[インデックス 14848] ファイルの概要
コミット
commit 7847f328cd583231fc6bed6e7ddf7704b204d813
Author: Dmitriy Vyukov <dvyukov@google.com>
Date: Thu Jan 10 11:36:40 2013 +0400
runtime: faster segmented stacks
benchmark old ns/op new ns/op delta
BenchmarkStackGrowth 665 548 -17.59%
BenchmarkStackGrowth-2 333 274 -17.72%
BenchmarkStackGrowth-4 224 168 -25.00%
BenchmarkStackGrowth-8 124 91 -26.21%
BenchmarkStackGrowth-16 82 70 -14.55%
BenchmarkStackGrowth-32 73 59 -19.49%
R=nigeltao, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/7026044
GitHub上でのコミットページへのリンク
https://github.com/golang/go/commit/7847f328cd583231fc6bed6e7ddf7704b204d813
元コミット内容
このコミットは、Goランタイムにおけるセグメント化されたスタックのパフォーマンスを向上させることを目的としています。コミットメッセージには、BenchmarkStackGrowth ベンチマークの結果が示されており、スタックの成長に関連する操作の実行時間が大幅に短縮されていることがわかります。具体的には、最大で約26%の性能改善が報告されています。
変更の背景
Go言語の初期バージョンでは、Goroutineのスタックは「セグメント化されたスタック（segmented stacks）」と呼ばれる方式で管理されていました。これは、スタックが必要に応じて小さなセグメント（チャンク）に分割され、必要に応じて新しいセグメントが割り当てられたり、不要になったセグメントが解放されたりする仕組みです。この方式の利点は、スタックの初期サイズを小さく保ちつつ、必要に応じて動的に拡張できるため、多数のGoroutineを効率的に起動できる点にありました。
しかし、セグメント化されたスタックには、スタックの拡張（stack growth）や縮小（stack shrink）が発生する際に、既存のスタックフレームを新しいスタックセグメントにコピーするオーバーヘッドが伴うという欠点がありました。特に、関数呼び出しが深くネストされたり、再帰的な処理が行われたりする場合、頻繁なスタックの切り替えが発生し、これがパフォーマンスのボトルネックとなる可能性がありました。
このコミットは、このようなスタックの成長・縮小に伴うオーバーヘッドを削減し、全体的なランタイム性能を向上させることを目的としています。ベンチマーク結果が示すように、スタック操作の効率化が図られています。
前提知識の解説
Goroutineとスタック
Go言語のGoroutineは、軽量な並行処理の単位です。各Goroutineは独自のスタックを持っています。このスタックは、関数のローカル変数、引数、戻りアドレスなどを格納するために使用されます。
セグメント化されたスタック (Segmented Stacks)
セグメント化されたスタックは、スタックを固定サイズのチャンク（セグメント）に分割して管理する方式です。
- 初期サイズ: Goroutineの起動時に割り当てられるスタックの初期サイズは比較的小さく設定されます。
- 動的拡張: 関数呼び出しによってスタックが不足しそうになると、新しいスタックセグメントが割り当てられ、既存のスタックの内容が新しいセグメントにコピーされます。このプロセスを「スタックの成長（stack growth）」と呼びます。
- 動的縮小: スタックの使用量が減ると、不要になったセグメントが解放され、スタックが縮小されます。これを「スタックの縮小（stack shrink）」と呼びます。
この方式は、スタックの最大サイズを事前に決定する必要がなく、メモリを効率的に利用できるという利点があります。しかし、スタックの成長・縮小時にはメモリコピーが発生するため、そのオーバーヘッドが性能に影響を与える可能性があります。
runtime パッケージ
Go言語の runtime パッケージは、ガベージコレクション、スケジューリング、Goroutine管理、メモリ割り当てなど、Goプログラムの実行環境を制御する低レベルな機能を提供します。このコミットで変更されている src/pkg/runtime/malloc.goc と src/pkg/runtime/proc.c は、Goランタイムのコア部分を構成するC言語のソースファイルです。
memmove と memcpy
memmove と memcpy は、C言語の標準ライブラリ関数で、メモリブロックのコピーを行います。
memcpy: コピー元とコピー先のメモリ領域が重なっていないことを前提とします。重なっている場合に未定義の動作を引き起こす可能性があります。memmove: コピー元とコピー先のメモリ領域が重なっていても正しく動作することを保証します。内部的には、重なりを考慮してコピーの方向を調整します。
スタックのコピーでは、古いスタックの内容を新しいスタック領域に移動させる際に、メモリ領域が重なる可能性があるため、memmove のような安全なコピー関数が通常使用されます。
技術的詳細
このコミットの主な変更点は、スタックの成長・縮小時に行われるメモリコピーの最適化と、スタック関連の処理ロジックの改善です。
src/pkg/runtime/malloc.goc の変更
runtime/malloc.goc は、Goランタイムのメモリ割り当てと解放に関連する関数を定義しています。このファイルでは、runtime·stackalloc と runtime·stackfree 関数の条件式の順序が変更されています。
--- a/src/pkg/runtime/malloc.goc
+++ b/src/pkg/runtime/malloc.goc
@@ -829,7 +829,7 @@ runtime·stackalloc(uint32 n)
// allocator, assuming that inside malloc all the stack
// frames are small, so that all the stack allocations
// will be a single size, the minimum (right now, 5k).\n- if(m->mallocing || m->gcing || n == FixedStack) {
+\tif(n == FixedStack || m->mallocing || m->gcing) {
if(n != FixedStack) {
runtime·printf("stackalloc: in malloc, size=%d want %d", FixedStack, n);
runtime·throw("stackalloc");
@@ -852,7 +852,7 @@ runtime·stackfree(void *v, uintptr n)
{
uint32 pos;
-\tif(m->mallocing || m->gcing || n == FixedStack) {
+\tif(n == FixedStack || m->mallocing || m->gcing) {
if(m->stackcachecnt == StackCacheSize)
stackcacherelease();
pos = m->stackcachepos;
変更前は m->mallocing || m->gcing || n == FixedStack であった条件が、変更後には n == FixedStack || m->mallocing || m->gcing となっています。これは、n == FixedStack が最も頻繁に評価される可能性のある条件であるため、その評価順序を早めることで、わずかながらもパフォーマンスの改善を狙ったマイクロ最適化と考えられます。FixedStack は、Goランタイムが内部的に使用する固定サイズのスタックを指します。
src/pkg/runtime/proc.c の変更
runtime/proc.c は、Goroutineのスケジューリング、スタック管理、システムコールとの連携など、プロセスの低レベルな側面を扱います。このファイルにおける変更はより広範で、特に runtime·oldstack と runtime·newstack 関数に集中しています。これらの関数は、それぞれスタックの縮小と成長の際に呼び出されます。
runtime·oldstack の変更
runtime·oldstack は、スタックが縮小される際に呼び出される関数です。
--- a/src/pkg/runtime/proc.c
+++ b/src/pkg/runtime/proc.c
@@ -1093,10 +1093,12 @@ runtime·exitsyscall(void)
void
runtime·oldstack(void)
{
-\tStktop *top, old;\n+\tStktop *top;\n+\tGobuf label;\n \tuint32 argsize;\n \tuintptr cret;\n-\tbyte *sp;\n+\tbyte *sp, *old;\n+\tuintptr *src, *dst, *dstend;\n \tG *gp;\n \tint64 goid;\n \n@@ -1104,24 +1106,29 @@ runtime·oldstack(void)
\n \tgp = m->curg;\n \ttop = (Stktop*)gp->stackbase;\n+\told = (byte*)gp->stackguard - StackGuard;\n \tsp = (byte*)top;\n-\told = *top;\n-\targsize = old.argsize;\n+\targsize = top->argsize;\n \tif(argsize > 0) {\n \t\tsp -= argsize;\n-\t\truntime·memmove(top->argp, sp, argsize);\n+\t\tdst = (uintptr*)top->argp;\n+\t\tdstend = dst + argsize/sizeof(*dst);\n+\t\tsrc = (uintptr*)sp;\n+\t\twhile(dst < dstend)\n+\t\t\t*dst++ = *src++;\n \t}\n-\tgoid = old.gobuf.g->goid;\t// fault if g is bad, before gogo\n+\tgoid = top->gobuf.g->goid;\t// fault if g is bad, before gogo\n \tUSED(goid);\n \n-\tif(old.free != 0)\n-\t\truntime·stackfree((byte*)gp->stackguard - StackGuard, old.free);\n-\tgp->stackbase = (uintptr)old.stackbase;\n-\tgp->stackguard = (uintptr)old.stackguard;\n+\tlabel = top->gobuf;\n+\tgp->stackbase = (uintptr)top->stackbase;\n+\tgp->stackguard = (uintptr)top->stackguard;\n+\tif(top->free != 0)\n+\t\truntime·stackfree(old, top->free);\n \n \tcret = m->cret;\n \tm->cret = 0; // drop reference\n-\truntime·gogo(&old.gobuf, cret);\n+\truntime·gogo(&label, cret);\n }\n```
主な変更点は以下の通りです。
- `Stktop old;` 変数が削除され、`Gobuf label;` と `byte *old;` が追加されています。これは、スタックトップの情報を直接 `top` ポインタから取得し、`Gobuf` 構造体を直接使用するように変更されたことを示唆しています。
- `runtime·memmove` を使用していた引数コピーの部分が、`while` ループを使った `uintptr` 型のポインタによる手動コピーに置き換えられています。これは、`memmove` の呼び出しオーバーヘッドを削減し、より低レベルで効率的なコピーを実現するための最適化です。特に、`uintptr` のサイズでループを回すことで、アラインメントを考慮しつつ、キャッシュ効率の良いコピーを狙っている可能性があります。
- `runtime·stackfree` の呼び出しで渡す引数が変更されています。以前は `(byte*)gp->stackguard - StackGuard` を渡していましたが、新しい `old` 変数（`gp->stackguard - StackGuard` の値が代入されている）を渡すように変更されています。これは、スタックの解放処理におけるポインタの計算をより明確にし、効率化を図るものです。
- `runtime·gogo` の呼び出しで渡す引数が `&old.gobuf` から `&label` に変更されています。`label` は `top->gobuf` の値が代入されており、これによりスタック切り替えのコンテキストがより直接的に渡されるようになります。
#### `runtime·newstack` の変更
`runtime·newstack` は、スタックが成長する際に呼び出される関数です。
```diff
--- a/src/pkg/runtime/proc.c
+++ b/src/pkg/runtime/proc.c
@@ -1135,18 +1142,16 @@ runtime·newstack(void)
\tint32 framesize, minalloc, argsize;\n \tStktop *top;\n \tbyte *stk, *sp;\n+\tuintptr *src, *dst, *dstend;\n \tG *gp;\n \tGobuf label;\n \tbool reflectcall;\n \tuintptr free;\n \n \tframesize = m->moreframesize;\n-\tminalloc = m->moreframesize_minalloc;\n \targsize = m->moreargsize;\n \tgp = m->curg;\n \n-\tm->moreframesize_minalloc = 0;\n-\n \tif(m->morebuf.sp < gp->stackguard - StackGuard) {\n \t\truntime·printf("runtime: split stack overflow: %p < %p\\n", m->morebuf.sp, gp->stackguard - StackGuard);\n \t\truntime·throw("runtime: split stack overflow");
@@ -1156,12 +1161,17 @@ runtime·newstack(void)
\t\truntime·throw("runtime: stack split argsize");
\t}\n \n+\tminalloc = 0;\n \treflectcall = framesize==1;\n-\tif(reflectcall)\n+\tif(reflectcall) {\n \t\tframesize = 0;\n-\n-\tif(framesize < minalloc)\n-\t\tframesize = minalloc;\n+\t\t// moreframesize_minalloc is only set in runtime·gc(),\n+\t\t// that calls newstack via reflect·call().\n+\t\tminalloc = m->moreframesize_minalloc;\n+\t\tm->moreframesize_minalloc = 0;\n+\t\tif(framesize < minalloc)\n+\t\t\tframesize = minalloc;\n+\t}\n \n \tif(reflectcall && minalloc == 0 && m->morebuf.sp - sizeof(Stktop) - argsize - 32 > gp->stackguard) {\n \t\t// special case: called from reflect.call (framesize==1)\n@@ -1209,7 +1219,11 @@ runtime·newstack(void)
\tsp = (byte*)top;\n \tif(argsize > 0) {\n \t\tsp -= argsize;\n-\t\truntime·memmove(sp, top->argp, argsize);\n+\t\tdst = (uintptr*)sp;\n+\t\tdstend = dst + argsize/sizeof(*dst);\n+\t\tsrc = (uintptr*)top->argp;\n+\t\twhile(dst < dstend)\n+\t\t\t*dst++ = *src++;\n \t}\n \tif(thechar == '5') {\n \t\t// caller would have saved its LR below args.\n```
主な変更点は以下の通りです。
- `minalloc` 変数の初期化と使用方法が変更されています。特に、`reflectcall` の場合にのみ `m->moreframesize_minalloc` を使用し、それ以外の場合は `minalloc` を0に初期化するように変更されています。これにより、リフレクション呼び出し以外の通常のスタック成長パスでの不要な処理が削減されます。
- `runtime·memmove` を使用していた引数コピーの部分が、`runtime·oldstack` と同様に `while` ループを使った `uintptr` 型のポインタによる手動コピーに置き換えられています。これも、メモリコピーの効率化を目的としたものです。
### 全体的な影響
これらの変更は、Goランタイムがスタックの成長と縮小を処理する方法を最適化し、特に頻繁なスタック操作が発生するワークロードにおいて、パフォーマンスの向上をもたらします。`memmove` のような高レベルな関数呼び出しを、より低レベルでインライン化されやすいループによるコピーに置き換えることで、関数呼び出しのオーバーヘッドやコンパイラによる最適化の機会を増やすことが期待されます。
このコミットは、Go言語がセグメント化されたスタックから連続したスタック（contiguous stacks）へと移行する過渡期に行われた最適化の一つである可能性も考えられます。Go 1.2以降では、スタックのコピーオーバーヘッドを削減するために、セグメント化されたスタックから連続したスタックへとスタック管理モデルが変更されました。このコミットは、その変更以前の、セグメント化されたスタックの性能を最大限に引き出すための努力の一環と見ることができます。
## コアとなるコードの変更箇所
### `src/pkg/runtime/malloc.goc`
- `runtime·stackalloc` 関数内の条件式 `if(m->mallocing || m->gcing || n == FixedStack)` が `if(n == FixedStack || m->mallocing || m->gcing)` に変更。
- `runtime·stackfree` 関数内の条件式 `if(m->mallocing || m->gcing || n == FixedStack)` が `if(n == FixedStack || m->mallocing || m->gcing)` に変更。
### `src/pkg/runtime/proc.c`
- `runtime·oldstack` 関数:
- `Stktop old;` の削除と `Gobuf label;`, `byte *old;`, `uintptr *src, *dst, *dstend;` の追加。
- 引数コピーの `runtime·memmove` を `while` ループによる `uintptr` ポインタコピーに置き換え。
- `runtime·stackfree` の引数変更。
- `runtime·gogo` の引数変更。
- `runtime·newstack` 関数:
- `uintptr *src, *dst, *dstend;` の追加。
- `minalloc` の初期化と使用ロジックの変更。
- 引数コピーの `runtime·memmove` を `while` ループによる `uintptr` ポインタコピーに置き換え。
## コアとなるコードの解説
### `src/pkg/runtime/malloc.goc` の変更点
`runtime·stackalloc` と `runtime·stackfree` における条件式の順序変更は、Goランタイムの内部的なスタック割り当て・解放ロジックにおけるマイクロ最適化です。`n == FixedStack` は、ランタイムが内部的に使用する固定サイズのスタックを指し、これが最も頻繁に評価される可能性のある条件であるため、最初に評価することで、残りの条件（`m->mallocing` や `m->gcing`）の評価をスキップできる機会を増やし、わずかながらも効率を向上させます。これは、条件分岐の予測（branch prediction）にも影響を与える可能性があります。
### `src/pkg/runtime/proc.c` の変更点
#### `runtime·oldstack` と `runtime·newstack` におけるメモリコピーの最適化
最も重要な変更は、`runtime·memmove` の呼び出しを、`while` ループと `uintptr` 型のポインタを使った手動コピーに置き換えた点です。
**変更前:**
```c
runtime·memmove(top->argp, sp, argsize); // oldstack
runtime·memmove(sp, top->argp, argsize); // newstack
runtime·memmove は、メモリブロックをコピーするための汎用的な関数であり、内部的には様々なチェックや最適化が行われます。しかし、Goランタイムのようなパフォーマンスが非常に重要な低レベルコードでは、特定のコピーパターンに対してより特化した、オーバーヘッドの少ない実装が求められることがあります。
変更後:
dst = (uintptr*)top->argp; // oldstack
dstend = dst + argsize/sizeof(*dst);
src = (uintptr*)sp;
while(dst < dstend)
*dst++ = *src++;
// newstackも同様
この変更により、以下の利点が考えられます。
- 関数呼び出しオーバーヘッドの削減:
runtime·memmoveの関数呼び出しがなくなるため、呼び出しスタックのプッシュ/ポップ、引数の渡しなどのオーバーヘッドが削減されます。 - インライン化の促進: コンパイラがこのループをより容易にインライン化できるようになり、コードが直接呼び出し元に展開されることで、さらにオーバーヘッドが削減され、レジスタ割り当てなどの最適化が促進されます。
- キャッシュ効率の向上:
uintptr単位でのコピーは、CPUのワードサイズに合わせたアクセスとなり、キャッシュラインの効率的な利用につながる可能性があります。 - 不要なチェックの回避:
memmoveが行う汎用的な重なりチェックなどが、この特定のスタックコピーのコンテキストでは不要である場合、それらのチェックをスキップすることで効率が向上します。
minalloc のロジック変更 (runtime·newstack)
minalloc のロジック変更は、特にリフレクション呼び出し（reflect.call）を介して newstack が呼び出される場合の挙動を調整しています。以前は常に m->moreframesize_minalloc を minalloc に設定していましたが、変更後は reflectcall の場合にのみこの値を考慮し、それ以外の場合は minalloc を0に設定しています。これにより、通常のスタック成長パスでは不要な minalloc の計算や考慮を省き、コードパスを簡素化し、効率を向上させています。m->moreframesize_minalloc は、ガベージコレクション中に runtime·gc() から newstack が呼び出される際に設定される値であり、特定のシナリオでのみ関連します。
これらの変更は、Goランタイムのスタック管理における細かな最適化の積み重ねであり、全体的なGoroutineの起動・実行性能に寄与します。
関連リンク
- Go言語のスタック管理に関する議論（Go 1.2での連続スタックへの移行など）:
- [Go 1.2 Stack Implementation](https://docs.google.com/document/d/1y_JqXj_d4P-202y-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-222-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