Re: -mmX 4G patches feedback [numbers: how much performance impact]

[Andrea Arcangeli]

On Wed, Apr 07, 2004 at 08:46:29AM +0200, Ingo Molnar wrote:
> 4:4 patch) but a __flush_tlb() added before and after do_IRQ(), in

I added __flush_tlb_global on entry to better simulate the effect of
4:4. I doubt it makes a difference though.

--- x/arch/i386/kernel/irq.c.~1~	2004-03-11 08:27:22.000000000 +0100
+++ x/arch/i386/kernel/irq.c	2004-04-07 19:23:21.735733664 +0200
@@ -427,6 +427,7 @@ asmlinkage unsigned int do_IRQ(struct pt
 	struct irqaction * action;
 	unsigned int status;
 
+	__flush_tlb_global();
 	irq_enter();
 
 #ifdef CONFIG_DEBUG_STACKOVERFLOW
@@ -507,6 +508,7 @@ out:
 	spin_unlock(&desc->lock);
 
 	irq_exit();
+	__flush_tlb();
 
 	return 1;
 }
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/