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portlist: refactor, introduce OS-specific types
Add an osImpl interface that can be stateful and thus more efficient between calls. It will later be implemented by all OSes but for now this change only adds a Linux implementation. Remove Port.inode. It was only used by Linux and moves into its osImpl. Don't reopen /proc/net/* files on each run. Turns out you can just keep then open and seek to the beginning and reread and the contents are fresh. name old time/op new time/op delta GetListIncremental-8 7.29ms ± 2% 6.53ms ± 1% -10.50% (p=0.000 n=9+9) name old alloc/op new alloc/op delta GetListIncremental-8 1.30kB ±13% 0.70kB ± 5% -46.38% (p=0.000 n=9+10) name old allocs/op new allocs/op delta GetListIncremental-8 33.2 ±11% 18.0 ± 0% -45.82% (p=0.000 n=9+10) Updates #5958 Change-Id: I4be83463cbd23c2e2fa5d0bdf38560004f53401b Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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