Some hypercalls can be batched: lazy_hcall is the wrapper which
determines this, so it's pretty harmless to use lazy_hcall() instead of
hcall().
Before:
Time for one context switch via pipe: 6745 (6521 - 13966)
After:
Time for one context switch via pipe: 5406 (5170 - 7467)
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
---
drivers/lguest/lguest.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
===================================================================
--- a/drivers/lguest/lguest.c
+++ b/drivers/lguest/lguest.c
@@ -225,7 +225,7 @@ static unsigned long current_cr0, curren
static unsigned long current_cr0, current_cr3;
static void lguest_write_cr0(unsigned long val)
{
- hcall(LHCALL_TS, val & 8, 0, 0);
+ lazy_hcall(LHCALL_TS, val & 8, 0, 0);
current_cr0 = val;
}
@@ -247,7 +247,7 @@ static unsigned long lguest_read_cr2(voi
static void lguest_write_cr3(unsigned long cr3)
{
- hcall(LHCALL_NEW_PGTABLE, cr3, 0, 0);
+ lazy_hcall(LHCALL_NEW_PGTABLE, cr3, 0, 0);
current_cr3 = cr3;
}
@@ -287,7 +287,7 @@ static void lguest_set_pte(pte_t *ptep,
*ptep = pteval;
/* Don't bother with hypercall before initial setup. */
if (current_cr3)
- hcall(LHCALL_FLUSH_TLB, 1, 0, 0);
+ lazy_hcall(LHCALL_FLUSH_TLB, 1, 0, 0);
}
static void lguest_flush_tlb_single(unsigned long addr)
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