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Message-ID: <ZpGfvwxGh1ud6SeP@google.com>
Date: Fri, 12 Jul 2024 16:27:27 -0500
From: Namhyung Kim <namhyung@...nel.org>
To: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Cc: acme@...nel.org, jolsa@...nel.org, adrian.hunter@...el.com,
irogers@...gle.com, segher@...nel.crashing.org,
christophe.leroy@...roup.eu, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
akanksha@...ux.ibm.com, maddy@...ux.ibm.com, kjain@...ux.ibm.com,
disgoel@...ux.vnet.ibm.com
Subject: Re: [PATCH V6 18/18] tools/perf: Set instruction name to be used
with insn-stat when using raw instruction
On Sun, Jul 07, 2024 at 08:14:19PM +0530, Athira Rajeev wrote:
> Since the "ins.name" is not set while using raw instruction,
> perf annotate with insn-stat gives wrong data:
>
> Result from "./perf annotate --data-type --insn-stat":
>
> Annotate Instruction stats
> total 615, ok 419 (68.1%), bad 196 (31.9%)
>
> Name : Good Bad
> -----------------------------------------------------------
> : 419 196
>
> Patch sets "dl->ins.name" in arch specific function "check_ppc_insn"
> while initialising "struct disasm_line". Also update "ins_find" function
> to pass "struct disasm_line" as a parameter so as to set its name field
> in arch specific call.
>
> With the patch changes:
>
> Annotate Instruction stats
> total 609, ok 446 (73.2%), bad 163 (26.8%)
>
> Name/opcode: Good Bad
> -----------------------------------------------------------
> 58 : 323 80
> 32 : 49 43
> 34 : 33 11
> OP_31_XOP_LDX : 8 20
> 40 : 23 0
> OP_31_XOP_LWARX : 5 1
> OP_31_XOP_LWZX : 2 3
> OP_31_XOP_LDARX : 3 0
> 33 : 0 2
> OP_31_XOP_LBZX : 0 1
> OP_31_XOP_LWAX : 0 1
> OP_31_XOP_LHZX : 0 1
>
> Signed-off-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
> ---
> .../perf/arch/powerpc/annotate/instructions.c | 18 +++++++++++++++---
> tools/perf/builtin-annotate.c | 4 ++--
> tools/perf/util/annotate.c | 2 +-
> tools/perf/util/disasm.c | 10 +++++-----
> tools/perf/util/disasm.h | 2 +-
> 5 files changed, 24 insertions(+), 12 deletions(-)
>
> diff --git a/tools/perf/arch/powerpc/annotate/instructions.c b/tools/perf/arch/powerpc/annotate/instructions.c
> index af1032572bf3..ede9eeade0ab 100644
> --- a/tools/perf/arch/powerpc/annotate/instructions.c
> +++ b/tools/perf/arch/powerpc/annotate/instructions.c
> @@ -189,8 +189,9 @@ static int cmp_offset(const void *a, const void *b)
> return (val1->value - val2->value);
> }
>
> -static struct ins_ops *check_ppc_insn(u32 raw_insn)
> +static struct ins_ops *check_ppc_insn(struct disasm_line *dl)
> {
> + int raw_insn = dl->raw.raw_insn;
> int opcode = PPC_OP(raw_insn);
> int mem_insn_31 = PPC_21_30(raw_insn);
> struct insn_offset *ret;
> @@ -198,19 +199,30 @@ static struct ins_ops *check_ppc_insn(u32 raw_insn)
> "OP_31_INSN",
> mem_insn_31
> };
> + char name_insn[32];
>
> /*
> * Instructions with opcode 32 to 63 are memory
> * instructions in powerpc
> */
> if ((opcode & 0x20)) {
> + /*
> + * Set name in case of raw instruction to
> + * opcode to be used in insn-stat
> + */
> + if (!strlen(dl->ins.name)) {
> + sprintf(name_insn, "%d", opcode);
> + dl->ins.name = strdup(name_insn);
> + }
> return &load_store_ops;
> } else if (opcode == 31) {
> /* Check for memory instructions with opcode 31 */
> ret = bsearch(&mem_insns_31_opcode, ins_array, ARRAY_SIZE(ins_array), sizeof(ins_array[0]), cmp_offset);
> - if (ret != NULL)
> + if (ret) {
> + if (!strlen(dl->ins.name))
> + dl->ins.name = strdup(ret->name);
> return &load_store_ops;
> - else {
> + } else {
> mem_insns_31_opcode.value = PPC_22_30(raw_insn);
> ret = bsearch(&mem_insns_31_opcode, arithmetic_ins_op_31, ARRAY_SIZE(arithmetic_ins_op_31),
> sizeof(arithmetic_ins_op_31[0]), cmp_offset);
> diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
> index b10b7f005658..68e929d4746e 100644
> --- a/tools/perf/builtin-annotate.c
> +++ b/tools/perf/builtin-annotate.c
> @@ -396,10 +396,10 @@ static void print_annotate_item_stat(struct list_head *head, const char *title)
> printf("total %d, ok %d (%.1f%%), bad %d (%.1f%%)\n\n", total,
> total_good, 100.0 * total_good / (total ?: 1),
> total_bad, 100.0 * total_bad / (total ?: 1));
> - printf(" %-10s: %5s %5s\n", "Name", "Good", "Bad");
> + printf(" %-10s: %5s %5s\n", "Name/opcode", "Good", "Bad");
It should be "%-20s".
Thanks,
Namhyung
> printf("-----------------------------------------------------------\n");
> list_for_each_entry(istat, head, list)
> - printf(" %-10s: %5d %5d\n", istat->name, istat->good, istat->bad);
> + printf(" %-20s: %5d %5d\n", istat->name, istat->good, istat->bad);
> printf("\n");
> }
>
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index 8db2f32700aa..e1f24dff8042 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -2229,7 +2229,7 @@ static struct annotated_item_stat *annotate_data_stat(struct list_head *head,
> return NULL;
>
> istat->name = strdup(name);
> - if (istat->name == NULL) {
> + if ((istat->name == NULL) || (!strlen(istat->name))) {
> free(istat);
> return NULL;
> }
> diff --git a/tools/perf/util/disasm.c b/tools/perf/util/disasm.c
> index 63681df6482b..cd283c42195c 100644
> --- a/tools/perf/util/disasm.c
> +++ b/tools/perf/util/disasm.c
> @@ -859,7 +859,7 @@ static void ins__sort(struct arch *arch)
> qsort(arch->instructions, nmemb, sizeof(struct ins), ins__cmp);
> }
>
> -static struct ins_ops *__ins__find(struct arch *arch, const char *name, u32 raw_insn)
> +static struct ins_ops *__ins__find(struct arch *arch, const char *name, struct disasm_line *dl)
> {
> struct ins *ins;
> const int nmemb = arch->nr_instructions;
> @@ -871,7 +871,7 @@ static struct ins_ops *__ins__find(struct arch *arch, const char *name, u32 raw_
> */
> struct ins_ops *ops;
>
> - ops = check_ppc_insn(raw_insn);
> + ops = check_ppc_insn(dl);
> if (ops)
> return ops;
> }
> @@ -905,9 +905,9 @@ static struct ins_ops *__ins__find(struct arch *arch, const char *name, u32 raw_
> return ins ? ins->ops : NULL;
> }
>
> -struct ins_ops *ins__find(struct arch *arch, const char *name, u32 raw_insn)
> +struct ins_ops *ins__find(struct arch *arch, const char *name, struct disasm_line *dl)
> {
> - struct ins_ops *ops = __ins__find(arch, name, raw_insn);
> + struct ins_ops *ops = __ins__find(arch, name, dl);
>
> if (!ops && arch->associate_instruction_ops)
> ops = arch->associate_instruction_ops(arch, name);
> @@ -917,7 +917,7 @@ struct ins_ops *ins__find(struct arch *arch, const char *name, u32 raw_insn)
>
> static void disasm_line__init_ins(struct disasm_line *dl, struct arch *arch, struct map_symbol *ms)
> {
> - dl->ins.ops = ins__find(arch, dl->ins.name, dl->raw.raw_insn);
> + dl->ins.ops = ins__find(arch, dl->ins.name, dl);
>
> if (!dl->ins.ops)
> return;
> diff --git a/tools/perf/util/disasm.h b/tools/perf/util/disasm.h
> index c1bb1e484bfb..f56beedeb9da 100644
> --- a/tools/perf/util/disasm.h
> +++ b/tools/perf/util/disasm.h
> @@ -105,7 +105,7 @@ struct annotate_args {
> struct arch *arch__find(const char *name);
> bool arch__is(struct arch *arch, const char *name);
>
> -struct ins_ops *ins__find(struct arch *arch, const char *name, u32 raw_insn);
> +struct ins_ops *ins__find(struct arch *arch, const char *name, struct disasm_line *dl);
> int ins__scnprintf(struct ins *ins, char *bf, size_t size,
> struct ins_operands *ops, int max_ins_name);
>
> --
> 2.43.0
>
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