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xen-mapcache: replace last_address_index with a last_entry pointer 

Replace last_address_index and last_address_vaddr with a single pointer
to the last MapCacheEntry used.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Stefano Stabellini 2013-04-02 13:23:40 +00:00
parent 162cbbd173
commit e2deee3ea6
1 changed files with 16 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
xen-mapcache.c
View File

@ -74,8 +74,7 @@ typedef struct MapCache {
QTAILQ_HEAD(map_cache_head, MapCacheRev) locked_entries;
/* For most cases (>99.9%), the page address is the same. */
hwaddr last_address_index;
uint8_t *last_address_vaddr;
MapCacheEntry *last_entry;
unsigned long max_mcache_size;
unsigned int mcache_bucket_shift;
@ -105,7 +104,6 @@ void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
mapcache->opaque = opaque;
QTAILQ_INIT(&mapcache->locked_entries);
mapcache->last_address_index = -1;
if (geteuid() == 0) {
rlimit_as.rlim_cur = RLIM_INFINITY;
@ -210,9 +208,11 @@ tryagain:
trace_xen_map_cache(phys_addr);
if (address_index == mapcache->last_address_index && !lock && !__size) {
trace_xen_map_cache_return(mapcache->last_address_vaddr + address_offset);
return mapcache->last_address_vaddr + address_offset;
if (mapcache->last_entry != NULL &&
mapcache->last_entry->paddr_index == address_index &&
!lock && !__size) {
trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
return mapcache->last_entry->vaddr_base + address_offset;
}
/* size is always a multiple of MCACHE_BUCKET_SIZE */
@ -249,7 +249,7 @@ tryagain:
if(!test_bits(address_offset >> XC_PAGE_SHIFT, size >> XC_PAGE_SHIFT,
entry->valid_mapping)) {
mapcache->last_address_index = -1;
mapcache->last_entry = NULL;
if (!translated && mapcache->phys_offset_to_gaddr) {
phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size, mapcache->opaque);
translated = true;
@ -259,19 +259,18 @@ tryagain:
return NULL;
}
mapcache->last_address_index = address_index;
mapcache->last_address_vaddr = entry->vaddr_base;
mapcache->last_entry = entry;
if (lock) {
MapCacheRev *reventry = g_malloc0(sizeof(MapCacheRev));
entry->lock++;
reventry->vaddr_req = mapcache->last_address_vaddr + address_offset;
reventry->paddr_index = mapcache->last_address_index;
reventry->vaddr_req = mapcache->last_entry->vaddr_base + address_offset;
reventry->paddr_index = mapcache->last_entry->paddr_index;
reventry->size = entry->size;
QTAILQ_INSERT_HEAD(&mapcache->locked_entries, reventry, next);
}
trace_xen_map_cache_return(mapcache->last_address_vaddr + address_offset);
return mapcache->last_address_vaddr + address_offset;
trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
return mapcache->last_entry->vaddr_base + address_offset;
}
ram_addr_t xen_ram_addr_from_mapcache(void *ptr)
@ -338,9 +337,9 @@ void xen_invalidate_map_cache_entry(uint8_t *buffer)
QTAILQ_REMOVE(&mapcache->locked_entries, reventry, next);
g_free(reventry);
if (mapcache->last_address_index == paddr_index) {
mapcache->last_address_index = -1;
mapcache->last_address_vaddr = NULL;
if (mapcache->last_entry != NULL &&
mapcache->last_entry->paddr_index == paddr_index) {
mapcache->last_entry = NULL;
}
entry = &mapcache->entry[paddr_index % mapcache->nr_buckets];
@ -404,8 +403,7 @@ void xen_invalidate_map_cache(void)
entry->valid_mapping = NULL;
}
mapcache->last_address_index = -1;
mapcache->last_address_vaddr = NULL;
mapcache->last_entry = NULL;
mapcache_unlock();
}