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util/dirwalk, metrics, portlist: add new package for fast directory walking

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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>
This commit is contained in:
Brad Fitzpatrick
2022-11-05 14:26:29 -07:00
committed by Brad Fitzpatrick
parent 21ef7e5c35
commit db2cc393af
9 changed files with 422 additions and 178 deletions
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3
cmd/tailscaled/depaware.txt
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@@ -212,7 +212,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/logtail from tailscale.com/control/controlclient+
tailscale.com/logtail/backoff from tailscale.com/control/controlclient+
tailscale.com/logtail/filch from tailscale.com/logpolicy
💣 tailscale.com/metrics from tailscale.com/derp+
tailscale.com/metrics from tailscale.com/derp+
tailscale.com/net/dns from tailscale.com/ipn/ipnlocal+
tailscale.com/net/dns/publicdns from tailscale.com/net/dns/resolver+
tailscale.com/net/dns/resolvconffile from tailscale.com/net/dns+
@@ -275,6 +275,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/util/cloudenv from tailscale.com/net/dns/resolver+
LW tailscale.com/util/cmpver from tailscale.com/net/dns+
💣 tailscale.com/util/deephash from tailscale.com/ipn/ipnlocal+
L 💣 tailscale.com/util/dirwalk from tailscale.com/metrics+
tailscale.com/util/dnsname from tailscale.com/hostinfo+
LW tailscale.com/util/endian from tailscale.com/net/dns+
tailscale.com/util/goroutines from tailscale.com/control/controlclient+