Commit 03331233 authored by Chen Yu's avatar Chen Yu Committed by Len Brown
Browse files

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: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: default avatarChen Yu <yu.c.chen@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent fb5e29df

tools/power/x86/turbostat/turbostat.c

+26 −1
Original line number Diff line number Diff line
@@ -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();