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net: reduce allocation size in ReadFromUDP

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Switch to concrete types. Bring your own object to fill in.

Allocate just enough for the IP byte slice.
The allocation is now just 4 bytes for IPv4,
which puts it in the tiny allocator, which is much faster.

name                  old time/op    new time/op    delta
WriteToReadFromUDP-8    13.7µs ± 1%    13.4µs ± 2%   -2.49%  (p=0.000 n=10+10)

name                  old alloc/op   new alloc/op   delta
WriteToReadFromUDP-8     32.0B ± 0%      4.0B ± 0%  -87.50%  (p=0.000 n=10+10)

name                  old allocs/op  new allocs/op  delta
WriteToReadFromUDP-8      1.00 ± 0%      1.00 ± 0%     ~     (all equal)

Windows is temporarily stubbed out.

Updates #43451

Change-Id: Ief506f891b401d28715d22dce6ebda037941924e
Reviewed-on: https://go-review.googlesource.com/c/go/+/331490
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Trust: Damien Neil <dneil@google.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
This commit is contained in:
Josh Bleecher Snyder 2021-02-11 19:34:22 -08:00 committed by Damien Neil
parent d9349175ad
commit 9c5eb16f6c
8 changed files with 197 additions and 7 deletions
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52
api/next.txt
View File

@ -1,52 +1,104 @@
pkg syscall (darwin-amd64), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (darwin-amd64), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (darwin-amd64), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (darwin-amd64), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (darwin-amd64-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (darwin-amd64-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (darwin-amd64-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (darwin-amd64-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (freebsd-386), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (freebsd-386), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (freebsd-386), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (freebsd-386), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (freebsd-386-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (freebsd-386-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (freebsd-386-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (freebsd-386-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (freebsd-amd64), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (freebsd-amd64), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (freebsd-amd64), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (freebsd-amd64), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (freebsd-amd64-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (freebsd-amd64-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (freebsd-amd64-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (freebsd-amd64-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (freebsd-arm), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (freebsd-arm), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (freebsd-arm), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (freebsd-arm), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (freebsd-arm-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (freebsd-arm-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (freebsd-arm-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (freebsd-arm-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (linux-386), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (linux-386), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (linux-386), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (linux-386), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (linux-386-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (linux-386-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (linux-386-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (linux-386-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (linux-amd64), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (linux-amd64), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (linux-amd64), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (linux-amd64), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (linux-amd64-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (linux-amd64-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (linux-amd64-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (linux-amd64-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (linux-arm), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (linux-arm), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (linux-arm), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (linux-arm), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (linux-arm-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (linux-arm-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (linux-arm-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (linux-arm-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (netbsd-386), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (netbsd-386), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (netbsd-386), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (netbsd-386), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (netbsd-386-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (netbsd-386-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (netbsd-386-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (netbsd-386-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (netbsd-amd64), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (netbsd-amd64), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (netbsd-amd64), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (netbsd-amd64), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (netbsd-amd64-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (netbsd-amd64-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (netbsd-amd64-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (netbsd-amd64-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (netbsd-arm), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (netbsd-arm), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (netbsd-arm), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (netbsd-arm), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (netbsd-arm-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (netbsd-arm-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (netbsd-arm-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (netbsd-arm-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (netbsd-arm64), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (netbsd-arm64), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (netbsd-arm64), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (netbsd-arm64), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (netbsd-arm64-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (netbsd-arm64-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (netbsd-arm64-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (netbsd-arm64-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (openbsd-386), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (openbsd-386), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (openbsd-386), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (openbsd-386), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (openbsd-386-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (openbsd-386-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (openbsd-386-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (openbsd-386-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (openbsd-amd64), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (openbsd-amd64), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (openbsd-amd64), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (openbsd-amd64), func SendtoInet6(int, []uint8, int, SockaddrInet6) error
pkg syscall (openbsd-amd64-cgo), func RecvfromInet4(int, []uint8, int, *SockaddrInet4) (int, error)
pkg syscall (openbsd-amd64-cgo), func RecvfromInet6(int, []uint8, int, *SockaddrInet6) (int, error)
pkg syscall (openbsd-amd64-cgo), func SendtoInet4(int, []uint8, int, SockaddrInet4) error
pkg syscall (openbsd-amd64-cgo), func SendtoInet6(int, []uint8, int, SockaddrInet6) error

54
src/internal/poll/fd_unix.go
View File

@ -230,6 +230,60 @@ func (fd *FD) ReadFrom(p []byte) (int, syscall.Sockaddr, error) {
}
}
// ReadFrom wraps the recvfrom network call for IPv4.
func (fd *FD) ReadFromInet4(p []byte, from *syscall.SockaddrInet4) (int, error) {
if err := fd.readLock(); err != nil {
return 0, err
}
defer fd.readUnlock()
if err := fd.pd.prepareRead(fd.isFile); err != nil {
return 0, err
}
for {
n, err := syscall.RecvfromInet4(fd.Sysfd, p, 0, from)
if err != nil {
if err == syscall.EINTR {
continue
}
n = 0
if err == syscall.EAGAIN && fd.pd.pollable() {
if err = fd.pd.waitRead(fd.isFile); err == nil {
continue
}
}
}
err = fd.eofError(n, err)
return n, err
}
}
// ReadFrom wraps the recvfrom network call for IPv6.
func (fd *FD) ReadFromInet6(p []byte, from *syscall.SockaddrInet6) (int, error) {
if err := fd.readLock(); err != nil {
return 0, err
}
defer fd.readUnlock()
if err := fd.pd.prepareRead(fd.isFile); err != nil {
return 0, err
}
for {
n, err := syscall.RecvfromInet6(fd.Sysfd, p, 0, from)
if err != nil {
if err == syscall.EINTR {
continue
}
n = 0
if err == syscall.EAGAIN && fd.pd.pollable() {
if err = fd.pd.waitRead(fd.isFile); err == nil {
continue
}
}
}
err = fd.eofError(n, err)
return n, err
}
}
// ReadMsg wraps the recvmsg network call.
func (fd *FD) ReadMsg(p []byte, oob []byte, flags int) (int, int, int, syscall.Sockaddr, error) {
if err := fd.readLock(); err != nil {

18
src/internal/poll/fd_windows.go
View File

@ -593,6 +593,24 @@ func (fd *FD) ReadFrom(buf []byte) (int, syscall.Sockaddr, error) {
return n, sa, nil
}
// ReadFrom wraps the recvfrom network call for IPv4.
func (fd *FD) ReadFromInet4(buf []byte, sa4 *syscall.SockaddrInet4) (int, error) {
n, sa, err := fd.ReadFrom(buf)
if sa != nil {
*sa4 = *(sa.(*syscall.SockaddrInet4))
}
return n, err
}
// ReadFrom wraps the recvfrom network call for IPv6.
func (fd *FD) ReadFromInet6(buf []byte, sa6 *syscall.SockaddrInet6) (int, error) {
n, sa, err := fd.ReadFrom(buf)
if sa != nil {
*sa6 = *(sa.(*syscall.SockaddrInet6))
}
return n, err
}
// Write implements io.Writer.
func (fd *FD) Write(buf []byte) (int, error) {
if err := fd.writeLock(); err != nil {

11
src/net/fd_posix.go
View File

@ -63,6 +63,17 @@ func (fd *netFD) readFrom(p []byte) (n int, sa syscall.Sockaddr, err error) {
runtime.KeepAlive(fd)
return n, sa, wrapSyscallError(readFromSyscallName, err)
}
func (fd *netFD) readFromInet4(p []byte, from *syscall.SockaddrInet4) (n int, err error) {
n, err = fd.pfd.ReadFromInet4(p, from)
runtime.KeepAlive(fd)
return n, wrapSyscallError(readFromSyscallName, err)
}
func (fd *netFD) readFromInet6(p []byte, from *syscall.SockaddrInet6) (n int, err error) {
n, err = fd.pfd.ReadFromInet6(p, from)
runtime.KeepAlive(fd)
return n, wrapSyscallError(readFromSyscallName, err)
}
func (fd *netFD) readMsg(p []byte, oob []byte, flags int) (n, oobn, retflags int, sa syscall.Sockaddr, err error) {
n, oobn, retflags, sa, err = fd.pfd.ReadMsg(p, oob, flags)

8
src/net/net_fake.go
View File

@ -266,6 +266,14 @@ func sysSocket(family, sotype, proto int) (int, error) {
func (fd *netFD) readFrom(p []byte) (n int, sa syscall.Sockaddr, err error) {
return 0, nil, syscall.ENOSYS
}
func (fd *netFD) readFromInet4(p []byte, sa *syscall.SockaddrInet4) (n int, err error) {
return 0, syscall.ENOSYS
}
func (fd *netFD) readFromInet6(p []byte, sa *syscall.SockaddrInet6) (n int, err error) {
return 0, syscall.ENOSYS
}
func (fd *netFD) readMsg(p []byte, oob []byte, flags int) (n, oobn, retflags int, sa syscall.Sockaddr, err error) {

26
src/net/udpsock_posix.go
View File

@ -44,13 +44,25 @@ func (a *UDPAddr) toLocal(net string) sockaddr {
}
func (c *UDPConn) readFrom(b []byte, addr *UDPAddr) (int, *UDPAddr, error) {
n, sa, err := c.fd.readFrom(b)
switch sa := sa.(type) {
case *syscall.SockaddrInet4:
*addr = UDPAddr{IP: sa.Addr[0:], Port: sa.Port}
case *syscall.SockaddrInet6:
*addr = UDPAddr{IP: sa.Addr[0:], Port: sa.Port, Zone: zoneCache.name(int(sa.ZoneId))}
default:
var n int
var err error
switch c.fd.family {
case syscall.AF_INET:
var from syscall.SockaddrInet4
n, err = c.fd.readFromInet4(b, &from)
if err == nil {
ip := from.Addr // copy from.Addr; ip escapes, so this line allocates 4 bytes
*addr = UDPAddr{IP: ip[:], Port: from.Port}
}
case syscall.AF_INET6:
var from syscall.SockaddrInet6
n, err = c.fd.readFromInet6(b, &from)
if err == nil {
ip := from.Addr // copy from.Addr; ip escapes, so this line allocates 16 bytes
*addr = UDPAddr{IP: ip[:], Port: from.Port, Zone: zoneCache.name(int(from.ZoneId))}
}
}
if err != nil {
// No sockaddr, so don't return UDPAddr.
addr = nil
}

8
src/syscall/net_js.go
View File

@ -92,6 +92,14 @@ func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
return 0, nil, ENOSYS
}
func RecvfromInet4(fd int, p []byte, flags int, from *SockaddrInet4) (n int, err error) {
return 0, ENOSYS
}
func RecvfromInet6(fd int, p []byte, flags int, from *SockaddrInet6) (n int, err error) {
return 0, ENOSYS
}
func Sendto(fd int, p []byte, flags int, to Sockaddr) error {
return ENOSYS
}

27
src/syscall/syscall_unix.go
View File

@ -292,6 +292,33 @@ func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
return
}
func RecvfromInet4(fd int, p []byte, flags int, from *SockaddrInet4) (n int, err error) {
var rsa RawSockaddrAny
var socklen _Socklen = SizeofSockaddrAny
if n, err = recvfrom(fd, p, flags, &rsa, &socklen); err != nil {
return
}
pp := (*RawSockaddrInet4)(unsafe.Pointer(&rsa))
port := (*[2]byte)(unsafe.Pointer(&pp.Port))
from.Port = int(port[0])<<8 + int(port[1])
from.Addr = pp.Addr
return
}
func RecvfromInet6(fd int, p []byte, flags int, from *SockaddrInet6) (n int, err error) {
var rsa RawSockaddrAny
var socklen _Socklen = SizeofSockaddrAny
if n, err = recvfrom(fd, p, flags, &rsa, &socklen); err != nil {
return
}
pp := (*RawSockaddrInet6)(unsafe.Pointer(&rsa))
port := (*[2]byte)(unsafe.Pointer(&pp.Port))
from.Port = int(port[0])<<8 + int(port[1])
from.ZoneId = pp.Scope_id
from.Addr = pp.Addr
return
}
func SendtoInet4(fd int, p []byte, flags int, to SockaddrInet4) (err error) {
ptr, n, err := to.sockaddr()
if err != nil {