From: Ben Gras <ben@minix3.org>
Date: Mon, 1 Aug 2011 13:35:34 +0000 (+0200)
Subject: kernel: invlpg facility
X-Git-Tag: v3.2.0~372
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/addsub.png?a=commitdiff_plain;h=35cc7fbeb839fa582a0f282bd93cc8f18c749958;p=minix.git

kernel: invlpg facility

	. only use for single-page invalidations initially
	. shows tiny but statistically significant performance
	  improvement; will be more helpful in certain VM debug
	  modes
---

diff --git a/kernel/arch/i386/arch_do_vmctl.c b/kernel/arch/i386/arch_do_vmctl.c
index 28461d844..242bf01cd 100644
--- a/kernel/arch/i386/arch_do_vmctl.c
+++ b/kernel/arch/i386/arch_do_vmctl.c
@@ -61,6 +61,12 @@ struct proc *p;
 		reload_cr3();
 		return OK;
 	}
+	case VMCTL_I386_INVLPG:
+	{
+		i386_invlpg(m_ptr->SVMCTL_VALUE);
+		return OK;
+	}
+
   }
 
 
diff --git a/kernel/arch/i386/include/arch_proto.h b/kernel/arch/i386/include/arch_proto.h
index af605c6ed..145a3d79e 100644
--- a/kernel/arch/i386/include/arch_proto.h
+++ b/kernel/arch/i386/include/arch_proto.h
@@ -89,6 +89,7 @@ _PROTOTYPE( void phys_outsb, (u16_t port, phys_bytes buf, size_t count) );
 _PROTOTYPE( void phys_outsw, (u16_t port, phys_bytes buf, size_t count) );
 _PROTOTYPE( u32_t read_cr3, (void) );
 _PROTOTYPE( void reload_cr3, (void) );
+_PROTOTYPE( void i386_invlpg, (phys_bytes linaddr) );
 _PROTOTYPE( void phys_memset, (phys_bytes ph, u32_t c, phys_bytes bytes));
 _PROTOTYPE( void reload_ds, (void)					);
 _PROTOTYPE( void ia32_msr_read, (u32_t reg, u32_t * hi, u32_t * lo)	);
diff --git a/kernel/arch/i386/klib.S b/kernel/arch/i386/klib.S
index 561c7e5ea..5f7bcfbb3 100644
--- a/kernel/arch/i386/klib.S
+++ b/kernel/arch/i386/klib.S
@@ -714,6 +714,18 @@ ENTRY(write_cr3)
 	pop	%ebp
 	ret
 
+/*===========================================================================*/
+/*			      i386_invlpg				     */
+/*===========================================================================*/
+/* PUBLIC void i386_invlpg(unsigned long linaddr); */
+ENTRY(i386_invlpg)
+	push	%ebp
+	mov	%esp, %ebp
+	mov	8(%ebp), %eax
+	invlpg	(%eax)
+	pop	%ebp
+	ret
+
 /*===========================================================================*/
 /*				getcr3val				     */
 /*===========================================================================*/
diff --git a/servers/vm/arch/i386/pagetable.c b/servers/vm/arch/i386/pagetable.c
index bbd2183e9..6bb893b34 100644
--- a/servers/vm/arch/i386/pagetable.c
+++ b/servers/vm/arch/i386/pagetable.c
@@ -333,8 +333,8 @@ PUBLIC void *vm_allocpage(phys_bytes *phys, int reason)
 		return NULL;
 	}
 
-	if((r=sys_vmctl(SELF, VMCTL_FLUSHTLB, 0)) != OK) {
-		panic("VMCTL_FLUSHTLB failed: %d", r);
+	if((r=sys_vmctl(SELF, VMCTL_I386_INVLPG, loc)) != OK) {
+		panic("VMCTL_I386_INVLPG failed: %d", r);
 	}
 
 	level--;
@@ -370,8 +370,8 @@ PUBLIC void vm_pagelock(void *vir, int lockflag)
 		panic("vm_lockpage: pt_writemap failed");
 	}
 
-	if((r=sys_vmctl(SELF, VMCTL_FLUSHTLB, 0)) != OK) {
-		panic("VMCTL_FLUSHTLB failed: %d", r);
+	if((r=sys_vmctl(SELF, VMCTL_I386_INVLPG, m)) != OK) {
+		panic("VMCTL_I386_INVLPG failed: %d", r);
 	}
 
 	return;