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Subject[PATCH] Initial prototype version of sched_wait_block
Date

Signed-off-by: Stijn Devriendt <HIGHGuY@gmail.com>
---
arch/alpha/include/asm/unistd.h | 3 +-
arch/arm/include/asm/unistd.h | 1 +
arch/avr32/include/asm/unistd.h | 3 +-
arch/blackfin/include/asm/unistd.h | 3 +-
arch/cris/include/asm/unistd.h | 3 +-
arch/frv/include/asm/unistd.h | 3 +-
arch/h8300/include/asm/unistd.h | 3 +-
arch/ia64/include/asm/unistd.h | 3 +-
arch/m32r/include/asm/unistd.h | 3 +-
arch/m68k/include/asm/unistd.h | 3 +-
arch/microblaze/include/asm/unistd.h | 3 +-
arch/mips/include/asm/unistd.h | 4 +-
arch/mn10300/include/asm/unistd.h | 3 +-
arch/parisc/include/asm/unistd.h | 3 +-
arch/powerpc/include/asm/unistd.h | 3 +-
arch/s390/include/asm/unistd.h | 4 ++-
arch/sh/include/asm/unistd_32.h | 3 +-
arch/sh/include/asm/unistd_64.h | 3 +-
arch/sparc/include/asm/unistd.h | 3 +-
arch/x86/ia32/ia32entry.S | 1 +
arch/x86/include/asm/unistd_32.h | 1 +
arch/x86/include/asm/unistd_64.h | 2 +
arch/x86/kernel/syscall_table_32.S | 1 +
arch/xtensa/include/asm/unistd.h | 3 +-
include/asm-generic/unistd.h | 5 ++-
include/linux/init_task.h | 1 +
include/linux/sched.h | 3 +-
include/linux/syscalls.h | 1 +
include/linux/wait.h | 1 +
kernel/fork.c | 2 +
kernel/sched.c | 64 ++++++++++++++++++++++++++++++++--
31 files changed, 117 insertions(+), 25 deletions(-)
diff --git a/arch/alpha/include/asm/unistd.h b/arch/alpha/include/asm/unistd.h
index 5b5c174..3b1b200 100644
--- a/arch/alpha/include/asm/unistd.h
+++ b/arch/alpha/include/asm/unistd.h
@@ -433,10 +433,11 @@
#define __NR_signalfd 476
#define __NR_timerfd 477
#define __NR_eventfd 478
+#define __NR_sched_wait_block 479

#ifdef __KERNEL__

-#define NR_SYSCALLS 479
+#define NR_SYSCALLS 480

#define __ARCH_WANT_IPC_PARSE_VERSION
#define __ARCH_WANT_OLD_READDIR
diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h
index 4e506d0..76364ce 100644
--- a/arch/arm/include/asm/unistd.h
+++ b/arch/arm/include/asm/unistd.h
@@ -391,6 +391,7 @@
#define __NR_pwritev (__NR_SYSCALL_BASE+362)
#define __NR_rt_tgsigqueueinfo (__NR_SYSCALL_BASE+363)
#define __NR_perf_event_open (__NR_SYSCALL_BASE+364)
+#define __NR_sched_wait_block (__NR_SYSCALL_BASE+365)

/*
* The following SWIs are ARM private.
diff --git a/arch/avr32/include/asm/unistd.h b/arch/avr32/include/asm/unistd.h
index 89861a2..eb892f6 100644
--- a/arch/avr32/include/asm/unistd.h
+++ b/arch/avr32/include/asm/unistd.h
@@ -299,9 +299,10 @@
#define __NR_signalfd 279
/* 280 was __NR_timerfd */
#define __NR_eventfd 281
+#define __NR_sched_wait_block 282

#ifdef __KERNEL__
-#define NR_syscalls 282
+#define NR_syscalls 283

/* Old stuff */
#define __IGNORE_uselib
diff --git a/arch/blackfin/include/asm/unistd.h b/arch/blackfin/include/asm/unistd.h
index 779be02..8535d69 100644
--- a/arch/blackfin/include/asm/unistd.h
+++ b/arch/blackfin/include/asm/unistd.h
@@ -388,8 +388,9 @@
#define __NR_pwritev 367
#define __NR_rt_tgsigqueueinfo 368
#define __NR_perf_event_open 369
+#define __NR_sched_wait_block 370

-#define __NR_syscall 370
+#define __NR_syscall 371
#define NR_syscalls __NR_syscall

/* Old optional stuff no one actually uses */
diff --git a/arch/cris/include/asm/unistd.h b/arch/cris/include/asm/unistd.h
index c170793..8360734 100644
--- a/arch/cris/include/asm/unistd.h
+++ b/arch/cris/include/asm/unistd.h
@@ -339,10 +339,11 @@
#define __NR_inotify_init1 332
#define __NR_preadv 333
#define __NR_pwritev 334
+#define __NR_sched_wait_block 335

#ifdef __KERNEL__

-#define NR_syscalls 335
+#define NR_syscalls 336

#include <arch/unistd.h>

diff --git a/arch/frv/include/asm/unistd.h b/arch/frv/include/asm/unistd.h
index be6ef0f..4c90687 100644
--- a/arch/frv/include/asm/unistd.h
+++ b/arch/frv/include/asm/unistd.h
@@ -343,10 +343,11 @@
#define __NR_pwritev 334
#define __NR_rt_tgsigqueueinfo 335
#define __NR_perf_event_open 336
+#define __NR_sched_wait_block 337

#ifdef __KERNEL__

-#define NR_syscalls 337
+#define NR_syscalls 338

#define __ARCH_WANT_IPC_PARSE_VERSION
/* #define __ARCH_WANT_OLD_READDIR */
diff --git a/arch/h8300/include/asm/unistd.h b/arch/h8300/include/asm/unistd.h
index 99f3c35..eb73a9c 100644
--- a/arch/h8300/include/asm/unistd.h
+++ b/arch/h8300/include/asm/unistd.h
@@ -325,10 +325,11 @@
#define __NR_move_pages 317
#define __NR_getcpu 318
#define __NR_epoll_pwait 319
+#define __NR_sched_wait_block 320

#ifdef __KERNEL__

-#define NR_syscalls 320
+#define NR_syscalls 321

#define __ARCH_WANT_IPC_PARSE_VERSION
#define __ARCH_WANT_OLD_READDIR
diff --git a/arch/ia64/include/asm/unistd.h b/arch/ia64/include/asm/unistd.h
index 5a5347f..ccb2154 100644
--- a/arch/ia64/include/asm/unistd.h
+++ b/arch/ia64/include/asm/unistd.h
@@ -311,11 +311,12 @@
#define __NR_preadv 1319
#define __NR_pwritev 1320
#define __NR_rt_tgsigqueueinfo 1321
+#define __NR_sched_wait_block 1322

#ifdef __KERNEL__


-#define NR_syscalls 298 /* length of syscall table */
+#define NR_syscalls 299 /* length of syscall table */

/*
* The following defines stop scripts/checksyscalls.sh from complaining about
diff --git a/arch/m32r/include/asm/unistd.h b/arch/m32r/include/asm/unistd.h
index cf701c9..f4a0030 100644
--- a/arch/m32r/include/asm/unistd.h
+++ b/arch/m32r/include/asm/unistd.h
@@ -330,10 +330,11 @@
/* #define __NR_timerfd 322 removed */
#define __NR_eventfd 323
#define __NR_fallocate 324
+#define __NR_sched_wait_block 325

#ifdef __KERNEL__

-#define NR_syscalls 325
+#define NR_syscalls 326

#define __ARCH_WANT_IPC_PARSE_VERSION
#define __ARCH_WANT_STAT64
diff --git a/arch/m68k/include/asm/unistd.h b/arch/m68k/include/asm/unistd.h
index 48b87f5..e792350 100644
--- a/arch/m68k/include/asm/unistd.h
+++ b/arch/m68k/include/asm/unistd.h
@@ -336,10 +336,11 @@
#define __NR_pwritev 330
#define __NR_rt_tgsigqueueinfo 331
#define __NR_perf_event_open 332
+#define __NR_sched_wait_block 333

#ifdef __KERNEL__

-#define NR_syscalls 333
+#define NR_syscalls 334

#define __ARCH_WANT_IPC_PARSE_VERSION
#define __ARCH_WANT_OLD_READDIR
diff --git a/arch/microblaze/include/asm/unistd.h b/arch/microblaze/include/asm/unistd.h
index cb05a07..df787b2 100644
--- a/arch/microblaze/include/asm/unistd.h
+++ b/arch/microblaze/include/asm/unistd.h
@@ -382,8 +382,9 @@
#define __NR_pwritev 364 /* new */
#define __NR_rt_tgsigqueueinfo 365 /* new */
#define __NR_perf_event_open 366 /* new */
+#define __NR_sched_wait_block 367

-#define __NR_syscalls 367
+#define __NR_syscalls 368

#ifdef __KERNEL__
#ifndef __ASSEMBLY__
diff --git a/arch/mips/include/asm/unistd.h b/arch/mips/include/asm/unistd.h
index 8c9dfa9..ac3086f 100644
--- a/arch/mips/include/asm/unistd.h
+++ b/arch/mips/include/asm/unistd.h
@@ -355,11 +355,11 @@
#define __NR_rt_tgsigqueueinfo (__NR_Linux + 332)
#define __NR_perf_event_open (__NR_Linux + 333)
#define __NR_accept4 (__NR_Linux + 334)
-
+#define __NR_sched_wait_block (__NR_Linux + 335)
/*
* Offset of the last Linux o32 flavoured syscall
*/
-#define __NR_Linux_syscalls 334
+#define __NR_Linux_syscalls 335

#endif /* _MIPS_SIM == _MIPS_SIM_ABI32 */

diff --git a/arch/mn10300/include/asm/unistd.h b/arch/mn10300/include/asm/unistd.h
index 2a98393..3d0ec30 100644
--- a/arch/mn10300/include/asm/unistd.h
+++ b/arch/mn10300/include/asm/unistd.h
@@ -348,10 +348,11 @@
#define __NR_pwritev 335
#define __NR_rt_tgsigqueueinfo 336
#define __NR_perf_event_open 337
+#define __NR_sched_wait_block 338

#ifdef __KERNEL__

-#define NR_syscalls 338
+#define NR_syscalls 339

/*
* specify the deprecated syscalls we want to support on this arch
diff --git a/arch/parisc/include/asm/unistd.h b/arch/parisc/include/asm/unistd.h
index cda1583..383332b 100644
--- a/arch/parisc/include/asm/unistd.h
+++ b/arch/parisc/include/asm/unistd.h
@@ -811,8 +811,9 @@
#define __NR_pwritev (__NR_Linux + 316)
#define __NR_rt_tgsigqueueinfo (__NR_Linux + 317)
#define __NR_perf_event_open (__NR_Linux + 318)
+#define __NR_sched_wait_block (__NR_Linux + 319)

-#define __NR_Linux_syscalls (__NR_perf_event_open + 1)
+#define __NR_Linux_syscalls (__NR_sched_wait_block + 1)


#define __IGNORE_select /* newselect */
diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index f6ca761..466aa45 100644
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -345,10 +345,11 @@
#define __NR_preadv 320
#define __NR_pwritev 321
#define __NR_rt_tgsigqueueinfo 322
+#define __NR_sched_wait_block 323

#ifdef __KERNEL__

-#define __NR_syscalls 323
+#define __NR_syscalls 324

#define __NR__exit __NR_exit
#define NR_syscalls __NR_syscalls
diff --git a/arch/s390/include/asm/unistd.h b/arch/s390/include/asm/unistd.h
index cb5232d..c0dabc5 100644
--- a/arch/s390/include/asm/unistd.h
+++ b/arch/s390/include/asm/unistd.h
@@ -269,7 +269,9 @@
#define __NR_pwritev 329
#define __NR_rt_tgsigqueueinfo 330
#define __NR_perf_event_open 331
-#define NR_syscalls 332
+#define __NR_sched_wait_block 332
+
+#define NR_syscalls 333

/*
* There are some system calls that are not present on 64 bit, some
diff --git a/arch/sh/include/asm/unistd_32.h b/arch/sh/include/asm/unistd_32.h
index f3fd1b9..16516d3 100644
--- a/arch/sh/include/asm/unistd_32.h
+++ b/arch/sh/include/asm/unistd_32.h
@@ -345,8 +345,9 @@
#define __NR_pwritev 334
#define __NR_rt_tgsigqueueinfo 335
#define __NR_perf_event_open 336
+#define __NR_sched_wait_block 337

-#define NR_syscalls 337
+#define NR_syscalls 338

#ifdef __KERNEL__

diff --git a/arch/sh/include/asm/unistd_64.h b/arch/sh/include/asm/unistd_64.h
index 343ce8f..6bf4ab4 100644
--- a/arch/sh/include/asm/unistd_64.h
+++ b/arch/sh/include/asm/unistd_64.h
@@ -385,10 +385,11 @@
#define __NR_pwritev 362
#define __NR_rt_tgsigqueueinfo 363
#define __NR_perf_event_open 364
+#define __NR_sched_wait_block 365

#ifdef __KERNEL__

-#define NR_syscalls 365
+#define NR_syscalls 366

#define __ARCH_WANT_IPC_PARSE_VERSION
#define __ARCH_WANT_OLD_READDIR
diff --git a/arch/sparc/include/asm/unistd.h b/arch/sparc/include/asm/unistd.h
index 42f2316..482664d 100644
--- a/arch/sparc/include/asm/unistd.h
+++ b/arch/sparc/include/asm/unistd.h
@@ -396,8 +396,9 @@
#define __NR_pwritev 325
#define __NR_rt_tgsigqueueinfo 326
#define __NR_perf_event_open 327
+#define __NR_sched_wait_block 328

-#define NR_SYSCALLS 328
+#define NR_SYSCALLS 329

#ifdef __32bit_syscall_numbers__
/* Sparc 32-bit only has the "setresuid32", "getresuid32" variants,
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 581b056..a63001a 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -841,4 +841,5 @@ ia32_sys_call_table:
.quad compat_sys_pwritev
.quad compat_sys_rt_tgsigqueueinfo /* 335 */
.quad sys_perf_event_open
+ .quad sys_sched_wait_block
ia32_syscall_end:
diff --git a/arch/x86/include/asm/unistd_32.h b/arch/x86/include/asm/unistd_32.h
index 6fb3c20..91a9e56 100644
--- a/arch/x86/include/asm/unistd_32.h
+++ b/arch/x86/include/asm/unistd_32.h
@@ -342,6 +342,7 @@
#define __NR_pwritev 334
#define __NR_rt_tgsigqueueinfo 335
#define __NR_perf_event_open 336
+#define __NR_sched_wait_block 337

#ifdef __KERNEL__

diff --git a/arch/x86/include/asm/unistd_64.h b/arch/x86/include/asm/unistd_64.h
index 8d3ad0a..11e943e 100644
--- a/arch/x86/include/asm/unistd_64.h
+++ b/arch/x86/include/asm/unistd_64.h
@@ -661,6 +661,8 @@ __SYSCALL(__NR_pwritev, sys_pwritev)
__SYSCALL(__NR_rt_tgsigqueueinfo, sys_rt_tgsigqueueinfo)
#define __NR_perf_event_open 298
__SYSCALL(__NR_perf_event_open, sys_perf_event_open)
+#define __NR_sched_wait_block 299
+__SYSCALL(__NR_sched_wait_block, sys_sched_wait_block)

#ifndef __NO_STUBS
#define __ARCH_WANT_OLD_READDIR
diff --git a/arch/x86/kernel/syscall_table_32.S b/arch/x86/kernel/syscall_table_32.S
index 0157cd2..2f93cef 100644
--- a/arch/x86/kernel/syscall_table_32.S
+++ b/arch/x86/kernel/syscall_table_32.S
@@ -336,3 +336,4 @@ ENTRY(sys_call_table)
.long sys_pwritev
.long sys_rt_tgsigqueueinfo /* 335 */
.long sys_perf_event_open
+ .long sys_sched_wait_block
diff --git a/arch/xtensa/include/asm/unistd.h b/arch/xtensa/include/asm/unistd.h
index c092c8f..834aa00 100644
--- a/arch/xtensa/include/asm/unistd.h
+++ b/arch/xtensa/include/asm/unistd.h
@@ -681,8 +681,9 @@ __SYSCALL(304, sys_signalfd, 3)
__SYSCALL(305, sys_ni_syscall, 0)
#define __NR_eventfd 306
__SYSCALL(306, sys_eventfd, 1)
+#define __NR_sched_wait_block 307

-#define __NR_syscall_count 307
+#define __NR_syscall_count 308

/*
* sysxtensa syscall handler
diff --git a/include/asm-generic/unistd.h b/include/asm-generic/unistd.h
index d76b66a..ff21a1b 100644
--- a/include/asm-generic/unistd.h
+++ b/include/asm-generic/unistd.h
@@ -623,8 +623,11 @@ __SYSCALL(__NR_rt_tgsigqueueinfo, sys_rt_tgsigqueueinfo)
#define __NR_perf_event_open 241
__SYSCALL(__NR_perf_event_open, sys_perf_event_open)

+#define __NR_sched_wait_block 242
+__SYSCALL(__NR_sched_wait_block, sys_sched_wait_block)
+
#undef __NR_syscalls
-#define __NR_syscalls 242
+#define __NR_syscalls 243

/*
* All syscalls below here should go away really,
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 21a6f5d..21ed548 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -145,6 +145,7 @@ extern struct cred init_cred;
.pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO), \
.ptraced = LIST_HEAD_INIT(tsk.ptraced), \
.ptrace_entry = LIST_HEAD_INIT(tsk.ptrace_entry), \
+ .task_waiters = __WAIT_QUEUE_HEAD_INITIALIZER(tsk.task_waiters), \
.real_parent = &tsk, \
.parent = &tsk, \
.children = LIST_HEAD_INIT(tsk.children), \
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1c46023..d4639b4 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1280,7 +1280,7 @@ struct task_struct {
unsigned in_execve:1; /* Tell the LSMs that the process is doing an
* execve */
unsigned in_iowait:1;
-
+ unsigned in_taskwait:1;

/* Revert to default priority/policy when forking */
unsigned sched_reset_on_fork:1;
@@ -1315,6 +1315,7 @@ struct task_struct {
struct list_head ptraced;
struct list_head ptrace_entry;

+ wait_queue_head_t task_waiters;
/*
* This is the tracer handle for the ptrace BTS extension.
* This field actually belongs to the ptracer task.
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index b50974a..e18d7e8 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -406,6 +406,7 @@ asmlinkage long sys_sched_rr_get_interval(pid_t pid,
struct timespec __user *interval);
asmlinkage long sys_setpriority(int which, int who, int niceval);
asmlinkage long sys_getpriority(int which, int who);
+asmlinkage long sys_sched_wait_block(pid_t pid, struct timespec __user *uts);

asmlinkage long sys_shutdown(int, int);
asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd,
diff --git a/include/linux/wait.h b/include/linux/wait.h
index a48e16b..4afb340 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -157,6 +157,7 @@ wait_queue_head_t *bit_waitqueue(void *, int);
#define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL)
#define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL)
#define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL)
+#define wake_up_sync_all(x) __wake_up_sync((x), TASK_NORMAL, 0)

#define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL)
#define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL)
diff --git a/kernel/fork.c b/kernel/fork.c
index 166b8c4..e664442 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1121,6 +1121,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->blocked_on = NULL; /* not blocked yet */
#endif

+ init_waitqueue_head(&p->task_waiters);
+
p->bts = NULL;

p->stack_start = stack_start;
diff --git a/kernel/sched.c b/kernel/sched.c
index 7179c80..98f5480 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5440,6 +5440,7 @@ asmlinkage void __sched schedule(void)
struct rq *rq;
int cpu;

+
need_resched:
preempt_disable();
cpu = smp_processor_id();
@@ -5450,6 +5451,8 @@ need_resched:

release_kernel_lock(prev);
need_resched_nonpreemptible:
+ if (prev->state && !unlikely(prev->in_taskwait) && unlikely(waitqueue_active(&prev->task_waiters)))
+ wake_up_sync_all(&prev->task_waiters);

schedule_debug(prev);

@@ -5467,7 +5470,7 @@ need_resched_nonpreemptible:
deactivate_task(rq, prev, 1);
switch_count = &prev->nvcsw;
}
-
+
pre_schedule(rq, prev);

if (unlikely(!rq->nr_running))
@@ -5717,8 +5720,8 @@ void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode,
if (unlikely(!q))
return;

- if (unlikely(!nr_exclusive))
- wake_flags = 0;
+ /*if (unlikely(!nr_exclusive))
+ wake_flags = 0;*/

spin_lock_irqsave(&q->lock, flags);
__wake_up_common(q, mode, nr_exclusive, wake_flags, key);
@@ -6889,6 +6892,61 @@ out_unlock:
return retval;
}

+SYSCALL_DEFINE2(sched_wait_block, pid_t, pid, struct timespec __user *, uts)
+{
+ struct task_struct* p;
+ long retval;
+ struct timespec ts;
+ long timeout = MAX_SCHEDULE_TIMEOUT;
+
+ if (pid < 0)
+ {
+ printk(KERN_INFO "Unknown PID: %d\n", pid);
+ return -EINVAL;
+ }
+
+ if (uts)
+ {
+ if (copy_from_user(&ts, uts, sizeof(struct timespec)))
+ return -EINVAL;
+
+ timeout = timespec_to_jiffies(&ts);
+ printk(KERN_INFO "Timeout: %d\n", timeout);
+
+ if (timeout < 0)
+ return -EINVAL;
+ }
+
+ read_lock(&tasklist_lock);
+ p = find_process_by_pid(pid);
+ if (!p)
+ {
+ read_unlock(&tasklist_lock);
+ return -ESRCH;
+ }
+ get_task_struct(p);
+ read_unlock(&tasklist_lock);
+
+ printk(KERN_INFO "Waiting...");
+ // logic
+ current->in_taskwait = 1;
+ retval = wait_event_interruptible_timeout(p->task_waiters, p->state, timeout);
+ current->in_taskwait = 0;
+ // endlogic
+ printk("Done: %d\n", retval);
+
+ if (retval == -ERESTARTSYS)
+ retval = -EINTR;
+ else if (p->state)
+ retval = 0;
+ else
+ retval = -EAGAIN;
+
+ put_task_struct(p);
+
+ return retval;
+}
+
static const char stat_nam[] = TASK_STATE_TO_CHAR_STR;

void sched_show_task(struct task_struct *p)
--
1.6.3.3


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