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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2011-05-19 18:35:46 +0100
committerAlexander Graf <agraf@suse.de>2011-06-19 04:40:05 +0200
commit712c2b41490a986a5dd99bec99b854bac4322201 (patch)
treec044f52580916414afc691eff27de6e14f1a0b5e
parent38bee5dc94ee355640b030d28f311b03ee2f13d1 (diff)
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xen: mapcache performance improvements
Use qemu_invalidate_entry in cpu_physical_memory_unmap. Do not lock mapcache entries in qemu_get_ram_ptr if the address falls in the ramblock with offset == 0. We don't need to do that because the callers of qemu_get_ram_ptr either try to map an entire block, other from the main ramblock, or until the end of a page to implement a single read or write in the main ramblock. If we don't lock mapcache entries in qemu_get_ram_ptr we don't need to call qemu_invalidate_entry in qemu_put_ram_ptr anymore because we can leave with few long lived block mappings requested by devices. Also move the call to qemu_ram_addr_from_mapcache at the beginning of qemu_ram_addr_from_host. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Alexander Graf <agraf@suse.de>
-rw-r--r--exec.c28
1 files changed, 10 insertions, 18 deletions
diff --git a/exec.c b/exec.c
index 238c173..7f14332 100644
--- a/exec.c
+++ b/exec.c
@@ -3085,9 +3085,10 @@ void *qemu_get_ram_ptr(ram_addr_t addr)
if (xen_mapcache_enabled()) {
/* We need to check if the requested address is in the RAM
* because we don't want to map the entire memory in QEMU.
+ * In that case just map until the end of the page.
*/
if (block->offset == 0) {
- return qemu_map_cache(addr, 0, 1);
+ return qemu_map_cache(addr, 0, 0);
} else if (block->host == NULL) {
block->host = qemu_map_cache(block->offset, block->length, 1);
}
@@ -3114,9 +3115,10 @@ void *qemu_safe_ram_ptr(ram_addr_t addr)
if (xen_mapcache_enabled()) {
/* We need to check if the requested address is in the RAM
* because we don't want to map the entire memory in QEMU.
+ * In that case just map until the end of the page.
*/
if (block->offset == 0) {
- return qemu_map_cache(addr, 0, 1);
+ return qemu_map_cache(addr, 0, 0);
} else if (block->host == NULL) {
block->host = qemu_map_cache(block->offset, block->length, 1);
}
@@ -3159,10 +3161,6 @@ void *qemu_ram_ptr_length(target_phys_addr_t addr, target_phys_addr_t *size)
void qemu_put_ram_ptr(void *addr)
{
trace_qemu_put_ram_ptr(addr);
-
- if (xen_mapcache_enabled()) {
- qemu_invalidate_entry(block->host);
- }
}
int qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr)
@@ -3170,6 +3168,11 @@ int qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr)
RAMBlock *block;
uint8_t *host = ptr;
+ if (xen_mapcache_enabled()) {
+ *ram_addr = qemu_ram_addr_from_mapcache(ptr);
+ return 0;
+ }
+
QLIST_FOREACH(block, &ram_list.blocks, next) {
/* This case append when the block is not mapped. */
if (block->host == NULL) {
@@ -3181,11 +3184,6 @@ int qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr)
}
}
- if (xen_mapcache_enabled()) {
- *ram_addr = qemu_ram_addr_from_mapcache(ptr);
- return 0;
- }
-
return -1;
}
@@ -4086,13 +4084,7 @@ void cpu_physical_memory_unmap(void *buffer, target_phys_addr_t len,
}
}
if (xen_mapcache_enabled()) {
- uint8_t *buffer1 = buffer;
- uint8_t *end_buffer = buffer + len;
-
- while (buffer1 < end_buffer) {
- qemu_put_ram_ptr(buffer1);
- buffer1 += TARGET_PAGE_SIZE;
- }
+ qemu_invalidate_entry(buffer);
}
return;
}