Adding tb_stats [start|pause|stop|filter] command to hmp.
This allows controlling the collection of statistics.
It is also possible to set the level of collection:
all, jit, or exec.
tb_stats filter allow to only collect statistics for the TB
in the last_search list.
The goal of this command is to allow the dynamic exploration
of the TCG behavior and quality. Therefore, for now, a
corresponding QMP command is not worthwhile.
Acked-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
Signed-off-by: Vanderson M. do Rosario <vanderson...@gmail.com>
---
accel/tcg/tb-stats.c | 110 ++++++++++++++++++++++++++++++++++
hmp-commands.hx | 17 ++++++
include/exec/tb-stats-flags.h | 1 +
include/exec/tb-stats.h | 11 ++++
monitor/misc.c | 47 +++++++++++++++
vl.c | 6 ++
6 files changed, 192 insertions(+)
diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c
index 66abc97ad4..9959477fbb 100644
--- a/accel/tcg/tb-stats.c
+++ b/accel/tcg/tb-stats.c
@@ -32,6 +32,9 @@
#include "exec/tb-stats.h"
+/* only accessed in safe work */
+static GList *last_search;
+
uint64_t dev_time;
struct jit_profile_info {
@@ -160,6 +163,95 @@ void dump_jit_profile_info(TCGProfile *s)
g_free(jpi);
}
+static void free_tbstats(void *p, uint32_t hash, void *userp)
+{
+ g_free(p);
+}
+
+static void clean_tbstats(void)
+{
+ /* remove all tb_stats */
+ qht_iter(&tb_ctx.tb_stats, free_tbstats, NULL);
+ qht_destroy(&tb_ctx.tb_stats);
+}
+
+void do_hmp_tbstats_safe(CPUState *cpu, run_on_cpu_data icmd)
+{
+ struct TbstatsCommand *cmdinfo = icmd.host_ptr;
+ int cmd = cmdinfo->cmd;
+ uint32_t level = cmdinfo->level;
+
+ switch (cmd) {
+ case START:
+ if (tb_stats_collection_paused()) {
+ set_tbstats_flags(level);
+ } else {
+ if (tb_stats_collection_enabled()) {
+ qemu_printf("TB information already being recorded");
+ return;
+ }
+ qht_init(&tb_ctx.tb_stats, tb_stats_cmp, CODE_GEN_HTABLE_SIZE,
+ QHT_MODE_AUTO_RESIZE);
+ }
+
+ set_default_tbstats_flag(level);
+ enable_collect_tb_stats();
+ tb_flush(cpu);
+ break;
+ case PAUSE:
+ if (!tb_stats_collection_enabled()) {
+ qemu_printf("TB information not being recorded");
+ return;
+ }
+
+ /* Continue to create TBStatistic structures but stop collecting
statistics */
+ pause_collect_tb_stats();
+ set_default_tbstats_flag(TB_NOTHING);
+ set_tbstats_flags(TB_PAUSED);
+ tb_flush(cpu);
+ break;
+ case STOP:
+ if (!tb_stats_collection_enabled()) {
+ qemu_printf("TB information not being recorded");
+ return;
+ }
+
+ /* Dissalloc all TBStatistics structures and stop creating new ones */
+ disable_collect_tb_stats();
+ clean_tbstats();
+ tb_flush(cpu);
+ break;
+ case FILTER:
+ if (!tb_stats_collection_enabled()) {
+ qemu_printf("TB information not being recorded");
+ return;
+ }
+ if (!last_search) {
+ qemu_printf("no search on record! execute info tbs before
filtering!");
+ return;
+ }
+
+ set_default_tbstats_flag(TB_NOTHING);
+
+ /* Set all tbstats as paused, then return only the ones from
last_search */
+ pause_collect_tb_stats();
+ set_tbstats_flags(TB_PAUSED);
+
+ for (GList *iter = last_search; iter; iter = g_list_next(iter)) {
+ TBStatistics *tbs = iter->data;
+ tbs->stats_enabled = level;
+ }
+
+ tb_flush(cpu);
+
+ break;
+ default: /* INVALID */
+ g_assert_not_reached();
+ break;
+ }
+
+ g_free(cmdinfo);
+}
void init_tb_stats_htable_if_not(void)
{
@@ -195,6 +287,24 @@ bool tb_stats_collection_paused(void)
return tcg_collect_tb_stats == TB_STATS_PAUSED;
}
+static void reset_tbstats_flag(void *p, uint32_t hash, void *userp)
+{
+ uint32_t flag = *((int *)userp);
+ TBStatistics *tbs = p;
+ tbs->stats_enabled = flag;
+}
+
+void set_default_tbstats_flag(uint32_t flag)
+{
+ default_tbstats_flag = flag;
+}
+
+void set_tbstats_flags(uint32_t flag)
+{
+ /* iterate over tbstats setting their flag as TB_NOTHING */
+ qht_iter(&tb_ctx.tb_stats, reset_tbstats_flag, &flag);
+}
+
uint32_t get_default_tbstats_flag(void)
{
return default_tbstats_flag;
diff --git a/hmp-commands.hx b/hmp-commands.hx
index cfcc044ce4..6cd2800378 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1886,6 +1886,23 @@ STEXI
@findex qemu-io
Executes a qemu-io command on the given block device.
+ETEXI
+#if defined(CONFIG_TCG)
+ {
+ .name = "tb_stats",
+ .args_type = "command:s,level:s?",
+ .params = "command [stats_level]",
+ .help = "Control tb statistics collection:"
+ "tb_stats (start|pause|stop|filter)
[all|jit_stats|exec_stats]",
+ .cmd = hmp_tbstats,
+ },
+#endif
+
+STEXI
+@item tb_stats
+@findex
+Control recording tb statistics
+
ETEXI
{
diff --git a/include/exec/tb-stats-flags.h b/include/exec/tb-stats-flags.h
index c936ac1084..16b563f858 100644
--- a/include/exec/tb-stats-flags.h
+++ b/include/exec/tb-stats-flags.h
@@ -35,6 +35,7 @@ enum TBStatsStatus {
#define TB_EXEC_STATS (1 << 1)
#define TB_JIT_STATS (1 << 2)
#define TB_JIT_TIME (1 << 3)
+#define TB_PAUSED (1 << 4)
extern int tcg_collect_tb_stats;
extern uint32_t default_tbstats_flag;
diff --git a/include/exec/tb-stats.h b/include/exec/tb-stats.h
index 6a53bef31b..65063c52d7 100644
--- a/include/exec/tb-stats.h
+++ b/include/exec/tb-stats.h
@@ -32,6 +32,9 @@
#include "exec/tb-stats-flags.h"
+enum SortBy { SORT_BY_HOTNESS, SORT_BY_HG /* Host/Guest */, SORT_BY_SPILLS };
+enum TbstatsCmd { START, PAUSE, STOP, FILTER };
+
#define tb_stats_enabled(tb, JIT_STATS) \
(tb && tb->tb_stats && (tb->tb_stats->stats_enabled & JIT_STATS))
@@ -105,6 +108,13 @@ void init_tb_stats_htable_if_not(void);
void dump_jit_profile_info(TCGProfile *s);
+struct TbstatsCommand {
+ enum TbstatsCmd cmd;
+ uint32_t level;
+};
+
+void do_hmp_tbstats_safe(CPUState *cpu, run_on_cpu_data icmd);
+
/* TBStatistic collection controls */
void enable_collect_tb_stats(void);
void disable_collect_tb_stats(void);
@@ -112,6 +122,7 @@ void pause_collect_tb_stats(void);
bool tb_stats_collection_enabled(void);
bool tb_stats_collection_paused(void);
+void set_default_tbstats_flag(uint32_t flag);
uint32_t get_default_tbstats_flag(void);
#endif
diff --git a/monitor/misc.c b/monitor/misc.c
index ac4ff58d96..b389ca09a1 100644
--- a/monitor/misc.c
+++ b/monitor/misc.c
@@ -459,6 +459,49 @@ static void hmp_info_registers(Monitor *mon, const QDict
*qdict)
}
#ifdef CONFIG_TCG
+static void hmp_tbstats(Monitor *mon, const QDict *qdict)
+{
+ if (!tcg_enabled()) {
+ error_report("TB information is only available with accel=tcg");
+ return;
+ }
+
+ char *cmd = (char *) qdict_get_try_str(qdict, "command");
+ enum TbstatsCmd icmd = -1;
+
+ if (strcmp(cmd, "start") == 0) {
+ icmd = START;
+ } else if (strcmp(cmd, "pause") == 0) {
+ icmd = PAUSE;
+ } else if (strcmp(cmd, "stop") == 0) {
+ icmd = STOP;
+ } else if (strcmp(cmd, "filter") == 0) {
+ icmd = FILTER;
+ } else {
+ error_report("invalid command!");
+ return;
+ }
+
+ char *slevel = (char *) qdict_get_try_str(qdict, "level");
+ uint32_t level = TB_EXEC_STATS | TB_JIT_STATS | TB_JIT_TIME;
+ if (slevel) {
+ if (strcmp(slevel, "jit") == 0) {
+ level = TB_JIT_STATS;
+ } else if (strcmp(slevel, "exec") == 0) {
+ level = TB_EXEC_STATS;
+ } else if (strcmp(slevel, "time") == 0) {
+ level = TB_JIT_TIME;
+ }
+ }
+
+ struct TbstatsCommand *tbscommand = g_new0(struct TbstatsCommand, 1);
+ tbscommand->cmd = icmd;
+ tbscommand->level = level;
+ async_safe_run_on_cpu(first_cpu, do_hmp_tbstats_safe,
+ RUN_ON_CPU_HOST_PTR(tbscommand));
+
+}
+
static void hmp_info_jit(Monitor *mon, const QDict *qdict)
{
if (!tcg_enabled()) {
@@ -1089,8 +1132,12 @@ static void hmp_info_mtree(Monitor *mon, const QDict
*qdict)
static void hmp_info_profile(Monitor *mon, const QDict *qdict)
{
+#ifdef CONFIG_TCG
dump_jit_exec_time_info(dev_time);
dev_time = 0;
+#else
+ error_report("TCG should be enabled!");
+#endif
}
/* Capture support */
diff --git a/vl.c b/vl.c
index 4203cc728c..dcb30eea8a 100644
--- a/vl.c
+++ b/vl.c
@@ -1796,11 +1796,17 @@ static bool main_loop_should_exit(void)
static void main_loop(void)
{
+#ifdef CONFIG_TCG
uint64_t ti;
+#endif
while (!main_loop_should_exit()) {
+#ifdef CONFIG_TCG
ti = profile_getclock();
+#endif
main_loop_wait(false);
+#ifdef CONFIG_TCG
dev_time += profile_getclock() - ti;
+#endif
}
}
--
2.22.0
