Re: [-mm patch] i386: enable 4k stacks by default

[Grant Coady]

On Wed, 4 Jan 2006 22:00:45 +0100, Adrian Bunk <bunk@xxxxxxxxx> wrote:

>On Thu, Jan 05, 2006 at 07:53:00AM +1100, Grant Coady wrote:
>> On Wed, 4 Jan 2006 15:51:38 +0100, Adrian Bunk <bunk@xxxxxxxxx> wrote:
>>...
>> > 	  If you say Y here the kernel will use a 4Kb stacksize for the
>> > 	  kernel stack attached to each process/thread. This facilitates
>> 
>> Perhaps mention 4k + 4k stacks, the separate irq stacks used with 4k option?  
>
>Feel free to submit a patch.  ;-)

Okay :)


Based on Adrian Bunk's patch, default to 4k +4k stacks and making 
it more obvious that available stack space is not being halved.
Compile tested.

Signed-off-by: Grant Coady <gcoady@xxxxxxxxx>

---
 Kconfig.debug |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

--- linux-2.6.15a/arch/i386/Kconfig.debug	2005-10-28 10:02:08.000000000 +1000
+++ linux-2.6.15b/arch/i386/Kconfig.debug	2006-01-05 09:39:22.000000000 +1100
@@ -53,14 +53,15 @@
 	  of memory corruptions.
 
 config 4KSTACKS
-	bool "Use 4Kb for kernel stacks instead of 8Kb"
-	depends on DEBUG_KERNEL
+	bool "Use 4Kb + 4Kb for kernel stacks instead of 8Kb" if DEBUG_KERNEL
+	default y
 	help
 	  If you say Y here the kernel will use a 4Kb stacksize for the
 	  kernel stack attached to each process/thread. This facilitates
 	  running more threads on a system and also reduces the pressure
 	  on the VM subsystem for higher order allocations. This option
-	  will also use IRQ stacks to compensate for the reduced stackspace.
+	  will also use separate 4Kb IRQ stacks to compensate for the 
+	  reduced stackspace.
 
 config X86_FIND_SMP_CONFIG
 	bool
-
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