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portlist: remove unix.Readlink allocs on Linux

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name       old time/op    new time/op    delta
    GetList-8    11.2ms ± 5%    11.1ms ± 3%     ~     (p=0.661 n=10+9)

    name       old alloc/op   new alloc/op   delta
    GetList-8    83.3kB ± 1%    67.4kB ± 1%  -19.05%  (p=0.000 n=10+10)

    name       old allocs/op  new allocs/op  delta
    GetList-8     2.89k ± 2%     2.19k ± 1%  -24.24%  (p=0.000 n=10+10)

(real issue is we're calling this code as much as we are, but easy
enough to make it efficient because it'll still need to be called
sometimes in any case)

Updates #5958

Change-Id: I90c20278d73e80315a840aed1397d24faa308d93
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-10-22 11:21:10 -07:00
committed by Brad Fitzpatrick
parent 7149155b80
commit 3697609aaa
2 changed files with 26 additions and 3 deletions
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2
cmd/tailscaled/depaware.txt
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@@ -243,7 +243,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/net/tunstats from tailscale.com/net/tstun+
tailscale.com/net/wsconn from tailscale.com/control/controlhttp+
tailscale.com/paths from tailscale.com/ipn/ipnlocal+
tailscale.com/portlist from tailscale.com/ipn/ipnlocal
💣 tailscale.com/portlist from tailscale.com/ipn/ipnlocal
tailscale.com/safesocket from tailscale.com/client/tailscale+
tailscale.com/smallzstd from tailscale.com/ipn/ipnserver+
LD 💣 tailscale.com/ssh/tailssh from tailscale.com/cmd/tailscaled