* vandersonmr (vanderson...@gmail.com) wrote: > 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. > > Signed-off-by: Vanderson M. do Rosario <vanderson...@gmail.com>
For HMP: Acked-by: Dr. David Alan Gilbert <dgilb...@redhat.com> > --- > accel/tcg/tb-stats.c | 111 ++++++++++++++++++++++++++++++++++++++++ > hmp-commands.hx | 17 ++++++ > include/exec/tb-stats.h | 12 +++++ > include/qemu-common.h | 1 + > monitor/misc.c | 49 ++++++++++++++++++ > vl.c | 6 +++ > 6 files changed, 196 insertions(+) > > diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c > index dddb9d4537..f28fd7b434 100644 > --- a/accel/tcg/tb-stats.c > +++ b/accel/tcg/tb-stats.c > @@ -9,6 +9,9 @@ > > #include "exec/tb-stats.h" > > +/* only accessed in safe work */ > +static GList *last_search; > + > uint64_t dev_time; > > struct jit_profile_info { > @@ -140,6 +143,96 @@ 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) > { > @@ -175,6 +268,24 @@ 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 bfa5681dd2..419898751e 100644 > --- a/hmp-commands.hx > +++ b/hmp-commands.hx > @@ -1885,6 +1885,23 @@ 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.h b/include/exec/tb-stats.h > index c0948e606a..9271b90924 100644 > --- a/include/exec/tb-stats.h > +++ b/include/exec/tb-stats.h > @@ -6,6 +6,9 @@ > #include "exec/tb-context.h" > #include "tcg.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)) > > @@ -74,10 +77,18 @@ bool tb_stats_cmp(const void *ap, const void *bp); > > void dump_jit_exec_time_info(uint64_t dev_time); > > +void set_tbstats_flags(uint32_t flags); > 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); > @@ -85,6 +96,7 @@ 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/include/qemu-common.h b/include/qemu-common.h > index 362e48c445..ab736a1b05 100644 > --- a/include/qemu-common.h > +++ b/include/qemu-common.h > @@ -141,6 +141,7 @@ enum TBStatsStatus { > #define TB_EXEC_STATS 1 > #define TB_JIT_STATS 2 > #define TB_JIT_TIME 4 > +#define TB_PAUSED 8 > > extern int tcg_collect_tb_stats; > extern uint32_t default_tbstats_flag; > diff --git a/monitor/misc.c b/monitor/misc.c > index 4839d6875f..6902e8addb 100644 > --- a/monitor/misc.c > +++ b/monitor/misc.c > @@ -74,6 +74,8 @@ > #include "sysemu/cpus.h" > #include "qemu/cutils.h" > #include "tcg/tcg.h" > +#include "exec/tb-stats.h" > +#include "qemu-common.h" > > #if defined(TARGET_S390X) > #include "hw/s390x/storage-keys.h" > @@ -459,6 +461,49 @@ 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 +1134,12 @@ 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 ef7737a7bc..326090c36a 100644 > --- a/vl.c > +++ b/vl.c > @@ -1781,11 +1781,17 @@ 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 > -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK