>From Michal Kaczmarski <[email protected]>
I think selection of a default IO scheduler via Kconfig
can be a nice addition to the kernel.
---
Kconfig.iosched | 17 +++++++++++++++++
elevator.c | 35 ++++++++++++++++++++++++++---------
2 files changed, 43 insertions(+), 9 deletions(-)
diff -Naur a/drivers/block/Kconfig.iosched b/drivers/block/Kconfig.iosched
--- a/drivers/block/Kconfig.iosched 2005-08-29 01:41:01.000000000 +0200
+++ b/drivers/block/Kconfig.iosched 2005-09-21 19:09:56.000000000 +0200
@@ -38,4 +38,21 @@
among all processes in the system. It should provide a fair
working environment, suitable for desktop systems.
+choice
+ prompt "Default IO scheduler"
+ default IOSCHED_DEFAULT_AS
+ ---help---
+ This option gives you possibility of choice the default IO
+ scheduler from selected to compile IO schedulers.
+
+config IOSCHED_DEFAULT_AS
+ bool "Anticipatory IO scheduler" if IOSCHED_AS
+config IOSCHED_DEFAULT_DEADLINE
+ bool "Deadline IO scheduler" if IOSCHED_DEADLINE
+config IOSCHED_DEFAULT_CFQ
+ bool "CFQ IO scheduler" if IOSCHED_CFQ
+config IOSCHED_DEFAULT_NOOP
+ bool "NOOP IO scheduler" if IOSCHED_NOOP
+endchoice
+
endmenu
diff -Naur a/drivers/block/elevator.c b/drivers/block/elevator.c
--- a/drivers/block/elevator.c 2005-08-29 01:41:01.000000000 +0200
+++ b/drivers/block/elevator.c 2005-09-21 19:33:10.000000000 +0200
@@ -24,6 +24,7 @@
* - completely modularize elevator setup and teardown
*
*/
+#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
@@ -153,21 +154,37 @@
static void elevator_setup_default(void)
{
- /*
- * check if default is set and exists
- */
- if (chosen_elevator[0] && elevator_find(chosen_elevator))
- return;
#if defined(CONFIG_IOSCHED_AS)
+ #if defined(CONFIG_IOSCHED_DEFAULT_AS)
strcpy(chosen_elevator, "anticipatory");
-#elif defined(CONFIG_IOSCHED_DEADLINE)
+ #endif
+#endif
+#if defined(CONFIG_IOSCHED_DEADLINE)
+ #if defined(CONFIG_IOSCHED_DEFAULT_DEADLINE)
strcpy(chosen_elevator, "deadline");
-#elif defined(CONFIG_IOSCHED_CFQ)
+ #endif
+#endif
+#if defined(CONFIG_IOSCHED_CFQ)
+ #if defined(CONFIG_IOSCHED_DEFAULT_CFQ)
strcpy(chosen_elevator, "cfq");
-#elif defined(CONFIG_IOSCHED_NOOP)
+ #endif
+#endif
+#if defined(CONFIG_IOSCHED_NOOP)
+ #if defined(CONFIG_IOSCHED_DEFAULT_NOOP)
strcpy(chosen_elevator, "noop");
-#else
+ #endif
+#endif
+
+ /*
+ * check if default is set and exists
+ */
+ if (chosen_elevator[0] && elevator_find(chosen_elevator))
+ return;
+ else strcpy(chosen_elevator, "noop");
+
+
+#if !defined(CONFIG_IOSCHED_AS) && !defined(CONFIG_IOSCHED_DEADLINE) && !defined(CONFIG_IOSCHED_CFQ) && !defined(CONFIG_IOSCHED_NOOP)
#error "You must build at least 1 IO scheduler into the kernel"
#endif
}
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