mirror of
https://git.zx2c4.com/wireguard-go
synced 2024-11-14 16:55:15 +01:00
1ec454f253
Queue{In,Out}boundElement locking can contribute to significant
overhead via sync.Mutex.lockSlow() in some environments. These types
are passed throughout the device package as elements in a slice, so
move the per-element Mutex to a container around the slice.
Reviewed-by: Maisem Ali <maisem@tailscale.com>
Signed-off-by: Jordan Whited <jordan@tailscale.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
121 lines
3.1 KiB
Go
121 lines
3.1 KiB
Go
/* SPDX-License-Identifier: MIT
|
|
*
|
|
* Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
|
|
*/
|
|
|
|
package device
|
|
|
|
import (
|
|
"sync"
|
|
"sync/atomic"
|
|
)
|
|
|
|
type WaitPool struct {
|
|
pool sync.Pool
|
|
cond sync.Cond
|
|
lock sync.Mutex
|
|
count atomic.Uint32
|
|
max uint32
|
|
}
|
|
|
|
func NewWaitPool(max uint32, new func() any) *WaitPool {
|
|
p := &WaitPool{pool: sync.Pool{New: new}, max: max}
|
|
p.cond = sync.Cond{L: &p.lock}
|
|
return p
|
|
}
|
|
|
|
func (p *WaitPool) Get() any {
|
|
if p.max != 0 {
|
|
p.lock.Lock()
|
|
for p.count.Load() >= p.max {
|
|
p.cond.Wait()
|
|
}
|
|
p.count.Add(1)
|
|
p.lock.Unlock()
|
|
}
|
|
return p.pool.Get()
|
|
}
|
|
|
|
func (p *WaitPool) Put(x any) {
|
|
p.pool.Put(x)
|
|
if p.max == 0 {
|
|
return
|
|
}
|
|
p.count.Add(^uint32(0))
|
|
p.cond.Signal()
|
|
}
|
|
|
|
func (device *Device) PopulatePools() {
|
|
device.pool.inboundElementsContainer = NewWaitPool(PreallocatedBuffersPerPool, func() any {
|
|
s := make([]*QueueInboundElement, 0, device.BatchSize())
|
|
return &QueueInboundElementsContainer{elems: s}
|
|
})
|
|
device.pool.outboundElementsContainer = NewWaitPool(PreallocatedBuffersPerPool, func() any {
|
|
s := make([]*QueueOutboundElement, 0, device.BatchSize())
|
|
return &QueueOutboundElementsContainer{elems: s}
|
|
})
|
|
device.pool.messageBuffers = NewWaitPool(PreallocatedBuffersPerPool, func() any {
|
|
return new([MaxMessageSize]byte)
|
|
})
|
|
device.pool.inboundElements = NewWaitPool(PreallocatedBuffersPerPool, func() any {
|
|
return new(QueueInboundElement)
|
|
})
|
|
device.pool.outboundElements = NewWaitPool(PreallocatedBuffersPerPool, func() any {
|
|
return new(QueueOutboundElement)
|
|
})
|
|
}
|
|
|
|
func (device *Device) GetInboundElementsContainer() *QueueInboundElementsContainer {
|
|
c := device.pool.inboundElementsContainer.Get().(*QueueInboundElementsContainer)
|
|
c.Mutex = sync.Mutex{}
|
|
return c
|
|
}
|
|
|
|
func (device *Device) PutInboundElementsContainer(c *QueueInboundElementsContainer) {
|
|
for i := range c.elems {
|
|
c.elems[i] = nil
|
|
}
|
|
c.elems = c.elems[:0]
|
|
device.pool.inboundElementsContainer.Put(c)
|
|
}
|
|
|
|
func (device *Device) GetOutboundElementsContainer() *QueueOutboundElementsContainer {
|
|
c := device.pool.outboundElementsContainer.Get().(*QueueOutboundElementsContainer)
|
|
c.Mutex = sync.Mutex{}
|
|
return c
|
|
}
|
|
|
|
func (device *Device) PutOutboundElementsContainer(c *QueueOutboundElementsContainer) {
|
|
for i := range c.elems {
|
|
c.elems[i] = nil
|
|
}
|
|
c.elems = c.elems[:0]
|
|
device.pool.outboundElementsContainer.Put(c)
|
|
}
|
|
|
|
func (device *Device) GetMessageBuffer() *[MaxMessageSize]byte {
|
|
return device.pool.messageBuffers.Get().(*[MaxMessageSize]byte)
|
|
}
|
|
|
|
func (device *Device) PutMessageBuffer(msg *[MaxMessageSize]byte) {
|
|
device.pool.messageBuffers.Put(msg)
|
|
}
|
|
|
|
func (device *Device) GetInboundElement() *QueueInboundElement {
|
|
return device.pool.inboundElements.Get().(*QueueInboundElement)
|
|
}
|
|
|
|
func (device *Device) PutInboundElement(elem *QueueInboundElement) {
|
|
elem.clearPointers()
|
|
device.pool.inboundElements.Put(elem)
|
|
}
|
|
|
|
func (device *Device) GetOutboundElement() *QueueOutboundElement {
|
|
return device.pool.outboundElements.Get().(*QueueOutboundElement)
|
|
}
|
|
|
|
func (device *Device) PutOutboundElement(elem *QueueOutboundElement) {
|
|
elem.clearPointers()
|
|
device.pool.outboundElements.Put(elem)
|
|
}
|