| Message ID | 20230530083526.2174430-7-fei2.wu@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | TCG code quality tracking | expand |
On 5/30/23 01:35, Fei Wu wrote: > From: "Vanderson M. do Rosario" <vandersonmr2@gmail.com> > > 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 <dgilbert@redhat.com> > Signed-off-by: Vanderson M. do Rosario <vandersonmr2@gmail.com> > Message-Id: <20190829173437.5926-8-vandersonmr2@gmail.com> > Message-Id: <20190829173437.5926-9-vandersonmr2@gmail.com> > [AJB: fix authorship] > Signed-off-by: Alex Bennée <alex.bennee@linaro.org> > Signed-off-by: Fei Wu <fei2.wu@intel.com> > --- I still don't see what pause does. > diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c > index 68ac7d3f73..805e1fc74d 100644 > --- a/accel/tcg/tb-stats.c > +++ b/accel/tcg/tb-stats.c > @@ -16,18 +16,20 @@ > #include "qemu/timer.h" > > #include "exec/tb-stats.h" > +#include "exec/tb-flush.h" > #include "tb-context.h" > > /* TBStatistic collection controls */ > enum TBStatsStatus { > TB_STATS_DISABLED = 0, > TB_STATS_RUNNING, > - TB_STATS_PAUSED, > - TB_STATS_STOPPED > + TB_STATS_PAUSED > }; Why? > > static enum TBStatsStatus tcg_collect_tb_stats; > static uint32_t default_tbstats_flag; > +/* only accessed in safe work */ > +static GList *last_search; > > uint64_t dev_time; > > @@ -170,6 +172,101 @@ void dump_jit_profile_info(TCGProfile *s, GString *buf) > 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_enabled()) { > + qemu_printf("TB information already being recorded"); > + return; > + } else if (tb_stats_collection_paused()) { > + set_tbstats_flags(level); > + } else { > + 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_disabled()) { > + 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); > +} Why isn't all of this in monitor.c? It's not used or usable from user-only mode. > +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); > +} Again, I question why a global variable is not more appropriate. r~
On 6/1/2023 9:23 AM, Richard Henderson wrote: > On 5/30/23 01:35, Fei Wu wrote: >> From: "Vanderson M. do Rosario" <vandersonmr2@gmail.com> >> >> 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 <dgilbert@redhat.com> >> Signed-off-by: Vanderson M. do Rosario <vandersonmr2@gmail.com> >> Message-Id: <20190829173437.5926-8-vandersonmr2@gmail.com> >> Message-Id: <20190829173437.5926-9-vandersonmr2@gmail.com> >> [AJB: fix authorship] >> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> >> Signed-off-by: Fei Wu <fei2.wu@intel.com> >> --- > > > I still don't see what pause does. > maybe it's necessary to discuss the user scenario, I suppose the original design is for this case: * start * pause - there are some interesting stats we want to keep * not interested timeline * start again - continue to investigate the interesting ones >> diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c >> index 68ac7d3f73..805e1fc74d 100644 >> --- a/accel/tcg/tb-stats.c >> +++ b/accel/tcg/tb-stats.c >> @@ -16,18 +16,20 @@ >> #include "qemu/timer.h" >> #include "exec/tb-stats.h" >> +#include "exec/tb-flush.h" >> #include "tb-context.h" >> /* TBStatistic collection controls */ >> enum TBStatsStatus { >> TB_STATS_DISABLED = 0, >> TB_STATS_RUNNING, >> - TB_STATS_PAUSED, >> - TB_STATS_STOPPED >> + TB_STATS_PAUSED >> }; > > Why? > STOPPED is the same as DISABLED. >> static enum TBStatsStatus tcg_collect_tb_stats; >> static uint32_t default_tbstats_flag; >> +/* only accessed in safe work */ >> +static GList *last_search; >> uint64_t dev_time; >> @@ -170,6 +172,101 @@ void dump_jit_profile_info(TCGProfile *s, >> GString *buf) >> 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_enabled()) { >> + qemu_printf("TB information already being recorded"); >> + return; >> + } else if (tb_stats_collection_paused()) { >> + set_tbstats_flags(level); >> + } else { >> + 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_disabled()) { >> + 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); >> +} > > Why isn't all of this in monitor.c? > It's not used or usable from user-only mode. > closer to tb-stats, or closer to monitor? It seems to me monitor.c only contains the shim layer of qmp/hmp, the real stuffs which are large enough are put together with their logic part, e.g. dump_exec_info(). Thanks, Fei. >> +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); >> +} > > Again, I question why a global variable is not more appropriate. > > > r~
On 6/1/23 00:20, Wu, Fei wrote: > On 6/1/2023 9:23 AM, Richard Henderson wrote: >> On 5/30/23 01:35, Fei Wu wrote: >>> From: "Vanderson M. do Rosario" <vandersonmr2@gmail.com> >>> >>> 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 <dgilbert@redhat.com> >>> Signed-off-by: Vanderson M. do Rosario <vandersonmr2@gmail.com> >>> Message-Id: <20190829173437.5926-8-vandersonmr2@gmail.com> >>> Message-Id: <20190829173437.5926-9-vandersonmr2@gmail.com> >>> [AJB: fix authorship] >>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> >>> Signed-off-by: Fei Wu <fei2.wu@intel.com> >>> --- >> >> >> I still don't see what pause does. >> > maybe it's necessary to discuss the user scenario, I suppose the > original design is for this case: > * start > * pause - there are some interesting stats we want to keep > * not interested timeline > * start again - continue to investigate the interesting ones This use case seems very complicated. Perhaps start with something simpler. >>> enum TBStatsStatus { >>> TB_STATS_DISABLED = 0, >>> TB_STATS_RUNNING, >>> - TB_STATS_PAUSED, >>> - TB_STATS_STOPPED >>> + TB_STATS_PAUSED >>> }; >> >> Why? >> > STOPPED is the same as DISABLED. Then this should be squashed back to patch 2, so that it is never added. >> Why isn't all of this in monitor.c? >> It's not used or usable from user-only mode. >> > closer to tb-stats, or closer to monitor? It seems to me monitor.c only > contains the shim layer of qmp/hmp, the real stuffs which are large > enough are put together with their logic part, e.g. dump_exec_info(). I mean accel/tcg/monitor.c, which is built only when there exists a monitor. r~
diff --git a/accel/tcg/monitor.c b/accel/tcg/monitor.c index 2bc87f2642..2e00f10267 100644 --- a/accel/tcg/monitor.c +++ b/accel/tcg/monitor.c @@ -11,7 +11,9 @@ #include "qapi/error.h" #include "qapi/type-helpers.h" #include "qapi/qapi-commands-machine.h" +#include "qapi/qmp/qdict.h" #include "monitor/monitor.h" +#include "monitor/hmp.h" #include "sysemu/cpus.h" #include "sysemu/cpu-timers.h" #include "sysemu/tcg.h" @@ -87,6 +89,49 @@ HumanReadableText *qmp_x_query_opcount(Error **errp) } #ifdef CONFIG_TCG +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)); + +} + HumanReadableText *qmp_x_query_profile(Error **errp) { g_autoptr(GString) buf = g_string_new(""); diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c index 68ac7d3f73..805e1fc74d 100644 --- a/accel/tcg/tb-stats.c +++ b/accel/tcg/tb-stats.c @@ -16,18 +16,20 @@ #include "qemu/timer.h" #include "exec/tb-stats.h" +#include "exec/tb-flush.h" #include "tb-context.h" /* TBStatistic collection controls */ enum TBStatsStatus { TB_STATS_DISABLED = 0, TB_STATS_RUNNING, - TB_STATS_PAUSED, - TB_STATS_STOPPED + TB_STATS_PAUSED }; static enum TBStatsStatus tcg_collect_tb_stats; static uint32_t default_tbstats_flag; +/* only accessed in safe work */ +static GList *last_search; uint64_t dev_time; @@ -170,6 +172,101 @@ void dump_jit_profile_info(TCGProfile *s, GString *buf) 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_enabled()) { + qemu_printf("TB information already being recorded"); + return; + } else if (tb_stats_collection_paused()) { + set_tbstats_flags(level); + } else { + 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_disabled()) { + 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(void) { if (!tb_ctx.tb_stats.map && tb_stats_collection_enabled()) { @@ -186,7 +283,7 @@ void enable_collect_tb_stats(void) void disable_collect_tb_stats(void) { - tcg_collect_tb_stats = TB_STATS_STOPPED; + tcg_collect_tb_stats = TB_STATS_DISABLED; } void pause_collect_tb_stats(void) @@ -199,11 +296,29 @@ bool tb_stats_collection_enabled(void) return tcg_collect_tb_stats == TB_STATS_RUNNING; } +bool tb_stats_collection_disabled(void) +{ + return tcg_collect_tb_stats == TB_STATS_DISABLED; +} + 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_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 2cbd0f77a0..9a40215d34 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -1670,6 +1670,22 @@ SRST Executes a qemu-io command on the given block device. ERST +#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 + +SRST +``tb_stats`` *command* *stats_level* + Control recording tb statistics +ERST + { .name = "qom-list", .args_type = "path:s?", diff --git a/include/exec/tb-stats-flags.h b/include/exec/tb-stats-flags.h index 04adaee8d9..a3897c99b1 100644 --- a/include/exec/tb-stats-flags.h +++ b/include/exec/tb-stats-flags.h @@ -16,12 +16,14 @@ #define TB_JIT_STATS (1 << 2) #define TB_JIT_TIME (1 << 3) #define TB_ALL_STATS (TB_EXEC_STATS | TB_JIT_STATS | TB_JIT_TIME) +#define TB_PAUSED (1 << 4) /* TBStatistic collection controls */ void enable_collect_tb_stats(void); void disable_collect_tb_stats(void); void pause_collect_tb_stats(void); bool tb_stats_collection_enabled(void); +bool tb_stats_collection_disabled(void); bool tb_stats_collection_paused(void); uint32_t get_default_tbstats_flag(void); diff --git a/include/exec/tb-stats.h b/include/exec/tb-stats.h index 72585c448a..4bb343870b 100644 --- a/include/exec/tb-stats.h +++ b/include/exec/tb-stats.h @@ -33,6 +33,9 @@ #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)) @@ -114,4 +117,11 @@ void init_tb_stats_htable(void); void dump_jit_profile_info(TCGProfile *s, GString *buf); void dump_jit_exec_time_info(uint64_t dev_time, GString *buf); +struct TbstatsCommand { + enum TbstatsCmd cmd; + uint32_t level; +}; + +void do_hmp_tbstats_safe(CPUState *cpu, run_on_cpu_data icmd); + #endif diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h index 13f9a2dedb..2e7f141754 100644 --- a/include/monitor/hmp.h +++ b/include/monitor/hmp.h @@ -181,5 +181,6 @@ void hmp_ioport_write(Monitor *mon, const QDict *qdict); void hmp_boot_set(Monitor *mon, const QDict *qdict); void hmp_info_mtree(Monitor *mon, const QDict *qdict); void hmp_info_cryptodev(Monitor *mon, const QDict *qdict); +void hmp_tbstats(Monitor *mon, const QDict *qdict); #endif