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variable dynamic translation buffer size

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4600 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2008-05-28 12:30:31 +00:00
parent bed5cc5207
commit 26a5f13b8e
7 changed files with 88 additions and 54 deletions
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1
cpu-all.h
View File

@ -767,6 +767,7 @@ int page_get_flags(target_ulong address);
void page_set_flags(target_ulong start, target_ulong end, int flags);
int page_check_range(target_ulong start, target_ulong len, int flags);
void cpu_exec_init_all(unsigned long tb_size);
CPUState *cpu_copy(CPUState *env);
void cpu_dump_state(CPUState *env, FILE *f,

1
darwin-user/main.c
View File

@ -873,6 +873,7 @@ int main(int argc, char **argv)
#endif
}
cpu_exec_init_all(0);
/* NOTE: we need to init the CPU at this stage to get
qemu_host_page_size */
env = cpu_init(cpu_model);

37
exec-all.h
View File

@ -56,12 +56,6 @@ typedef void (GenOpFunc1)(long);
typedef void (GenOpFunc2)(long, long);
typedef void (GenOpFunc3)(long, long, long);
#if defined(TARGET_I386)
void optimize_flags_init(void);
#endif
extern FILE *logfile;
extern int loglevel;
@ -105,31 +99,7 @@ static inline int tlb_set_page(CPUState *env1, target_ulong vaddr,
#define CODE_GEN_PHYS_HASH_BITS 15
#define CODE_GEN_PHYS_HASH_SIZE (1 << CODE_GEN_PHYS_HASH_BITS)
/* maximum total translate dcode allocated */
/* NOTE: the translated code area cannot be too big because on some
archs the range of "fast" function calls is limited. Here is a
summary of the ranges:
i386 : signed 32 bits
arm : signed 26 bits
ppc : signed 24 bits
sparc : signed 32 bits
alpha : signed 23 bits
*/
#if defined(__alpha__)
#define CODE_GEN_BUFFER_SIZE (2 * 1024 * 1024)
#elif defined(__ia64)
#define CODE_GEN_BUFFER_SIZE (4 * 1024 * 1024) /* range of addl */
#elif defined(__powerpc__)
#define CODE_GEN_BUFFER_SIZE (6 * 1024 * 1024)
#else
/* XXX: make it dynamic on x86 */
#define CODE_GEN_BUFFER_SIZE (64 * 1024 * 1024)
#endif
//#define CODE_GEN_BUFFER_SIZE (128 * 1024)
#define MIN_CODE_GEN_BUFFER_SIZE (1024 * 1024)
/* estimated block size for TB allocation */
/* XXX: use a per code average code fragment size and modulate it
@ -140,8 +110,6 @@ static inline int tlb_set_page(CPUState *env1, target_ulong vaddr,
#define CODE_GEN_AVG_BLOCK_SIZE 64
#endif
#define CODE_GEN_MAX_BLOCKS (CODE_GEN_BUFFER_SIZE / CODE_GEN_AVG_BLOCK_SIZE)
#if defined(__powerpc__) || defined(__x86_64__) || defined(__arm__)
#define USE_DIRECT_JUMP
#endif
@ -210,9 +178,8 @@ void tb_link_phys(TranslationBlock *tb,
target_ulong phys_pc, target_ulong phys_page2);
extern TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE];
extern uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE];
extern uint8_t *code_gen_ptr;
extern int code_gen_max_blocks;
#if defined(USE_DIRECT_JUMP)

86
exec.c
View File

@ -58,9 +58,6 @@
#undef DEBUG_TB_CHECK
#endif
/* threshold to flush the translated code buffer */
#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - code_gen_max_block_size())
#define SMC_BITMAP_USE_THRESHOLD 10
#define MMAP_AREA_START 0x00000000
@ -85,13 +82,17 @@
#endif
TranslationBlock *tbs;
int code_gen_max_blocks;
TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE];
int nb_tbs;
/* any access to the tbs or the page table must use this lock */
spinlock_t tb_lock = SPIN_LOCK_UNLOCKED;
uint8_t code_gen_prologue[1024] __attribute__((aligned (32)));
uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE] __attribute__((aligned (32)));
uint8_t *code_gen_buffer;
unsigned long code_gen_buffer_size;
/* threshold to flush the translated code buffer */
unsigned long code_gen_buffer_max_size;
uint8_t *code_gen_ptr;
ram_addr_t phys_ram_size;
@ -215,9 +216,6 @@ static void page_init(void)
#else
qemu_real_host_page_size = getpagesize();
#endif
map_exec(code_gen_buffer, sizeof(code_gen_buffer));
map_exec(code_gen_prologue, sizeof(code_gen_prologue));
if (qemu_host_page_size == 0)
qemu_host_page_size = qemu_real_host_page_size;
if (qemu_host_page_size < TARGET_PAGE_SIZE)
@ -328,18 +326,67 @@ static void tlb_unprotect_code_phys(CPUState *env, ram_addr_t ram_addr,
target_ulong vaddr);
#endif
void code_gen_alloc(unsigned long tb_size)
{
code_gen_buffer_size = tb_size;
if (code_gen_buffer_size == 0) {
/* XXX: needs ajustments */
code_gen_buffer_size = (int)(phys_ram_size / 4);
}
if (code_gen_buffer_size < MIN_CODE_GEN_BUFFER_SIZE)
code_gen_buffer_size = MIN_CODE_GEN_BUFFER_SIZE;
/* The code gen buffer location may have constraints depending on
the host cpu and OS */
#if defined(__linux__)
{
int flags;
flags = MAP_PRIVATE | MAP_ANONYMOUS;
#if defined(__x86_64__)
flags |= MAP_32BIT;
/* Cannot map more than that */
if (code_gen_buffer_size > (800 * 1024 * 1024))
code_gen_buffer_size = (800 * 1024 * 1024);
#endif
code_gen_buffer = mmap(NULL, code_gen_buffer_size,
PROT_WRITE | PROT_READ | PROT_EXEC,
flags, -1, 0);
if (code_gen_buffer == MAP_FAILED) {
fprintf(stderr, "Could not allocate dynamic translator buffer\n");
exit(1);
}
}
#else
code_gen_buffer = qemu_malloc(code_gen_buffer_size);
if (!code_gen_buffer) {
fprintf(stderr, "Could not allocate dynamic translator buffer\n");
exit(1);
}
map_exec(code_gen_buffer, code_gen_buffer_size);
#endif
map_exec(code_gen_prologue, sizeof(code_gen_prologue));
code_gen_buffer_max_size = code_gen_buffer_size -
code_gen_max_block_size();
code_gen_max_blocks = code_gen_buffer_size / CODE_GEN_AVG_BLOCK_SIZE;
tbs = qemu_malloc(code_gen_max_blocks * sizeof(TranslationBlock));
}
/* Must be called before using the QEMU cpus. 'tb_size' is the size
(in bytes) allocated to the translation buffer. Zero means default
size. */
void cpu_exec_init_all(unsigned long tb_size)
{
page_init();
cpu_gen_init();
code_gen_alloc(tb_size);
code_gen_ptr = code_gen_buffer;
io_mem_init();
}
void cpu_exec_init(CPUState *env)
{
CPUState **penv;
int cpu_index;
if (!code_gen_ptr) {
cpu_gen_init();
tbs = qemu_malloc(CODE_GEN_MAX_BLOCKS * sizeof(TranslationBlock));
code_gen_ptr = code_gen_buffer;
page_init();
io_mem_init();
}
env->next_cpu = NULL;
penv = &first_cpu;
cpu_index = 0;
@ -390,7 +437,7 @@ void tb_flush(CPUState *env1)
nb_tbs, nb_tbs > 0 ?
((unsigned long)(code_gen_ptr - code_gen_buffer)) / nb_tbs : 0);
#endif
if ((unsigned long)(code_gen_ptr - code_gen_buffer) > CODE_GEN_BUFFER_SIZE)
if ((unsigned long)(code_gen_ptr - code_gen_buffer) > code_gen_buffer_size)
cpu_abort(env1, "Internal error: code buffer overflow\n");
nb_tbs = 0;
@ -960,8 +1007,8 @@ TranslationBlock *tb_alloc(target_ulong pc)
{
TranslationBlock *tb;
if (nb_tbs >= CODE_GEN_MAX_BLOCKS ||
(code_gen_ptr - code_gen_buffer) >= CODE_GEN_BUFFER_MAX_SIZE)
if (nb_tbs >= code_gen_max_blocks ||
(code_gen_ptr - code_gen_buffer) >= code_gen_buffer_max_size)
return NULL;
tb = &tbs[nb_tbs++];
tb->pc = pc;
@ -2990,7 +3037,10 @@ void dump_exec_info(FILE *f,
}
/* XXX: avoid using doubles ? */
cpu_fprintf(f, "Translation buffer state:\n");
cpu_fprintf(f, "TB count %d\n", nb_tbs);
cpu_fprintf(f, "gen code size %ld/%ld\n",
code_gen_ptr - code_gen_buffer, code_gen_buffer_max_size);
cpu_fprintf(f, "TB count %d/%d\n",
nb_tbs, code_gen_max_blocks);
cpu_fprintf(f, "TB avg target size %d max=%d bytes\n",
nb_tbs ? target_code_size / nb_tbs : 0,
max_target_code_size);

1
linux-user/main.c
View File

@ -2115,6 +2115,7 @@ int main(int argc, char **argv)
cpu_model = "any";
#endif
}
cpu_exec_init_all(0);
/* NOTE: we need to init the CPU at this stage to get
qemu_host_page_size */
env = cpu_init(cpu_model);

2
target-i386/cpu.h
View File

@ -723,6 +723,8 @@ static inline int cpu_mmu_index (CPUState *env)
return (env->hflags & HF_CPL_MASK) == 3 ? 1 : 0;
}
void optimize_flags_init(void);
typedef struct CCTable {
int (*compute_all)(void); /* return all the flags */
int (*compute_c)(void); /* return the C flag */

14
vl.c
View File

@ -7378,6 +7378,7 @@ enum {
QEMU_OPTION_old_param,
QEMU_OPTION_clock,
QEMU_OPTION_startdate,
QEMU_OPTION_tb_size,
};
typedef struct QEMUOption {
@ -7489,6 +7490,7 @@ const QEMUOption qemu_options[] = {
#endif
{ "clock", HAS_ARG, QEMU_OPTION_clock },
{ "startdate", HAS_ARG, QEMU_OPTION_startdate },
{ "tb-size", HAS_ARG, QEMU_OPTION_tb_size },
{ NULL },
};
@ -7697,6 +7699,7 @@ int main(int argc, char **argv)
const char *usb_devices[MAX_USB_CMDLINE];
int usb_devices_index;
int fds[2];
int tb_size;
const char *pid_file = NULL;
VLANState *vlan;
@ -7768,8 +7771,9 @@ int main(int argc, char **argv)
hda_index = -1;
nb_nics = 0;
/* default mac address of the first network interface */
tb_size = 0;
optind = 1;
for(;;) {
if (optind >= argc)
@ -8296,6 +8300,11 @@ int main(int argc, char **argv)
}
}
break;
case QEMU_OPTION_tb_size:
tb_size = strtol(optarg, NULL, 0);
if (tb_size < 0)
tb_size = 0;
break;
}
}
}
@ -8467,6 +8476,9 @@ int main(int argc, char **argv)
exit(1);
}
/* init the dynamic translator */
cpu_exec_init_all(tb_size * 1024 * 1024);
bdrv_init();
/* we always create the cdrom drive, even if no disk is there */