Public bug reported:
When thermald updates /sys/devices/virtual/powercap/intel-rapl/intel-
rapl:0/constraint_0_power_limit_uw the kernel is emitting the following
message:
[38458.753468] powercap intel-rapl:0: package locked by BIOS, monitoring only
[38637.993447] powercap intel-rapl:0: package locked by BIOS, monitoring only
[38674.154336] powercap intel-rapl:0: package locked by BIOS, monitoring only
[38691.500619] powercap intel-rapl:0: package locked by BIOS, monitoring only
This message comes from set_power_limit() in
drivers/powercap/intel_rapl.c because the domain is locked by the BIOS.
Writing to this interface fails with an error:
open("/sys/devices/virtual/powercap/intel-rapl/intel-rapl:0/constraint_0_power_limit_uw",
O_WRONLY) = 3
write(3, "35000000", 8) = -1 ENODATA (No data available)
so in theory thermald should be seeing this failed write and handling it
appropriately rather.
cthd_sysfs_cdev_rapl::set_curr_state() and
cthd_sysfs_cdev_rapl::set_curr_state_raw() in src/thd_cdev_rapl.cpp
perform the update and they do check that the sysfs write fails:
if (cdev_sysfs.write(tc_state_dev.str(), state_str.str()) < 0)
curr_state = (state == 0) ? 0 : max_state;
however, I believe they should check errno for the failed write and
disable the rapl interface if we get -ENODATA on this interface to avoid
repeated failures and hence repeated spamming of kernel messages
** Affects: thermald (Ubuntu)
Importance: Medium
Assignee: Colin Ian King (colin-king)
Status: In Progress
** Changed in: thermald (Ubuntu)
Status: New => In Progress
** Changed in: thermald (Ubuntu)
Importance: Undecided => Medium
** Changed in: thermald (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
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https://bugs.launchpad.net/bugs/1543046
Title:
thermald spamming kernel log when updating powercap RAPL powerlimit
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