@@ -69,6 +69,8 @@ The column name "all" can be used to enable all disabled-by-default built-in cou
.PP
+\fB--no-msr\fP Disable all the uses of the MSR driver.
+.PP
++\fB--no-perf\fP Disable all the uses of the perf API.
++.PP
\fB--interval seconds\fP overrides the default 5.0 second measurement interval.
.PP
\fB--num_iterations num\fP number of the measurement iterations.
@@ -267,6 +267,7 @@ unsigned int has_hwp_pkg; /* IA32_HWP_REQUEST_PKG */
unsigned int first_counter_read = 1;
int ignore_stdin;
bool no_msr;
+bool no_perf;
int get_msr(int cpu, off_t offset, unsigned long long *msr);
@@ -1314,8 +1315,17 @@ static void bic_disable_msr_access(void)
bic_enabled &= ~bic_msrs;
}
+static void bic_disable_perf_access(void)
+{
+ const unsigned long bic_perf = BIC_IPC;
+
+ bic_enabled &= ~bic_perf;
+}
+
static long perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu, int group_fd, unsigned long flags)
{
+ assert(!no_perf);
+
return syscall(__NR_perf_event_open, hw_event, pid, cpu, group_fd, flags);
}
@@ -1332,8 +1342,8 @@ static int perf_instr_count_open(int cpu_num)
/* counter for cpu_num, including user + kernel and all processes */
fd = perf_event_open(&pea, -1, cpu_num, -1, 0);
if (fd == -1) {
- warnx("capget(CAP_PERFMON) failed, try \"# setcap cap_sys_admin=ep %s\"", progname);
- BIC_NOT_PRESENT(BIC_IPC);
+ warnx("capget(CAP_PERFMON) failed, try \"# setcap cap_sys_admin=ep %s\" or use --no-perf", progname);
+ bic_disable_perf_access();
}
return fd;
@@ -1399,6 +1409,7 @@ void help(void)
" -J, --Joules displays energy in Joules instead of Watts\n"
" -l, --list list column headers only\n"
" -M, --no-msr Disable all uses of the MSR driver\n"
+ " -P, --no-perf Disable all uses of the perf API\n"
" -n, --num_iterations num\n"
" number of the measurement iterations\n"
" -N, --header_iterations num\n"
@@ -6745,6 +6756,7 @@ void cmdline(int argc, char **argv)
{ "out", required_argument, 0, 'o' },
{ "quiet", no_argument, 0, 'q' },
{ "no-msr", no_argument, 0, 'M' },
+ { "no-perf", no_argument, 0, 'P' },
{ "show", required_argument, 0, 's' },
{ "Summary", no_argument, 0, 'S' },
{ "TCC", required_argument, 0, 'T' },
@@ -6758,11 +6770,14 @@ void cmdline(int argc, char **argv)
* Parse some options early, because they may make other options invalid,
* like adding the MSR counter with --add and at the same time using --no-msr.
*/
- while ((opt = getopt_long_only(argc, argv, "M", long_options, &option_index)) != -1) {
+ while ((opt = getopt_long_only(argc, argv, "MP", long_options, &option_index)) != -1) {
switch (opt) {
case 'M':
no_msr = 1;
break;
+ case 'P':
+ no_perf = 1;
+ break;
default:
break;
}
@@ -6828,6 +6843,7 @@ void cmdline(int argc, char **argv)
quiet = 1;
break;
case 'M':
+ case 'P':
/* Parsed earlier */
break;
case 'n':
@@ -6909,6 +6925,9 @@ int main(int argc, char **argv)
if (no_msr)
bic_disable_msr_access();
+ if (no_perf)
+ bic_disable_perf_access();
+
if (!quiet) {
print_version();
print_bootcmd();