JIT statistics

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1244 c046a42c-6fe2-441c-8c8c-71466251a162

3 files changed, 67 insertions, 2 deletions

diff --git a/cpu-all.h b/cpu-all.h
index 303fab0c1b..d395c0038b 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -742,4 +742,7 @@ static inline void cpu_physical_memory_set_dirty(target_ulong addr)
 
 void cpu_physical_memory_reset_dirty(target_ulong start, target_ulong end);
 
+void dump_exec_info(FILE *f,
+                    int (*cpu_fprintf)(FILE *f, const char *fmt, ...));
+
 #endif /* CPU_ALL_H */
diff --git a/exec.c b/exec.c
index 3057750feb..40bd60a9f0 100644
--- a/exec.c
+++ b/exec.c
@@ -128,6 +128,11 @@ char *logfilename = "/tmp/qemu.log";
 FILE *logfile;
 int loglevel;
 
+/* statistics */
+static int tlb_flush_count;
+static int tb_flush_count;
+static int tb_phys_invalidate_count;
+
 static void page_init(void)
 {
     /* NOTE: we can always suppose that qemu_host_page_size >=
@@ -336,6 +341,7 @@ void tb_flush(CPUState *env)
     code_gen_ptr = code_gen_buffer;
     /* XXX: flush processor icache at this point if cache flush is
        expensive */
+    tb_flush_count++;
 }
 
 #ifdef DEBUG_TB_CHECK
@@ -530,6 +536,7 @@ static inline void tb_phys_invalidate(TranslationBlock *tb, unsigned int page_ad
     }
 
     tb_invalidate(tb);
+    tb_phys_invalidate_count++;
 }
 
 static inline void set_bits(uint8_t *tab, int start, int len)
@@ -1298,6 +1305,7 @@ void tlb_flush(CPUState *env, int flush_global)
 #if !defined(CONFIG_SOFTMMU)
     munmap((void *)MMAP_AREA_START, MMAP_AREA_END - MMAP_AREA_START);
 #endif
+    tlb_flush_count++;
 }
 
 static inline void tlb_flush_entry(CPUTLBEntry *tlb_entry, target_ulong addr)
@@ -2137,6 +2145,53 @@ int cpu_memory_rw_debug(CPUState *env, target_ulong addr,
     return 0;
 }
 
+void dump_exec_info(FILE *f,
+                    int (*cpu_fprintf)(FILE *f, const char *fmt, ...))
+{
+    int i, target_code_size, max_target_code_size;
+    int direct_jmp_count, direct_jmp2_count, cross_page;
+    TranslationBlock *tb;
+    
+    target_code_size = 0;
+    max_target_code_size = 0;
+    cross_page = 0;
+    direct_jmp_count = 0;
+    direct_jmp2_count = 0;
+    for(i = 0; i < nb_tbs; i++) {
+        tb = &tbs[i];
+        target_code_size += tb->size;
+        if (tb->size > max_target_code_size)
+            max_target_code_size = tb->size;
+        if (tb->page_addr[1] != -1)
+            cross_page++;
+        if (tb->tb_next_offset[0] != 0xffff) {
+            direct_jmp_count++;
+            if (tb->tb_next_offset[1] != 0xffff) {
+                direct_jmp2_count++;
+            }
+        }
+    }
+    /* XXX: avoid using doubles ? */
+    cpu_fprintf(f, "TB count            %d\n", nb_tbs);
+    cpu_fprintf(f, "TB avg target size  %d max=%d bytes\n", 
+                nb_tbs ? target_code_size / nb_tbs : 0,
+                max_target_code_size);
+    cpu_fprintf(f, "TB avg host size    %d bytes (expansion ratio: %0.1f)\n", 
+                nb_tbs ? (code_gen_ptr - code_gen_buffer) / nb_tbs : 0,
+                target_code_size ? (double) (code_gen_ptr - code_gen_buffer) / target_code_size : 0);
+    cpu_fprintf(f, "cross page TB count %d (%d%%)\n", 
+            cross_page, 
+            nb_tbs ? (cross_page * 100) / nb_tbs : 0);
+    cpu_fprintf(f, "direct jump count   %d (%d%%) (2 jumps=%d %d%%)\n",
+                direct_jmp_count, 
+                nb_tbs ? (direct_jmp_count * 100) / nb_tbs : 0,
+                direct_jmp2_count,
+                nb_tbs ? (direct_jmp2_count * 100) / nb_tbs : 0);
+    cpu_fprintf(f, "TB flush count      %d\n", tb_flush_count);
+    cpu_fprintf(f, "TB invalidate count %d\n", tb_phys_invalidate_count);
+    cpu_fprintf(f, "TLB flush count     %d\n", tlb_flush_count);
+}
+
 #if !defined(CONFIG_USER_ONLY) 
 
 #define MMUSUFFIX _cmmu
diff --git a/monitor.c b/monitor.c
index cfb9c49755..ae1ce8792f 100644
--- a/monitor.c
+++ b/monitor.c
@@ -220,14 +220,19 @@ static void do_info_block(void)
 static void do_info_registers(void)
 {
 #ifdef TARGET_I386
-    cpu_dump_state(cpu_single_env, stdout, monitor_fprintf,
+    cpu_dump_state(cpu_single_env, NULL, monitor_fprintf,
                    X86_DUMP_FPU | X86_DUMP_CCOP);
 #else
-    cpu_dump_state(cpu_single_env, stdout, monitor_fprintf, 
+    cpu_dump_state(cpu_single_env, NULL, monitor_fprintf, 
                    0);
 #endif
 }
 
+static void do_info_jit(void)
+{
+    dump_exec_info(NULL, monitor_fprintf);
+}
+
 static void do_info_history (void)
 {
     int i;
@@ -893,6 +898,8 @@ static term_cmd_t info_cmds[] = {
     { "mem", "", mem_info,
       "", "show the active virtual memory mappings", },
 #endif
+    { "jit", "", do_info_jit,
+      "", "show dynamic compiler info", },
     { NULL, NULL, },
 };