linux-kernel - [patch 03/14] syslets: generic kernel bits

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Date:	Thu, 15 Feb 2007 17:52:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [patch 03/14] syslets: generic kernel bits

From: Ingo Molnar <mingo@...e.hu>

add the kernel generic bits - these are present even if !CONFIG_ASYNC_SUPPORT.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
---
 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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