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tailscale/util
Joe Tsai 3fc8683585
util/deephash: expand fast-path capabilities (#5404)
Add support for maps and interfaces to the fast path.
Add cycle-detection to the pointer handling logic.
This logic is mostly copied from the slow path.

A future commit will delete the slow path once
the fast path never falls back to the slow path.

Performance:

	name                 old time/op    new time/op    delta
	Hash-24                18.5µs ± 1%    14.9µs ± 2%  -19.52%  (p=0.000 n=10+10)
	HashPacketFilter-24    2.54µs ± 1%    2.60µs ± 1%   +2.19%  (p=0.000 n=10+10)
	HashMapAcyclic-24      31.6µs ± 1%    30.5µs ± 1%   -3.42%  (p=0.000 n=9+8)
	TailcfgNode-24         1.44µs ± 2%    1.43µs ± 1%     ~     (p=0.171 n=10+10)
	HashArray-24            324ns ± 1%     324ns ± 2%     ~     (p=0.425 n=9+9)

The additional cycle detection logic doesn't incur much slow down
since it only activates if a type is recursive, which does not apply
for any of the types that we care about.

There is a notable performance boost since we switch from the fath path
to the slow path less often. Most notably, a struct with a field that
could not be handled by the fast path would previously cause
the entire struct to go through the slow path.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2 years ago
..
cibuild all: use cibuild.On 2 years ago
clientmetric all: gofmt for Go 1.19 2 years ago
cloudenv all: use syncs.AtomicValue 2 years ago
cmpver util/cmpver: move into OSS from corp repo. 3 years ago
codegen all: convert more code to use net/netip directly 2 years ago
deephash util/deephash: expand fast-path capabilities (#5404) 2 years ago
dnsname all: use Go 1.18's strings.Cut 2 years ago
endian all: gofmt with Go 1.17 3 years ago
groupmember util/groupmember: remove redundant code (#4298) 2 years ago
hashx util/hashx: move from sha256x (#5388) 2 years ago
jsonutil all: use any instead of interface{} 2 years ago
lineread util/lineread: add docs to Reader 4 years ago
mak util/mak: move tailssh's mapSet into a new package for reuse elsewhere 2 years ago
multierr all: gofmt for Go 1.19 2 years ago
must util/must: rename Do->Get, add Do 2 years ago
osshare all: gofmt with Go 1.17 3 years ago
pidowner all: gofmt with Go 1.17 3 years ago
precompress cmd/tsconnect,util/precompress: move precompression to its own package 2 years ago
racebuild all: gofmt with Go 1.17 3 years ago
singleflight all: gofmt for Go 1.19 2 years ago
strs util/strs: add new package for string utility funcs 2 years ago
systemd all: gofmt for Go 1.19 2 years ago
uniq all: use any instead of interface{} 2 years ago
winutil util/winutil: consolidate interface specific registry keys 2 years ago