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tailscale/wgengine
Joe Tsai 2e5d08ec4f
net/connstats: invert network logging data flow (#6272)
Previously, tstun.Wrapper and magicsock.Conn managed their
own statistics data structure and relied on an external call to
Extract to extract (and reset) the statistics.
This makes it difficult to ensure a maximum size on the statistics
as the caller has no introspection into whether the number
of unique connections is getting too large.

Invert the control flow such that a *connstats.Statistics
is registered with tstun.Wrapper and magicsock.Conn.
Methods on non-nil *connstats.Statistics are called for every packet.
This allows the implementation of connstats.Statistics (in the future)
to better control when it needs to flush to ensure
bounds on maximum sizes.

The value registered into tstun.Wrapper and magicsock.Conn could
be an interface, but that has two performance detriments:

1. Method calls on interface values are more expensive since
they must go through a virtual method dispatch.

2. The implementation would need a sync.Mutex to protect the
statistics value instead of using an atomic.Pointer.

Given that methods on constats.Statistics are called for every packet,
we want reduce the CPU cost on this hot path.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2 years ago
..
bench
filter
magicsock net/connstats: invert network logging data flow (#6272) 2 years ago
monitor util/set: add new set package for SetHandle type 2 years ago
netlog net/connstats: invert network logging data flow (#6272) 2 years ago
netstack ipn/ipnlocal: call checkPrefs in Start too 2 years ago
router cmd/tailscaled, wgengine/router: use wingoes/com for COM initialization instead of go-ole 2 years ago
wgcfg types/logid: move logtail ID types here (#6336) 2 years ago
wgint
wglog
winnet all: remove old +build tags 2 years ago
mem_ios.go
pendopen.go
userspace.go wgengine: respect --no-logs-no-support flag for network logging (#6172) 2 years ago
userspace_ext_test.go
userspace_test.go
watchdog.go all: remove old +build tags 2 years ago
watchdog_js.go
watchdog_test.go
wgengine.go wgengine: fix typo in Engine.PeerForIP (#5912) 2 years ago