Messages in this thread | | | Date | Mon, 5 Feb 2024 20:19:38 +0800 | From | Changbin Du <> | Subject | Re: [PATCH v5 3/5] perf: script: add field 'disasm' to display mnemonic instructions |
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On Mon, Feb 05, 2024 at 11:23:21AM +0200, Adrian Hunter wrote: > On 22/01/24 13:20, Changbin Du wrote: > > In addition to the 'insn' field, this adds a new field 'disasm' to > > display mnemonic instructions instead of the raw code. > > > > $ sudo perf script -F +disasm > > perf-exec 1443864 [006] 2275506.209848: psb: psb offs: 0 0 [unknown] ([unknown]) > > perf-exec 1443864 [006] 2275506.209848: cbr: cbr: 41 freq: 4100 MHz (114%) 0 [unknown] ([unknown]) > > ls 1443864 [006] 2275506.209905: 1 branches:uH: 7f216b426100 _start+0x0 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) movq %rsp, %rdi > > ls 1443864 [006] 2275506.209908: 1 branches:uH: 7f216b426103 _start+0x3 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) callq _dl_start+0x0 > > > > Signed-off-by: Changbin Du <changbin.du@huawei.com> > > > > --- > > v2: > > - update Documentation. > > --- > > tools/perf/Documentation/perf-script.txt | 13 +++++++------ > > tools/perf/builtin-script.c | 8 +++++++- > > 2 files changed, 14 insertions(+), 7 deletions(-) > > > > diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt > > index ff9a52e44688..578fa59f51a5 100644 > > --- a/tools/perf/Documentation/perf-script.txt > > +++ b/tools/perf/Documentation/perf-script.txt > > @@ -132,9 +132,10 @@ OPTIONS > > Comma separated list of fields to print. Options are: > > comm, tid, pid, time, cpu, event, trace, ip, sym, dso, dsoff, addr, symoff, > > srcline, period, iregs, uregs, brstack, brstacksym, flags, bpf-output, > > - brstackinsn, brstackinsnlen, brstackoff, callindent, insn, insnlen, synth, > > - phys_addr, metric, misc, srccode, ipc, data_page_size, code_page_size, ins_lat, > > - machine_pid, vcpu, cgroup, retire_lat. > > + brstackinsn, brstackinsnlen, brstackoff, callindent, insn, disasm, > > + insnlen, synth, phys_addr, metric, misc, srccode, ipc, data_page_size, > > + code_page_size, ins_lat, machine_pid, vcpu, cgroup, retire_lat. > > + > > Field list can be prepended with the type, trace, sw or hw, > > to indicate to which event type the field list applies. > > e.g., -F sw:comm,tid,time,ip,sym and -F trace:time,cpu,trace > > @@ -217,9 +218,9 @@ OPTIONS > > Instruction Trace decoding. For calls and returns, it will display the > > name of the symbol indented with spaces to reflect the stack depth. > > > > - When doing instruction trace decoding insn and insnlen give the > > - instruction bytes and the instruction length of the current > > - instruction. > > + When doing instruction trace decoding, insn, disasm and insnlen give the > > + instruction bytes, disassembled instructions (requires libcapstone support) > > + and the instruction length of the current instruction respectively. > > > > The synth field is used by synthesized events which may be created when > > Instruction Trace decoding. > > diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c > > index 4817a37f16e2..4ac9670704ff 100644 > > --- a/tools/perf/builtin-script.c > > +++ b/tools/perf/builtin-script.c > > @@ -135,6 +135,7 @@ enum perf_output_field { > > PERF_OUTPUT_CGROUP = 1ULL << 39, > > PERF_OUTPUT_RETIRE_LAT = 1ULL << 40, > > PERF_OUTPUT_DSOFF = 1ULL << 41, > > + PERF_OUTPUT_DISASM = 1ULL << 42, > > }; > > > > struct perf_script { > > @@ -190,6 +191,7 @@ struct output_option { > > {.str = "bpf-output", .field = PERF_OUTPUT_BPF_OUTPUT}, > > {.str = "callindent", .field = PERF_OUTPUT_CALLINDENT}, > > {.str = "insn", .field = PERF_OUTPUT_INSN}, > > + {.str = "disasm", .field = PERF_OUTPUT_DISASM}, > > {.str = "insnlen", .field = PERF_OUTPUT_INSNLEN}, > > {.str = "brstackinsn", .field = PERF_OUTPUT_BRSTACKINSN}, > > {.str = "brstackoff", .field = PERF_OUTPUT_BRSTACKOFF}, > > @@ -1515,6 +1517,10 @@ static int perf_sample__fprintf_insn(struct perf_sample *sample, > > printed += fprintf(fp, " insn: "); > > printed += sample__fprintf_insn_raw(sample, fp); > > } > > + if (PRINT_FIELD(DISASM) && sample->insn_len) { > > + printed += fprintf(fp, "\t\t"); > > This is good, except if both 'insn' and 'disasm' are used together. > It either: > a) without libcapstone, prints insn bytes twice > > Probably simpler to make 'disasm' without libcapstone > a fatal error explaining that perf needs to be built > with libcapstone support for 'disasm' to work. > Instead of fatal error, I print a warning message for this. Because perf_sample__fprintf_insn() cannot return negtive error number.
> b) with libcapstone, disassembly does not line up nicely >
-- Cheers, Changbin Du
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