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wgengine: use a singleflight.Group to reduce status contention (#5450)

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Updates tailscale/coral#72

Signed-off-by: Andrew Dunham <andrew@tailscale.com>

Signed-off-by: Andrew Dunham <andrew@tailscale.com>
This commit is contained in:
Andrew Dunham
2022-08-27 12:36:07 -04:00
committed by GitHub
parent 70f9fc8c7a
commit e8f09d24c7
2 changed files with 15 additions and 1 deletions
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5
wgengine/userspace.go
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@@ -46,6 +46,7 @@ import (
"tailscale.com/util/clientmetric"
"tailscale.com/util/deephash"
"tailscale.com/util/mak"
"tailscale.com/util/singleflight"
"tailscale.com/version"
"tailscale.com/wgengine/filter"
"tailscale.com/wgengine/magicsock"
@@ -146,6 +147,10 @@ type userspaceEngine struct {
// value of the ICMP identifer and sequence number concatenated.
icmpEchoResponseCallback map[uint32]func()
// this singleflight is used to deduplicate calls to getStatus when we
// don't care if the data is perfectly fresh
getStatusSf singleflight.Group[struct{}, *Status]
// Lock ordering: magicsock.Conn.mu, wgLock, then mu.
}