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Message-Id: <4ea674e8825ed09b554e.1170193184@tetsuo.zabbo.net>
Date: Tue, 30 Jan 2007 13:39:44 -0700
From: Zach Brown <zach.brown@...cle.com>
To: linux-kernel@...r.kernel.org
Cc: linux-aio@...ck.org, Suparna Bhattacharya <suparna@...ibm.com>,
Benjamin LaHaise <bcrl@...ck.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 3 of 4] Teach paths to wake a specific void * target instead
of a whole task_struct
The addition of multiple sleeping fibrils under a task_struct means that we
can't simply wake a task_struct to be able to wake a specific sleeping code
path.
This patch introduces task_wake_target() as a way to refer to a code path that
is about to sleep and will be woken in the future. Sleepers that used to wake
a current task_struct reference with wake_up_process() now use this helper to
get a wake target cookie and wake it with wake_up_target().
Some paths know that waking a task will be sufficient. Paths working with
kernel threads that never use fibrils fall into this category. They're changed
to use wake_up_task() instead of wake_up_process().
This is not an exhaustive patch. It isn't yet clear how signals are going to
interract with fibrils. Once that is decided callers of wake_up_state() are
going to need to reflect the desired behaviour. I add __deprecated to it to
highlight this detail.
The actual act of performing the wake-up is hidden under try_to_wake_up() and
is serialized with the scheduler under the runqueue lock. This is very
fiddly stuff. I'm sure I've missed some details. I've tried to comment
the intent above try_to_wake_up_fibril().
diff -r df7bc026d50e -r 4ea674e8825e arch/i386/kernel/ptrace.c
--- a/arch/i386/kernel/ptrace.c Mon Jan 29 15:36:16 2007 -0800
+++ b/arch/i386/kernel/ptrace.c Mon Jan 29 15:46:47 2007 -0800
@@ -492,7 +492,7 @@ long arch_ptrace(struct task_struct *chi
child->exit_code = data;
/* make sure the single step bit is not set. */
clear_singlestep(child);
- wake_up_process(child);
+ wake_up_task(child);
ret = 0;
break;
@@ -508,7 +508,7 @@ long arch_ptrace(struct task_struct *chi
child->exit_code = SIGKILL;
/* make sure the single step bit is not set. */
clear_singlestep(child);
- wake_up_process(child);
+ wake_up_task(child);
break;
case PTRACE_SYSEMU_SINGLESTEP: /* Same as SYSEMU, but singlestep if not syscall */
@@ -526,7 +526,7 @@ long arch_ptrace(struct task_struct *chi
set_singlestep(child);
child->exit_code = data;
/* give it a chance to run. */
- wake_up_process(child);
+ wake_up_task(child);
ret = 0;
break;
diff -r df7bc026d50e -r 4ea674e8825e drivers/block/loop.c
--- a/drivers/block/loop.c Mon Jan 29 15:36:16 2007 -0800
+++ b/drivers/block/loop.c Mon Jan 29 15:46:47 2007 -0800
@@ -824,7 +824,7 @@ static int loop_set_fd(struct loop_devic
goto out_clr;
}
lo->lo_state = Lo_bound;
- wake_up_process(lo->lo_thread);
+ wake_up_task(lo->lo_thread);
return 0;
out_clr:
diff -r df7bc026d50e -r 4ea674e8825e drivers/md/dm-io.c
--- a/drivers/md/dm-io.c Mon Jan 29 15:36:16 2007 -0800
+++ b/drivers/md/dm-io.c Mon Jan 29 15:46:47 2007 -0800
@@ -18,7 +18,7 @@ struct io {
struct io {
unsigned long error;
atomic_t count;
- struct task_struct *sleeper;
+ void *wake_target;
io_notify_fn callback;
void *context;
};
@@ -110,8 +110,8 @@ static void dec_count(struct io *io, uns
set_bit(region, &io->error);
if (atomic_dec_and_test(&io->count)) {
- if (io->sleeper)
- wake_up_process(io->sleeper);
+ if (io->wake_target)
+ wake_up_task(io->wake_target);
else {
int r = io->error;
@@ -323,7 +323,7 @@ static int sync_io(unsigned int num_regi
io.error = 0;
atomic_set(&io.count, 1); /* see dispatch_io() */
- io.sleeper = current;
+ io.wake_target = task_wake_target(current);
dispatch_io(rw, num_regions, where, dp, &io, 1);
@@ -358,7 +358,7 @@ static int async_io(unsigned int num_reg
io = mempool_alloc(_io_pool, GFP_NOIO);
io->error = 0;
atomic_set(&io->count, 1); /* see dispatch_io() */
- io->sleeper = NULL;
+ io->wake_target = NULL;
io->callback = fn;
io->context = context;
diff -r df7bc026d50e -r 4ea674e8825e drivers/scsi/qla2xxx/qla_os.c
--- a/drivers/scsi/qla2xxx/qla_os.c Mon Jan 29 15:36:16 2007 -0800
+++ b/drivers/scsi/qla2xxx/qla_os.c Mon Jan 29 15:46:47 2007 -0800
@@ -2403,7 +2403,7 @@ qla2xxx_wake_dpc(scsi_qla_host_t *ha)
qla2xxx_wake_dpc(scsi_qla_host_t *ha)
{
if (ha->dpc_thread)
- wake_up_process(ha->dpc_thread);
+ wake_up_task(ha->dpc_thread);
}
/*
diff -r df7bc026d50e -r 4ea674e8825e drivers/scsi/scsi_error.c
--- a/drivers/scsi/scsi_error.c Mon Jan 29 15:36:16 2007 -0800
+++ b/drivers/scsi/scsi_error.c Mon Jan 29 15:46:47 2007 -0800
@@ -51,7 +51,7 @@ void scsi_eh_wakeup(struct Scsi_Host *sh
void scsi_eh_wakeup(struct Scsi_Host *shost)
{
if (shost->host_busy == shost->host_failed) {
- wake_up_process(shost->ehandler);
+ wake_up_task(shost->ehandler);
SCSI_LOG_ERROR_RECOVERY(5,
printk("Waking error handler thread\n"));
}
diff -r df7bc026d50e -r 4ea674e8825e fs/aio.c
--- a/fs/aio.c Mon Jan 29 15:36:16 2007 -0800
+++ b/fs/aio.c Mon Jan 29 15:46:47 2007 -0800
@@ -907,7 +907,7 @@ void fastcall kick_iocb(struct kiocb *io
* single context. */
if (is_sync_kiocb(iocb)) {
kiocbSetKicked(iocb);
- wake_up_process(iocb->ki_obj.tsk);
+ wake_up_target(iocb->ki_obj.wake_target);
return;
}
@@ -941,7 +941,7 @@ int fastcall aio_complete(struct kiocb *
BUG_ON(iocb->ki_users != 1);
iocb->ki_user_data = res;
iocb->ki_users = 0;
- wake_up_process(iocb->ki_obj.tsk);
+ wake_up_target(iocb->ki_obj.wake_target);
return 1;
}
@@ -1053,7 +1053,7 @@ struct aio_timeout {
struct aio_timeout {
struct timer_list timer;
int timed_out;
- struct task_struct *p;
+ void *wake_target;
};
static void timeout_func(unsigned long data)
@@ -1061,7 +1061,7 @@ static void timeout_func(unsigned long d
struct aio_timeout *to = (struct aio_timeout *)data;
to->timed_out = 1;
- wake_up_process(to->p);
+ wake_up_target(to->wake_target);
}
static inline void init_timeout(struct aio_timeout *to)
@@ -1070,7 +1070,7 @@ static inline void init_timeout(struct a
to->timer.data = (unsigned long)to;
to->timer.function = timeout_func;
to->timed_out = 0;
- to->p = current;
+ to->wake_target = task_wake_target(current);
}
static inline void set_timeout(long start_jiffies, struct aio_timeout *to,
diff -r df7bc026d50e -r 4ea674e8825e fs/direct-io.c
--- a/fs/direct-io.c Mon Jan 29 15:36:16 2007 -0800
+++ b/fs/direct-io.c Mon Jan 29 15:46:47 2007 -0800
@@ -124,7 +124,7 @@ struct dio {
spinlock_t bio_lock; /* protects BIO fields below */
unsigned long refcount; /* direct_io_worker() and bios */
struct bio *bio_list; /* singly linked via bi_private */
- struct task_struct *waiter; /* waiting task (NULL if none) */
+ void *wake_target; /* waiting initiator (NULL if none) */
/* AIO related stuff */
struct kiocb *iocb; /* kiocb */
@@ -278,8 +278,8 @@ static int dio_bio_end_aio(struct bio *b
spin_lock_irqsave(&dio->bio_lock, flags);
remaining = --dio->refcount;
- if (remaining == 1 && dio->waiter)
- wake_up_process(dio->waiter);
+ if (remaining == 1 && dio->wake_target)
+ wake_up_target(dio->wake_target);
spin_unlock_irqrestore(&dio->bio_lock, flags);
if (remaining == 0) {
@@ -309,8 +309,8 @@ static int dio_bio_end_io(struct bio *bi
spin_lock_irqsave(&dio->bio_lock, flags);
bio->bi_private = dio->bio_list;
dio->bio_list = bio;
- if (--dio->refcount == 1 && dio->waiter)
- wake_up_process(dio->waiter);
+ if (--dio->refcount == 1 && dio->wake_target)
+ wake_up_target(dio->wake_target);
spin_unlock_irqrestore(&dio->bio_lock, flags);
return 0;
}
@@ -393,12 +393,12 @@ static struct bio *dio_await_one(struct
*/
while (dio->refcount > 1 && dio->bio_list == NULL) {
__set_current_state(TASK_UNINTERRUPTIBLE);
- dio->waiter = current;
+ dio->wake_target = task_wake_target(current);
spin_unlock_irqrestore(&dio->bio_lock, flags);
io_schedule();
/* wake up sets us TASK_RUNNING */
spin_lock_irqsave(&dio->bio_lock, flags);
- dio->waiter = NULL;
+ dio->wake_target = NULL;
}
if (dio->bio_list) {
bio = dio->bio_list;
@@ -990,7 +990,7 @@ direct_io_worker(int rw, struct kiocb *i
spin_lock_init(&dio->bio_lock);
dio->refcount = 1;
dio->bio_list = NULL;
- dio->waiter = NULL;
+ dio->wake_target = NULL;
/*
* In case of non-aligned buffers, we may need 2 more
diff -r df7bc026d50e -r 4ea674e8825e fs/jbd/journal.c
--- a/fs/jbd/journal.c Mon Jan 29 15:36:16 2007 -0800
+++ b/fs/jbd/journal.c Mon Jan 29 15:46:47 2007 -0800
@@ -94,7 +94,7 @@ static void commit_timeout(unsigned long
{
struct task_struct * p = (struct task_struct *) __data;
- wake_up_process(p);
+ wake_up_task(p);
}
/*
diff -r df7bc026d50e -r 4ea674e8825e include/linux/aio.h
--- a/include/linux/aio.h Mon Jan 29 15:36:16 2007 -0800
+++ b/include/linux/aio.h Mon Jan 29 15:46:47 2007 -0800
@@ -98,7 +98,7 @@ struct kiocb {
union {
void __user *user;
- struct task_struct *tsk;
+ void *wake_target;
} ki_obj;
__u64 ki_user_data; /* user's data for completion */
@@ -124,7 +124,6 @@ struct kiocb {
#define is_sync_kiocb(iocb) ((iocb)->ki_key == KIOCB_SYNC_KEY)
#define init_sync_kiocb(x, filp) \
do { \
- struct task_struct *tsk = current; \
(x)->ki_flags = 0; \
(x)->ki_users = 1; \
(x)->ki_key = KIOCB_SYNC_KEY; \
@@ -133,7 +132,7 @@ struct kiocb {
(x)->ki_cancel = NULL; \
(x)->ki_retry = NULL; \
(x)->ki_dtor = NULL; \
- (x)->ki_obj.tsk = tsk; \
+ (x)->ki_obj.wake_target = task_wake_target(current); \
(x)->ki_user_data = 0; \
init_wait((&(x)->ki_wait)); \
} while (0)
diff -r df7bc026d50e -r 4ea674e8825e include/linux/freezer.h
--- a/include/linux/freezer.h Mon Jan 29 15:36:16 2007 -0800
+++ b/include/linux/freezer.h Mon Jan 29 15:46:47 2007 -0800
@@ -42,7 +42,7 @@ static inline int thaw_process(struct ta
{
if (frozen(p)) {
p->flags &= ~PF_FROZEN;
- wake_up_process(p);
+ wake_up_task(p);
return 1;
}
return 0;
diff -r df7bc026d50e -r 4ea674e8825e include/linux/hrtimer.h
--- a/include/linux/hrtimer.h Mon Jan 29 15:36:16 2007 -0800
+++ b/include/linux/hrtimer.h Mon Jan 29 15:46:47 2007 -0800
@@ -65,7 +65,7 @@ struct hrtimer {
*/
struct hrtimer_sleeper {
struct hrtimer timer;
- struct task_struct *task;
+ void *wake_target;
};
/**
diff -r df7bc026d50e -r 4ea674e8825e include/linux/kthread.h
--- a/include/linux/kthread.h Mon Jan 29 15:36:16 2007 -0800
+++ b/include/linux/kthread.h Mon Jan 29 15:46:47 2007 -0800
@@ -22,7 +22,7 @@ struct task_struct *kthread_create(int (
struct task_struct *__k \
= kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \
if (!IS_ERR(__k)) \
- wake_up_process(__k); \
+ wake_up_task(__k); \
__k; \
})
diff -r df7bc026d50e -r 4ea674e8825e include/linux/module.h
--- a/include/linux/module.h Mon Jan 29 15:36:16 2007 -0800
+++ b/include/linux/module.h Mon Jan 29 15:46:47 2007 -0800
@@ -334,7 +334,7 @@ struct module
struct list_head modules_which_use_me;
/* Who is waiting for us to be unloaded */
- struct task_struct *waiter;
+ void *wake_target;
/* Destruction function. */
void (*exit)(void);
diff -r df7bc026d50e -r 4ea674e8825e include/linux/mutex.h
--- a/include/linux/mutex.h Mon Jan 29 15:36:16 2007 -0800
+++ b/include/linux/mutex.h Mon Jan 29 15:46:47 2007 -0800
@@ -65,7 +65,7 @@ struct mutex {
*/
struct mutex_waiter {
struct list_head list;
- struct task_struct *task;
+ void *wake_target;
#ifdef CONFIG_DEBUG_MUTEXES
struct mutex *lock;
void *magic;
diff -r df7bc026d50e -r 4ea674e8825e include/linux/posix-timers.h
--- a/include/linux/posix-timers.h Mon Jan 29 15:36:16 2007 -0800
+++ b/include/linux/posix-timers.h Mon Jan 29 15:46:47 2007 -0800
@@ -48,6 +48,7 @@ struct k_itimer {
int it_sigev_signo; /* signo word of sigevent struct */
sigval_t it_sigev_value; /* value word of sigevent struct */
struct task_struct *it_process; /* process to send signal to */
+ void *it_wake_target; /* wake target for nanosleep case */
struct sigqueue *sigq; /* signal queue entry. */
union {
struct {
diff -r df7bc026d50e -r 4ea674e8825e include/linux/sched.h
--- a/include/linux/sched.h Mon Jan 29 15:36:16 2007 -0800
+++ b/include/linux/sched.h Mon Jan 29 15:46:47 2007 -0800
@@ -1338,8 +1338,14 @@ extern void switch_uid(struct user_struc
extern void do_timer(unsigned long ticks);
-extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
-extern int FASTCALL(wake_up_process(struct task_struct * tsk));
+/*
+ * XXX We need to figure out how signal delivery will wake the fibrils in
+ * a task. This is marked deprecated so that we get a compile-time warning
+ * to worry about it.
+ */
+extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)) __deprecated;
+extern int FASTCALL(wake_up_target(void *wake_target));
+extern int FASTCALL(wake_up_task(struct task_struct *task));
extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
unsigned long clone_flags));
#ifdef CONFIG_SMP
diff -r df7bc026d50e -r 4ea674e8825e include/linux/sem.h
--- a/include/linux/sem.h Mon Jan 29 15:36:16 2007 -0800
+++ b/include/linux/sem.h Mon Jan 29 15:46:47 2007 -0800
@@ -104,7 +104,7 @@ struct sem_queue {
struct sem_queue {
struct sem_queue * next; /* next entry in the queue */
struct sem_queue ** prev; /* previous entry in the queue, *(q->prev) == q */
- struct task_struct* sleeper; /* this process */
+ void *wake_target;
struct sem_undo * undo; /* undo structure */
int pid; /* process id of requesting process */
int status; /* completion status of operation */
diff -r df7bc026d50e -r 4ea674e8825e include/linux/wait.h
--- a/include/linux/wait.h Mon Jan 29 15:36:16 2007 -0800
+++ b/include/linux/wait.h Mon Jan 29 15:46:47 2007 -0800
@@ -54,13 +54,16 @@ typedef struct __wait_queue_head wait_qu
typedef struct __wait_queue_head wait_queue_head_t;
struct task_struct;
+/* XXX sigh, wait.h <-> sched.h have some fun ordering */
+void *task_wake_target(struct task_struct *task);
+struct task_struct *wake_target_to_task(void *wake_target);
/*
* Macros for declaration and initialisaton of the datatypes
*/
#define __WAITQUEUE_INITIALIZER(name, tsk) { \
- .private = tsk, \
+ .private = task_wake_target(tsk), \
.func = default_wake_function, \
.task_list = { NULL, NULL } }
@@ -91,7 +94,7 @@ static inline void init_waitqueue_entry(
static inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p)
{
q->flags = 0;
- q->private = p;
+ q->private = task_wake_target(p);
q->func = default_wake_function;
}
@@ -389,7 +392,7 @@ int wake_bit_function(wait_queue_t *wait
#define DEFINE_WAIT(name) \
wait_queue_t name = { \
- .private = current, \
+ .private = task_wake_target(current), \
.func = autoremove_wake_function, \
.task_list = LIST_HEAD_INIT((name).task_list), \
}
@@ -398,7 +401,7 @@ int wake_bit_function(wait_queue_t *wait
struct wait_bit_queue name = { \
.key = __WAIT_BIT_KEY_INITIALIZER(word, bit), \
.wait = { \
- .private = current, \
+ .private = task_wake_target(current), \
.func = wake_bit_function, \
.task_list = \
LIST_HEAD_INIT((name).wait.task_list), \
@@ -407,7 +410,7 @@ int wake_bit_function(wait_queue_t *wait
#define init_wait(wait) \
do { \
- (wait)->private = current; \
+ (wait)->private = task_wake_target(current); \
(wait)->func = autoremove_wake_function; \
INIT_LIST_HEAD(&(wait)->task_list); \
} while (0)
diff -r df7bc026d50e -r 4ea674e8825e ipc/mqueue.c
--- a/ipc/mqueue.c Mon Jan 29 15:36:16 2007 -0800
+++ b/ipc/mqueue.c Mon Jan 29 15:46:47 2007 -0800
@@ -58,7 +58,7 @@
struct ext_wait_queue { /* queue of sleeping tasks */
- struct task_struct *task;
+ void *wake_target;
struct list_head list;
struct msg_msg *msg; /* ptr of loaded message */
int state; /* one of STATE_* values */
@@ -394,10 +394,11 @@ static void wq_add(struct mqueue_inode_i
{
struct ext_wait_queue *walk;
- ewp->task = current;
+ ewp->wake_target = task_wake_target(current);
list_for_each_entry(walk, &info->e_wait_q[sr].list, list) {
- if (walk->task->static_prio <= current->static_prio) {
+ if (wake_target_to_task(walk->wake_target)->static_prio
+ <= current->static_prio) {
list_add_tail(&ewp->list, &walk->list);
return;
}
@@ -785,7 +786,7 @@ static inline void pipelined_send(struct
receiver->msg = message;
list_del(&receiver->list);
receiver->state = STATE_PENDING;
- wake_up_process(receiver->task);
+ wake_up_target(receiver->wake_target);
smp_wmb();
receiver->state = STATE_READY;
}
@@ -804,7 +805,7 @@ static inline void pipelined_receive(str
msg_insert(sender->msg, info);
list_del(&sender->list);
sender->state = STATE_PENDING;
- wake_up_process(sender->task);
+ wake_up_target(sender->wake_target);
smp_wmb();
sender->state = STATE_READY;
}
@@ -869,7 +870,7 @@ asmlinkage long sys_mq_timedsend(mqd_t m
spin_unlock(&info->lock);
ret = timeout;
} else {
- wait.task = current;
+ wait.wake_target = task_wake_target(current);
wait.msg = (void *) msg_ptr;
wait.state = STATE_NONE;
ret = wq_sleep(info, SEND, timeout, &wait);
@@ -944,7 +945,7 @@ asmlinkage ssize_t sys_mq_timedreceive(m
ret = timeout;
msg_ptr = NULL;
} else {
- wait.task = current;
+ wait.wake_target = task_wake_target(current);
wait.state = STATE_NONE;
ret = wq_sleep(info, RECV, timeout, &wait);
msg_ptr = wait.msg;
diff -r df7bc026d50e -r 4ea674e8825e ipc/msg.c
--- a/ipc/msg.c Mon Jan 29 15:36:16 2007 -0800
+++ b/ipc/msg.c Mon Jan 29 15:46:47 2007 -0800
@@ -46,7 +46,7 @@
*/
struct msg_receiver {
struct list_head r_list;
- struct task_struct *r_tsk;
+ struct task_struct *r_wake_target;
int r_mode;
long r_msgtype;
@@ -58,7 +58,7 @@ struct msg_receiver {
/* one msg_sender for each sleeping sender */
struct msg_sender {
struct list_head list;
- struct task_struct *tsk;
+ void *wake_target;
};
#define SEARCH_ANY 1
@@ -180,7 +180,7 @@ static int newque (struct ipc_namespace
static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss)
{
- mss->tsk = current;
+ mss->wake_target = task_wake_target(current);
current->state = TASK_INTERRUPTIBLE;
list_add_tail(&mss->list, &msq->q_senders);
}
@@ -203,7 +203,7 @@ static void ss_wakeup(struct list_head *
tmp = tmp->next;
if (kill)
mss->list.next = NULL;
- wake_up_process(mss->tsk);
+ wake_up_target(mss->wake_target);
}
}
@@ -218,7 +218,7 @@ static void expunge_all(struct msg_queue
msr = list_entry(tmp, struct msg_receiver, r_list);
tmp = tmp->next;
msr->r_msg = NULL;
- wake_up_process(msr->r_tsk);
+ wake_up_target(msr->r_wake_target);
smp_mb();
msr->r_msg = ERR_PTR(res);
}
@@ -602,20 +602,21 @@ static inline int pipelined_send(struct
msr = list_entry(tmp, struct msg_receiver, r_list);
tmp = tmp->next;
if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
- !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
- msr->r_msgtype, msr->r_mode)) {
+ !security_msg_queue_msgrcv(msq, msg,
+ wake_target_to_task(msr->r_wake_target),
+ msr->r_msgtype, msr->r_mode)) {
list_del(&msr->r_list);
if (msr->r_maxsize < msg->m_ts) {
msr->r_msg = NULL;
- wake_up_process(msr->r_tsk);
+ wake_up_target(msr->r_wake_target);
smp_mb();
msr->r_msg = ERR_PTR(-E2BIG);
} else {
msr->r_msg = NULL;
- msq->q_lrpid = msr->r_tsk->pid;
+ msq->q_lrpid = wake_target_to_task(msr->r_wake_target)->pid;
msq->q_rtime = get_seconds();
- wake_up_process(msr->r_tsk);
+ wake_up_target(msr->r_wake_target);
smp_mb();
msr->r_msg = msg;
@@ -826,7 +827,7 @@ long do_msgrcv(int msqid, long *pmtype,
goto out_unlock;
}
list_add_tail(&msr_d.r_list, &msq->q_receivers);
- msr_d.r_tsk = current;
+ msr_d.r_wake_target = task_wake_target(current);
msr_d.r_msgtype = msgtyp;
msr_d.r_mode = mode;
if (msgflg & MSG_NOERROR)
diff -r df7bc026d50e -r 4ea674e8825e ipc/sem.c
--- a/ipc/sem.c Mon Jan 29 15:36:16 2007 -0800
+++ b/ipc/sem.c Mon Jan 29 15:46:47 2007 -0800
@@ -411,7 +411,7 @@ static void update_queue (struct sem_arr
error = try_atomic_semop(sma, q->sops, q->nsops,
q->undo, q->pid);
- /* Does q->sleeper still need to sleep? */
+ /* Does q->wake_target still need to sleep? */
if (error <= 0) {
struct sem_queue *n;
remove_from_queue(sma,q);
@@ -431,7 +431,7 @@ static void update_queue (struct sem_arr
n = sma->sem_pending;
else
n = q->next;
- wake_up_process(q->sleeper);
+ wake_up_target(q->wake_target);
/* hands-off: q will disappear immediately after
* writing q->status.
*/
@@ -515,7 +515,7 @@ static void freeary (struct ipc_namespac
q->prev = NULL;
n = q->next;
q->status = IN_WAKEUP;
- wake_up_process(q->sleeper); /* doesn't sleep */
+ wake_up_target(q->wake_target); /* doesn't sleep */
smp_wmb();
q->status = -EIDRM; /* hands-off q */
q = n;
@@ -1223,7 +1223,7 @@ retry_undos:
prepend_to_queue(sma ,&queue);
queue.status = -EINTR;
- queue.sleeper = current;
+ queue.wake_target = task_wake_target(current);
current->state = TASK_INTERRUPTIBLE;
sem_unlock(sma);
diff -r df7bc026d50e -r 4ea674e8825e kernel/exit.c
--- a/kernel/exit.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/exit.c Mon Jan 29 15:46:47 2007 -0800
@@ -91,7 +91,7 @@ static void __exit_signal(struct task_st
* then notify it:
*/
if (sig->group_exit_task && atomic_read(&sig->count) == sig->notify_count) {
- wake_up_process(sig->group_exit_task);
+ wake_up_task(sig->group_exit_task);
sig->group_exit_task = NULL;
}
if (tsk == sig->curr_target)
diff -r df7bc026d50e -r 4ea674e8825e kernel/hrtimer.c
--- a/kernel/hrtimer.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/hrtimer.c Mon Jan 29 15:46:47 2007 -0800
@@ -660,11 +660,11 @@ static int hrtimer_wakeup(struct hrtimer
{
struct hrtimer_sleeper *t =
container_of(timer, struct hrtimer_sleeper, timer);
- struct task_struct *task = t->task;
-
- t->task = NULL;
- if (task)
- wake_up_process(task);
+ void *wake_target = t->wake_target;
+
+ t->wake_target = NULL;
+ if (wake_target)
+ wake_up_target(wake_target);
return HRTIMER_NORESTART;
}
@@ -672,7 +672,7 @@ void hrtimer_init_sleeper(struct hrtimer
void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
{
sl->timer.function = hrtimer_wakeup;
- sl->task = task;
+ sl->wake_target = task_wake_target(task);
}
static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
@@ -688,9 +688,9 @@ static int __sched do_nanosleep(struct h
hrtimer_cancel(&t->timer);
mode = HRTIMER_ABS;
- } while (t->task && !signal_pending(current));
-
- return t->task == NULL;
+ } while (t->wake_target && !signal_pending(current));
+
+ return t->wake_target == NULL;
}
long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
diff -r df7bc026d50e -r 4ea674e8825e kernel/kthread.c
--- a/kernel/kthread.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/kthread.c Mon Jan 29 15:46:47 2007 -0800
@@ -232,7 +232,7 @@ int kthread_stop(struct task_struct *k)
/* Now set kthread_should_stop() to true, and wake it up. */
kthread_stop_info.k = k;
- wake_up_process(k);
+ wake_up_task(k);
put_task_struct(k);
/* Once it dies, reset stop ptr, gather result and we're done. */
diff -r df7bc026d50e -r 4ea674e8825e kernel/module.c
--- a/kernel/module.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/module.c Mon Jan 29 15:46:47 2007 -0800
@@ -508,7 +508,7 @@ static void module_unload_init(struct mo
/* Hold reference count during initialization. */
local_set(&mod->ref[raw_smp_processor_id()].count, 1);
/* Backwards compatibility macros put refcount during init. */
- mod->waiter = current;
+ mod->wake_target = task_wake_target(current);
}
/* modules using other modules */
@@ -699,7 +699,7 @@ sys_delete_module(const char __user *nam
}
/* Set this up before setting mod->state */
- mod->waiter = current;
+ mod->wake_target = task_wake_target(current);
/* Stop the machine so refcounts can't move and disable module. */
ret = try_stop_module(mod, flags, &forced);
@@ -797,7 +797,7 @@ void module_put(struct module *module)
local_dec(&module->ref[cpu].count);
/* Maybe they're waiting for us to drop reference? */
if (unlikely(!module_is_live(module)))
- wake_up_process(module->waiter);
+ wake_up_target(module->wake_target);
put_cpu();
}
}
diff -r df7bc026d50e -r 4ea674e8825e kernel/mutex-debug.c
--- a/kernel/mutex-debug.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/mutex-debug.c Mon Jan 29 15:46:47 2007 -0800
@@ -53,6 +53,7 @@ void debug_mutex_free_waiter(struct mute
memset(waiter, MUTEX_DEBUG_FREE, sizeof(*waiter));
}
+#warning "this is going to need updating for fibrils"
void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter,
struct thread_info *ti)
{
@@ -67,12 +68,12 @@ void mutex_remove_waiter(struct mutex *l
struct thread_info *ti)
{
DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list));
- DEBUG_LOCKS_WARN_ON(waiter->task != ti->task);
+ DEBUG_LOCKS_WARN_ON(waiter->wake_target != task_wake_target(ti->task));
DEBUG_LOCKS_WARN_ON(ti->task->blocked_on != waiter);
ti->task->blocked_on = NULL;
list_del_init(&waiter->list);
- waiter->task = NULL;
+ waiter->wake_target = NULL;
}
void debug_mutex_unlock(struct mutex *lock)
diff -r df7bc026d50e -r 4ea674e8825e kernel/mutex.c
--- a/kernel/mutex.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/mutex.c Mon Jan 29 15:46:47 2007 -0800
@@ -137,7 +137,7 @@ __mutex_lock_common(struct mutex *lock,
/* add waiting tasks to the end of the waitqueue (FIFO): */
list_add_tail(&waiter.list, &lock->wait_list);
- waiter.task = task;
+ waiter.wake_target = task_wake_target(task);
for (;;) {
/*
@@ -246,7 +246,7 @@ __mutex_unlock_common_slowpath(atomic_t
debug_mutex_wake_waiter(lock, waiter);
- wake_up_process(waiter->task);
+ wake_up_target(waiter->wake_target);
}
debug_mutex_clear_owner(lock);
diff -r df7bc026d50e -r 4ea674e8825e kernel/posix-cpu-timers.c
--- a/kernel/posix-cpu-timers.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/posix-cpu-timers.c Mon Jan 29 15:46:47 2007 -0800
@@ -673,7 +673,7 @@ static void cpu_timer_fire(struct k_itim
* This a special case for clock_nanosleep,
* not a normal timer from sys_timer_create.
*/
- wake_up_process(timer->it_process);
+ wake_up_target(timer->it_wake_target);
timer->it.cpu.expires.sched = 0;
} else if (timer->it.cpu.incr.sched == 0) {
/*
@@ -1423,6 +1423,12 @@ static int do_cpu_nanosleep(const clocki
timer.it_overrun = -1;
error = posix_cpu_timer_create(&timer);
timer.it_process = current;
+ /*
+ * XXX This isn't quite right, but the rest of the it_process users
+ * fall under the currently unresolved question of how signal delivery
+ * will behave.
+ */
+ timer.it_wake_target = task_wake_target(current);
if (!error) {
static struct itimerspec zero_it;
diff -r df7bc026d50e -r 4ea674e8825e kernel/ptrace.c
--- a/kernel/ptrace.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/ptrace.c Mon Jan 29 15:46:47 2007 -0800
@@ -221,7 +221,7 @@ static inline void __ptrace_detach(struc
__ptrace_unlink(child);
/* .. and wake it up. */
if (child->exit_state != EXIT_ZOMBIE)
- wake_up_process(child);
+ wake_up_task(child);
}
int ptrace_detach(struct task_struct *child, unsigned int data)
diff -r df7bc026d50e -r 4ea674e8825e kernel/rtmutex.c
--- a/kernel/rtmutex.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/rtmutex.c Mon Jan 29 15:46:47 2007 -0800
@@ -516,7 +516,8 @@ static void wakeup_next_waiter(struct rt
}
spin_unlock_irqrestore(&pendowner->pi_lock, flags);
- wake_up_process(pendowner);
+#warning "this looks like it needs expert attention"
+ wake_up_task(pendowner);
}
/*
@@ -640,7 +641,7 @@ rt_mutex_slowlock(struct rt_mutex *lock,
/* Signal pending? */
if (signal_pending(current))
ret = -EINTR;
- if (timeout && !timeout->task)
+ if (timeout && !timeout->wake_target)
ret = -ETIMEDOUT;
if (ret)
break;
diff -r df7bc026d50e -r 4ea674e8825e kernel/sched.c
--- a/kernel/sched.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/sched.c Mon Jan 29 15:46:47 2007 -0800
@@ -1381,10 +1381,52 @@ static inline int wake_idle(int cpu, str
}
#endif
+/*
+ * This path wakes a fibril.
+ *
+ * In the common case, a task will be sleeping with multiple pending
+ * sleeping fibrils. In that case we need to put the fibril on the task's
+ * runnable list and wake the task itself. We need it to go back through
+ * the scheduler to find the runnable fibril so we set TIF_NEED_RESCHED.
+ *
+ * A derivative of that case is when the fibril that we're waking is already
+ * current on the sleeping task. In that case we just need to wake the
+ * task itself, it will already be executing the fibril we're waking. We
+ * do not put it on the runnable list in that case.
+ *
+ * XXX Obviously, there are lots of very scary races here. We should get
+ * more confidence that they're taken care of.
+ */
+static int try_to_wake_up_fibril(struct task_struct *tsk, void *wake_target,
+ unsigned int state)
+{
+ struct fibril *fibril = (struct fibril *)
+ ((unsigned long)wake_target & ~1UL);
+ long old_state = fibril->state;
+ int ret = 1;
+
+ if (!(old_state & state))
+ goto out;
+
+ ret = 0;
+ fibril->state = TASK_RUNNING;
+
+ if (fibril->ti->task->fibril != fibril) {
+ BUG_ON(!list_empty(&fibril->run_list));
+ list_add_tail(&fibril->run_list, &tsk->runnable_fibrils);
+ if (!tsk->array)
+ set_ti_thread_flag(task_thread_info(tsk),
+ TIF_NEED_RESCHED);
+ }
+
+out:
+ return ret;
+}
+
/***
* try_to_wake_up - wake up a thread
- * @p: the to-be-woken-up thread
- * @state: the mask of task states that can be woken
+ * @wake_target: the to-be-woken-up sleeper, from task_wake_target()
+ * @state: the mask of states that can be woken
* @sync: do a synchronous wakeup?
*
* Put it on the run-queue if it's not already there. The "current"
@@ -1395,9 +1437,10 @@ static inline int wake_idle(int cpu, str
*
* returns failure only if the task is already active.
*/
-static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
+static int try_to_wake_up(void *wake_target, unsigned int state, int sync)
{
int cpu, this_cpu, success = 0;
+ struct task_struct *p = wake_target_to_task(wake_target);
unsigned long flags;
long old_state;
struct rq *rq;
@@ -1408,6 +1451,12 @@ static int try_to_wake_up(struct task_st
#endif
rq = task_rq_lock(p, &flags);
+
+ /* See if we're just putting a fibril on its task's runnable list */
+ if (unlikely(((unsigned long)wake_target & 1) &&
+ try_to_wake_up_fibril(p, wake_target, state)))
+ goto out;
+
old_state = p->state;
if (!(old_state & state))
goto out;
@@ -1555,16 +1604,27 @@ out:
return success;
}
-int fastcall wake_up_process(struct task_struct *p)
-{
- return try_to_wake_up(p, TASK_STOPPED | TASK_TRACED |
+int fastcall wake_up_task(struct task_struct *task)
+{
+ return try_to_wake_up((void *)task, TASK_STOPPED | TASK_TRACED |
TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE, 0);
}
-EXPORT_SYMBOL(wake_up_process);
-
+EXPORT_SYMBOL(wake_up_task);
+
+int fastcall wake_up_target(void *wake_target)
+{
+ return try_to_wake_up(wake_target, TASK_STOPPED | TASK_TRACED |
+ TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE, 0);
+}
+EXPORT_SYMBOL(wake_up_target);
+
+/*
+ * XXX We need to figure out how signal delivery will wake the fibrils in
+ * a task.
+ */
int fastcall wake_up_state(struct task_struct *p, unsigned int state)
{
- return try_to_wake_up(p, state, 0);
+ return try_to_wake_up((void *)p, state, 0);
}
static void task_running_tick(struct rq *rq, struct task_struct *p);
@@ -2041,7 +2101,7 @@ static void sched_migrate_task(struct ta
get_task_struct(mt);
task_rq_unlock(rq, &flags);
- wake_up_process(mt);
+ wake_up_task(mt);
put_task_struct(mt);
wait_for_completion(&req.done);
@@ -2673,7 +2733,7 @@ redo:
}
spin_unlock_irqrestore(&busiest->lock, flags);
if (active_balance)
- wake_up_process(busiest->migration_thread);
+ wake_up_task(busiest->migration_thread);
/*
* We've kicked active balancing, reset the failure
@@ -3781,6 +3841,33 @@ need_resched:
#endif /* CONFIG_PREEMPT */
+/*
+ * This is a void * so that it's harder for people to stash it in a small
+ * scalar without getting warnings.
+ */
+void *task_wake_target(struct task_struct *task)
+{
+ if (task->fibril) {
+ return (void *)((unsigned long)task->fibril | 1);
+ } else {
+ BUG_ON((unsigned long)task & 1);
+ return task;
+ }
+}
+EXPORT_SYMBOL(task_wake_target);
+
+struct task_struct *wake_target_to_task(void *wake_target)
+{
+ if ((unsigned long)wake_target & 1) {
+ struct fibril *fibril;
+ fibril = (struct fibril *) ((unsigned long)wake_target ^ 1);
+ return fibril->ti->task;
+ } else
+ return (struct task_struct *)((unsigned long)wake_target);
+}
+EXPORT_SYMBOL(wake_target_to_task);
+
+
int default_wake_function(wait_queue_t *curr, unsigned mode, int sync,
void *key)
{
@@ -5140,7 +5227,7 @@ int set_cpus_allowed(struct task_struct
if (migrate_task(p, any_online_cpu(new_mask), &req)) {
/* Need help from migration thread: drop lock and wait. */
task_rq_unlock(rq, &flags);
- wake_up_process(rq->migration_thread);
+ wake_up_task(rq->migration_thread);
wait_for_completion(&req.done);
tlb_migrate_finish(p->mm);
return 0;
@@ -5462,7 +5549,7 @@ migration_call(struct notifier_block *nf
case CPU_ONLINE:
/* Strictly unneccessary, as first user will wake it. */
- wake_up_process(cpu_rq(cpu)->migration_thread);
+ wake_up_task(cpu_rq(cpu)->migration_thread);
break;
#ifdef CONFIG_HOTPLUG_CPU
diff -r df7bc026d50e -r 4ea674e8825e kernel/signal.c
--- a/kernel/signal.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/signal.c Mon Jan 29 15:46:47 2007 -0800
@@ -948,7 +948,7 @@ __group_complete_signal(int sig, struct
signal_wake_up(t, 0);
t = next_thread(t);
} while (t != p);
- wake_up_process(p->signal->group_exit_task);
+ wake_up_task(p->signal->group_exit_task);
return;
}
diff -r df7bc026d50e -r 4ea674e8825e kernel/softirq.c
--- a/kernel/softirq.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/softirq.c Mon Jan 29 15:46:47 2007 -0800
@@ -58,7 +58,7 @@ static inline void wakeup_softirqd(void)
struct task_struct *tsk = __get_cpu_var(ksoftirqd);
if (tsk && tsk->state != TASK_RUNNING)
- wake_up_process(tsk);
+ wake_up_task(tsk);
}
/*
@@ -583,7 +583,7 @@ static int __cpuinit cpu_callback(struct
per_cpu(ksoftirqd, hotcpu) = p;
break;
case CPU_ONLINE:
- wake_up_process(per_cpu(ksoftirqd, hotcpu));
+ wake_up_task(per_cpu(ksoftirqd, hotcpu));
break;
#ifdef CONFIG_HOTPLUG_CPU
case CPU_UP_CANCELED:
diff -r df7bc026d50e -r 4ea674e8825e kernel/stop_machine.c
--- a/kernel/stop_machine.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/stop_machine.c Mon Jan 29 15:46:47 2007 -0800
@@ -185,7 +185,7 @@ struct task_struct *__stop_machine_run(i
p = kthread_create(do_stop, &smdata, "kstopmachine");
if (!IS_ERR(p)) {
kthread_bind(p, cpu);
- wake_up_process(p);
+ wake_up_task(p);
wait_for_completion(&smdata.done);
}
up(&stopmachine_mutex);
diff -r df7bc026d50e -r 4ea674e8825e kernel/timer.c
--- a/kernel/timer.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/timer.c Mon Jan 29 15:46:47 2007 -0800
@@ -1290,7 +1290,7 @@ asmlinkage long sys_getegid(void)
static void process_timeout(unsigned long __data)
{
- wake_up_process((struct task_struct *)__data);
+ wake_up_task((struct task_struct *)__data);
}
/**
diff -r df7bc026d50e -r 4ea674e8825e kernel/workqueue.c
--- a/kernel/workqueue.c Mon Jan 29 15:36:16 2007 -0800
+++ b/kernel/workqueue.c Mon Jan 29 15:46:47 2007 -0800
@@ -504,14 +504,14 @@ struct workqueue_struct *__create_workqu
if (!p)
destroy = 1;
else
- wake_up_process(p);
+ wake_up_task(p);
} else {
list_add(&wq->list, &workqueues);
for_each_online_cpu(cpu) {
p = create_workqueue_thread(wq, cpu, freezeable);
if (p) {
kthread_bind(p, cpu);
- wake_up_process(p);
+ wake_up_task(p);
} else
destroy = 1;
}
@@ -773,7 +773,7 @@ static int __devinit workqueue_cpu_callb
cwq = per_cpu_ptr(wq->cpu_wq, hotcpu);
kthread_bind(cwq->thread, hotcpu);
- wake_up_process(cwq->thread);
+ wake_up_task(cwq->thread);
}
mutex_unlock(&workqueue_mutex);
break;
diff -r df7bc026d50e -r 4ea674e8825e lib/rwsem.c
--- a/lib/rwsem.c Mon Jan 29 15:36:16 2007 -0800
+++ b/lib/rwsem.c Mon Jan 29 15:46:47 2007 -0800
@@ -30,7 +30,7 @@ EXPORT_SYMBOL(__init_rwsem);
struct rwsem_waiter {
struct list_head list;
- struct task_struct *task;
+ void *wake_target;
unsigned int flags;
#define RWSEM_WAITING_FOR_READ 0x00000001
#define RWSEM_WAITING_FOR_WRITE 0x00000002
@@ -50,7 +50,7 @@ __rwsem_do_wake(struct rw_semaphore *sem
__rwsem_do_wake(struct rw_semaphore *sem, int downgrading)
{
struct rwsem_waiter *waiter;
- struct task_struct *tsk;
+ void *wake_target;
struct list_head *next;
signed long oldcount, woken, loop;
@@ -75,16 +75,17 @@ __rwsem_do_wake(struct rw_semaphore *sem
if (!(waiter->flags & RWSEM_WAITING_FOR_WRITE))
goto readers_only;
- /* We must be careful not to touch 'waiter' after we set ->task = NULL.
- * It is an allocated on the waiter's stack and may become invalid at
- * any time after that point (due to a wakeup from another source).
+ /* We must be careful not to touch 'waiter' after we set ->wake_target
+ * = NULL. It is an allocated on the waiter's stack and may become
+ * invalid at any time after that point (due to a wakeup from another
+ * source).
*/
list_del(&waiter->list);
- tsk = waiter->task;
+ wake_target = waiter->wake_target;
smp_mb();
- waiter->task = NULL;
- wake_up_process(tsk);
- put_task_struct(tsk);
+ waiter->wake_target = NULL;
+ wake_up_target(wake_target);
+ put_task_struct(wake_target_to_task(wake_target));
goto out;
/* don't want to wake any writers */
@@ -123,11 +124,11 @@ __rwsem_do_wake(struct rw_semaphore *sem
for (; loop > 0; loop--) {
waiter = list_entry(next, struct rwsem_waiter, list);
next = waiter->list.next;
- tsk = waiter->task;
+ wake_target = waiter->wake_target;
smp_mb();
- waiter->task = NULL;
- wake_up_process(tsk);
- put_task_struct(tsk);
+ waiter->wake_target = NULL;
+ wake_up_target(wake_target);
+ put_task_struct(wake_target_to_task(wake_target));
}
sem->wait_list.next = next;
@@ -157,7 +158,7 @@ rwsem_down_failed_common(struct rw_semap
/* set up my own style of waitqueue */
spin_lock_irq(&sem->wait_lock);
- waiter->task = tsk;
+ waiter->wake_target = task_wake_target(tsk);
get_task_struct(tsk);
list_add_tail(&waiter->list, &sem->wait_list);
@@ -173,7 +174,7 @@ rwsem_down_failed_common(struct rw_semap
/* wait to be given the lock */
for (;;) {
- if (!waiter->task)
+ if (!waiter->wake_target)
break;
schedule();
set_task_state(tsk, TASK_UNINTERRUPTIBLE);
diff -r df7bc026d50e -r 4ea674e8825e mm/pdflush.c
--- a/mm/pdflush.c Mon Jan 29 15:36:16 2007 -0800
+++ b/mm/pdflush.c Mon Jan 29 15:46:47 2007 -0800
@@ -217,7 +217,7 @@ int pdflush_operation(void (*fn)(unsigne
last_empty_jifs = jiffies;
pdf->fn = fn;
pdf->arg0 = arg0;
- wake_up_process(pdf->who);
+ wake_up_task(pdf->who);
spin_unlock_irqrestore(&pdflush_lock, flags);
}
return ret;
diff -r df7bc026d50e -r 4ea674e8825e net/core/pktgen.c
--- a/net/core/pktgen.c Mon Jan 29 15:36:16 2007 -0800
+++ b/net/core/pktgen.c Mon Jan 29 15:46:47 2007 -0800
@@ -3505,7 +3505,7 @@ static int __init pktgen_create_thread(i
pe->proc_fops = &pktgen_thread_fops;
pe->data = t;
- wake_up_process(p);
+ wake_up_task(p);
return 0;
}
-
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