Commit 52bad64d authored by David Howells's avatar David Howells
Browse files

WorkStruct: Separate delayable and non-delayable events.



Separate delayable work items from non-delayable work items be splitting them
into a separate structure (delayed_work), which incorporates a work_struct and
the timer_list removed from work_struct.

The work_struct struct is huge, and this limits it's usefulness.  On a 64-bit
architecture it's nearly 100 bytes in size.  This reduces that by half for the
non-delayable type of event.

Signed-Off-By: default avatarDavid Howells <dhowells@redhat.com>
parent 0f9005a6
......@@ -307,7 +307,7 @@ void mce_log_therm_throt_event(unsigned int cpu, __u64 status)
static int check_interval = 5 * 60; /* 5 minutes */
static void mcheck_timer(void *data);
static DECLARE_WORK(mcheck_work, mcheck_timer, NULL);
static DECLARE_DELAYED_WORK(mcheck_work, mcheck_timer, NULL);
static void mcheck_check_cpu(void *info)
{
......
......@@ -937,12 +937,9 @@ void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
return;
PREPARE_WORK(&ap->port_task, fn, data);
PREPARE_DELAYED_WORK(&ap->port_task, fn, data);
if (!delay)
rc = queue_work(ata_wq, &ap->port_task);
else
rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
/* rc == 0 means that another user is using port task */
WARN_ON(rc == 0);
......@@ -5320,8 +5317,8 @@ void ata_port_init(struct ata_port *ap, struct ata_host *host,
ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
#endif
INIT_WORK(&ap->port_task, NULL, NULL);
INIT_WORK(&ap->hotplug_task, ata_scsi_hotplug, ap);
INIT_DELAYED_WORK(&ap->port_task, NULL, NULL);
INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug, ap);
INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan, ap);
INIT_LIST_HEAD(&ap->eh_done_q);
init_waitqueue_head(&ap->eh_wait_q);
......
......@@ -332,7 +332,7 @@ void ata_scsi_error(struct Scsi_Host *host)
if (ap->pflags & ATA_PFLAG_LOADING)
ap->pflags &= ~ATA_PFLAG_LOADING;
else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG)
queue_work(ata_aux_wq, &ap->hotplug_task);
queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 0);
if (ap->pflags & ATA_PFLAG_RECOVERED)
ata_port_printk(ap, KERN_INFO, "EH complete\n");
......
......@@ -1424,7 +1424,7 @@ static unsigned int ip_cnt;
static void rekey_seq_generator(void *private_);
static DECLARE_WORK(rekey_work, rekey_seq_generator, NULL);
static DECLARE_DELAYED_WORK(rekey_work, rekey_seq_generator, NULL);
/*
* Lock avoidance:
......
......@@ -3580,7 +3580,7 @@ static void initialize_tty_struct(struct tty_struct *tty)
tty->overrun_time = jiffies;
tty->buf.head = tty->buf.tail = NULL;
tty_buffer_init(tty);
INIT_WORK(&tty->buf.work, flush_to_ldisc, tty);
INIT_DELAYED_WORK(&tty->buf.work, flush_to_ldisc, tty);
init_MUTEX(&tty->buf.pty_sem);
mutex_init(&tty->termios_mutex);
init_waitqueue_head(&tty->write_wait);
......
......@@ -227,7 +227,7 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
INIT_LIST_HEAD(&ctx->active_reqs);
INIT_LIST_HEAD(&ctx->run_list);
INIT_WORK(&ctx->wq, aio_kick_handler, ctx);
INIT_DELAYED_WORK(&ctx->wq, aio_kick_handler, ctx);
if (aio_setup_ring(ctx) < 0)
goto out_freectx;
......@@ -876,7 +876,7 @@ static void aio_kick_handler(void *data)
* we're in a worker thread already, don't use queue_delayed_work,
*/
if (requeue)
queue_work(aio_wq, &ctx->wq);
queue_delayed_work(aio_wq, &ctx->wq, 0);
}
......
......@@ -143,7 +143,7 @@ static struct nfs_client *nfs_alloc_client(const char *hostname,
INIT_LIST_HEAD(&clp->cl_state_owners);
INIT_LIST_HEAD(&clp->cl_unused);
spin_lock_init(&clp->cl_lock);
INIT_WORK(&clp->cl_renewd, nfs4_renew_state, clp);
INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state, clp);
rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
clp->cl_boot_time = CURRENT_TIME;
clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
......
......@@ -21,7 +21,8 @@
static void nfs_expire_automounts(void *list);
LIST_HEAD(nfs_automount_list);
static DECLARE_WORK(nfs_automount_task, nfs_expire_automounts, &nfs_automount_list);
static DECLARE_DELAYED_WORK(nfs_automount_task, nfs_expire_automounts,
&nfs_automount_list);
int nfs_mountpoint_expiry_timeout = 500 * HZ;
static struct vfsmount *nfs_do_submount(const struct vfsmount *mnt_parent,
......
......@@ -194,7 +194,7 @@ struct kioctx {
struct aio_ring_info ring_info;
struct work_struct wq;
struct delayed_work wq;
};
/* prototypes */
......
......@@ -158,7 +158,7 @@ static inline void con_schedule_flip(struct tty_struct *t)
if (t->buf.tail != NULL)
t->buf.tail->commit = t->buf.tail->used;
spin_unlock_irqrestore(&t->buf.lock, flags);
schedule_work(&t->buf.work);
schedule_delayed_work(&t->buf.work, 0);
}
#endif
......@@ -568,8 +568,8 @@ struct ata_port {
struct ata_host *host;
struct device *dev;
struct work_struct port_task;
struct work_struct hotplug_task;
struct delayed_work port_task;
struct delayed_work hotplug_task;
struct work_struct scsi_rescan_task;
unsigned int hsm_task_state;
......
......@@ -51,7 +51,7 @@ struct nfs_client {
unsigned long cl_lease_time;
unsigned long cl_last_renewal;
struct work_struct cl_renewd;
struct delayed_work cl_renewd;
struct rpc_wait_queue cl_rpcwaitq;
......
......@@ -30,7 +30,7 @@ struct rpc_inode {
#define RPC_PIPE_WAIT_FOR_OPEN 1
int flags;
struct rpc_pipe_ops *ops;
struct work_struct queue_timeout;
struct delayed_work queue_timeout;
};
static inline struct rpc_inode *
......
......@@ -177,7 +177,7 @@ struct rpc_xprt {
unsigned long connect_timeout,
bind_timeout,
reestablish_timeout;
struct work_struct connect_worker;
struct delayed_work connect_worker;
unsigned short port;
/*
......
......@@ -53,7 +53,7 @@ struct tty_buffer {
};
struct tty_bufhead {
struct work_struct work;
struct delayed_work work;
struct semaphore pty_sem;
spinlock_t lock;
struct tty_buffer *head; /* Queue head */
......
......@@ -17,6 +17,10 @@ struct work_struct {
void (*func)(void *);
void *data;
void *wq_data;
};
struct delayed_work {
struct work_struct work;
struct timer_list timer;
};
......@@ -28,32 +32,48 @@ struct execute_work {
.entry = { &(n).entry, &(n).entry }, \
.func = (f), \
.data = (d), \
}
#define __DELAYED_WORK_INITIALIZER(n, f, d) { \
.work = __WORK_INITIALIZER((n).work, (f), (d)), \
.timer = TIMER_INITIALIZER(NULL, 0, 0), \
}
#define DECLARE_WORK(n, f, d) \
struct work_struct n = __WORK_INITIALIZER(n, f, d)
#define DECLARE_DELAYED_WORK(n, f, d) \
struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, d)
/*
* initialize a work-struct's func and data pointers:
* initialize a work item's function and data pointers
*/
#define PREPARE_WORK(_work, _func, _data) \
do { \
(_work)->func = _func; \
(_work)->data = _data; \
(_work)->func = (_func); \
(_work)->data = (_data); \
} while (0)
#define PREPARE_DELAYED_WORK(_work, _func, _data) \
PREPARE_WORK(&(_work)->work, (_func), (_data))
/*
* initialize all of a work-struct:
* initialize all of a work item in one go
*/
#define INIT_WORK(_work, _func, _data) \
do { \
INIT_LIST_HEAD(&(_work)->entry); \
(_work)->pending = 0; \
PREPARE_WORK((_work), (_func), (_data)); \
} while (0)
#define INIT_DELAYED_WORK(_work, _func, _data) \
do { \
INIT_WORK(&(_work)->work, (_func), (_data)); \
init_timer(&(_work)->timer); \
} while (0)
extern struct workqueue_struct *__create_workqueue(const char *name,
int singlethread);
#define create_workqueue(name) __create_workqueue((name), 0)
......@@ -62,24 +82,24 @@ extern struct workqueue_struct *__create_workqueue(const char *name,
extern void destroy_workqueue(struct workqueue_struct *wq);
extern int FASTCALL(queue_work(struct workqueue_struct *wq, struct work_struct *work));
extern int FASTCALL(queue_delayed_work(struct workqueue_struct *wq, struct work_struct *work, unsigned long delay));
extern int FASTCALL(queue_delayed_work(struct workqueue_struct *wq, struct delayed_work *work, unsigned long delay));
extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
struct work_struct *work, unsigned long delay);
struct delayed_work *work, unsigned long delay);
extern void FASTCALL(flush_workqueue(struct workqueue_struct *wq));
extern int FASTCALL(schedule_work(struct work_struct *work));
extern int FASTCALL(schedule_delayed_work(struct work_struct *work, unsigned long delay));
extern int FASTCALL(schedule_delayed_work(struct delayed_work *work, unsigned long delay));
extern int schedule_delayed_work_on(int cpu, struct work_struct *work, unsigned long delay);
extern int schedule_delayed_work_on(int cpu, struct delayed_work *work, unsigned long delay);
extern int schedule_on_each_cpu(void (*func)(void *info), void *info);
extern void flush_scheduled_work(void);
extern int current_is_keventd(void);
extern int keventd_up(void);
extern void init_workqueues(void);
void cancel_rearming_delayed_work(struct work_struct *work);
void cancel_rearming_delayed_work(struct delayed_work *work);
void cancel_rearming_delayed_workqueue(struct workqueue_struct *,
struct work_struct *);
struct delayed_work *);
int execute_in_process_context(void (*fn)(void *), void *,
struct execute_work *);
......@@ -88,13 +108,13 @@ int execute_in_process_context(void (*fn)(void *), void *,
* function may still be running on return from cancel_delayed_work(). Run
* flush_scheduled_work() to wait on it.
*/
static inline int cancel_delayed_work(struct work_struct *work)
static inline int cancel_delayed_work(struct delayed_work *work)
{
int ret;
ret = del_timer_sync(&work->timer);
if (ret)
clear_bit(0, &work->pending);
clear_bit(0, &work->work.pending);
return ret;
}
......
......@@ -122,29 +122,33 @@ EXPORT_SYMBOL_GPL(queue_work);
static void delayed_work_timer_fn(unsigned long __data)
{
struct work_struct *work = (struct work_struct *)__data;
struct workqueue_struct *wq = work->wq_data;
struct delayed_work *dwork = (struct delayed_work *)__data;
struct workqueue_struct *wq = dwork->work.wq_data;
int cpu = smp_processor_id();
if (unlikely(is_single_threaded(wq)))
cpu = singlethread_cpu;
__queue_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
__queue_work(per_cpu_ptr(wq->cpu_wq, cpu), &dwork->work);
}
/**
* queue_delayed_work - queue work on a workqueue after delay
* @wq: workqueue to use
* @work: work to queue
* @work: delayable work to queue
* @delay: number of jiffies to wait before queueing
*
* Returns 0 if @work was already on a queue, non-zero otherwise.
*/
int fastcall queue_delayed_work(struct workqueue_struct *wq,
struct work_struct *work, unsigned long delay)
struct delayed_work *dwork, unsigned long delay)
{
int ret = 0;
struct timer_list *timer = &work->timer;
struct timer_list *timer = &dwork->timer;
struct work_struct *work = &dwork->work;
if (delay == 0)
return queue_work(wq, work);
if (!test_and_set_bit(0, &work->pending)) {
BUG_ON(timer_pending(timer));
......@@ -153,7 +157,7 @@ int fastcall queue_delayed_work(struct workqueue_struct *wq,
/* This stores wq for the moment, for the timer_fn */
work->wq_data = wq;
timer->expires = jiffies + delay;
timer->data = (unsigned long)work;
timer->data = (unsigned long)dwork;
timer->function = delayed_work_timer_fn;
add_timer(timer);
ret = 1;
......@@ -172,10 +176,11 @@ EXPORT_SYMBOL_GPL(queue_delayed_work);
* Returns 0 if @work was already on a queue, non-zero otherwise.
*/
int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
struct work_struct *work, unsigned long delay)
struct delayed_work *dwork, unsigned long delay)
{
int ret = 0;
struct timer_list *timer = &work->timer;
struct timer_list *timer = &dwork->timer;
struct work_struct *work = &dwork->work;
if (!test_and_set_bit(0, &work->pending)) {
BUG_ON(timer_pending(timer));
......@@ -184,7 +189,7 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
/* This stores wq for the moment, for the timer_fn */
work->wq_data = wq;
timer->expires = jiffies + delay;
timer->data = (unsigned long)work;
timer->data = (unsigned long)dwork;
timer->function = delayed_work_timer_fn;
add_timer_on(timer, cpu);
ret = 1;
......@@ -468,31 +473,31 @@ EXPORT_SYMBOL(schedule_work);
/**
* schedule_delayed_work - put work task in global workqueue after delay
* @work: job to be done
* @delay: number of jiffies to wait
* @dwork: job to be done
* @delay: number of jiffies to wait or 0 for immediate execution
*
* After waiting for a given time this puts a job in the kernel-global
* workqueue.
*/
int fastcall schedule_delayed_work(struct work_struct *work, unsigned long delay)
int fastcall schedule_delayed_work(struct delayed_work *dwork, unsigned long delay)
{
return queue_delayed_work(keventd_wq, work, delay);
return queue_delayed_work(keventd_wq, dwork, delay);
}
EXPORT_SYMBOL(schedule_delayed_work);
/**
* schedule_delayed_work_on - queue work in global workqueue on CPU after delay
* @cpu: cpu to use
* @work: job to be done
* @dwork: job to be done
* @delay: number of jiffies to wait
*
* After waiting for a given time this puts a job in the kernel-global
* workqueue on the specified CPU.
*/
int schedule_delayed_work_on(int cpu,
struct work_struct *work, unsigned long delay)
struct delayed_work *dwork, unsigned long delay)
{
return queue_delayed_work_on(cpu, keventd_wq, work, delay);
return queue_delayed_work_on(cpu, keventd_wq, dwork, delay);
}
EXPORT_SYMBOL(schedule_delayed_work_on);
......@@ -539,12 +544,12 @@ EXPORT_SYMBOL(flush_scheduled_work);
* cancel_rearming_delayed_workqueue - reliably kill off a delayed
* work whose handler rearms the delayed work.
* @wq: the controlling workqueue structure
* @work: the delayed work struct
* @dwork: the delayed work struct
*/
void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
struct work_struct *work)
struct delayed_work *dwork)
{
while (!cancel_delayed_work(work))
while (!cancel_delayed_work(dwork))
flush_workqueue(wq);
}
EXPORT_SYMBOL(cancel_rearming_delayed_workqueue);
......@@ -552,11 +557,11 @@ EXPORT_SYMBOL(cancel_rearming_delayed_workqueue);
/**
* cancel_rearming_delayed_work - reliably kill off a delayed keventd
* work whose handler rearms the delayed work.
* @work: the delayed work struct
* @dwork: the delayed work struct
*/
void cancel_rearming_delayed_work(struct work_struct *work)
void cancel_rearming_delayed_work(struct delayed_work *dwork)
{
cancel_rearming_delayed_workqueue(keventd_wq, work);
cancel_rearming_delayed_workqueue(keventd_wq, dwork);
}
EXPORT_SYMBOL(cancel_rearming_delayed_work);
......
......@@ -753,7 +753,7 @@ int slab_is_available(void)
return g_cpucache_up == FULL;
}
static DEFINE_PER_CPU(struct work_struct, reap_work);
static DEFINE_PER_CPU(struct delayed_work, reap_work);
static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep)
{
......@@ -916,16 +916,16 @@ static void next_reap_node(void)
*/
static void __devinit start_cpu_timer(int cpu)
{
struct work_struct *reap_work = &per_cpu(reap_work, cpu);
struct delayed_work *reap_work = &per_cpu(reap_work, cpu);
/*
* When this gets called from do_initcalls via cpucache_init(),
* init_workqueues() has already run, so keventd will be setup
* at that time.
*/
if (keventd_up() && reap_work->func == NULL) {
if (keventd_up() && reap_work->work.func == NULL) {
init_reap_node(cpu);
INIT_WORK(reap_work, cache_reap, NULL);
INIT_DELAYED_WORK(reap_work, cache_reap, NULL);
schedule_delayed_work_on(cpu, reap_work, HZ + 3 * cpu);
}
}
......
......@@ -35,7 +35,7 @@ static unsigned long linkwatch_flags;
static unsigned long linkwatch_nextevent;
static void linkwatch_event(void *dummy);
static DECLARE_WORK(linkwatch_work, linkwatch_event, NULL);
static DECLARE_DELAYED_WORK(linkwatch_work, linkwatch_event, NULL);
static LIST_HEAD(lweventlist);
static DEFINE_SPINLOCK(lweventlist_lock);
......@@ -171,10 +171,9 @@ void linkwatch_fire_event(struct net_device *dev)
unsigned long delay = linkwatch_nextevent - jiffies;
/* If we wrap around we'll delay it by at most HZ. */
if (!delay || delay > HZ)
schedule_work(&linkwatch_work);
else
schedule_delayed_work(&linkwatch_work, delay);
if (delay > HZ)
delay = 0;
schedule_delayed_work(&linkwatch_work, delay);
}
}
}
......
......@@ -285,7 +285,7 @@ static struct file_operations content_file_operations;
static struct file_operations cache_flush_operations;
static void do_cache_clean(void *data);
static DECLARE_WORK(cache_cleaner, do_cache_clean, NULL);
static DECLARE_DELAYED_WORK(cache_cleaner, do_cache_clean, NULL);
void cache_register(struct cache_detail *cd)
{
......@@ -337,7 +337,7 @@ void cache_register(struct cache_detail *cd)
spin_unlock(&cache_list_lock);
/* start the cleaning process */
schedule_work(&cache_cleaner);
schedule_delayed_work(&cache_cleaner, 0);
}
int cache_unregister(struct cache_detail *cd)
......
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