diff options
| -rw-r--r-- | include/exec/tb-context.h | 3 | ||||
| -rw-r--r-- | tcg/tcg.c | 20 | ||||
| -rw-r--r-- | tcg/tcg.h | 2 | ||||
| -rw-r--r-- | translate-all.c | 39 |
4 files changed, 47 insertions, 17 deletions
diff --git a/include/exec/tb-context.h b/include/exec/tb-context.h index c7f17f26e0..25c2afe753 100644 --- a/include/exec/tb-context.h +++ b/include/exec/tb-context.h @@ -31,8 +31,9 @@ typedef struct TBContext TBContext; struct TBContext { - TranslationBlock *tbs; + TranslationBlock **tbs; struct qht htable; + size_t tbs_size; int nb_tbs; /* any access to the tbs or the page table must use this lock */ QemuMutex tb_lock; @@ -383,6 +383,26 @@ void tcg_context_init(TCGContext *s) } } +/* + * Allocate TBs right before their corresponding translated code, making + * sure that TBs and code are on different cache lines. + */ +TranslationBlock *tcg_tb_alloc(TCGContext *s) +{ + uintptr_t align = qemu_icache_linesize; + TranslationBlock *tb; + void *next; + + tb = (void *)ROUND_UP((uintptr_t)s->code_gen_ptr, align); + next = (void *)ROUND_UP((uintptr_t)(tb + 1), align); + + if (unlikely(next > s->code_gen_highwater)) { + return NULL; + } + s->code_gen_ptr = next; + return tb; +} + void tcg_prologue_init(TCGContext *s) { size_t prologue_size, total_size; @@ -697,7 +697,6 @@ struct TCGContext { here, because there's too much arithmetic throughout that relies on addition and subtraction working on bytes. Rely on the GCC extension that allows arithmetic on void*. */ - int code_gen_max_blocks; void *code_gen_prologue; void *code_gen_epilogue; void *code_gen_buffer; @@ -756,6 +755,7 @@ static inline bool tcg_op_buf_full(void) /* tb_lock must be held for tcg_malloc_internal. */ void *tcg_malloc_internal(TCGContext *s, int size); void tcg_pool_reset(TCGContext *s); +TranslationBlock *tcg_tb_alloc(TCGContext *s); void tb_lock(void); void tb_unlock(void); diff --git a/translate-all.c b/translate-all.c index b3ee876526..bb094ad0db 100644 --- a/translate-all.c +++ b/translate-all.c @@ -781,12 +781,13 @@ static inline void code_gen_alloc(size_t tb_size) exit(1); } - /* Estimate a good size for the number of TBs we can support. We - still haven't deducted the prologue from the buffer size here, - but that's minimal and won't affect the estimate much. */ - tcg_ctx.code_gen_max_blocks - = tcg_ctx.code_gen_buffer_size / CODE_GEN_AVG_BLOCK_SIZE; - tcg_ctx.tb_ctx.tbs = g_new(TranslationBlock, tcg_ctx.code_gen_max_blocks); + /* size this conservatively -- realloc later if needed */ + tcg_ctx.tb_ctx.tbs_size = + tcg_ctx.code_gen_buffer_size / CODE_GEN_AVG_BLOCK_SIZE / 8; + if (unlikely(!tcg_ctx.tb_ctx.tbs_size)) { + tcg_ctx.tb_ctx.tbs_size = 64 * 1024; + } + tcg_ctx.tb_ctx.tbs = g_new(TranslationBlock *, tcg_ctx.tb_ctx.tbs_size); qemu_mutex_init(&tcg_ctx.tb_ctx.tb_lock); } @@ -828,13 +829,20 @@ bool tcg_enabled(void) static TranslationBlock *tb_alloc(target_ulong pc) { TranslationBlock *tb; + TBContext *ctx; assert_tb_locked(); - if (tcg_ctx.tb_ctx.nb_tbs >= tcg_ctx.code_gen_max_blocks) { + tb = tcg_tb_alloc(&tcg_ctx); + if (unlikely(tb == NULL)) { return NULL; } - tb = &tcg_ctx.tb_ctx.tbs[tcg_ctx.tb_ctx.nb_tbs++]; + ctx = &tcg_ctx.tb_ctx; + if (unlikely(ctx->nb_tbs == ctx->tbs_size)) { + ctx->tbs_size *= 2; + ctx->tbs = g_renew(TranslationBlock *, ctx->tbs, ctx->tbs_size); + } + ctx->tbs[ctx->nb_tbs++] = tb; tb->pc = pc; tb->cflags = 0; tb->invalid = false; @@ -850,8 +858,10 @@ void tb_free(TranslationBlock *tb) Ignore the hard cases and just back up if this TB happens to be the last one generated. */ if (tcg_ctx.tb_ctx.nb_tbs > 0 && - tb == &tcg_ctx.tb_ctx.tbs[tcg_ctx.tb_ctx.nb_tbs - 1]) { - tcg_ctx.code_gen_ptr = tb->tc_ptr; + tb == tcg_ctx.tb_ctx.tbs[tcg_ctx.tb_ctx.nb_tbs - 1]) { + size_t struct_size = ROUND_UP(sizeof(*tb), qemu_icache_linesize); + + tcg_ctx.code_gen_ptr = tb->tc_ptr - struct_size; tcg_ctx.tb_ctx.nb_tbs--; } } @@ -1666,7 +1676,7 @@ static TranslationBlock *tb_find_pc(uintptr_t tc_ptr) m_max = tcg_ctx.tb_ctx.nb_tbs - 1; while (m_min <= m_max) { m = (m_min + m_max) >> 1; - tb = &tcg_ctx.tb_ctx.tbs[m]; + tb = tcg_ctx.tb_ctx.tbs[m]; v = (uintptr_t)tb->tc_ptr; if (v == tc_ptr) { return tb; @@ -1676,7 +1686,7 @@ static TranslationBlock *tb_find_pc(uintptr_t tc_ptr) m_min = m + 1; } } - return &tcg_ctx.tb_ctx.tbs[m_max]; + return tcg_ctx.tb_ctx.tbs[m_max]; } #if !defined(CONFIG_USER_ONLY) @@ -1874,7 +1884,7 @@ void dump_exec_info(FILE *f, fprintf_function cpu_fprintf) direct_jmp_count = 0; direct_jmp2_count = 0; for (i = 0; i < tcg_ctx.tb_ctx.nb_tbs; i++) { - tb = &tcg_ctx.tb_ctx.tbs[i]; + tb = tcg_ctx.tb_ctx.tbs[i]; target_code_size += tb->size; if (tb->size > max_target_code_size) { max_target_code_size = tb->size; @@ -1894,8 +1904,7 @@ void dump_exec_info(FILE *f, fprintf_function cpu_fprintf) cpu_fprintf(f, "gen code size %td/%zd\n", tcg_ctx.code_gen_ptr - tcg_ctx.code_gen_buffer, tcg_ctx.code_gen_highwater - tcg_ctx.code_gen_buffer); - cpu_fprintf(f, "TB count %d/%d\n", - tcg_ctx.tb_ctx.nb_tbs, tcg_ctx.code_gen_max_blocks); + cpu_fprintf(f, "TB count %d\n", tcg_ctx.tb_ctx.nb_tbs); cpu_fprintf(f, "TB avg target size %d max=%d bytes\n", tcg_ctx.tb_ctx.nb_tbs ? target_code_size / tcg_ctx.tb_ctx.nb_tbs : 0, |