On Wed, Mar 09 2005, Roberts-Thomson, James wrote:
> Hi,
>
> I've been trying to investigate an IO performance issue on my machine, as
> part of this I've noticed what is (presumably only a cosmetic) issue with
> the messages displayed at kernel boot-time.
>
> In the "good old days" (i.e. older 2.6.x kernel versions), one of the many
> messages displayed at kernel boot-time was "elevator: using XXX as default
> io scheduler", where XXX was one of the IO schedulers (cfq, anticipatory,
> deadline, etc) depending on kernel .config at compile time.
>
> I noticed in 2.6.11, this message has vanished (although this may have
> happened in an earlier kernel), and I now get some messages "io scheduler
> XXX registered". Unfortunately, the "default" scheduler is no longer
> tagged.
Does this work?
--- 2.6.11/drivers/block/elevator.c 2005-01-22 15:22:55.000000000 +1100
+++ test/drivers/block/elevator.c 2005-01-31 22:38:36.000000000 +1100
@@ -180,6 +180,8 @@
__setup("elevator=", elevator_setup);
+static int default_msg = 0;
+
int elevator_init(request_queue_t *q, char *name)
{
struct elevator_type *e = NULL;
@@ -195,6 +197,12 @@
if (!e)
return -EINVAL;
+ if (!default_msg && !strcmp(e->elevator_name, chosen_elevator)) {
+ printk(KERN_INFO "using %s as default io scheduler\n",
+ chosen_elevator);
+ default_msg = 1;
+ }
+
eq = kmalloc(sizeof(struct elevator_queue), GFP_KERNEL);
if (!eq) {
elevator_put(e->elevator_type);
@@ -513,10 +521,7 @@
list_add_tail(&e->list, &elv_list);
spin_unlock_irq(&elv_list_lock);
- printk(KERN_INFO "io scheduler %s registered", e->elevator_name);
- if (!strcmp(e->elevator_name, chosen_elevator))
- printk(" (default)");
- printk("\n");
+ printk(KERN_INFO "io scheduler %s registered\n", e->elevator_name);
return 0;
}
EXPORT_SYMBOL_GPL(elv_register);
--
Jens Axboe
-
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