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Merge pull request #19591 from karalabe/64bit-align

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core/rawdb, eth/downloader: align 64bit atomic fields
This commit is contained in:
Péter Szilágyi 2019-05-17 02:13:50 +03:00 committed by GitHub
commit 2f855bfa28
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3 changed files with 17 additions and 5 deletions
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6
core/rawdb/freezer.go
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@ -66,8 +66,12 @@ const (
// reserving it for go-ethereum. This would also reduce the memory requirements // reserving it for go-ethereum. This would also reduce the memory requirements
// of Geth, and thus also GC overhead. // of Geth, and thus also GC overhead.
type freezer struct { type freezer struct {
// WARNING: The `frozen` field is accessed atomically. On 32 bit platforms, only
// 64-bit aligned fields can be atomic. The struct is guaranteed to be so aligned,
// so take advantage of that (https://golang.org/pkg/sync/atomic/#pkg-note-BUG).
frozen uint64 // Number of blocks already frozen
tables map[string]*freezerTable // Data tables for storing everything tables map[string]*freezerTable // Data tables for storing everything
frozen uint64 // Number of blocks already frozen
instanceLock fileutil.Releaser // File-system lock to prevent double opens instanceLock fileutil.Releaser // File-system lock to prevent double opens
} }

6
core/rawdb/freezer_table.go
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@ -73,6 +73,11 @@ func (i *indexEntry) marshallBinary() []byte {
// It consists of a data file (snappy encoded arbitrary data blobs) and an indexEntry // It consists of a data file (snappy encoded arbitrary data blobs) and an indexEntry
// file (uncompressed 64 bit indices into the data file). // file (uncompressed 64 bit indices into the data file).
type freezerTable struct { type freezerTable struct {
// WARNING: The `items` field is accessed atomically. On 32 bit platforms, only
// 64-bit aligned fields can be atomic. The struct is guaranteed to be so aligned,
// so take advantage of that (https://golang.org/pkg/sync/atomic/#pkg-note-BUG).
items uint64 // Number of items stored in the table (including items removed from tail)
noCompression bool // if true, disables snappy compression. Note: does not work retroactively noCompression bool // if true, disables snappy compression. Note: does not work retroactively
maxFileSize uint32 // Max file size for data-files maxFileSize uint32 // Max file size for data-files
name string name string
@ -86,7 +91,6 @@ type freezerTable struct {
// In the case that old items are deleted (from the tail), we use itemOffset // In the case that old items are deleted (from the tail), we use itemOffset
// to count how many historic items have gone missing. // to count how many historic items have gone missing.
items uint64 // Number of items stored in the table (including items removed from tail)
itemOffset uint32 // Offset (number of discarded items) itemOffset uint32 // Offset (number of discarded items)
headBytes uint32 // Number of bytes written to the head file headBytes uint32 // Number of bytes written to the head file

10
eth/downloader/downloader.go
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@ -98,6 +98,13 @@ var (
) )
type Downloader struct { type Downloader struct {
// WARNING: The `rttEstimate` and `rttConfidence` fields are accessed atomically.
// On 32 bit platforms, only 64-bit aligned fields can be atomic. The struct is
// guaranteed to be so aligned, so take advantage of that. For more information,
// see https://golang.org/pkg/sync/atomic/#pkg-note-BUG.
rttEstimate uint64 // Round trip time to target for download requests
rttConfidence uint64 // Confidence in the estimated RTT (unit: millionths to allow atomic ops)
mode SyncMode // Synchronisation mode defining the strategy used (per sync cycle) mode SyncMode // Synchronisation mode defining the strategy used (per sync cycle)
mux *event.TypeMux // Event multiplexer to announce sync operation events mux *event.TypeMux // Event multiplexer to announce sync operation events
@ -109,9 +116,6 @@ type Downloader struct {
stateDB ethdb.Database // Database to state sync into (and deduplicate via) stateDB ethdb.Database // Database to state sync into (and deduplicate via)
stateBloom *trie.SyncBloom // Bloom filter for fast trie node existence checks stateBloom *trie.SyncBloom // Bloom filter for fast trie node existence checks
rttEstimate uint64 // Round trip time to target for download requests
rttConfidence uint64 // Confidence in the estimated RTT (unit: millionths to allow atomic ops)
// Statistics // Statistics
syncStatsChainOrigin uint64 // Origin block number where syncing started at syncStatsChainOrigin uint64 // Origin block number where syncing started at
syncStatsChainHeight uint64 // Highest block number known when syncing started syncStatsChainHeight uint64 // Highest block number known when syncing started