lscpu: add max MHz value to make cpu governor effects more visible

The existing 'CPU MHz' is usually dynamic value, which CPU governor
changes up on needs of CPU demand.  Assuming lscpu is used to gather
information to a hardware inventory the dynamic value is misleading.  For
inventing the maximum MHz value is more sensible.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

1 files changed, 25 insertions, 1 deletions

diff --git a/sys-utils/lscpu.c b/sys-utils/lscpu.c
index dde227b48..fbaaa3136 100644
--- a/sys-utils/lscpu.c
+++ b/sys-utils/lscpu.c
@@ -148,6 +148,7 @@ struct lscpu_desc {
 	int	hyper;		/* hypervisor vendor ID */
 	int	virtype;	/* VIRT_PARA|FULL|NONE ? */
 	char	*mhz;
+	char	**mmhz;		/* maximum mega hertz */
 	char	*stepping;
 	char    *bogomips;
 	char	*flags;
@@ -230,6 +231,7 @@ enum {
 	COL_ADDRESS,
 	COL_CONFIGURED,
 	COL_ONLINE,
+	COL_MMHZ,
 };
 
 /* column description
@@ -252,7 +254,8 @@ static struct lscpu_coldesc coldescs[] =
 	[COL_POLARIZATION] = { "POLARIZATION", N_("CPU dispatching mode on virtual hardware") },
 	[COL_ADDRESS]      = { "ADDRESS", N_("physical address of a CPU") },
 	[COL_CONFIGURED]   = { "CONFIGURED", N_("shows if the hypervisor has allocated the CPU") },
-	[COL_ONLINE]       = { "ONLINE", N_("shows if Linux currently makes use of the CPU") }
+	[COL_ONLINE]       = { "ONLINE", N_("shows if Linux currently makes use of the CPU") },
+	[COL_MMHZ]	   = { "MMHZ", N_("shows the maximum mhz of the CPU") }
 };
 
 static int
@@ -777,6 +780,18 @@ read_configured(struct lscpu_desc *desc, int num)
 	desc->configured[num] = path_read_s32(_PATH_SYS_CPU "/cpu%d/configure", num);
 }
 
+static void
+read_max_mhz(struct lscpu_desc *desc, int num)
+{
+	if (!path_exist(_PATH_SYS_CPU "/cpu%d/cpufreq/cpuinfo_max_freq", num))
+		return;
+	if (!desc->mmhz)
+		desc->mmhz = xcalloc(desc->ncpuspos, sizeof(char *));
+	xasprintf(&(desc->mmhz[num]), "%.4f",
+		  (float)path_read_s32(_PATH_SYS_CPU
+				       "/cpu%d/cpufreq/cpuinfo_max_freq", num) / 1000);
+}
+
 static int
 cachecmp(const void *a, const void *b)
 {
@@ -965,6 +980,10 @@ get_cell_data(struct lscpu_desc *desc, int cpu, int col,
 			snprintf(buf, bufsz,
 				 is_cpu_online(desc, cpu) ? _("yes") : _("no"));
 		break;
+	case COL_MMHZ:
+		if (desc->mmhz)
+			xstrncpy(buf, desc->mmhz[cpu], bufsz);
+		break;
 	}
 	return buf;
 }
@@ -1272,6 +1291,8 @@ print_summary(struct lscpu_desc *desc, struct lscpu_modifier *mod)
 		print_s(_("Stepping:"), desc->stepping);
 	if (desc->mhz)
 		print_s(_("CPU MHz:"), desc->mhz);
+	if (desc->mmhz)
+		print_s(_("CPU max MHz:"), desc->mmhz[0]);
 	if (desc->bogomips)
 		print_s(_("BogoMIPS:"), desc->bogomips);
 	if (desc->virtflag) {
@@ -1439,6 +1460,7 @@ int main(int argc, char *argv[])
 		read_polarization(desc, i);
 		read_address(desc, i);
 		read_configured(desc, i);
+		read_max_mhz(desc, i);
 	}
 
 	if (desc->caches)
@@ -1485,6 +1507,8 @@ int main(int argc, char *argv[])
 				columns[ncolumns++] = COL_POLARIZATION;
 			if (desc->addresses)
 				columns[ncolumns++] = COL_ADDRESS;
+			if (desc->mmhz)
+				columns[ncolumns++] = COL_MMHZ;
 		}
 		print_readable(desc, columns, ncolumns, mod);
 		break;