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Message-ID: <Zs977_n0rkleEl94@x1>
Date: Wed, 28 Aug 2024 16:35:11 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Alan Maguire <alan.maguire@...cle.com>,
Andrii Nakryiko <andrii@...nel.org>,
Eduard Zingerman <eddyz87@...il.com>, Jiri Olsa <jolsa@...nel.org>,
dwarves@...r.kernel.org, bpf@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/1] pahole: Add option to obtain a vmlinux matching the
running kernel
To use in regression tests scripts, but in general its a nice utility to
use in other kinds of scripts.
All this matches:
$ pahole --running_kernel_vmlinux
/lib/modules/6.11.0-rc5+/build/vmlinux
$ file `pahole --running_kernel_vmlinux`
/lib/modules/6.11.0-rc5+/build/vmlinux: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=4dd7f9c4507b82a5bf90671d524e5bb308104ffa, with debug_info, not stripped
$ perf buildid-list -k
4dd7f9c4507b82a5bf90671d524e5bb308104ffa
$ perf buildid-list -i /lib/modules/6.11.0-rc5+/build/vmlinux
4dd7f9c4507b82a5bf90671d524e5bb308104ffa
$
Cc: Alan Maguire <alan.maguire@...cle.com>
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: Eduard Zingerman <eddyz87@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
man-pages/pahole.1 | 4 ++++
pahole.c | 24 ++++++++++++++++++++++++
2 files changed, 28 insertions(+)
diff --git a/man-pages/pahole.1 b/man-pages/pahole.1
index 2f623b4e42619114..0a9d8ac49fbf94d5 100644
--- a/man-pages/pahole.1
+++ b/man-pages/pahole.1
@@ -339,6 +339,10 @@ Identical to \-\-btf_features above, but pahole will exit if it encounters an un
.B \-\-supported_btf_features
Show set of BTF features supported by \-\-btf_features option and exit. Useful for checking which features are supported since \-\-btf_features will not emit an error if an unrecognized feature is specified.
+.TP
+.B \-\-running_kernel_vmlinux,
+Search for, possibly getting from a debuginfo server, a vmlinux matching the running kernel build-id (from /sys/kernel/notes).
+
.TP
.B \-l, \-\-show_first_biggest_size_base_type_member
Show first biggest size base_type member.
diff --git a/pahole.c b/pahole.c
index 226361dcf349c777..a33490d698ead7d5 100644
--- a/pahole.c
+++ b/pahole.c
@@ -37,6 +37,7 @@ static bool ctf_encode;
static bool sort_output;
static bool need_resort;
static bool first_obj_only;
+static bool show_running_kernel_vmlinux;
static const char *base_btf_file;
static const char *prettify_input_filename;
@@ -1237,6 +1238,7 @@ ARGP_PROGRAM_VERSION_HOOK_DEF = dwarves_print_version;
#define ARGP_btf_features_strict 343
#define ARGP_contains_enumerator 344
#define ARGP_reproducible_build 345
+#define ARGP_running_kernel_vmlinux 346
/* --btf_features=feature1[,feature2,..] allows us to specify
* a list of requested BTF features or "default" to enable all default
@@ -1851,6 +1853,11 @@ static const struct argp_option pahole__options[] = {
.key = ARGP_reproducible_build,
.doc = "Generate reproducile BTF output"
},
+ {
+ .name = "running_kernel_vmlinux",
+ .key = ARGP_running_kernel_vmlinux,
+ .doc = "Search for, possibly getting from a debuginfo server, a vmlinux matching the running kernel build-id (from /sys/kernel/notes)"
+ },
{
.name = NULL,
}
@@ -2032,6 +2039,8 @@ static error_t pahole__options_parser(int key, char *arg,
conf_load.skip_encoding_btf_inconsistent_proto = true; break;
case ARGP_reproducible_build:
conf_load.reproducible_build = true; break;
+ case ARGP_running_kernel_vmlinux:
+ show_running_kernel_vmlinux = true; break;
case ARGP_btf_features:
parse_btf_features(arg, false); break;
case ARGP_supported_btf_features:
@@ -3707,6 +3716,21 @@ int main(int argc, char *argv[])
goto out;
}
+ if (show_running_kernel_vmlinux) {
+ const char *vmlinux = vmlinux_path__find_running_kernel();
+
+ if (vmlinux) {
+ fprintf(stdout, "%s\n", vmlinux);
+ rc = EXIT_SUCCESS;
+ } else {
+ fputs("pahole: couldn't find a vmlinux that matches the running kernel\n"
+ "HINT: Maybe you're inside a container or missing a debuginfo package?\n",
+ stderr);
+ }
+
+ return rc;
+ }
+
if (languages.str && parse_languages())
return rc;
--
2.46.0
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