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kernel: invlpg facility

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. only use for single-page invalidations initially
	. shows tiny but statistically significant performance
	  improvement; will be more helpful in certain VM debug
	  modes
This commit is contained in:
Ben Gras 2011-08-01 15:35:34 +02:00
parent 55c6f3f507
commit 35cc7fbeb8
4 changed files with 23 additions and 4 deletions
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6
kernel/arch/i386/arch_do_vmctl.c
View file

@ -61,6 +61,12 @@ struct proc *p;
reload_cr3();
return OK;
}
case VMCTL_I386_INVLPG:
{
i386_invlpg(m_ptr->SVMCTL_VALUE);
return OK;
}
}

1
kernel/arch/i386/include/arch_proto.h
View file

@ -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) );

12
kernel/arch/i386/klib.S
View file

@ -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 */
/*===========================================================================*/

8
servers/vm/arch/i386/pagetable.c
View file

@ -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;