mirror of
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ce28ec8caa
Summary: check fetch count before `getPriority()` is used. If fetch count has exceeded `fetchThreshold_`, lower the priority by 1. Note: this diff only guarantees that the `getPriority()` function is returning the lowered priority. How the returned value is used for scheduling is handled by `HgQueuedBackingStore` Reviewed By: kmancini Differential Revision: D22550640 fbshipit-source-id: c032f8f72ca658618ac118dfb3ad3dcae61e9735
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#pragma once
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#include <cstdint>
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namespace facebook {
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namespace eden {
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enum class ImportPriorityKind : int16_t { Low = 0, Normal = 1, High = 2 };
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struct ImportPriority {
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ImportPriorityKind kind;
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uint64_t offset : 48;
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static constexpr ImportPriority kLow() {
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return ImportPriority{ImportPriorityKind::Low};
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}
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static constexpr ImportPriority kNormal() {
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return ImportPriority{ImportPriorityKind::Normal};
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}
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static constexpr ImportPriority kHigh() {
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return ImportPriority{ImportPriorityKind::High};
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}
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// set half of the maximum offset as default offset to allow equal
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// space for raising and lowering priority offset.
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explicit constexpr ImportPriority()
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: kind(ImportPriorityKind::Normal), offset(0x7FFFFFFFFFFF) {}
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explicit constexpr ImportPriority(ImportPriorityKind kind)
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: kind(kind), offset(0x7FFFFFFFFFFF) {}
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constexpr ImportPriority(ImportPriorityKind kind, uint64_t offset)
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: kind(kind), offset(offset) {}
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constexpr inline int64_t value() const noexcept {
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return (static_cast<int16_t>(kind) * (static_cast<uint64_t>(1) << 48)) +
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offset;
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}
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/**
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* Deprioritize ImportPriority by decreasing offset by delta.
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* Note: this function maintains ImportPriorityKind, as jobs
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* with higher priority kind are usually designed to be scheduled
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* ealier and should not lower their kind even when deprioritized.
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*/
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constexpr ImportPriority getDeprioritized(uint64_t delta) const noexcept {
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return ImportPriority{kind, offset > delta ? offset - delta : 0};
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}
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friend bool operator<(
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const ImportPriority& lhs,
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const ImportPriority& rhs) noexcept {
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return lhs.value() < rhs.value();
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}
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};
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} // namespace eden
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} // namespace facebook
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