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structure alignment for 386 #249

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structure alignment for 386 #249

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8 changes: 7 additions & 1 deletion policy.go
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Original file line number Diff line number Diff line change
Expand Up @@ -279,9 +279,15 @@ func (p *defaultPolicy) UpdateMaxCost(maxCost int64) {

// sampledLFU is an eviction helper storing key-cost pairs.
type sampledLFU struct {
keyCosts map[uint64]int64
// NOTE: align maxCost to 64-bit boundary for use with atomic.
// As per https://golang.org/pkg/sync/atomic/: "On ARM, x86-32,
// and 32-bit MIPS, it is the caller’s responsibility to arrange
// for 64-bit alignment of 64-bit words accessed atomically.
// The first word in a variable or in an allocated struct, array,
// or slice can be relied upon to be 64-bit aligned."
maxCost int64
used int64
keyCosts map[uint64]int64
metrics *Metrics
}

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