From 9c08581728ccadc6b9e4135b7b8d31948e814f6f Mon Sep 17 00:00:00 2001 From: Prarit Bhargava Date: Tue, 18 Oct 2022 15:23:37 -0400 Subject: [PATCH] tools/power turbostat: Provide better debug messages for failed capabilities accesses turbostat reports some capabilities access errors and not others. Provide the same debug message for all errors. [lenb: remove extra quotes] Cc: David Arcari Signed-off-by: Prarit Bhargava Signed-off-by: Len Brown --- tools/power/x86/turbostat/turbostat.8 | 2 +- tools/power/x86/turbostat/turbostat.c | 12 ++++++------ 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/tools/power/x86/turbostat/turbostat.8 b/tools/power/x86/turbostat/turbostat.8 index c7b26a3..7dcb4f4 100644 --- a/tools/power/x86/turbostat/turbostat.8 +++ b/tools/power/x86/turbostat/turbostat.8 @@ -340,7 +340,7 @@ starts a new interval. must be run as root. Alternatively, non-root users can be enabled to run turbostat this way: -# setcap cap_sys_admin,cap_sys_rawio,cap_sys_nice=+ep ./turbostat +# setcap cap_sys_admin,cap_sys_rawio,cap_sys_nice=+ep path/to/turbostat # chmod +r /dev/cpu/*/msr diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c index 7ae3086..d246ef6 100644 --- a/tools/power/x86/turbostat/turbostat.c +++ b/tools/power/x86/turbostat/turbostat.c @@ -670,7 +670,8 @@ 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) { - warn("cpu%d: perf instruction counter", cpu_num); + warnx("capget(CAP_PERFMON) failed, try \"# setcap cap_sys_admin=ep %s\"", + progname); BIC_NOT_PRESENT(BIC_IPC); } @@ -3502,9 +3503,6 @@ release_msr: /* * set_my_sched_priority(pri) * return previous - * - * if non-root, do this: - * # /sbin/setcap cap_sys_rawio,cap_sys_nice=+ep /usr/bin/turbostat */ int set_my_sched_priority(int priority) { @@ -3518,7 +3516,8 @@ int set_my_sched_priority(int priority) retval = setpriority(PRIO_PROCESS, 0, priority); if (retval) - err(retval, "setpriority(%d)", priority); + errx(retval, "capget(CAP_SYS_NICE) failed,try \"# setcap cap_sys_nice=ep %s\"", + progname); errno = 0; retval = getpriority(PRIO_PROCESS, 0); @@ -5476,7 +5475,8 @@ void print_dev_latency(void) fd = open(path, O_RDONLY); if (fd < 0) { - warn("fopen %s\n", path); + warnx("capget(CAP_SYS_ADMIN) failed, try \"# setcap cap_sys_admin=ep %s\"", + progname); return; } -- 2.7.4