Mailing List Archive

# HG changeset patch
# User Alex Williamson <alex.williamson@hp.com>
# Date 1184528447 21600
# Node ID 834ac63f4894443dd825ef0d9ef478fb48416d43
# Parent 2796311c6a5537cff38bba20b74a1e64a1d9e909
[IA64] Speedup ptc.e emulation

This patch makes ptc.e emulation faster.
It defers the initialization of collision chain area of VHPT.
Also removes an unused field from struct thash_cb.

Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>
---
xen/arch/ia64/vmx/vtlb.c | 49 +++++++++++++++++---------------------------
xen/include/asm-ia64/vmmu.h | 2 -
2 files changed, 20 insertions(+), 31 deletions(-)

diff -r 2796311c6a55 -r 834ac63f4894 xen/arch/ia64/vmx/vtlb.c
--- a/xen/arch/ia64/vmx/vtlb.c Sun Jul 15 13:32:56 2007 -0600
+++ b/xen/arch/ia64/vmx/vtlb.c Sun Jul 15 13:40:47 2007 -0600
@@ -36,19 +36,10 @@

thash_data_t *__alloc_chain(thash_cb_t *);

-static void cch_mem_init(thash_cb_t *hcb)
-{
- int num;
- thash_data_t *p;
-
- hcb->cch_freelist = p = hcb->cch_buf;
- num = (hcb->cch_sz/sizeof(thash_data_t))-1;
- do{
- p->next =p+1;
- p++;
- num--;
- }while(num);
- p->next = NULL;
+static inline void cch_mem_init(thash_cb_t *hcb)
+{
+ hcb->cch_free_idx = 0;
+ hcb->cch_freelist = NULL;
}

static thash_data_t *cch_alloc(thash_cb_t *hcb)
@@ -56,8 +47,16 @@ static thash_data_t *cch_alloc(thash_cb_
thash_data_t *p;
if ( (p = hcb->cch_freelist) != NULL ) {
hcb->cch_freelist = p->next;
- }
- return p;
+ return p;
+ }
+ if (hcb->cch_free_idx < hcb->cch_sz/sizeof(thash_data_t)) {
+ p = &((thash_data_t *)hcb->cch_buf)[hcb->cch_free_idx++];
+ p->page_flags = 0;
+ p->itir = 0;
+ p->next = NULL;
+ return p;
+ }
+ return NULL;
}

/*
@@ -668,13 +667,12 @@ void thash_init(thash_cb_t *hcb, u64 sz)
void thash_init(thash_cb_t *hcb, u64 sz)
{
int num;
- thash_data_t *head, *p;
+ thash_data_t *head;

hcb->pta.val = (unsigned long)hcb->hash;
hcb->pta.vf = 1;
hcb->pta.ve = 1;
hcb->pta.size = sz;
- hcb->cch_rec_head = hcb->hash;

head=hcb->hash;
num = (hcb->hash_sz/sizeof(thash_data_t));
@@ -686,16 +684,7 @@ void thash_init(thash_cb_t *hcb, u64 sz)
head++;
num--;
}while(num);
-
- hcb->cch_freelist = p = hcb->cch_buf;
- num = hcb->cch_sz / sizeof(thash_data_t);
- do{
- p->page_flags = 0;
- p->itir = 0;
- p->next =p+1;
- p++;
- num--;
- }while(num);
-
- (p - 1)->next = NULL;
-}
+
+ hcb->cch_free_idx = 0;
+ hcb->cch_freelist = NULL;
+}
diff -r 2796311c6a55 -r 834ac63f4894 xen/include/asm-ia64/vmmu.h
--- a/xen/include/asm-ia64/vmmu.h Sun Jul 15 13:32:56 2007 -0600
+++ b/xen/include/asm-ia64/vmmu.h Sun Jul 15 13:40:47 2007 -0600
@@ -196,8 +196,8 @@ typedef struct thash_cb {
u64 hash_sz; // size of above data.
void *cch_buf; // base address of collision chain.
u64 cch_sz; // size of above data.
+ u64 cch_free_idx; // index of free entry.
thash_data_t *cch_freelist;
- thash_data_t *cch_rec_head; // cch recycle header
PTA pta;
} thash_cb_t;


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