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tools/power turbostat: modprobe msr, if needed

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Some distros (Ubuntu) ship the msr driver as a module.
If turbosat is run as root on those systems, and discovers
that there is no /dev/cpu/cpu0/msr, it will now "modprobe msr"
for the user.

If not root, the modprobe attempt will fail, and turbostat will exit as before:

turbostat: no /dev/cpu/0/msr, Try "# modprobe msr" : No such file or directory

Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2015-03-24 16:37:35 -04:00
parent fcd17211bd
commit a21d38c846
1 changed files with 3 additions and 2 deletions
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5
tools/power/x86/turbostat/turbostat.c
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@ -1528,7 +1528,8 @@ void check_dev_msr()
struct stat sb; struct stat sb;
if (stat("/dev/cpu/0/msr", &sb)) if (stat("/dev/cpu/0/msr", &sb))
err(-5, "no /dev/cpu/0/msr, Try \"# modprobe msr\" "); if (system("/sbin/modprobe msr > /dev/null 2>&1"))
err(-5, "no /dev/cpu/0/msr, Try \"# modprobe msr\" ");
} }
void check_permissions() void check_permissions()
@ -2713,7 +2714,7 @@ int get_and_dump_counters(void)
} }
void print_version() { void print_version() {
fprintf(stderr, "turbostat version 4.2 23 Mar, 2015" fprintf(stderr, "turbostat version 4.3 24 Mar, 2015"
" - Len Brown <lenb@kernel.org>\n"); " - Len Brown <lenb@kernel.org>\n");
} }