diff options
author | H. Peter Anvin <hpa@zytor.com> | 2008-09-04 08:08:42 -0700 |
---|---|---|
committer | H. Peter Anvin <hpa@zytor.com> | 2008-09-04 08:08:42 -0700 |
commit | 7203781c98ad9147564d327de6f6513ad8fc0f4e (patch) | |
tree | 5c29a2a04a626bf08a0d56fd8a0068b3c92ad284 /drivers/cpuidle/governors/ladder.c | |
parent | 671eef85a3e885dff4ce210d8774ad50a91d5967 (diff) | |
parent | af2e1f276ff08f17192411ea3b71c13a758dfe12 (diff) |
Merge branch 'x86/cpu' into x86/core
Conflicts:
arch/x86/kernel/cpu/feature_names.c
include/asm-x86/cpufeature.h
Diffstat (limited to 'drivers/cpuidle/governors/ladder.c')
-rw-r--r-- | drivers/cpuidle/governors/ladder.c | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/drivers/cpuidle/governors/ladder.c b/drivers/cpuidle/governors/ladder.c index ba7b9a6b17a..a4bec3f919a 100644 --- a/drivers/cpuidle/governors/ladder.c +++ b/drivers/cpuidle/governors/ladder.c @@ -67,10 +67,17 @@ static int ladder_select_state(struct cpuidle_device *dev) struct ladder_device *ldev = &__get_cpu_var(ladder_devices); struct ladder_device_state *last_state; int last_residency, last_idx = ldev->last_state_idx; + int latency_req = pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY); if (unlikely(!ldev)) return 0; + /* Special case when user has set very strict latency requirement */ + if (unlikely(latency_req == 0)) { + ladder_do_selection(ldev, last_idx, 0); + return 0; + } + last_state = &ldev->states[last_idx]; if (dev->states[last_idx].flags & CPUIDLE_FLAG_TIME_VALID) @@ -81,8 +88,7 @@ static int ladder_select_state(struct cpuidle_device *dev) /* consider promotion */ if (last_idx < dev->state_count - 1 && last_residency > last_state->threshold.promotion_time && - dev->states[last_idx + 1].exit_latency <= - pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY)) { + dev->states[last_idx + 1].exit_latency <= latency_req) { last_state->stats.promotion_count++; last_state->stats.demotion_count = 0; if (last_state->stats.promotion_count >= last_state->threshold.promotion_count) { @@ -92,7 +98,19 @@ static int ladder_select_state(struct cpuidle_device *dev) } /* consider demotion */ - if (last_idx > 0 && + if (last_idx > CPUIDLE_DRIVER_STATE_START && + dev->states[last_idx].exit_latency > latency_req) { + int i; + + for (i = last_idx - 1; i > CPUIDLE_DRIVER_STATE_START; i--) { + if (dev->states[i].exit_latency <= latency_req) + break; + } + ladder_do_selection(ldev, last_idx, i); + return i; + } + + if (last_idx > CPUIDLE_DRIVER_STATE_START && last_residency < last_state->threshold.demotion_time) { last_state->stats.demotion_count++; last_state->stats.promotion_count = 0; @@ -117,7 +135,7 @@ static int ladder_enable_device(struct cpuidle_device *dev) struct ladder_device_state *lstate; struct cpuidle_state *state; - ldev->last_state_idx = 0; + ldev->last_state_idx = CPUIDLE_DRIVER_STATE_START; for (i = 0; i < dev->state_count; i++) { state = &dev->states[i]; |