X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/ae34fb3db3c082d529a3e9a75698094409d70321..d137cbc6cfdcc541216e68d414c535626e4d8916:/services/keepstore/bufferpool.go

diff --git a/services/keepstore/bufferpool.go b/services/keepstore/bufferpool.go
index 0b216d76bf..9a3509424a 100644
--- a/services/keepstore/bufferpool.go
+++ b/services/keepstore/bufferpool.go
@@ -3,12 +3,15 @@ package main
 import (
 	"log"
 	"sync"
+	"sync/atomic"
 	"time"
 )
 
 type bufferPool struct {
 	// limiter has a "true" placeholder for each in-use buffer.
 	limiter chan bool
+	// allocated is the number of bytes currently allocated to buffers.
+	allocated uint64
 	// Pool has unused buffers.
 	sync.Pool
 }
@@ -16,6 +19,7 @@ type bufferPool struct {
 func newBufferPool(count int, bufSize int) *bufferPool {
 	p := bufferPool{}
 	p.New = func() interface{} {
+		atomic.AddUint64(&p.allocated, uint64(bufSize))
 		return make([]byte, bufSize)
 	}
 	p.limiter = make(chan bool, count)
@@ -39,8 +43,21 @@ func (p *bufferPool) Get(size int) []byte {
 }
 
 func (p *bufferPool) Put(buf []byte) {
-	if buf != nil {
-		p.Pool.Put(buf)
-		<-p.limiter
-	}
+	p.Pool.Put(buf)
+	<-p.limiter
+}
+
+// Alloc returns the number of bytes allocated to buffers.
+func (p *bufferPool) Alloc() uint64 {
+	return atomic.LoadUint64(&p.allocated)
+}
+
+// Cap returns the maximum number of buffers allowed.
+func (p *bufferPool) Cap() int {
+	return cap(p.limiter)
+}
+
+// Len returns the number of buffers in use right now.
+func (p *bufferPool) Len() int {
+	return len(p.limiter)
 }