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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-03-11 12:57:25 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-03-12 09:47:30 +0100
commit8e3b403954507eb74ad241dc3750443ccc9ee40a (patch)
treeb546aa20878e388292f20875c6bdcbb065b5dc41 /drivers
parent9505b98ccddc454008ca7efff90044e3e857c827 (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.c2
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);