From: Ingo Molnar <[email protected]>
add the kernel generic bits - these are present even if !CONFIG_ASYNC_SUPPORT.
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Arjan van de Ven <[email protected]>
---
include/linux/sched.h | 23 ++++++++++++++++++++++-
kernel/exit.c | 3 +++
kernel/fork.c | 2 ++
kernel/sched.c | 9 +++++++++
4 files changed, 36 insertions(+), 1 deletion(-)
Index: linux/include/linux/sched.h
===================================================================
--- linux.orig/include/linux/sched.h
+++ linux/include/linux/sched.h
@@ -83,12 +83,12 @@ struct sched_param {
#include <linux/timer.h>
#include <linux/hrtimer.h>
#include <linux/task_io_accounting.h>
+#include <linux/async.h>
#include <asm/processor.h>
struct exec_domain;
struct futex_pi_state;
-
/*
* List of flags we want to share for kernel threads,
* if only because they are not used by them anyway.
@@ -997,6 +997,12 @@ struct task_struct {
/* journalling filesystem info */
void *journal_info;
+/* async syscall support: */
+ struct async_thread *at, *async_ready;
+ struct async_head *ah;
+ struct async_thread __at;
+ struct async_head __ah;
+
/* VM state */
struct reclaim_state *reclaim_state;
@@ -1053,6 +1059,21 @@ struct task_struct {
#endif
};
+/*
+ * Is an async syscall being executed currently?
+ */
+#ifdef CONFIG_ASYNC_SUPPORT
+static inline int async_syscall(struct task_struct *t)
+{
+ return t->async_ready != NULL;
+}
+#else /* !CONFIG_ASYNC_SUPPORT */
+static inline int async_syscall(struct task_struct *t)
+{
+ return 0;
+}
+#endif /* !CONFIG_ASYNC_SUPPORT */
+
static inline pid_t process_group(struct task_struct *tsk)
{
return tsk->signal->pgrp;
Index: linux/kernel/exit.c
===================================================================
--- linux.orig/kernel/exit.c
+++ linux/kernel/exit.c
@@ -26,6 +26,7 @@
#include <linux/ptrace.h>
#include <linux/profile.h>
#include <linux/mount.h>
+#include <linux/async.h>
#include <linux/proc_fs.h>
#include <linux/mempolicy.h>
#include <linux/taskstats_kern.h>
@@ -889,6 +890,8 @@ fastcall NORET_TYPE void do_exit(long co
schedule();
}
+ async_exit(tsk);
+
tsk->flags |= PF_EXITING;
if (unlikely(in_atomic()))
Index: linux/kernel/fork.c
===================================================================
--- linux.orig/kernel/fork.c
+++ linux/kernel/fork.c
@@ -22,6 +22,7 @@
#include <linux/personality.h>
#include <linux/mempolicy.h>
#include <linux/sem.h>
+#include <linux/async.h>
#include <linux/file.h>
#include <linux/key.h>
#include <linux/binfmts.h>
@@ -1054,6 +1055,7 @@ static struct task_struct *copy_process(
p->lock_depth = -1; /* -1 = no lock */
do_posix_clock_monotonic_gettime(&p->start_time);
+ async_init(p);
p->security = NULL;
p->io_context = NULL;
p->io_wait = NULL;
Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -38,6 +38,7 @@
#include <linux/vmalloc.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
+#include <linux/async.h>
#include <linux/smp.h>
#include <linux/threads.h>
#include <linux/timer.h>
@@ -3436,6 +3437,14 @@ asmlinkage void __sched schedule(void)
}
profile_hit(SCHED_PROFILING, __builtin_return_address(0));
+ prev = current;
+ if (unlikely(prev->async_ready)) {
+ if (prev->state && !(preempt_count() & PREEMPT_ACTIVE) &&
+ (!(prev->state & TASK_INTERRUPTIBLE) ||
+ !signal_pending(prev)))
+ __async_schedule(prev);
+ }
+
need_resched:
preempt_disable();
prev = current;
-
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