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wgengine: predict min.Peers length across calls

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The number of peers we have will be pretty stable across time.
Allocate roughly the right slice size.
This reduces memory usage when there are many peers.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2021-08-18 15:06:40 -07:00 committed by Josh Bleecher Snyder
parent adf696172d
commit 6ef734e493
1 changed files with 3 additions and 1 deletions
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4
wgengine/userspace.go
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@ -108,6 +108,7 @@ type userspaceEngine struct {
wgLock sync.Mutex // serializes all wgdev operations; see lock order comment below
lastCfgFull wgcfg.Config
lastNMinPeers int
lastRouterSig deephash.Sum // of router.Config
lastEngineSigFull deephash.Sum // of full wireguard config
lastEngineSigTrim deephash.Sum // of trimmed wireguard config
@ -606,7 +607,7 @@ func (e *userspaceEngine) maybeReconfigWireguardLocked(discoChanged map[key.Publ
// based on the full config. Prune off all the peers
// and only add the active ones back.
min := full
min.Peers = nil
min.Peers = make([]wgcfg.Peer, 0, e.lastNMinPeers)
// We'll only keep a peer around if it's been active in
// the past 5 minutes. That's more than WireGuard's key
@ -650,6 +651,7 @@ func (e *userspaceEngine) maybeReconfigWireguardLocked(discoChanged map[key.Publ
trimmedDisco[dk] = true
}
}
e.lastNMinPeers = len(min.Peers)
if !deephash.Update(&e.lastEngineSigTrim, &min, trimmedDisco, trackDisco, trackIPs) {
// No changes