x86/tlb: replace INVALIDATE_TLB_VECTOR by CALL_FUNCTION_VECTOR

There are 32 INVALIDATE_TLB_VECTOR now in kernel. That is quite big
amount of vector in IDT. But it is still not enough, since modern x86
sever has more cpu number. That still causes heavy lock contention
in TLB flushing.

The patch using generic smp call function to replace it. That saved 32
vector number in IDT, and resolved the lock contention in TLB
flushing on large system.

In the NHM EX machine 4P * 8cores * HT = 64 CPUs, hackbench pthread
has 3% performance increase.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Link: http://lkml.kernel.org/r/1340845344-27557-9-git-send-email-alex.shi@intel.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 0 insertions, 73 deletions

diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 252981afd6c4..6e03b0d69138 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -171,79 +171,6 @@ static void __init smp_intr_init(void)
          */
         alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
 
-        /* IPIs for invalidation */
-#define ALLOC_INVTLB_VEC(NR) \
-        alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+NR, \
-                invalidate_interrupt##NR)
-
-        switch (NUM_INVALIDATE_TLB_VECTORS) {
-        default:
-                ALLOC_INVTLB_VEC(31);
-        case 31:
-                ALLOC_INVTLB_VEC(30);
-        case 30:
-                ALLOC_INVTLB_VEC(29);
-        case 29:
-                ALLOC_INVTLB_VEC(28);
-        case 28:
-                ALLOC_INVTLB_VEC(27);
-        case 27:
-                ALLOC_INVTLB_VEC(26);
-        case 26:
-                ALLOC_INVTLB_VEC(25);
-        case 25:
-                ALLOC_INVTLB_VEC(24);
-        case 24:
-                ALLOC_INVTLB_VEC(23);
-        case 23:
-                ALLOC_INVTLB_VEC(22);
-        case 22:
-                ALLOC_INVTLB_VEC(21);
-        case 21:
-                ALLOC_INVTLB_VEC(20);
-        case 20:
-                ALLOC_INVTLB_VEC(19);
-        case 19:
-                ALLOC_INVTLB_VEC(18);
-        case 18:
-                ALLOC_INVTLB_VEC(17);
-        case 17:
-                ALLOC_INVTLB_VEC(16);
-        case 16:
-                ALLOC_INVTLB_VEC(15);
-        case 15:
-                ALLOC_INVTLB_VEC(14);
-        case 14:
-                ALLOC_INVTLB_VEC(13);
-        case 13:
-                ALLOC_INVTLB_VEC(12);
-        case 12:
-                ALLOC_INVTLB_VEC(11);
-        case 11:
-                ALLOC_INVTLB_VEC(10);
-        case 10:
-                ALLOC_INVTLB_VEC(9);
-        case 9:
-                ALLOC_INVTLB_VEC(8);
-        case 8:
-                ALLOC_INVTLB_VEC(7);
-        case 7:
-                ALLOC_INVTLB_VEC(6);
-        case 6:
-                ALLOC_INVTLB_VEC(5);
-        case 5:
-                ALLOC_INVTLB_VEC(4);
-        case 4:
-                ALLOC_INVTLB_VEC(3);
-        case 3:
-                ALLOC_INVTLB_VEC(2);
-        case 2:
-                ALLOC_INVTLB_VEC(1);
-        case 1:
-                ALLOC_INVTLB_VEC(0);
-                break;
-        }
-
         /* IPI for generic function call */
         alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);