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wgengine: don't re-allocate trimmedNodes map (#5825)

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Change-Id: I512945b662ba952c47309d3bf8a1b243e05a4736
Signed-off-by: Andrew Dunham <andrew@tailscale.com>
This commit is contained in:
Andrew Dunham 2022-10-04 13:20:09 -04:00 committed by GitHub
parent 445c8a4671
commit e5636997c5
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 11 additions and 5 deletions
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1
cmd/tailscaled/depaware.txt
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@ -321,6 +321,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
golang.org/x/crypto/salsa20/salsa from golang.org/x/crypto/nacl/box+
LD golang.org/x/crypto/ssh from tailscale.com/ssh/tailssh+
golang.org/x/exp/constraints from golang.org/x/exp/slices
golang.org/x/exp/maps from tailscale.com/wgengine
golang.org/x/exp/slices from tailscale.com/ipn/ipnlocal+
golang.org/x/net/bpf from github.com/mdlayher/genetlink+
golang.org/x/net/dns/dnsmessage from net+

15
wgengine/userspace.go
View File

@ -18,6 +18,7 @@
"sync"
"time"
"golang.org/x/exp/maps"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/tun"
"tailscale.com/control/controlclient"
@ -671,7 +672,13 @@ func (e *userspaceEngine) maybeReconfigWireguardLocked(discoChanged map[key.Node
trackNodes := make([]key.NodePublic, 0, len(full.Peers))
trackIPs := make([]netip.Addr, 0, len(full.Peers))
trimmedNodes := map[key.NodePublic]bool{} // TODO: don't re-alloc this map each time
// Don't re-alloc the map; the Go compiler optimizes map clears as of
// Go 1.11, so we can re-use the existing + allocated map.
if e.trimmedNodes != nil {
maps.Clear(e.trimmedNodes)
} else {
e.trimmedNodes = make(map[key.NodePublic]bool)
}
needRemoveStep := false
for i := range full.Peers {
@ -696,7 +703,7 @@ func (e *userspaceEngine) maybeReconfigWireguardLocked(discoChanged map[key.Node
needRemoveStep = true
}
} else {
trimmedNodes[nk] = true
e.trimmedNodes[nk] = true
}
}
e.lastNMinPeers = len(min.Peers)
@ -706,12 +713,10 @@ func (e *userspaceEngine) maybeReconfigWireguardLocked(discoChanged map[key.Node
TrimmedNodes map[key.NodePublic]bool
TrackNodes []key.NodePublic
TrackIPs []netip.Addr
}{&min, trimmedNodes, trackNodes, trackIPs}); !changed {
}{&min, e.trimmedNodes, trackNodes, trackIPs}); !changed {
return nil
}
e.trimmedNodes = trimmedNodes
e.updateActivityMapsLocked(trackNodes, trackIPs)
if needRemoveStep {