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hwpstate(4): Log a debug line when throttled

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If we're going to throttle user requested P-states, we should at least produce
a debug log line indicating the surprising behavior.

PR:		inspired by 234733
This commit is contained in:
Conrad Meyer 2020-01-27 06:04:32 +00:00
parent 8227d65b72
commit 9ea85092d9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=357165
1 changed files with 5 additions and 1 deletions
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6
sys/x86/cpufreq/hwpstate_amd.c
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@ -173,8 +173,12 @@ hwpstate_goto_pstate(device_t dev, int id)
/* get the current pstate limit */
msr = rdmsr(MSR_AMD_10H_11H_LIMIT);
limit = AMD_10H_11H_GET_PSTATE_LIMIT(msr);
if (limit > id)
if (limit > id) {
HWPSTATE_DEBUG(dev,
"Restricting requested P%d to P%d due to HW limit\n", id,
limit);
id = limit;
}
cpu = curcpu;
HWPSTATE_DEBUG(dev, "setting P%d-state on cpu%d\n", id, cpu);