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authorChen Yu <yu.c.chen@intel.com>2022-04-21 17:38:34 +0300
committerLen Brown <len.brown@intel.com>2022-07-28 21:23:25 +0300
commit033312336d67a2ca9b5ff4ad35e5dfd99042d2a3 (patch)
tree9f02f086015d71a1785153cf8be32e5574253f25 /tools/power
parentfb5e29df8d15a131a02a4e04bbd9df8450eecc7d (diff)
downloadlinux-033312336d67a2ca9b5ff4ad35e5dfd99042d2a3.tar.xz
tools/power turbostat: print the kernel boot commandline
It would be handy to have cmdline in turbostat output. For example, according to the turbostat output, there are no C-states requested. In this case the user is very curious if something like intel_idle.max_cstate=0 was used, or may be idle=none too. It is also curious whether things like intel_pstate=nohwp were used. Print the boot command line accordingly: turbostat version 21.05.04 - Len Brown <lenb@kernel.org> Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.16.0+ root=UUID= b42359ed-1e05-42eb-8757-6bf2a1c19070 ro quiet splash vt.handoff=7 Suggested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Chen Yu <yu.c.chen@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'tools/power')
-rw-r--r--tools/power/x86/turbostat/turbostat.c27
1 files changed, 26 insertions, 1 deletions
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index ab45a2e1a70a..318e971c55a1 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -6132,6 +6132,29 @@ void print_version()
fprintf(outf, "turbostat version 2022.04.16 - Len Brown <lenb@kernel.org>\n");
}
+#define COMMAND_LINE_SIZE 2048
+
+void print_bootcmd(void)
+{
+ char bootcmd[COMMAND_LINE_SIZE];
+ FILE *fp;
+ int ret;
+
+ memset(bootcmd, 0, COMMAND_LINE_SIZE);
+ fp = fopen("/proc/cmdline", "r");
+ if (!fp)
+ return;
+
+ ret = fread(bootcmd, sizeof(char), COMMAND_LINE_SIZE - 1, fp);
+ if (ret) {
+ bootcmd[ret] = '\0';
+ /* the last character is already '\n' */
+ fprintf(outf, "Kernel command line: %s", bootcmd);
+ }
+
+ fclose(fp);
+}
+
int add_counter(unsigned int msr_num, char *path, char *name,
unsigned int width, enum counter_scope scope,
enum counter_type type, enum counter_format format, int flags)
@@ -6603,8 +6626,10 @@ int main(int argc, char **argv)
outf = stderr;
cmdline(argc, argv);
- if (!quiet)
+ if (!quiet) {
print_version();
+ print_bootcmd();
+ }
probe_sysfs();