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David Anderson 0909e90890 util/lru: replace container/list with a custom ring implementation ... pre-generics container/list is quite unpleasant to use, and the pointer manipulation operations for an LRU are simple enough to implement directly now that we have generic types. With this change, the LRU uses a ring (aka circularly linked list) rather than a simple doubly-linked list as its internals, because the ring makes list manipulation edge cases more regular: the only remaining edge case is the transition between 0 and 1 elements, rather than also having to deal specially with manipulating the first and last members of the list. While the primary purpose was improved readability of the code, as it turns out removing the indirection through an interface box also speeds up the LRU: │ before.txt │ after.txt │ │ sec/op │ sec/op vs base │ LRU-32 67.05n ± 2% 59.73n ± 2% -10.90% (p=0.000 n=20) │ before.txt │ after.txt │ │ B/op │ B/op vs base │ LRU-32 21.00 ± 0% 10.00 ± 0% -52.38% (p=0.000 n=20) │ before.txt │ after.txt │ │ allocs/op │ allocs/op vs base │ LRU-32 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=20) ¹ Updates #cleanup Signed-off-by: David Anderson <danderson@tailscale.com>		10 months ago
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cibuild	all: update copyright and license headers	1 year ago
clientmetric	util/clientmetric: allow client metric values to be provided by a function	1 year ago
cloudenv	all: update copyright and license headers	1 year ago
cmpver	util/cmpver: add a few tests covering different OS versions	10 months ago
cmpx	all: update exp/slices and fix call sites	11 months ago
codegen	util/codegen: support embedded fields	1 year ago
cstruct	all: update copyright and license headers	1 year ago
deephash	util/deephash: add IncludeFields, ExcludeFields HasherForType Options	10 months ago
dirwalk	all: use tstest.Replace more	1 year ago
dnsname	cmd/tailscale: extend hostname validation (#7678)	1 year ago
goroutines	util/goroutines: let ScrubbedGoroutineDump get only current stack	1 year ago
groupmember	all: update copyright and license headers	1 year ago
hashx	all: update copyright and license headers	1 year ago
httpm	all: update copyright and license headers	1 year ago
jsonutil	all: update copyright and license headers	1 year ago
limiter	util/limiter: add a keyed token bucket rate limiter	10 months ago
lineread	all: update copyright and license headers	1 year ago
linuxfw	client/web, clientupdate, util/linuxfw, wgengine/magicsock: Use %v verb for errors	10 months ago
lru	util/lru: replace container/list with a custom ring implementation	10 months ago
mak	various: add golangci-lint, fix issues (#7905)	1 year ago
multierr	all: use Go 1.21 slices, maps instead of x/exp/{slices,maps}	11 months ago
must	all: update copyright and license headers	1 year ago
osdiag	util/osdiag: add query for Windows page file configuration and status	10 months ago
osshare	all: update copyright and license headers	1 year ago
pidowner	all: update copyright and license headers	1 year ago
precompress	all: update copyright and license headers	1 year ago
quarantine	all: update copyright and license headers	1 year ago
racebuild	all: update copyright and license headers	1 year ago
rands	util/rands: add package with HexString func	10 months ago
ringbuffer	util/ringbuffer: move generic ringbuffer from corp repo	1 year ago
set	cmd/k8s-operator: add metrics to track usage	10 months ago
singleflight	all: update copyright and license headers	1 year ago
slicesx	all: use Go 1.21 slices, maps instead of x/exp/{slices,maps}	11 months ago
sysresources	util/sysresources, magicsock: scale DERP buffer based on system memory	1 year ago
systemd	all: update copyright and license headers	1 year ago
testenv	util/testenv: add new package to hold InTest	11 months ago
truncate	util: add truncate package (#7490)	1 year ago
uniq	all: update copyright and license headers	1 year ago
vizerror	util/vizerror: add As function to get wrapped Error	1 year ago
winutil	util/winutil: add RegisterForRestart, allowing programs to indicate their preferences to the Windows restart manager	11 months ago