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metrics: optimize CurrentFDs to not allocate on Linux

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It was 50% of our allocs on one of our servers. (!!)

Updates #2784

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-09-02 11:49:32 -07:00
committed by Brad Fitzpatrick
parent db3586cd43
commit 99a1c74a6a
4 changed files with 126 additions and 10 deletions
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cmd/tailscale/depaware.txt
+1 -1
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@@ -32,7 +32,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
tailscale.com/ipn from tailscale.com/cmd/tailscale/cli+
tailscale.com/ipn/ipnstate from tailscale.com/cmd/tailscale/cli+
tailscale.com/kube from tailscale.com/ipn
tailscale.com/metrics from tailscale.com/derp
💣 tailscale.com/metrics from tailscale.com/derp
tailscale.com/net/dnscache from tailscale.com/derp/derphttp
tailscale.com/net/flowtrack from tailscale.com/wgengine/filter+
💣 tailscale.com/net/interfaces from tailscale.com/cmd/tailscale/cli+