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scheduler: Update estimate_max_scheduling_latency()

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This commit is contained in:
Pawel Dziepak 2013-11-27 04:15:36 +01:00
parent 7d7dc357bf
commit 9caf7f4fb9
2 changed files with 13 additions and 12 deletions
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23
src/system/kernel/scheduler/scheduler.cpp
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@ -27,6 +27,7 @@
#include <scheduler_defs.h>
#include <smp.h>
#include <timer.h>
#include <util/Random.h>
#include <cpufreq.h>
@ -1768,18 +1769,20 @@ _user_estimate_max_scheduling_latency(thread_id id)
}
BReference<Thread> threadReference(thread, true);
// TODO: This is probably meant to be called periodically to return the
// current estimate depending on the system usage; we return fixed estimates
// per thread priority, though.
int32 core = thread->scheduler_data->previous_core;
if (core == -1)
core = get_random<int32>() % gCoreCount;
if (thread->priority >= B_REAL_TIME_DISPLAY_PRIORITY)
return kMinThreadQuantum / 4;
if (thread->priority >= B_DISPLAY_PRIORITY)
return kMinThreadQuantum;
if (thread->priority < B_NORMAL_PRIORITY)
return 2 * kMaxThreadQuantum;
int32 threadCount = gCoreEntries[core].fThreadCount;
if (gCoreEntries[core].fCPUCount > 0)
threadCount /= gCoreEntries[core].fCPUCount;
return 2 * kMinThreadQuantum;
if (get_effective_priority(thread) > 0) {
threadCount -= threadCount * THREAD_MAX_SET_PRIORITY
/ get_effective_priority(thread);
}
return max_c(threadCount * kThreadQuantum, kThreadQuantum / 5);
}

2
src/system/kernel/scheduler/scheduler_common.h
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@ -30,8 +30,6 @@ namespace Scheduler {
const bigtime_t kThreadQuantum = 1000;
const bigtime_t kMinThreadQuantum = 3000;
const bigtime_t kMaxThreadQuantum = 10000;
const bigtime_t kCacheExpire = 100000;