diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-03-11 12:57:25 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-03-12 09:47:30 +0100 |
| commit | 8e3b403954507eb74ad241dc3750443ccc9ee40a (patch) | |
| tree | b546aa20878e388292f20875c6bdcbb065b5dc41 /drivers | |
| parent | 9505b98ccddc454008ca7efff90044e3e857c827 (diff) | |
cpufreq: intel_pstate: Fix up iowait_boost computation
After commit b8bd1581aa61 ("cpufreq: intel_pstate: Rework iowait
boosting to be less aggressive") the handling of the case when
the SCHED_CPUFREQ_IOWAIT flag is set again after a few iterations of
intel_pstate_update_util() is a bit inconsistent, because the
new value of cpu->iowait_boost may be lower than ONE_EIGHTH_FP
if it was set before, but has not dropped down to zero just yet.
Fix that up by ensuring that the new value of cpu->iowait_boost
will always be at least ONE_EIGHTH_FP then.
Fixes: b8bd1581aa61 ("cpufreq: intel_pstate: Rework iowait boosting to be less aggressive")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 002f5169d4eb..e22f0dbaebb1 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1762,7 +1762,7 @@ static void intel_pstate_update_util(struct update_util_data *data, u64 time, /* Start over if the CPU may have been idle. */ if (delta_ns > TICK_NSEC) { cpu->iowait_boost = ONE_EIGHTH_FP; - } else if (cpu->iowait_boost) { + } else if (cpu->iowait_boost >= ONE_EIGHTH_FP) { cpu->iowait_boost <<= 1; if (cpu->iowait_boost > int_tofp(1)) cpu->iowait_boost = int_tofp(1); |