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exec: change ramlist from MRU order to a 1-item cache 

Most of the time, only 2 items will be active (from/to for a string operation,
or code/data).  But TCG guests likely won't have gigabytes of memory, so
this actually goes down to 1 item.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
master
Paolo Bonzini 2012-11-14 15:45:02 +01:00 committed by Juan Quintela
parent 803ef03257
commit 0d6d3c87a2
3 changed files with 30 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch_init.c
View File

@ -48,6 +48,7 @@
#include "qemu/config-file.h"
#include "qmp-commands.h"
#include "trace.h"
#include "exec/cpu-all.h"
#ifdef DEBUG_ARCH_INIT
#define DPRINTF(fmt, ...) \

49
exec.c
View File

@ -43,6 +43,7 @@
#include "sysemu/xen-mapcache.h"
#include "trace.h"
#endif
#include "exec/cpu-all.h"
#include "exec/cputlb.h"
#include "translate-all.h"
@ -1043,6 +1044,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
new_block->length = size;
QLIST_INSERT_HEAD(&ram_list.blocks, new_block, next);
ram_list.mru_block = NULL;
ram_list.phys_dirty = g_realloc(ram_list.phys_dirty,
last_ram_offset() >> TARGET_PAGE_BITS);
@ -1071,6 +1073,7 @@ void qemu_ram_free_from_ptr(ram_addr_t addr)
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (addr == block->offset) {
QLIST_REMOVE(block, next);
ram_list.mru_block = NULL;
g_free(block);
return;
}
@ -1084,6 +1087,7 @@ void qemu_ram_free(ram_addr_t addr)
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (addr == block->offset) {
QLIST_REMOVE(block, next);
ram_list.mru_block = NULL;
if (block->flags & RAM_PREALLOC_MASK) {
;
} else if (mem_path) {
@ -1189,37 +1193,40 @@ void *qemu_get_ram_ptr(ram_addr_t addr)
{
RAMBlock *block;
block = ram_list.mru_block;
if (block && addr - block->offset < block->length) {
goto found;
}
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (addr - block->offset < block->length) {
/* Move this entry to to start of the list. */
if (block != QLIST_FIRST(&ram_list.blocks)) {
QLIST_REMOVE(block, next);
QLIST_INSERT_HEAD(&ram_list.blocks, block, next);
}
if (xen_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 xen_map_cache(addr, 0, 0);
} else if (block->host == NULL) {
block->host =
xen_map_cache(block->offset, block->length, 1);
}
}
return block->host + (addr - block->offset);
goto found;
}
}
fprintf(stderr, "Bad ram offset %" PRIx64 "\n", (uint64_t)addr);
abort();
return NULL;
found:
ram_list.mru_block = block;
if (xen_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 xen_map_cache(addr, 0, 0);
} else if (block->host == NULL) {
block->host =
xen_map_cache(block->offset, block->length, 1);
}
}
return block->host + (addr - block->offset);
}
/* Return a host pointer to ram allocated with qemu_ram_alloc.
* Same as qemu_get_ram_ptr but avoid reordering ramblocks.
/* Return a host pointer to ram allocated with qemu_ram_alloc. Same as
* qemu_get_ram_ptr but do not touch ram_list.mru_block.
*
* ??? Is this still necessary?
*/
static void *qemu_safe_ram_ptr(ram_addr_t addr)
{

1
include/exec/cpu-all.h
View File

@ -495,6 +495,7 @@ typedef struct RAMBlock {
typedef struct RAMList {
uint8_t *phys_dirty;
RAMBlock *mru_block;
QLIST_HEAD(, RAMBlock) blocks;
} RAMList;
extern RAMList ram_list;