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control/controlclient: delete unreferenced mapSession UserProfiles

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This was a slow memory leak on busy tailnets with lots of tagged
ephemeral nodes.

Updates tailscale/corp#26058

Change-Id: I298e7d438e3ffbb3cde795640e344671d244c632
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2025-01-23 12:45:06 -08:00 committed by Brad Fitzpatrick
parent d6abbc2e61
commit 413fb5b933
1 changed files with 30 additions and 1 deletions
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31
control/controlclient/map.go
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@ -195,6 +195,10 @@ func (ms *mapSession) HandleNonKeepAliveMapResponse(ctx context.Context, resp *t
ms.updateStateFromResponse(resp)
// Occasionally clean up old userprofile if it grows too much
// from e.g. ephemeral tagged nodes.
ms.cleanLastUserProfile()
if ms.tryHandleIncrementally(resp) {
ms.occasionallyPrintSummary(ms.lastNetmapSummary)
return nil
@ -292,7 +296,6 @@ func (ms *mapSession) updateStateFromResponse(resp *tailcfg.MapResponse) {
for _, up := range resp.UserProfiles {
ms.lastUserProfile[up.ID] = up
}
// TODO(bradfitz): clean up old user profiles? maybe not worth it.
if dm := resp.DERPMap; dm != nil {
ms.vlogf("netmap: new map contains DERP map")
@ -532,6 +535,32 @@ func (ms *mapSession) addUserProfile(nm *netmap.NetworkMap, userID tailcfg.UserI
}
}
// cleanLastUserProfile deletes any entries from lastUserProfile
// that are not referenced by any peer or the self node.
//
// This is expensive enough that we don't do this on every message
// from the server, but only when it's grown enough to matter.
func (ms *mapSession) cleanLastUserProfile() {
if len(ms.lastUserProfile) < len(ms.peers)*2 {
// Hasn't grown enough to be worth cleaning.
return
}
keep := set.Set[tailcfg.UserID]{}
if node := ms.lastNode; node.Valid() {
keep.Add(node.User())
}
for _, n := range ms.peers {
keep.Add(n.User())
keep.Add(n.Sharer())
}
for userID := range ms.lastUserProfile {
if !keep.Contains(userID) {
delete(ms.lastUserProfile, userID)
}
}
}
var debugPatchifyPeer = envknob.RegisterBool("TS_DEBUG_PATCHIFY_PEER")
// patchifyPeersChanged mutates resp to promote PeersChanged entries to PeersChangedPatch