| Message ID | 20230421132421.1617479-13-fei2.wu@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | TCG code quality tracking | expand |
On 4/21/2023 9:24 PM, Fei Wu wrote: > From: "Vanderson M. do Rosario" <vandersonmr2@gmail.com> > > These commands allow the exploration of TBs generated by the TCG. > Understand which one hotter, with more guest/host instructions... and > examine their guest, host and IR code. > > The goal of this command is to allow the dynamic exploration of TCG > behavior and code quality. Therefore, for now, a corresponding QMP > command is not worthwhile. > > [AJB: WIP - we still can't be safely sure a translation will succeed] > > Example of output: > > TB id:1 | phys:0x34d54 virt:0x0000000000034d54 flags:0x0000f0 > | exec:4828932/0 guest inst cov:16.38% > | trans:1 ints: g:3 op:82 op_opt:34 spills:3 > | h/g (host bytes / guest insts): 90.666664 > | time to gen at 2.4GHz => code:3150.83(ns) IR:712.08(ns) > | targets: 0x0000000000034d5e (id:11), 0x0000000000034d0d (id:2) > > TB id:2 | phys:0x34d0d virt:0x0000000000034d0d flags:0x0000f0 > | exec:4825842/0 guest inst cov:21.82% > | trans:1 ints: g:4 op:80 op_opt:38 spills:2 > | h/g (host bytes / guest insts): 84.000000 > | time to gen at 2.4GHz => code:3362.92(ns) IR:793.75(ns) > | targets: 0x0000000000034d19 (id:12), 0x0000000000034d54 (id:1) > > TB id:2 | phys:0x34d0d virt:0x0000000000034d0d flags:0x0000f0 > | exec:6956495/0 guest inst cov:21.82% > | trans:2 ints: g:2 op:40 op_opt:19 spills:1 > | h/g (host bytes / guest insts): 84.000000 > | time to gen at 2.4GHz => code:3130.83(ns) IR:722.50(ns) > | targets: 0x0000000000034d19 (id:12), 0x0000000000034d54 (id:1) > > ---------------- > IN: > 0x00034d0d: 89 de movl %ebx, %esi > 0x00034d0f: 26 8b 0e movl %es:(%esi), %ecx > 0x00034d12: 26 f6 46 08 80 testb $0x80, %es:8(%esi) > 0x00034d17: 75 3b jne 0x34d54 > > ------------------------------ > > TB id:1 | phys:0x34d54 virt:0x0000000000034d54 flags:0x0000f0 > | exec:5202686/0 guest inst cov:11.28% > | trans:1 ints: g:3 op:82 op_opt:34 spills:3 > | h/g (host bytes / guest insts): 90.666664 > | time to gen at 2.4GHz => code:2793.75(ns) IR:614.58(ns) > | targets: 0x0000000000034d5e (id:3), 0x0000000000034d0d (id:2) > > TB id:2 | phys:0x34d0d virt:0x0000000000034d0d flags:0x0000f0 > | exec:5199468/0 guest inst cov:15.03% > | trans:1 ints: g:4 op:80 op_opt:38 spills:2 > | h/g (host bytes / guest insts): 84.000000 > | time to gen at 2.4GHz => code:2958.75(ns) IR:719.58(ns) > | targets: 0x0000000000034d19 (id:4), 0x0000000000034d54 (id:1) > > ------------------------------ > 2 TBs to reach 25% of guest inst exec coverage > Total of guest insts exec: 138346727 > > ------------------------------ > > Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com> > Signed-off-by: Vanderson M. do Rosario <vandersonmr2@gmail.com> > Message-Id: <20190829173437.5926-10-vandersonmr2@gmail.com> > [AJB: fix authorship, dropped coverset] > Signed-off-by: Alex Bennée <alex.bennee@linaro.org> > --- > accel/tcg/monitor.c | 55 ++++++ > accel/tcg/tb-stats.c | 322 +++++++++++++++++++++++++++++++++++ > disas.c | 31 +++- > hmp-commands-info.hx | 16 ++ > include/exec/tb-stats.h | 33 +++- > include/monitor/hmp.h | 2 + > include/qemu/log-for-trace.h | 6 +- > include/qemu/log.h | 2 + > util/log.c | 66 +++++-- > 9 files changed, 512 insertions(+), 21 deletions(-) > > diff --git a/accel/tcg/monitor.c b/accel/tcg/monitor.c > index b342727262..6bfefd24f6 100644 > --- a/accel/tcg/monitor.c > +++ b/accel/tcg/monitor.c > @@ -7,6 +7,7 @@ > */ > > #include "qemu/osdep.h" > +#include "qemu/log.h" > #include "qapi/error.h" > #include "qapi/type-helpers.h" > #include "qapi/qapi-commands-machine.h" > @@ -17,6 +18,7 @@ > #include "sysemu/cpu-timers.h" > #include "sysemu/tcg.h" > #include "exec/tb-stats.h" > +#include "tb-context.h" > #include "internal.h" > > > @@ -117,6 +119,59 @@ void hmp_tbstats(Monitor *mon, const QDict *qdict) > RUN_ON_CPU_HOST_PTR(tbscommand)); > > } > + > +void hmp_info_tblist(Monitor *mon, const QDict *qdict) > +{ > + int number_int; > + const char *sortedby_str = NULL; > + if (!tcg_enabled()) { > + error_report("TB information is only available with accel=tcg"); > + return; > + } > + if (!tb_ctx.tb_stats.map) { > + error_report("no TB information recorded"); > + return; > + } > + > + number_int = qdict_get_try_int(qdict, "number", 10); > + sortedby_str = qdict_get_try_str(qdict, "sortedby"); > + > + int sortedby = SORT_BY_HOTNESS; > + if (sortedby_str == NULL || strcmp(sortedby_str, "hotness") == 0) { > + sortedby = SORT_BY_HOTNESS; > + } else if (strcmp(sortedby_str, "hg") == 0) { > + sortedby = SORT_BY_HG; > + } else if (strcmp(sortedby_str, "spills") == 0) { > + sortedby = SORT_BY_SPILLS; > + } else { > + error_report("valid sort options are: hotness hg spills"); > + return; > + } > + > + dump_tbs_info(number_int, sortedby, true); > +} > + > +void hmp_info_tb(Monitor *mon, const QDict *qdict) > +{ > + const int id = qdict_get_int(qdict, "id"); > + const char *flags = qdict_get_try_str(qdict, "flags"); > + int mask; > + > + if (!tcg_enabled()) { > + error_report("TB information is only available with accel=tcg"); > + return; > + } > + > + mask = flags ? qemu_str_to_log_mask(flags) : CPU_LOG_TB_IN_ASM; > + > + if (!mask) { > + error_report("Unable to parse log flags, see 'help log'"); > + return; > + } > + > + dump_tb_info(id, mask, true); > +} > + > #endif > > HumanReadableText *qmp_x_query_profile(Error **errp) > diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c > index 56e944b225..69ac3d25cf 100644 > --- a/accel/tcg/tb-stats.c > +++ b/accel/tcg/tb-stats.c > @@ -11,14 +11,18 @@ > #include "disas/disas.h" > #include "exec/exec-all.h" > #include "tcg/tcg.h" > +#include "qapi/error.h" > > #include "qemu/qemu-print.h" > #include "qemu/timer.h" > +#include "qemu/log.h" > > #include "exec/tb-stats.h" > #include "exec/tb-flush.h" > #include "tb-context.h" > > +#include "internal.h" > + > /* TBStatistic collection controls */ > enum TBStatsStatus { > TB_STATS_DISABLED = 0, > @@ -32,8 +36,23 @@ static uint32_t default_tbstats_flag; > /* only accessed in safe work */ > static GList *last_search; > > +static int id = 1; /* display_id increment counter */ > uint64_t dev_time; > > +static TBStatistics *get_tbstats_by_id(int id) > +{ > + GList *iter; > + > + for (iter = last_search; iter; iter = g_list_next(iter)) { > + TBStatistics *tbs = iter->data; > + if (tbs && tbs->display_id == id) { > + return tbs; > + break; > + } > + } > + return NULL; > +} > + > struct jit_profile_info { > uint64_t translations; > uint64_t aborted; > @@ -296,6 +315,309 @@ void init_tb_stats_htable(void) > } > } > > +static void collect_tb_stats(void *p, uint32_t hash, void *userp) > +{ > + last_search = g_list_prepend(last_search, p); > +} > + > +static void count_invalid_tbs(gpointer data, gpointer user_data) > +{ > + TranslationBlock *tb = (TranslationBlock *) data; > + unsigned *counter = (unsigned *) user_data; > + if (tb->cflags & CF_INVALID) { > + *counter = *counter + 1; > + } > +} > + > +static int dump_tb_header(TBStatistics *tbs) > +{ > + unsigned g = stat_per_translation(tbs, code.num_guest_inst); > + unsigned ops = stat_per_translation(tbs, code.num_tcg_ops); > + unsigned ops_opt = stat_per_translation(tbs, code.num_tcg_ops_opt); > + unsigned spills = stat_per_translation(tbs, code.spills); > + unsigned h = stat_per_translation(tbs, code.out_len); > + unsigned act = tbs->tbs->len; > + unsigned invalid = 0; > + > + float guest_host_prop = g ? ((float) h / g) : 0; > + > + g_ptr_array_foreach(tbs->tbs, &count_invalid_tbs, &invalid); > + > + qemu_log("TB id:%d | phys:0x"TB_PAGE_ADDR_FMT" virt:0x"TARGET_FMT_lx > + " flags:0x%08x %d inv/%d\n", > + tbs->display_id, tbs->phys_pc, tbs->pc, tbs->flags, > + invalid, act); > + > + if (tbs_stats_enabled(tbs, TB_EXEC_STATS)) { > + qemu_log("\t| exec:%lu/%lu guest inst cov:%.2f%%\n", > + tbs->executions.normal, > + tbs->executions.atomic, tbs->executions.coverage / 100.0f); > + } > + > + if (tbs_stats_enabled(tbs, TB_JIT_STATS)) { > + qemu_log("\t| trans:%lu ints: g:%u op:%u op_opt:%u spills:%d" > + "\n\t| h/g (host bytes / guest insts): %f\n", > + tbs->translations.total, g, ops, ops_opt, spills, guest_host_prop); > + } > + > + if (tbs_stats_enabled(tbs, TB_JIT_TIME)) { > + qemu_log("\t| time to gen at 2.4GHz => code:%0.2lf(ns) IR:%0.2lf(ns)\n", > + tbs->gen_times.code / 2.4, tbs->gen_times.ir / 2.4); > + } > + > + qemu_log("\n"); > + > + return act - invalid; > +} > + > +static gint > +inverse_sort_tbs(gconstpointer p1, gconstpointer p2, gpointer psort_by) > +{ > + const TBStatistics *tbs1 = (TBStatistics *) p1; > + const TBStatistics *tbs2 = (TBStatistics *) p2; > + int sort_by = *((enum SortBy *) psort_by); > + unsigned long c1 = 0; > + unsigned long c2 = 0; > + > + if (sort_by == SORT_BY_SPILLS) { > + c1 = stat_per_translation(tbs1, code.spills); > + c2 = stat_per_translation(tbs2, code.spills); > + } else if (sort_by == SORT_BY_HOTNESS) { > + c1 = stat_per_translation(tbs1, executions.normal); > + c2 = stat_per_translation(tbs2, executions.normal); > + } else if (sort_by == SORT_BY_HG) { > + if (tbs1->code.num_guest_inst == 0) { > + return -1; > + } > + if (tbs2->code.num_guest_inst == 0) { > + return 1; > + } > + > + c1 = tbs1->code.out_len / tbs1->code.num_guest_inst; > + c2 = tbs2->code.out_len / tbs2->code.num_guest_inst; > + } > + return c2 - c1; I take the type as int for granted, will fix it. Thanks, Fei. > +} > + > +static void dump_last_search_headers(int count) > +{ > + if (!last_search) { > + qemu_log("No data collected yet\n"); > + return; > + } > + > + GList *l = last_search; > + while (l != NULL && count--) { > + TBStatistics *tbs = (TBStatistics *) l->data; > + GList *next = l->next; > + dump_tb_header(tbs); > + l = next; > + } > +} > + > +static uint64_t calculate_last_search_coverages(void) > +{ > + uint64_t total_exec_count = 0; > + GList *i; > + > + /* Compute total execution count for all tbs */ > + for (i = last_search; i; i = i->next) { > + TBStatistics *tbs = (TBStatistics *) i->data; > + total_exec_count += > + (tbs->executions.atomic + tbs->executions.normal) > + * tbs->code.num_guest_inst; > + } > + > + for (i = last_search; i; i = i->next) { > + TBStatistics *tbs = (TBStatistics *) i->data; > + uint64_t tb_total_execs = > + (tbs->executions.atomic + tbs->executions.normal) > + * tbs->code.num_guest_inst; > + tbs->executions.coverage = > + (10000 * tb_total_execs) / (total_exec_count + 1); > + } > + > + return total_exec_count; > +} > + > +static void do_dump_tbs_info(int total, int sort_by) > +{ > + id = 1; > + GList *i; > + int count = total; > + > + g_list_free(last_search); > + last_search = NULL; > + > + qht_iter(&tb_ctx.tb_stats, collect_tb_stats, NULL); > + > + last_search = g_list_sort_with_data(last_search, inverse_sort_tbs, > + &sort_by); > + > + if (!last_search) { > + qemu_printf("No data collected yet!\n"); > + return; > + } > + > + calculate_last_search_coverages(); > + > + for (i = last_search; i && count--; i = i->next) { > + TBStatistics *tbs = (TBStatistics *) i->data; > + tbs->display_id = id++; > + } > + > + /* free the unused bits */ > + if (i) { > + if (i->next) { > + i->next->prev = NULL; > + } > + g_list_free(i->next); > + i->next = NULL; > + } > + > + dump_last_search_headers(total); > +} > + > +struct tbs_dump_info { > + int count; > + int sort_by; > +}; > + > +static void do_dump_tbs_info_safe(CPUState *cpu, run_on_cpu_data tbdi) > +{ > + struct tbs_dump_info *info = tbdi.host_ptr; > + qemu_log_to_monitor(true); > + do_dump_tbs_info(info->count, info->sort_by); > + qemu_log_to_monitor(false); > + g_free(info); > +} > + > +/* > + * When we dump_tbs_info on a live system via the HMP we want to > + * ensure the system is quiessent before we start outputting stuff. > + * Otherwise we could pollute the output with other logging output. > + */ > + > +void dump_tbs_info(int count, int sort_by, bool use_monitor) > +{ > + if (use_monitor) { > + struct tbs_dump_info *tbdi = g_new(struct tbs_dump_info, 1); > + tbdi->count = count; > + tbdi->sort_by = sort_by; > + async_safe_run_on_cpu(first_cpu, do_dump_tbs_info_safe, > + RUN_ON_CPU_HOST_PTR(tbdi)); > + } else { > + do_dump_tbs_info(count, sort_by); > + } > +} > + > +/* > + * We cannot always re-generate the code even if we know there are > + * valid translations still in the cache. The reason being the guest > + * may have un-mapped the page code. In real life this would be > + * un-reachable as the jump cache is cleared and the following QHT > + * lookup will do a get_page_addr_code() and fault. > + * > + * TODO: can we do this safely? We need to > + * a) somehow recover the mmu_idx for this translation > + * b) probe MMU_INST_FETCH to know it will succeed > + */ > +static GString *get_code_string(TBStatistics *tbs, int log_flags) > +{ > + int old_log_flags = qemu_loglevel; > + > + CPUState *cpu = first_cpu; > + uint32_t cflags = curr_cflags(cpu); > + TranslationBlock *tb = NULL; > + > + GString *code_s = g_string_new(NULL); > + qemu_log_to_string(true, code_s); > + > + Error *err = NULL; > + if (!qemu_set_log(log_flags, &err)) { > + g_string_append_printf(code_s, "%s", error_get_pretty(err)); > + error_free(err); > + } > + > + if (sigsetjmp(cpu->jmp_env, 0) == 0) { > + mmap_lock(); > + tb = tb_gen_code(cpu, tbs->pc, tbs->cs_base, tbs->flags, cflags); > + tb_phys_invalidate(tb, -1); > + mmap_unlock(); > + } else { > + /* > + * The mmap_lock is dropped by tb_gen_code if it runs out of > + * memory. > + */ > + qemu_log("\ncould not gen code for this TB (no longer mapped?)\n"); > + assert_no_pages_locked(); > + } > + > + qemu_set_log(old_log_flags, &err); > + qemu_log_to_string(false, NULL); > + > + return code_s; > +} > + > +static void do_tb_dump_with_statistics(TBStatistics *tbs, int log_flags) > +{ > + g_autoptr(GString) code_s = NULL; > + > + qemu_log("\n------------------------------\n\n"); > + > + if (dump_tb_header(tbs) > 0) { > + code_s = get_code_string(tbs, log_flags); > + } else { > + code_s = g_string_new("cannot re-translate non-active translation"); > + } > + qemu_log("%s", code_s->str); > + qemu_log("------------------------------\n"); > +} > + > +struct tb_dump_info { > + int id; > + int log_flags; > + bool use_monitor; > +}; > + > +static void do_dump_tb_info_safe(CPUState *cpu, run_on_cpu_data info) > +{ > + struct tb_dump_info *tbdi = (struct tb_dump_info *) info.host_ptr; > + > + if (!last_search) { > + qemu_log("no search on record\n"); > + return; > + } > + > + qemu_log_to_monitor(tbdi->use_monitor); > + > + TBStatistics *tbs = get_tbstats_by_id(tbdi->id); > + if (tbs) { > + do_tb_dump_with_statistics(tbs, tbdi->log_flags); > + } else { > + qemu_log("no TB statitics found with id %d\n", tbdi->id); > + } > + > + qemu_log_to_monitor(false); > + > + g_free(tbdi); > +} > + > +void dump_tb_info(int id, int log_mask, bool use_monitor) > +{ > + struct tb_dump_info *tbdi = g_new(struct tb_dump_info, 1); > + > + tbdi->id = id; > + tbdi->log_flags = log_mask; > + tbdi->use_monitor = use_monitor; > + > + async_safe_run_on_cpu(first_cpu, do_dump_tb_info_safe, > + RUN_ON_CPU_HOST_PTR(tbdi)); > + > + /* tbdi free'd by do_dump_tb_info_safe */ > +} > + > + > void enable_collect_tb_stats(void) > { > tcg_collect_tb_stats = TB_STATS_RUNNING; > diff --git a/disas.c b/disas.c > index b087c12c47..326d1a5208 100644 > --- a/disas.c > +++ b/disas.c > @@ -7,6 +7,8 @@ > #include "disas/disas.h" > #include "disas/capstone.h" > > +#include "qemu/log-for-trace.h" > + > typedef struct CPUDebug { > struct disassemble_info info; > CPUState *cpu; > @@ -203,6 +205,24 @@ static void initialize_debug_host(CPUDebug *s) > #endif > } > > +static int > +__attribute__((format(printf, 2, 3))) > +fprintf_log(struct _IO_FILE *a, const char *b, ...) > +{ > + va_list ap; > + va_start(ap, b); > + > + if (!to_string) { > + vfprintf(a, b, ap); > + } else { > + qemu_vlog(b, ap); > + } > + > + va_end(ap); > + > + return 1; > +} > + > /* Disassemble this for me please... (debugging). */ > void target_disas(FILE *out, CPUState *cpu, target_ulong code, > target_ulong size) > @@ -226,11 +246,12 @@ void target_disas(FILE *out, CPUState *cpu, target_ulong code, > } > > for (pc = code; size > 0; pc += count, size -= count) { > - fprintf(out, "0x" TARGET_FMT_lx ": ", pc); > - count = s.info.print_insn(pc, &s.info); > - fprintf(out, "\n"); > - if (count < 0) > - break; > + fprintf_log(out, "0x" TARGET_FMT_lx ": ", pc); > + count = s.info.print_insn(pc, &s.info); > + fprintf_log(out, "\n"); > + if (count < 0) { > + break; > + } > if (size < count) { > fprintf(out, > "Disassembler disagrees with translator over instruction " > diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx > index 47d63d26db..01d9658aea 100644 > --- a/hmp-commands-info.hx > +++ b/hmp-commands-info.hx > @@ -262,6 +262,22 @@ ERST > .params = "", > .help = "show dynamic compiler info", > }, > + { > + .name = "tb-list", > + .args_type = "number:i?,sortedby:s?", > + .params = "[number sortedby]", > + .help = "show a [number] translated blocks sorted by [sortedby]" > + "sortedby opts: hotness hg spills", > + .cmd = hmp_info_tblist, > + }, > + { > + .name = "tb", > + .args_type = "id:i,flags:s?", > + .params = "id [flag1,flag2,...]", > + .help = "show information about one translated block by id." > + "dump flags can be used to set dump code level: out_asm in_asm op", > + .cmd = hmp_info_tb, > + }, > #endif > > SRST > diff --git a/include/exec/tb-stats.h b/include/exec/tb-stats.h > index ec47cbecc2..3d2b167b0e 100644 > --- a/include/exec/tb-stats.h > +++ b/include/exec/tb-stats.h > @@ -35,8 +35,11 @@ > enum SortBy { SORT_BY_HOTNESS, SORT_BY_HG /* Host/Guest */, SORT_BY_SPILLS }; > enum TbstatsCmd { START, PAUSE, STOP, FILTER }; > > +#define tbs_stats_enabled(tbs, JIT_STATS) \ > + (tbs && (tbs->stats_enabled & JIT_STATS)) > + > #define tb_stats_enabled(tb, JIT_STATS) \ > - (tb && tb->tb_stats && (tb->tb_stats->stats_enabled & JIT_STATS)) > + (tb && tb->tb_stats && tbs_stats_enabled(tb->tb_stats, JIT_STATS)) > > #define stat_per_translation(stat, name) \ > (stat->translations.total ? stat->name / stat->translations.total : 0) > @@ -65,6 +68,8 @@ struct TBStatistics { > struct { > unsigned long normal; > unsigned long atomic; > + /* filled only when dumping x% cover set */ > + uint16_t coverage; > } executions; > > /* JIT Stats - protected by lock */ > @@ -87,7 +92,6 @@ struct TBStatistics { > > struct { > unsigned long total; > - unsigned long uncached; > unsigned long spanning; > } translations; > > @@ -107,6 +111,9 @@ struct TBStatistics { > uint64_t la; > uint64_t code; > } gen_times; > + > + /* HMP information - used for referring to previous search */ > + int display_id; > }; > > bool tb_stats_cmp(const void *ap, const void *bp); > @@ -133,4 +140,26 @@ void do_hmp_tbstats_safe(CPUState *cpu, run_on_cpu_data icmd); > */ > void tbstats_reset_tbs(void); > > +/** > + * dump_tbs_info: report the hottest blocks > + * > + * @count: the limit of hotblocks > + * @sort_by: property in which the dump will be sorted > + * @use_monitor: redirect output to monitor > + * > + * Report the hottest blocks to either the log or monitor > + */ > +void dump_tbs_info(int count, int sort_by, bool use_monitor); > + > +/** > + * dump_tb_info: dump information about one TB > + * > + * @id: the display id of the block (from previous search) > + * @mask: the temporary logging mask > + * @Use_monitor: redirect output to monitor > + * > + * Re-run a translation of a block at addr for the purposes of debug output > + */ > +void dump_tb_info(int id, int log_mask, bool use_monitor); > + > #endif > diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h > index 207ec19b34..69f3a75fef 100644 > --- a/include/monitor/hmp.h > +++ b/include/monitor/hmp.h > @@ -182,5 +182,7 @@ 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); > +void hmp_info_tblist(Monitor *mon, const QDict *qdict); > +void hmp_info_tb(Monitor *mon, const QDict *qdict); > > #endif > diff --git a/include/qemu/log-for-trace.h b/include/qemu/log-for-trace.h > index d47c9cd446..5d0afc56c7 100644 > --- a/include/qemu/log-for-trace.h > +++ b/include/qemu/log-for-trace.h > @@ -20,6 +20,9 @@ > > /* Private global variable, don't use */ > extern int qemu_loglevel; > +extern bool to_string; > + > +extern int32_t max_num_hot_tbs_to_dump; > > #define LOG_TRACE (1 << 15) > > @@ -30,6 +33,7 @@ static inline bool qemu_loglevel_mask(int mask) > } > > /* main logging function */ > -void G_GNUC_PRINTF(1, 2) qemu_log(const char *fmt, ...); > +int G_GNUC_PRINTF(1, 2) qemu_log(const char *fmt, ...); > +int G_GNUC_PRINTF(1, 0) qemu_vlog(const char *fmt, va_list va); > > #endif > diff --git a/include/qemu/log.h b/include/qemu/log.h > index 6f3b8091cd..26b33151f3 100644 > --- a/include/qemu/log.h > +++ b/include/qemu/log.h > @@ -85,6 +85,8 @@ extern const QEMULogItem qemu_log_items[]; > bool qemu_set_log(int log_flags, Error **errp); > bool qemu_set_log_filename(const char *filename, Error **errp); > bool qemu_set_log_filename_flags(const char *name, int flags, Error **errp); > +void qemu_log_to_monitor(bool enable); > +void qemu_log_to_string(bool enable, GString *s); > void qemu_set_dfilter_ranges(const char *ranges, Error **errp); > bool qemu_log_in_addr_range(uint64_t addr); > int qemu_str_to_log_mask(const char *str); > diff --git a/util/log.c b/util/log.c > index 7ae471d97c..6477eb5a5f 100644 > --- a/util/log.c > +++ b/util/log.c > @@ -50,6 +50,8 @@ int qemu_loglevel; > static bool log_per_thread; > static GArray *debug_regions; > int32_t max_num_hot_tbs_to_dump; > +static bool to_monitor; > +bool to_string; > > /* Returns true if qemu_log() will really write somewhere. */ > bool qemu_log_enabled(void) > @@ -146,19 +148,6 @@ void qemu_log_unlock(FILE *logfile) > } > } > > -void qemu_log(const char *fmt, ...) > -{ > - FILE *f = qemu_log_trylock(); > - if (f) { > - va_list ap; > - > - va_start(ap, fmt); > - vfprintf(f, fmt, ap); > - va_end(ap); > - qemu_log_unlock(f); > - } > -} > - > static void __attribute__((__constructor__)) startup(void) > { > qemu_mutex_init(&global_mutex); > @@ -206,6 +195,55 @@ valid_filename_template(const char *filename, bool per_thread, Error **errp) > return filename ? vft_strdup : vft_stderr; > } > > +GString *string; > + > +int qemu_vlog(const char *fmt, va_list va) > +{ > + int ret = 0; > + > + if (to_string && string) { > + g_string_append_vprintf(string, fmt, va); > + } else if (to_monitor) { > + ret = qemu_vprintf(fmt, va); > + } else { > + FILE *f = qemu_log_trylock(); > + if (f) { > + ret = vfprintf(f, fmt, va); > + } > + qemu_log_unlock(f); > + } > + > + /* Don't pass back error results. */ > + if (ret < 0) { > + ret = 0; > + } > + return ret; > +} > + > +/* Return the number of characters emitted. */ > +int qemu_log(const char *fmt, ...) > +{ > + int ret = 0; > + va_list ap; > + > + va_start(ap, fmt); > + ret = qemu_vlog(fmt, ap); > + va_end(ap); > + > + return ret; > +} > + > +void qemu_log_to_monitor(bool enable) > +{ > + to_monitor = enable; > +} > + > +void qemu_log_to_string(bool enable, GString *s) > +{ > + to_string = enable; > + string = s; > +} > + > /* enable or disable low levels log */ > static bool qemu_set_log_internal(const char *filename, bool changed_name, > int log_flags, Error **errp) > @@ -523,6 +561,7 @@ int qemu_str_to_log_mask(const char *str) > trace_enable_events((*tmp) + 6); > mask |= LOG_TRACE; > #endif > +#ifdef CONFIG_TCG > } else if (g_str_has_prefix(*tmp, "tb_stats")) { > mask |= CPU_LOG_TB_STATS; > set_default_tbstats_flag(TB_ALL_STATS); > @@ -553,6 +592,7 @@ int qemu_str_to_log_mask(const char *str) > } > set_default_tbstats_flag(flags); > } > +#endif > } else { > for (item = qemu_log_items; item->mask != 0; item++) { > if (g_str_equal(*tmp, item->name)) {
diff --git a/accel/tcg/monitor.c b/accel/tcg/monitor.c index b342727262..6bfefd24f6 100644 --- a/accel/tcg/monitor.c +++ b/accel/tcg/monitor.c @@ -7,6 +7,7 @@ */ #include "qemu/osdep.h" +#include "qemu/log.h" #include "qapi/error.h" #include "qapi/type-helpers.h" #include "qapi/qapi-commands-machine.h" @@ -17,6 +18,7 @@ #include "sysemu/cpu-timers.h" #include "sysemu/tcg.h" #include "exec/tb-stats.h" +#include "tb-context.h" #include "internal.h" @@ -117,6 +119,59 @@ void hmp_tbstats(Monitor *mon, const QDict *qdict) RUN_ON_CPU_HOST_PTR(tbscommand)); } + +void hmp_info_tblist(Monitor *mon, const QDict *qdict) +{ + int number_int; + const char *sortedby_str = NULL; + if (!tcg_enabled()) { + error_report("TB information is only available with accel=tcg"); + return; + } + if (!tb_ctx.tb_stats.map) { + error_report("no TB information recorded"); + return; + } + + number_int = qdict_get_try_int(qdict, "number", 10); + sortedby_str = qdict_get_try_str(qdict, "sortedby"); + + int sortedby = SORT_BY_HOTNESS; + if (sortedby_str == NULL || strcmp(sortedby_str, "hotness") == 0) { + sortedby = SORT_BY_HOTNESS; + } else if (strcmp(sortedby_str, "hg") == 0) { + sortedby = SORT_BY_HG; + } else if (strcmp(sortedby_str, "spills") == 0) { + sortedby = SORT_BY_SPILLS; + } else { + error_report("valid sort options are: hotness hg spills"); + return; + } + + dump_tbs_info(number_int, sortedby, true); +} + +void hmp_info_tb(Monitor *mon, const QDict *qdict) +{ + const int id = qdict_get_int(qdict, "id"); + const char *flags = qdict_get_try_str(qdict, "flags"); + int mask; + + if (!tcg_enabled()) { + error_report("TB information is only available with accel=tcg"); + return; + } + + mask = flags ? qemu_str_to_log_mask(flags) : CPU_LOG_TB_IN_ASM; + + if (!mask) { + error_report("Unable to parse log flags, see 'help log'"); + return; + } + + dump_tb_info(id, mask, true); +} + #endif HumanReadableText *qmp_x_query_profile(Error **errp) diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c index 56e944b225..69ac3d25cf 100644 --- a/accel/tcg/tb-stats.c +++ b/accel/tcg/tb-stats.c @@ -11,14 +11,18 @@ #include "disas/disas.h" #include "exec/exec-all.h" #include "tcg/tcg.h" +#include "qapi/error.h" #include "qemu/qemu-print.h" #include "qemu/timer.h" +#include "qemu/log.h" #include "exec/tb-stats.h" #include "exec/tb-flush.h" #include "tb-context.h" +#include "internal.h" + /* TBStatistic collection controls */ enum TBStatsStatus { TB_STATS_DISABLED = 0, @@ -32,8 +36,23 @@ static uint32_t default_tbstats_flag; /* only accessed in safe work */ static GList *last_search; +static int id = 1; /* display_id increment counter */ uint64_t dev_time; +static TBStatistics *get_tbstats_by_id(int id) +{ + GList *iter; + + for (iter = last_search; iter; iter = g_list_next(iter)) { + TBStatistics *tbs = iter->data; + if (tbs && tbs->display_id == id) { + return tbs; + break; + } + } + return NULL; +} + struct jit_profile_info { uint64_t translations; uint64_t aborted; @@ -296,6 +315,309 @@ void init_tb_stats_htable(void) } } +static void collect_tb_stats(void *p, uint32_t hash, void *userp) +{ + last_search = g_list_prepend(last_search, p); +} + +static void count_invalid_tbs(gpointer data, gpointer user_data) +{ + TranslationBlock *tb = (TranslationBlock *) data; + unsigned *counter = (unsigned *) user_data; + if (tb->cflags & CF_INVALID) { + *counter = *counter + 1; + } +} + +static int dump_tb_header(TBStatistics *tbs) +{ + unsigned g = stat_per_translation(tbs, code.num_guest_inst); + unsigned ops = stat_per_translation(tbs, code.num_tcg_ops); + unsigned ops_opt = stat_per_translation(tbs, code.num_tcg_ops_opt); + unsigned spills = stat_per_translation(tbs, code.spills); + unsigned h = stat_per_translation(tbs, code.out_len); + unsigned act = tbs->tbs->len; + unsigned invalid = 0; + + float guest_host_prop = g ? ((float) h / g) : 0; + + g_ptr_array_foreach(tbs->tbs, &count_invalid_tbs, &invalid); + + qemu_log("TB id:%d | phys:0x"TB_PAGE_ADDR_FMT" virt:0x"TARGET_FMT_lx + " flags:0x%08x %d inv/%d\n", + tbs->display_id, tbs->phys_pc, tbs->pc, tbs->flags, + invalid, act); + + if (tbs_stats_enabled(tbs, TB_EXEC_STATS)) { + qemu_log("\t| exec:%lu/%lu guest inst cov:%.2f%%\n", + tbs->executions.normal, + tbs->executions.atomic, tbs->executions.coverage / 100.0f); + } + + if (tbs_stats_enabled(tbs, TB_JIT_STATS)) { + qemu_log("\t| trans:%lu ints: g:%u op:%u op_opt:%u spills:%d" + "\n\t| h/g (host bytes / guest insts): %f\n", + tbs->translations.total, g, ops, ops_opt, spills, guest_host_prop); + } + + if (tbs_stats_enabled(tbs, TB_JIT_TIME)) { + qemu_log("\t| time to gen at 2.4GHz => code:%0.2lf(ns) IR:%0.2lf(ns)\n", + tbs->gen_times.code / 2.4, tbs->gen_times.ir / 2.4); + } + + qemu_log("\n"); + + return act - invalid; +} + +static gint +inverse_sort_tbs(gconstpointer p1, gconstpointer p2, gpointer psort_by) +{ + const TBStatistics *tbs1 = (TBStatistics *) p1; + const TBStatistics *tbs2 = (TBStatistics *) p2; + int sort_by = *((enum SortBy *) psort_by); + unsigned long c1 = 0; + unsigned long c2 = 0; + + if (sort_by == SORT_BY_SPILLS) { + c1 = stat_per_translation(tbs1, code.spills); + c2 = stat_per_translation(tbs2, code.spills); + } else if (sort_by == SORT_BY_HOTNESS) { + c1 = stat_per_translation(tbs1, executions.normal); + c2 = stat_per_translation(tbs2, executions.normal); + } else if (sort_by == SORT_BY_HG) { + if (tbs1->code.num_guest_inst == 0) { + return -1; + } + if (tbs2->code.num_guest_inst == 0) { + return 1; + } + + c1 = tbs1->code.out_len / tbs1->code.num_guest_inst; + c2 = tbs2->code.out_len / tbs2->code.num_guest_inst; + } + return c2 - c1; +} + +static void dump_last_search_headers(int count) +{ + if (!last_search) { + qemu_log("No data collected yet\n"); + return; + } + + GList *l = last_search; + while (l != NULL && count--) { + TBStatistics *tbs = (TBStatistics *) l->data; + GList *next = l->next; + dump_tb_header(tbs); + l = next; + } +} + +static uint64_t calculate_last_search_coverages(void) +{ + uint64_t total_exec_count = 0; + GList *i; + + /* Compute total execution count for all tbs */ + for (i = last_search; i; i = i->next) { + TBStatistics *tbs = (TBStatistics *) i->data; + total_exec_count += + (tbs->executions.atomic + tbs->executions.normal) + * tbs->code.num_guest_inst; + } + + for (i = last_search; i; i = i->next) { + TBStatistics *tbs = (TBStatistics *) i->data; + uint64_t tb_total_execs = + (tbs->executions.atomic + tbs->executions.normal) + * tbs->code.num_guest_inst; + tbs->executions.coverage = + (10000 * tb_total_execs) / (total_exec_count + 1); + } + + return total_exec_count; +} + +static void do_dump_tbs_info(int total, int sort_by) +{ + id = 1; + GList *i; + int count = total; + + g_list_free(last_search); + last_search = NULL; + + qht_iter(&tb_ctx.tb_stats, collect_tb_stats, NULL); + + last_search = g_list_sort_with_data(last_search, inverse_sort_tbs, + &sort_by); + + if (!last_search) { + qemu_printf("No data collected yet!\n"); + return; + } + + calculate_last_search_coverages(); + + for (i = last_search; i && count--; i = i->next) { + TBStatistics *tbs = (TBStatistics *) i->data; + tbs->display_id = id++; + } + + /* free the unused bits */ + if (i) { + if (i->next) { + i->next->prev = NULL; + } + g_list_free(i->next); + i->next = NULL; + } + + dump_last_search_headers(total); +} + +struct tbs_dump_info { + int count; + int sort_by; +}; + +static void do_dump_tbs_info_safe(CPUState *cpu, run_on_cpu_data tbdi) +{ + struct tbs_dump_info *info = tbdi.host_ptr; + qemu_log_to_monitor(true); + do_dump_tbs_info(info->count, info->sort_by); + qemu_log_to_monitor(false); + g_free(info); +} + +/* + * When we dump_tbs_info on a live system via the HMP we want to + * ensure the system is quiessent before we start outputting stuff. + * Otherwise we could pollute the output with other logging output. + */ + +void dump_tbs_info(int count, int sort_by, bool use_monitor) +{ + if (use_monitor) { + struct tbs_dump_info *tbdi = g_new(struct tbs_dump_info, 1); + tbdi->count = count; + tbdi->sort_by = sort_by; + async_safe_run_on_cpu(first_cpu, do_dump_tbs_info_safe, + RUN_ON_CPU_HOST_PTR(tbdi)); + } else { + do_dump_tbs_info(count, sort_by); + } +} + +/* + * We cannot always re-generate the code even if we know there are + * valid translations still in the cache. The reason being the guest + * may have un-mapped the page code. In real life this would be + * un-reachable as the jump cache is cleared and the following QHT + * lookup will do a get_page_addr_code() and fault. + * + * TODO: can we do this safely? We need to + * a) somehow recover the mmu_idx for this translation + * b) probe MMU_INST_FETCH to know it will succeed + */ +static GString *get_code_string(TBStatistics *tbs, int log_flags) +{ + int old_log_flags = qemu_loglevel; + + CPUState *cpu = first_cpu; + uint32_t cflags = curr_cflags(cpu); + TranslationBlock *tb = NULL; + + GString *code_s = g_string_new(NULL); + qemu_log_to_string(true, code_s); + + Error *err = NULL; + if (!qemu_set_log(log_flags, &err)) { + g_string_append_printf(code_s, "%s", error_get_pretty(err)); + error_free(err); + } + + if (sigsetjmp(cpu->jmp_env, 0) == 0) { + mmap_lock(); + tb = tb_gen_code(cpu, tbs->pc, tbs->cs_base, tbs->flags, cflags); + tb_phys_invalidate(tb, -1); + mmap_unlock(); + } else { + /* + * The mmap_lock is dropped by tb_gen_code if it runs out of + * memory. + */ + qemu_log("\ncould not gen code for this TB (no longer mapped?)\n"); + assert_no_pages_locked(); + } + + qemu_set_log(old_log_flags, &err); + qemu_log_to_string(false, NULL); + + return code_s; +} + +static void do_tb_dump_with_statistics(TBStatistics *tbs, int log_flags) +{ + g_autoptr(GString) code_s = NULL; + + qemu_log("\n------------------------------\n\n"); + + if (dump_tb_header(tbs) > 0) { + code_s = get_code_string(tbs, log_flags); + } else { + code_s = g_string_new("cannot re-translate non-active translation"); + } + qemu_log("%s", code_s->str); + qemu_log("------------------------------\n"); +} + +struct tb_dump_info { + int id; + int log_flags; + bool use_monitor; +}; + +static void do_dump_tb_info_safe(CPUState *cpu, run_on_cpu_data info) +{ + struct tb_dump_info *tbdi = (struct tb_dump_info *) info.host_ptr; + + if (!last_search) { + qemu_log("no search on record\n"); + return; + } + + qemu_log_to_monitor(tbdi->use_monitor); + + TBStatistics *tbs = get_tbstats_by_id(tbdi->id); + if (tbs) { + do_tb_dump_with_statistics(tbs, tbdi->log_flags); + } else { + qemu_log("no TB statitics found with id %d\n", tbdi->id); + } + + qemu_log_to_monitor(false); + + g_free(tbdi); +} + +void dump_tb_info(int id, int log_mask, bool use_monitor) +{ + struct tb_dump_info *tbdi = g_new(struct tb_dump_info, 1); + + tbdi->id = id; + tbdi->log_flags = log_mask; + tbdi->use_monitor = use_monitor; + + async_safe_run_on_cpu(first_cpu, do_dump_tb_info_safe, + RUN_ON_CPU_HOST_PTR(tbdi)); + + /* tbdi free'd by do_dump_tb_info_safe */ +} + + void enable_collect_tb_stats(void) { tcg_collect_tb_stats = TB_STATS_RUNNING; diff --git a/disas.c b/disas.c index b087c12c47..326d1a5208 100644 --- a/disas.c +++ b/disas.c @@ -7,6 +7,8 @@ #include "disas/disas.h" #include "disas/capstone.h" +#include "qemu/log-for-trace.h" + typedef struct CPUDebug { struct disassemble_info info; CPUState *cpu; @@ -203,6 +205,24 @@ static void initialize_debug_host(CPUDebug *s) #endif } +static int +__attribute__((format(printf, 2, 3))) +fprintf_log(struct _IO_FILE *a, const char *b, ...) +{ + va_list ap; + va_start(ap, b); + + if (!to_string) { + vfprintf(a, b, ap); + } else { + qemu_vlog(b, ap); + } + + va_end(ap); + + return 1; +} + /* Disassemble this for me please... (debugging). */ void target_disas(FILE *out, CPUState *cpu, target_ulong code, target_ulong size) @@ -226,11 +246,12 @@ void target_disas(FILE *out, CPUState *cpu, target_ulong code, } for (pc = code; size > 0; pc += count, size -= count) { - fprintf(out, "0x" TARGET_FMT_lx ": ", pc); - count = s.info.print_insn(pc, &s.info); - fprintf(out, "\n"); - if (count < 0) - break; + fprintf_log(out, "0x" TARGET_FMT_lx ": ", pc); + count = s.info.print_insn(pc, &s.info); + fprintf_log(out, "\n"); + if (count < 0) { + break; + } if (size < count) { fprintf(out, "Disassembler disagrees with translator over instruction " diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx index 47d63d26db..01d9658aea 100644 --- a/hmp-commands-info.hx +++ b/hmp-commands-info.hx @@ -262,6 +262,22 @@ ERST .params = "", .help = "show dynamic compiler info", }, + { + .name = "tb-list", + .args_type = "number:i?,sortedby:s?", + .params = "[number sortedby]", + .help = "show a [number] translated blocks sorted by [sortedby]" + "sortedby opts: hotness hg spills", + .cmd = hmp_info_tblist, + }, + { + .name = "tb", + .args_type = "id:i,flags:s?", + .params = "id [flag1,flag2,...]", + .help = "show information about one translated block by id." + "dump flags can be used to set dump code level: out_asm in_asm op", + .cmd = hmp_info_tb, + }, #endif SRST diff --git a/include/exec/tb-stats.h b/include/exec/tb-stats.h index ec47cbecc2..3d2b167b0e 100644 --- a/include/exec/tb-stats.h +++ b/include/exec/tb-stats.h @@ -35,8 +35,11 @@ enum SortBy { SORT_BY_HOTNESS, SORT_BY_HG /* Host/Guest */, SORT_BY_SPILLS }; enum TbstatsCmd { START, PAUSE, STOP, FILTER }; +#define tbs_stats_enabled(tbs, JIT_STATS) \ + (tbs && (tbs->stats_enabled & JIT_STATS)) + #define tb_stats_enabled(tb, JIT_STATS) \ - (tb && tb->tb_stats && (tb->tb_stats->stats_enabled & JIT_STATS)) + (tb && tb->tb_stats && tbs_stats_enabled(tb->tb_stats, JIT_STATS)) #define stat_per_translation(stat, name) \ (stat->translations.total ? stat->name / stat->translations.total : 0) @@ -65,6 +68,8 @@ struct TBStatistics { struct { unsigned long normal; unsigned long atomic; + /* filled only when dumping x% cover set */ + uint16_t coverage; } executions; /* JIT Stats - protected by lock */ @@ -87,7 +92,6 @@ struct TBStatistics { struct { unsigned long total; - unsigned long uncached; unsigned long spanning; } translations; @@ -107,6 +111,9 @@ struct TBStatistics { uint64_t la; uint64_t code; } gen_times; + + /* HMP information - used for referring to previous search */ + int display_id; }; bool tb_stats_cmp(const void *ap, const void *bp); @@ -133,4 +140,26 @@ void do_hmp_tbstats_safe(CPUState *cpu, run_on_cpu_data icmd); */ void tbstats_reset_tbs(void); +/** + * dump_tbs_info: report the hottest blocks + * + * @count: the limit of hotblocks + * @sort_by: property in which the dump will be sorted + * @use_monitor: redirect output to monitor + * + * Report the hottest blocks to either the log or monitor + */ +void dump_tbs_info(int count, int sort_by, bool use_monitor); + +/** + * dump_tb_info: dump information about one TB + * + * @id: the display id of the block (from previous search) + * @mask: the temporary logging mask + * @Use_monitor: redirect output to monitor + * + * Re-run a translation of a block at addr for the purposes of debug output + */ +void dump_tb_info(int id, int log_mask, bool use_monitor); + #endif diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h index 207ec19b34..69f3a75fef 100644 --- a/include/monitor/hmp.h +++ b/include/monitor/hmp.h @@ -182,5 +182,7 @@ 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); +void hmp_info_tblist(Monitor *mon, const QDict *qdict); +void hmp_info_tb(Monitor *mon, const QDict *qdict); #endif diff --git a/include/qemu/log-for-trace.h b/include/qemu/log-for-trace.h index d47c9cd446..5d0afc56c7 100644 --- a/include/qemu/log-for-trace.h +++ b/include/qemu/log-for-trace.h @@ -20,6 +20,9 @@ /* Private global variable, don't use */ extern int qemu_loglevel; +extern bool to_string; + +extern int32_t max_num_hot_tbs_to_dump; #define LOG_TRACE (1 << 15) @@ -30,6 +33,7 @@ static inline bool qemu_loglevel_mask(int mask) } /* main logging function */ -void G_GNUC_PRINTF(1, 2) qemu_log(const char *fmt, ...); +int G_GNUC_PRINTF(1, 2) qemu_log(const char *fmt, ...); +int G_GNUC_PRINTF(1, 0) qemu_vlog(const char *fmt, va_list va); #endif diff --git a/include/qemu/log.h b/include/qemu/log.h index 6f3b8091cd..26b33151f3 100644 --- a/include/qemu/log.h +++ b/include/qemu/log.h @@ -85,6 +85,8 @@ extern const QEMULogItem qemu_log_items[]; bool qemu_set_log(int log_flags, Error **errp); bool qemu_set_log_filename(const char *filename, Error **errp); bool qemu_set_log_filename_flags(const char *name, int flags, Error **errp); +void qemu_log_to_monitor(bool enable); +void qemu_log_to_string(bool enable, GString *s); void qemu_set_dfilter_ranges(const char *ranges, Error **errp); bool qemu_log_in_addr_range(uint64_t addr); int qemu_str_to_log_mask(const char *str); diff --git a/util/log.c b/util/log.c index 7ae471d97c..6477eb5a5f 100644 --- a/util/log.c +++ b/util/log.c @@ -50,6 +50,8 @@ int qemu_loglevel; static bool log_per_thread; static GArray *debug_regions; int32_t max_num_hot_tbs_to_dump; +static bool to_monitor; +bool to_string; /* Returns true if qemu_log() will really write somewhere. */ bool qemu_log_enabled(void) @@ -146,19 +148,6 @@ void qemu_log_unlock(FILE *logfile) } } -void qemu_log(const char *fmt, ...) -{ - FILE *f = qemu_log_trylock(); - if (f) { - va_list ap; - - va_start(ap, fmt); - vfprintf(f, fmt, ap); - va_end(ap); - qemu_log_unlock(f); - } -} - static void __attribute__((__constructor__)) startup(void) { qemu_mutex_init(&global_mutex); @@ -206,6 +195,55 @@ valid_filename_template(const char *filename, bool per_thread, Error **errp) return filename ? vft_strdup : vft_stderr; } +GString *string; + +int qemu_vlog(const char *fmt, va_list va) +{ + int ret = 0; + + if (to_string && string) { + g_string_append_vprintf(string, fmt, va); + } else if (to_monitor) { + ret = qemu_vprintf(fmt, va); + } else { + FILE *f = qemu_log_trylock(); + if (f) { + ret = vfprintf(f, fmt, va); + } + qemu_log_unlock(f); + } + + /* Don't pass back error results. */ + if (ret < 0) { + ret = 0; + } + return ret; +} + +/* Return the number of characters emitted. */ +int qemu_log(const char *fmt, ...) +{ + int ret = 0; + va_list ap; + + va_start(ap, fmt); + ret = qemu_vlog(fmt, ap); + va_end(ap); + + return ret; +} + +void qemu_log_to_monitor(bool enable) +{ + to_monitor = enable; +} + +void qemu_log_to_string(bool enable, GString *s) +{ + to_string = enable; + string = s; +} + /* enable or disable low levels log */ static bool qemu_set_log_internal(const char *filename, bool changed_name, int log_flags, Error **errp) @@ -523,6 +561,7 @@ int qemu_str_to_log_mask(const char *str) trace_enable_events((*tmp) + 6); mask |= LOG_TRACE; #endif +#ifdef CONFIG_TCG } else if (g_str_has_prefix(*tmp, "tb_stats")) { mask |= CPU_LOG_TB_STATS; set_default_tbstats_flag(TB_ALL_STATS); @@ -553,6 +592,7 @@ int qemu_str_to_log_mask(const char *str) } set_default_tbstats_flag(flags); } +#endif } else { for (item = qemu_log_items; item->mask != 0; item++) { if (g_str_equal(*tmp, item->name)) {