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Brad Fitzpatrick db2cc393af util/dirwalk, metrics, portlist: add new package for fast directory walking ... This is similar to the golang.org/x/tools/internal/fastwalk I'd previously written but not recursive and using mem.RO. The metrics package already had some Linux-specific directory reading code in it. Move that out to a new general package that can be reused by portlist too, which helps its scanning of all /proc files: name old time/op new time/op delta FindProcessNames-8 2.79ms ± 6% 2.45ms ± 7% -12.11% (p=0.000 n=10+10) name old alloc/op new alloc/op delta FindProcessNames-8 62.9kB ± 0% 33.5kB ± 0% -46.76% (p=0.000 n=9+10) name old allocs/op new allocs/op delta FindProcessNames-8 2.25k ± 0% 0.38k ± 0% -82.98% (p=0.000 n=9+10) Change-Id: I75db393032c328f12d95c39f71c9742c375f207a Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>		2 years ago
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cibuild	all: use cibuild.On	3 years ago
clientmetric	all: fix spelling mistakes	2 years ago
cloudenv	all: use syncs.AtomicValue	2 years ago
cmpver	util/cmpver: move into OSS from corp repo.	4 years ago
codegen	all: convert more code to use net/netip directly	2 years ago
cstruct	all: remove old +build tags	2 years ago
deephash	tailcfg: add Node.UnsignedPeerAPIOnly to let server mark node as peerapi-only	2 years ago
dirwalk	util/dirwalk, metrics, portlist: add new package for fast directory walking	2 years ago
dnsname	all: fix spelling mistakes	2 years ago
endian	all: remove old +build tags	2 years ago
goroutines	ipn/ipnlocal: add c2n /debug/{goroutines,prefs,metrics}	2 years ago
groupmember	util/groupmember: remove redundant code (#4298)	3 years ago
hashx	util/hashx: move from sha256x (#5388)	2 years ago
jsonutil	all: use any instead of interface{}	3 years ago
lineread	util/lineread: add docs to Reader	4 years ago
mak	all: fix spelling mistakes	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: remove old +build tags	2 years ago
pidowner	all: remove old +build tags	2 years ago
precompress	cmd/tsconnect: pre-compress main.wasm when building the NPM package	2 years ago
racebuild	all: remove old +build tags	2 years ago
singleflight	util/singleflight: sync with upstream	2 years ago
strs	util/strs: add new package for string utility funcs	2 years ago
systemd	all: remove old +build tags	2 years ago
uniq	util/uniq: add ModifySliceFunc (#5504)	2 years ago
winutil	all: remove old +build tags	2 years ago