> Wanghong Yuan wrote:
> It seems that tq_scheduler disappears in Linux 2.4. SO what can
> I do if I need to do something when the scheduler wakes up.
I also needed the tq_scheduler "feature". I've used the following
patch with success on 2.4.18 (UP) + preempt. However, since this is
strictly a local hack I felt free to change the semantics somewhat.
If this patch is applied to 2.4.18, the tq_scheduler hook returns
-- but the runqueue is serviced *after* the context switch, just
before execution in user space is resumed. The old 2.2.x
tq_scheduler ran just *before* the context switch.
YMMV.
>>>>>
--- linux-2.4.18/include/linux/tqueue.h.old Tue Apr 30 19:03:59 2002
+++ linux-2.4.18/include/linux/tqueue.h Tue Apr 30 19:04:12 2002
@@ -66,7 +66,7 @@
#define DECLARE_TASK_QUEUE(q) LIST_HEAD(q)
#define TQ_ACTIVE(q) (!list_empty(&q))
-extern task_queue tq_timer, tq_immediate, tq_disk;
+extern task_queue tq_timer, tq_immediate, tq_scheduler, tq_disk;
/*
* To implement your own list of active bottom halfs, use the following
--- linux-2.4.18/kernel/sched.c.old Tue Apr 30 19:06:30 2002
+++ linux-2.4.18/kernel/sched.c Tue Apr 30 19:06:00 2002
@@ -106,6 +106,8 @@
char __pad [SMP_CACHE_BYTES];
} aligned_data [NR_CPUS] __cacheline_aligned = { {{&init_task,0}}};
+DECLARE_TASK_QUEUE(tq_scheduler);
+
#define cpu_curr(cpu) aligned_data[(cpu)].schedule_data.curr
#define last_schedule(cpu) aligned_data[(cpu)].schedule_data.last_schedule
@@ -496,6 +498,7 @@
out_unlock:
task_unlock(prev); /* Synchronise here with release_task() if
prev is TASK_ZOMBIE */
+ run_task_queue(&tq_scheduler);
return;
/*
@@ -528,6 +531,7 @@
}
#else
prev->policy &= ~SCHED_YIELD;
+ run_task_queue(&tq_scheduler);
#endif /* CONFIG_SMP */
}
--- linux-2.4.18/kernel/ksyms.c.old Tue Apr 30 19:06:40 2002
+++ linux-2.4.18/kernel/ksyms.c Tue Apr 30 19:04:46 2002
@@ -442,6 +442,7 @@
EXPORT_SYMBOL(xtime);
EXPORT_SYMBOL(do_gettimeofday);
EXPORT_SYMBOL(do_settimeofday);
+EXPORT_SYMBOL(tq_scheduler);
#if !defined(__ia64__)
EXPORT_SYMBOL(loops_per_jiffy);
<<<<<
Andrew Purtell andrew_purtell@nai.com
NAI Labs at Network Associates, Inc. Seattle, WA
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