_bind_start(procs, pool)) != 0) {
pool_bind_wakeall(procs);
goto out;
}
/*
* At this point, all bind operations should succeed.
*/
for (pp = procs; (p = *pp) != NULL; pp++) {
if (flags & POOL_BIND_PSET) {
psetid_t psetid = pool->pool_pset->pset_id;
void *zonebuf;
void *projbuf;
/*
* Pre-allocate one buffer for FSS (per-project
* buffer for a new pset) in case if this is the
* first thread from its current project getting
* bound to this processor set.
*/
projbuf = fss_allocbuf(FSS_ONE_BUF, FSS_ALLOC_PROJ);
zonebuf = fss_allocbuf(FSS_ONE_BUF, FSS_ALLOC_ZONE);
mutex_enter(&pidlock);
mutex_enter(&p->p_lock);
pool_pset_bind(p, psetid, projbuf, zonebuf);
mutex_exit(&p->p_lock);
mutex_exit(&pidlock);
/*
* Free buffers pre-allocated above if it
* wasn't actually used.
*/
fss_freebuf(projbuf, FSS_ALLOC_PROJ);
fss_freebuf(zonebuf, FSS_ALLOC_ZONE);
}
/*
* Now let's change the scheduling class of this
* process if our target pool has it defined.
*/
if (cid != POOL_CLASS_UNSET)
pool_change_class(p, cid);
/*
* It is safe to reference p_pool here without holding
* p_lock because it cannot change underneath of us.
* We're holding pool_lock here, so nobody else can be
* moving this process between pools. If process "p"
* would be exiting, we're guaranteed that it would be blocked
* at pool_barrier_enter() in exit(). Otherwise, it would've
* been skipped by one of our scans of the practive list
* as a process with PEXITED flag set.
*/
if (p->p_pool != pool) {
ASSERT(p->p_pool->pool_ref > 0);
atomic_add_32(&p->p_pool->pool_ref, -1);
p->p_pool = pool;
atomic_add_32(&p->p_pool->pool_ref, 1);
}
/*
* Okay, we've tortured this guy enough.
* Let this poor process go now.
*/
pool_bind_wake(p);
}
if (flags & POOL_BIND_PSET)
pset_bind_finish();
out: switch (idtype) {
case P_PROJID:
ASSERT(kpj != NULL);
mutex_exit(&kpj->kpj_poolbind);
project_rele(kpj);
break;
case P_ZONEID:
if (rv == 0) {
mutex_enter(&cpu_lock);
zone_pool_set(zone, pool);
mutex_exit(&cpu_lock);
}
zone->zone_pool_mod = gethrtime();
zone_rele(zone);
break;
}
kmem_free(procs, procs_size * sizeof (proc_t *));
ASSERT(pool_barrier_count == 0);
return (rv);
}
void
pool_event_cb_register(pool_event_cb_t *cb)
{
ASSERT(!pool_lock_held() || panicstr);
ASSERT(cb->pec_func != NULL);
mutex_enter(&pool_event_cb_lock);
if (!pool_event_cb_init) {
list_create(&pool_event_cb_list, sizeof (pool_event_cb_t),
offsetof(pool_event_cb_t, pec_list));
pool_event_cb_init = B_TRUE;
}
list_insert_tail(&pool_event_cb_list, cb);
mutex_exit(&pool_event_cb_lock);
}
void
pool_event_cb_unregister(pool_event_cb_t *cb)
{
ASSERT(!pool_lock_held() || panicstr);
mutex_enter(&pool_event_cb_lock);
list_remove(&pool_event_cb_list, cb);
mutex_exit(&pool_event_cb_lock);
}
typedef struct {
pool_event_t tqd_what;
poolid_t tqd_id;
} pool_tqd_t;
void
pool_event_notify(void *arg)
{
pool_tqd_t *tqd = (pool_tqd_t *)arg;
pool_event_cb_t *cb;
ASSERT(!pool_lock_held() || panicstr);
mutex_enter(&pool_event_cb_lock);
for (cb = list_head(&pool_event_cb_list); cb != NULL;
cb = list_next(&pool_event_cb_list, cb)) {
cb->pec_func(tqd->tqd_what, tqd->tqd_id, cb->pec_arg);
}
mutex_exit(&pool_event_cb_lock);
kmem_free(tqd, sizeof (*tqd));
}
void
pool_event_dispatch(pool_event_t what, poolid_t id)
{
pool_tqd_t *tqd = NULL;
ASSERT(pool_lock_held());
if (pool_event_cb_taskq == NULL) {
pool_event_cb_taskq = taskq_create("pool_event_cb_taskq", 1,
-1, 1, 1, TASKQ_PREPOPULATE);
}
tqd = kmem_alloc(sizeof (*tqd), KM_SLEEP);
tqd->tqd_what = what;
tqd->tqd_id = id;
(void) taskq_dispatch(pool_event_cb_taskq, pool_event_notify, tqd,
KM_SLEEP);
}
|