From nobody Mon Apr 6 18:22:51 2026 Received: from mail-dl1-f74.google.com (mail-dl1-f74.google.com [74.125.82.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BDA9A3A7F78 for ; Wed, 18 Mar 2026 17:58:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773856711; cv=none; b=CLCOBcxdyRS2e7Fe/fkCdsOZGgo4t3CY9K85ve6iiv6tcNiAke6FSLCMbRSCcovI+JAACLSb6VHxniBCR8ohYbCeoFbuOv/vU3YMyTnefL0rxa8gxJaS9egtDDagjglzFZpooaoEWuErmJlx/y1KOJZPEvxNkJG6kAGPtJ7GQrs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773856711; c=relaxed/simple; bh=VynHbodWwy+JK/PZXN/ZPJWSVpu2Hji+rVLBlhNBGT0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=UCmhaDzKlgjwQD4gwAEQP9FIjZylppWPtYiUHf8HPzxvGFNKNCTW+RaAT71dq5kJzMATeq5iyV5u5M9xbqRV0O/fW1Zz2wp9XvamAjkDe9e8tkYJJD8x4Wl37H0g5claXeULvEvSESk0PI4d9eYr9N9TloHXRZhIJK3mCGdz7yE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=W/QqyG+e; arc=none smtp.client-ip=74.125.82.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="W/QqyG+e" Received: by mail-dl1-f74.google.com with SMTP id a92af1059eb24-127876be621so34522c88.1 for ; Wed, 18 Mar 2026 10:58:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1773856709; x=1774461509; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=E6hyJgw4C1gVTP8Dmq1+Zj6/J2J6L+bYpeRT5I66L9Q=; b=W/QqyG+e5MWmQAI/+UAfWQlb0eFbtwD+Fbm0+49j7PTZQJHwSVVKSmiseTvkzrfI8s Vdv28fd0lCkxlbHp7ubiFmKZkuaDNiCGLSSR4AGg8omuxVaADshUPAE/SQVHaUI2zc/6 CvOOujAPmJpD3G4VOFtMHqXawKrJwSDqGPueXAGBYCiS0wi+H1F/qAkybBCE1gjZ7tAD eT7CvT9Z6IvEwUKm8tvk1vtGr1OJmiGt3IE0SKQWqp8Bd2osdzlj/6SLPLf3Co8VA5JV XfG8sqdPm59vAQXqwVy56vitstnfVymWh7HmqFpFkJBCWQS3nZj7T8AqdLNU0aidMZM6 5ctA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1773856709; x=1774461509; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=E6hyJgw4C1gVTP8Dmq1+Zj6/J2J6L+bYpeRT5I66L9Q=; b=atHBrxrXKdDd+tfXO6d87X+ZXmNxknlNY0rUo+zi/sWehb4kUOAIICdT/oQ0K9Zxlz D8EMDZCpCvufTABb1MArb2Sj5B6tfUSrLm07LLLdu4jySFFpFxQXIQh2uQj7xGCtd47p Q6T06ii2tywZX6ZWkXFWTxSXkSOLvhoui4XwSdHEIG+gBtsNRd2qme6IySVfo731IcZB UzXbSr0X4JnuVXfct7GnPhONwFdjXhMVZR+pLSrYLuTsWhzo97pBVAl1BXxyga0nc/4W FhIe3HkXRqwn8qC1l5XZbVMtIwI0sgnIwGyoH9n38pAb2ORqIoPTTrsXIZNcmSc+I0Ho vexg== X-Forwarded-Encrypted: i=1; AJvYcCWbd/GYY7Sf6T80WKveEeo2LGvPQm8fsJ1Fhxfi9/FviqT8eCZ+Ssmsbqez52ONe22f36jC+zcrcDjmiyw=@vger.kernel.org X-Gm-Message-State: AOJu0Yzu3P/mg2x4pY/2mCetS8XjwYdocvf/JwtwKZKsz14DBR6vL5X8 K603QWhUKXoYgRxMT2CUFcqjxwrTrc5YCk0oCnyp5eV/SrqYiJXgdRYVfMp6j8IIST/ygMhMhj/ 8khityp+U7A== X-Received: from dlae16.prod.google.com ([2002:a05:701b:2310:b0:129:86:ce7b]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:1a81:b0:11f:46b4:449f with SMTP id a92af1059eb24-12a68594d79mr220833c88.24.1773856708771; Wed, 18 Mar 2026 10:58:28 -0700 (PDT) Date: Wed, 18 Mar 2026 10:58:07 -0700 In-Reply-To: <20260318175808.582009-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260318175808.582009-1-irogers@google.com> X-Mailer: git-send-email 2.53.0.851.ga537e3e6e9-goog Message-ID: <20260318175808.582009-5-irogers@google.com> Subject: [PATCH v7 4/5] perf callchain: Refactor callchain option parsing From: Ian Rogers To: tmricht@linux.ibm.com Cc: irogers@google.com, acme@kernel.org, agordeev@linux.ibm.com, gor@linux.ibm.com, hca@linux.ibm.com, japo@linux.ibm.com, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-s390@vger.kernel.org, namhyung@kernel.org, sumanthk@linux.ibm.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" record_opts__parse_callchain is shared by builtin-record and builtin-trace, it is declared in callchain.h. Move the declaration to callchain.c for consistency with the header. In other cases make the option callback a small static stub that then calls into callchain.c. Make the no argument '-g' callchain option just a short-cut for '--call-graph fp' so that there is consistency in how the arguments are handled. This requires the const char* string to be strdup-ed in __parse_callchain_report_opt. For consistency also make parse_callchain_record use strdup and remove some unnecessary casts. Also, be more explicit with comments about the '-g' behavior if there is a .perfconfig file setting. Signed-off-by: Ian Rogers Tested-by: Thomas Richter --- tools/perf/builtin-record.c | 60 +++++------------------------- tools/perf/builtin-top.c | 20 ++++++---- tools/perf/builtin-trace.c | 9 ++++- tools/perf/util/callchain.c | 73 ++++++++++++++++++++++++++++++------- tools/perf/util/callchain.h | 12 ++---- 5 files changed, 94 insertions(+), 80 deletions(-) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 40917a0be238..26223f9505c2 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -2975,65 +2975,25 @@ static int __cmd_record(struct record *rec, int arg= c, const char **argv) return status; } =20 -static void callchain_debug(struct callchain_param *callchain) -{ - static const char *str[CALLCHAIN_MAX] =3D { "NONE", "FP", "DWARF", "LBR" = }; - - pr_debug("callchain: type %s\n", str[callchain->record_mode]); - - if (callchain->record_mode =3D=3D CALLCHAIN_DWARF) - pr_debug("callchain: stack dump size %d\n", - callchain->dump_size); -} - -int record_opts__parse_callchain(struct record_opts *record, - struct callchain_param *callchain, - const char *arg, bool unset) -{ - int ret; - callchain->enabled =3D !unset; - - /* --no-call-graph */ - if (unset) { - callchain->record_mode =3D CALLCHAIN_NONE; - pr_debug("callchain: disabled\n"); - return 0; - } - - ret =3D parse_callchain_record_opt(arg, callchain); - if (!ret) { - /* Enable data address sampling for DWARF unwind. */ - if (callchain->record_mode =3D=3D CALLCHAIN_DWARF && - !record->record_data_mmap_set) - record->record_data_mmap =3D true; - callchain_debug(callchain); - } - - return ret; -} - -int record_parse_callchain_opt(const struct option *opt, +static int record_parse_callchain_opt(const struct option *opt, const char *arg, int unset) { return record_opts__parse_callchain(opt->value, &callchain_param, arg, un= set); } =20 -int record_callchain_opt(const struct option *opt, - const char *arg __maybe_unused, - int unset __maybe_unused) +static int record_callchain_opt(const struct option *opt, + const char *arg __maybe_unused, + int unset) { - struct callchain_param *callchain =3D opt->value; - - callchain->enabled =3D true; - - if (callchain->record_mode =3D=3D CALLCHAIN_NONE) - callchain->record_mode =3D CALLCHAIN_FP; + /* The -g option only sets the callchain if not already configure by .per= fconfig. */ + if (callchain_param.record_mode !=3D CALLCHAIN_NONE) + return 0; =20 - callchain_debug(callchain); - return 0; + return record_opts__parse_callchain(opt->value, &callchain_param, "fp", u= nset); } =20 + static int perf_record_config(const char *var, const char *value, void *cb) { struct record *rec =3D cb; @@ -3525,7 +3485,7 @@ static struct option __record_options[] =3D { OPT_CALLBACK(0, "mmap-flush", &record.opts, "number", "Minimal number of bytes that is extracted from mmap data pages (de= fault: 1)", record__mmap_flush_parse), - OPT_CALLBACK_NOOPT('g', NULL, &callchain_param, + OPT_CALLBACK_NOOPT('g', NULL, &record.opts, NULL, "enables call-graph recording" , &record_callchain_opt), OPT_CALLBACK(0, "call-graph", &record.opts, diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 710604c4f6f6..5d2587228975 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -1386,13 +1386,6 @@ static int __cmd_top(struct perf_top *top) return ret; } =20 -static int -callchain_opt(const struct option *opt, const char *arg, int unset) -{ - symbol_conf.use_callchain =3D true; - return record_callchain_opt(opt, arg, unset); -} - static int parse_callchain_opt(const struct option *opt, const char *arg, int unset) { @@ -1413,6 +1406,19 @@ parse_callchain_opt(const struct option *opt, const = char *arg, int unset) return parse_callchain_top_opt(arg); } =20 +static int +callchain_opt(const struct option *opt, const char *arg __maybe_unused, in= t unset) +{ + struct callchain_param *callchain =3D opt->value; + + /* The -g option only sets the callchain if not already configure by .per= fconfig. */ + if (callchain->record_mode !=3D CALLCHAIN_NONE) + return 0; + + return parse_callchain_opt(opt, "fp", unset); +} + + static int perf_top_config(const char *var, const char *value, void *cb __= maybe_unused) { if (!strcmp(var, "top.call-graph")) { diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 1c38f3d16a31..f487fbaa0ad6 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -5300,6 +5300,13 @@ static int trace__parse_summary_mode(const struct op= tion *opt, const char *str, return 0; } =20 +static int trace_parse_callchain_opt(const struct option *opt, + const char *arg, + int unset) +{ + return record_opts__parse_callchain(opt->value, &callchain_param, arg, un= set); +} + static int trace__config(const char *var, const char *value, void *arg) { struct trace *trace =3D arg; @@ -5447,7 +5454,7 @@ int cmd_trace(int argc, const char **argv) OPT_BOOLEAN('f', "force", &trace.force, "don't complain, do it"), OPT_CALLBACK(0, "call-graph", &trace.opts, "record_mode[,record_size]", record_callchain_help, - &record_parse_callchain_opt), + &trace_parse_callchain_opt), OPT_BOOLEAN(0, "libtraceevent_print", &trace.libtraceevent_print, "Use libtraceevent to print the tracepoint arguments."), OPT_BOOLEAN(0, "kernel-syscall-graph", &trace.kernel_syscallchains, diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c index 8ff0898799ee..f879b84f8ff9 100644 --- a/tools/perf/util/callchain.c +++ b/tools/perf/util/callchain.c @@ -30,6 +30,7 @@ #include "map.h" #include "callchain.h" #include "branch.h" +#include "record.h" #include "symbol.h" #include "thread.h" #include "util.h" @@ -170,7 +171,7 @@ static int get_stack_size(const char *str, unsigned lon= g *_size) static int __parse_callchain_report_opt(const char *arg, bool allow_record_opt) { - char *tok; + char *tok, *arg_copy; char *endptr, *saveptr =3D NULL; bool minpcnt_set =3D false; bool record_opt_set =3D false; @@ -182,12 +183,17 @@ __parse_callchain_report_opt(const char *arg, bool al= low_record_opt) if (!arg) return 0; =20 - while ((tok =3D strtok_r((char *)arg, ",", &saveptr)) !=3D NULL) { + arg_copy =3D strdup(arg); + if (!arg_copy) + return -ENOMEM; + + tok =3D strtok_r(arg_copy, ",", &saveptr); + while (tok) { if (!strncmp(tok, "none", strlen(tok))) { callchain_param.mode =3D CHAIN_NONE; callchain_param.enabled =3D false; symbol_conf.use_callchain =3D false; - return 0; + goto out; } =20 if (!parse_callchain_mode(tok) || @@ -214,30 +220,35 @@ __parse_callchain_report_opt(const char *arg, bool al= low_record_opt) unsigned long size =3D 0; =20 if (get_stack_size(tok, &size) < 0) - return -1; + goto err_out; callchain_param.dump_size =3D size; try_stack_size =3D false; } else if (!minpcnt_set) { /* try to get the min percent */ callchain_param.min_percent =3D strtod(tok, &endptr); if (tok =3D=3D endptr) - return -1; + goto err_out; minpcnt_set =3D true; } else { /* try print limit at last */ callchain_param.print_limit =3D strtoul(tok, &endptr, 0); if (tok =3D=3D endptr) - return -1; + goto err_out; } next: - arg =3D NULL; + tok =3D strtok_r(NULL, ",", &saveptr); } =20 if (callchain_register_param(&callchain_param) < 0) { pr_err("Can't register callchain params\n"); - return -1; + goto err_out; } +out: + free(arg_copy); return 0; +err_out: + free(arg_copy); + return -1; } =20 int parse_callchain_report_opt(const char *arg) @@ -257,14 +268,12 @@ int parse_callchain_record(const char *arg, struct ca= llchain_param *param) int ret =3D -1; =20 /* We need buffer that we know we can write to. */ - buf =3D malloc(strlen(arg) + 1); + buf =3D strdup(arg); if (!buf) return -ENOMEM; =20 - strcpy(buf, arg); - - tok =3D strtok_r((char *)buf, ",", &saveptr); - name =3D tok ? : (char *)buf; + tok =3D strtok_r(buf, ",", &saveptr); + name =3D tok ? : buf; =20 do { /* Framepointer style */ @@ -328,6 +337,44 @@ int parse_callchain_record(const char *arg, struct cal= lchain_param *param) return ret; } =20 +static void callchain_debug(const struct callchain_param *callchain) +{ + static const char *str[CALLCHAIN_MAX] =3D { "NONE", "FP", "DWARF", "LBR" = }; + + pr_debug("callchain: type %s\n", str[callchain->record_mode]); + + if (callchain->record_mode =3D=3D CALLCHAIN_DWARF) + pr_debug("callchain: stack dump size %d\n", + callchain->dump_size); +} + +int record_opts__parse_callchain(struct record_opts *record, + struct callchain_param *callchain, + const char *arg, bool unset) +{ + int ret; + + callchain->enabled =3D !unset; + + /* --no-call-graph */ + if (unset) { + callchain->record_mode =3D CALLCHAIN_NONE; + pr_debug("callchain: disabled\n"); + return 0; + } + + ret =3D parse_callchain_record_opt(arg, callchain); + if (!ret) { + /* Enable data address sampling for DWARF unwind. */ + if (callchain->record_mode =3D=3D CALLCHAIN_DWARF && + !record->record_data_mmap_set) + record->record_data_mmap =3D true; + callchain_debug(callchain); + } + + return ret; +} + int perf_callchain_config(const char *var, const char *value) { char *endptr; diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h index df54ddb8c0cb..06d463ccc7a0 100644 --- a/tools/perf/util/callchain.h +++ b/tools/perf/util/callchain.h @@ -9,11 +9,13 @@ =20 struct addr_location; struct evsel; +struct hist_entry; +struct hists; struct ip_callchain; struct map; struct perf_sample; +struct record_opts; struct thread; -struct hists; =20 #define HELP_PAD "\t\t\t\t" =20 @@ -237,14 +239,6 @@ struct callchain_cursor *get_tls_callchain_cursor(void= ); int callchain_cursor__copy(struct callchain_cursor *dst, struct callchain_cursor *src); =20 -struct option; -struct hist_entry; - -int record_parse_callchain_opt(const struct option *opt, const char *arg, = int unset); -int record_callchain_opt(const struct option *opt, const char *arg, int un= set); - -struct record_opts; - int record_opts__parse_callchain(struct record_opts *record, struct callchain_param *callchain, const char *arg, bool unset); --=20 2.53.0.851.ga537e3e6e9-goog