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X-Received-From: 2607:f8b0:4864:20::741 Subject: [Qemu-devel] [PATCH v1 1/2] accel/tcg: adding integration with linux perf X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Riku Voipio , vandersonmr , Laurent Vivier , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" This commit adds support to Linux Perf in order to be able to analyze qemu jitted code and also to able to see the TBs PC in it. Signed-off-by: Vanderson M. do Rosario --- accel/tcg/Makefile.objs | 1 + accel/tcg/perf/Makefile.objs | 1 + accel/tcg/perf/jitdump.c | 180 +++++++++++++++++++++++++++++++++++ accel/tcg/perf/jitdump.h | 19 ++++ accel/tcg/translate-all.c | 12 +++ include/qemu-common.h | 3 + linux-user/main.c | 7 ++ qemu-options.hx | 12 +++ 8 files changed, 235 insertions(+) create mode 100644 accel/tcg/perf/Makefile.objs create mode 100644 accel/tcg/perf/jitdump.c create mode 100644 accel/tcg/perf/jitdump.h diff --git a/accel/tcg/Makefile.objs b/accel/tcg/Makefile.objs index d381a02f34..f393a7438f 100644 --- a/accel/tcg/Makefile.objs +++ b/accel/tcg/Makefile.objs @@ -3,6 +3,7 @@ obj-$(CONFIG_SOFTMMU) +=3D cputlb.o obj-y +=3D tcg-runtime.o tcg-runtime-gvec.o obj-y +=3D cpu-exec.o cpu-exec-common.o translate-all.o obj-y +=3D translator.o +obj-y +=3D perf/ =20 obj-$(CONFIG_USER_ONLY) +=3D user-exec.o obj-$(call lnot,$(CONFIG_SOFTMMU)) +=3D user-exec-stub.o diff --git a/accel/tcg/perf/Makefile.objs b/accel/tcg/perf/Makefile.objs new file mode 100644 index 0000000000..f82fba35e5 --- /dev/null +++ b/accel/tcg/perf/Makefile.objs @@ -0,0 +1 @@ +obj-y +=3D jitdump.o diff --git a/accel/tcg/perf/jitdump.c b/accel/tcg/perf/jitdump.c new file mode 100644 index 0000000000..6f4c0911c2 --- /dev/null +++ b/accel/tcg/perf/jitdump.c @@ -0,0 +1,180 @@ +#ifdef __linux__ + +#include + +#include +#include +#include +#include +#include + +#include "jitdump.h" +#include "qemu-common.h" + +struct jitheader { + uint32_t magic; /* characters "jItD" */ + uint32_t version; /* header version */ + uint32_t total_size;/* total size of header */ + uint32_t elf_mach; /* elf mach target */ + uint32_t pad1; /* reserved */ + uint32_t pid; /* JIT process id */ + uint64_t timestamp; /* timestamp */ + uint64_t flags; /* flags */ +}; + +enum jit_record_type { + JIT_CODE_LOAD =3D 0, + JIT_CODE_MOVE =3D 1, + JIT_CODE_DEBUG_INFO =3D 2, + JIT_CODE_CLOSE =3D 3, + + JIT_CODE_MAX, +}; + +/* record prefix (mandatory in each record) */ +struct jr_prefix { + uint32_t id; + uint32_t total_size; + uint64_t timestamp; +}; + +struct jr_code_load { + struct jr_prefix p; + + uint32_t pid; + uint32_t tid; + uint64_t vma; + uint64_t code_addr; + uint64_t code_size; + uint64_t code_index; +}; + +struct jr_code_close { + struct jr_prefix p; +}; + +struct jr_code_move { + struct jr_prefix p; + + uint32_t pid; + uint32_t tid; + uint64_t vma; + uint64_t old_code_addr; + uint64_t new_code_addr; + uint64_t code_size; + uint64_t code_index; +}; + +FILE *dumpfile; +void *perf_marker; + +static uint64_t get_timestamp(void) +{ + struct timespec ts; + if (clock_gettime(CLOCK_MONOTONIC, &ts)) { + fprintf(stderr, "No support for CLOCK_MONOTONIC! -perf cannot be u= sed!\n"); + exit(1); + } + return (uint64_t) ts.tv_sec * 1000000000 + ts.tv_nsec; +} + +static uint32_t get_e_machine(void) +{ + uint32_t e_machine =3D EM_NONE; + Elf64_Ehdr elf_header; + FILE *exe =3D fopen("/proc/self/exe", "r"); + + if (exe =3D=3D NULL) { + return e_machine; + } + + if (fread(&elf_header, sizeof(Elf64_Ehdr), 1, exe) !=3D 1) { + goto end; + } + + e_machine =3D elf_header.e_machine; + +end: + fclose(exe); + return e_machine; +} + +void start_jitdump_file(void) +{ + GString *dumpfile_name =3D g_string_new(NULL);; + g_string_printf(dumpfile_name, "./jit-%d.dump", getpid()); + dumpfile =3D fopen(dumpfile_name->str, "w+"); + + perf_marker =3D mmap(NULL, sysconf(_SC_PAGESIZE), + PROT_READ | PROT_EXEC, + MAP_PRIVATE, + fileno(dumpfile), 0); + + if (perf_marker =3D=3D MAP_FAILED) { + printf("Failed to create mmap marker file for perf %d\n", fileno(d= umpfile)); + fclose(dumpfile); + return; + } + + g_string_free(dumpfile_name, TRUE); + + struct jitheader *header =3D g_new0(struct jitheader, 1); + header->magic =3D 0x4A695444; + header->version =3D 1; + header->elf_mach =3D get_e_machine(); + header->total_size =3D sizeof(struct jitheader); + header->pid =3D getpid(); + header->timestamp =3D get_timestamp(); + + fwrite(header, header->total_size, 1, dumpfile); + + free(header); + fflush(dumpfile); +} + +void append_load_in_jitdump_file(TranslationBlock *tb) +{ + GString *func_name =3D g_string_new(NULL); + g_string_printf(func_name, "TB virt:0x"TARGET_FMT_lx"%c", tb->pc, '\0'= ); + + struct jr_code_load *load_event =3D g_new0(struct jr_code_load, 1); + load_event->p.id =3D JIT_CODE_LOAD; + load_event->p.total_size =3D sizeof(struct jr_code_load) + func_name->= len + tb->tc.size; + load_event->p.timestamp =3D get_timestamp(); + load_event->pid =3D getpid(); + load_event->tid =3D syscall(SYS_gettid); + load_event->vma =3D tb->pc; + load_event->code_addr =3D (uint64_t) tb->tc.ptr; + load_event->code_size =3D tb->tc.size; + load_event->code_index =3D tb->pc; + + fwrite(load_event, sizeof(struct jr_code_load), 1, dumpfile); + fwrite(func_name->str, func_name->len, 1, dumpfile); + fwrite(tb->tc.ptr, tb->tc.size, 1, dumpfile); + + g_string_free(func_name, TRUE); + free(load_event); + fflush(dumpfile); +} + +void close_jitdump_file(void) +{ + fclose(dumpfile); + if (perf_marker !=3D MAP_FAILED) { + munmap(perf_marker, sysconf(_SC_PAGESIZE)); + } +} + +bool is_jitdump_enabled; + +void jitdump_enable(void) +{ + is_jitdump_enabled =3D true; +} + +bool jitdump_enabled(void) +{ + return is_jitdump_enabled; +} + +#endif diff --git a/accel/tcg/perf/jitdump.h b/accel/tcg/perf/jitdump.h new file mode 100644 index 0000000000..12c0991b04 --- /dev/null +++ b/accel/tcg/perf/jitdump.h @@ -0,0 +1,19 @@ +#ifdef __linux__ +#ifndef JITDUMP_H +#define JITDUMP_H + +#include "qemu/osdep.h" + +#include "disas/disas.h" +#include "exec/exec-all.h" + +void start_jitdump_file(void); + +void append_load_in_jitdump_file(TranslationBlock *tb); +void append_move_in_jitdump_file(TranslationBlock *tb); + +void close_jitdump_file(void); + +#endif + +#endif diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index 5d1e08b169..0a4211d3d2 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -58,6 +58,8 @@ #include "sysemu/cpus.h" #include "sysemu/tcg.h" =20 +#include "perf/jitdump.h" + /* #define DEBUG_TB_INVALIDATE */ /* #define DEBUG_TB_FLUSH */ /* make various TB consistency checks */ @@ -1148,6 +1150,11 @@ void tcg_exec_init(unsigned long tb_size) cpu_gen_init(); page_init(); tb_htable_init(); +#ifdef __linux__ + if (jitdump_enabled()) { + start_jitdump_file(); + } +#endif code_gen_alloc(tb_size); #if defined(CONFIG_SOFTMMU) /* There's no guest base to take into account, so go ahead and @@ -1877,6 +1884,11 @@ TranslationBlock *tb_gen_code(CPUState *cpu, return existing_tb; } tcg_tb_insert(tb); +#ifdef __linux__ + if (jitdump_enabled()) { + append_load_in_jitdump_file(tb); + } +#endif return tb; } =20 diff --git a/include/qemu-common.h b/include/qemu-common.h index 0235cd3b91..bd564a9e5c 100644 --- a/include/qemu-common.h +++ b/include/qemu-common.h @@ -130,4 +130,7 @@ void page_size_init(void); * returned. */ bool dump_in_progress(void); =20 +void jitdump_enable(void); +bool jitdump_enabled(void); + #endif diff --git a/linux-user/main.c b/linux-user/main.c index 8ffc525195..6521cf0c68 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -378,6 +378,11 @@ static void handle_arg_strace(const char *arg) do_strace =3D 1; } =20 +static void handle_arg_perf(const char *arg) +{ + jitdump_enable(); +} + static void handle_arg_version(const char *arg) { printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION @@ -443,6 +448,8 @@ static const struct qemu_argument arg_table[] =3D { "", "Seed for pseudo-random number generator"}, {"trace", "QEMU_TRACE", true, handle_arg_trace, "", "[[enable=3D]][,events=3D][,file=3D]"}, + {"perf", "QEMU_PERF", false, handle_arg_perf, + "", "dump jitdump files to help linux perf JIT code visuali= zation"}, {"version", "QEMU_VERSION", false, handle_arg_version, "", "display version information and exit"}, {NULL, NULL, false, NULL, NULL, NULL} diff --git a/qemu-options.hx b/qemu-options.hx index 9621e934c0..1c26eeeb9c 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -4147,6 +4147,18 @@ STEXI Enable FIPS 140-2 compliance mode. 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Wed, 14 Aug 2019 19:37:44 -0700 (PDT) From: vandersonmr To: qemu-devel@nongnu.org Date: Wed, 14 Aug 2019 23:37:25 -0300 Message-Id: <20190815023725.2659-3-vandersonmr2@gmail.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190815023725.2659-1-vandersonmr2@gmail.com> References: <20190815023725.2659-1-vandersonmr2@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::842 Subject: [Qemu-devel] [PATCH v1 2/2] tb-stats: adding TBStatistics info into perf dump X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , vandersonmr , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Adding TBStatistics information to linux perf TB's symbol names. This commit depends on the following PATCH: [PATCH v5 00/10] Measure Tiny Code Generation Quality Signed-off-by: Vanderson M. do Rosario --- accel/tcg/perf/jitdump.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/accel/tcg/perf/jitdump.c b/accel/tcg/perf/jitdump.c index 6f4c0911c2..b2334fd601 100644 --- a/accel/tcg/perf/jitdump.c +++ b/accel/tcg/perf/jitdump.c @@ -8,6 +8,7 @@ #include #include =20 +#include "exec/tb-stats.h" #include "jitdump.h" #include "qemu-common.h" =20 @@ -135,7 +136,19 @@ void start_jitdump_file(void) void append_load_in_jitdump_file(TranslationBlock *tb) { GString *func_name =3D g_string_new(NULL); - g_string_printf(func_name, "TB virt:0x"TARGET_FMT_lx"%c", tb->pc, '\0'= ); + if (tb->tb_stats) { + TBStatistics *tbs =3D tb->tb_stats; + g =3D stat_per_translation(tbs, code.num_guest_inst); + ops =3D stat_per_translation(tbs, code.num_tcg_ops); + ops_opt =3D stat_per_translation(tbs, code.num_tcg_ops_opt); + spills =3D stat_per_translation(tbs, code.spills); + + g_string_printf(func_name, + "TB virt:0x"TARGET_FMT_lx" (g:%u op:%u opt:%u spills:%d)%c= ", + tb->pc, g, ops, ops_opt, spills, '\0'); + } else { + g_string_printf(func_name, "TB virt:0x"TARGET_FMT_lx"%c", tb->pc, = '\0'); + } =20 struct jr_code_load *load_event =3D g_new0(struct jr_code_load, 1); load_event->p.id =3D JIT_CODE_LOAD; --=20 2.22.0