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portlist: refactor, introduce OS-specific types

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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>
This commit is contained in:
Brad Fitzpatrick
2022-10-23 18:02:02 -07:00
committed by Brad Fitzpatrick
parent 4597ec1037
commit 036f70b7b4
6 changed files with 282 additions and 248 deletions
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26
portlist/netstat_test.go
View File

@@ -71,19 +71,19 @@ udp4 0 0 *.5553 *.*
func TestParsePortsNetstat(t *testing.T) {
want := List{
Port{"tcp", 22, "", ""},
Port{"tcp", 23, "", ""},
Port{"tcp", 24, "", ""},
Port{"tcp", 32, "sshd", ""},
Port{"udp", 53, "chrome", ""},
Port{"udp", 53, "funball", ""},
Port{"udp", 5050, "CDPSvc", ""},
Port{"udp", 5353, "", ""},
Port{"udp", 5354, "", ""},
Port{"udp", 5453, "", ""},
Port{"udp", 5553, "", ""},
Port{"tcp", 8185, "", ""}, // but not 8186, 8187, 8188 on localhost
Port{"udp", 9353, "iTunes", ""},
Port{"tcp", 22, ""},
Port{"tcp", 23, ""},
Port{"tcp", 24, ""},
Port{"tcp", 32, "sshd"},
Port{"udp", 53, "chrome"},
Port{"udp", 53, "funball"},
Port{"udp", 5050, "CDPSvc"},
Port{"udp", 5353, ""},
Port{"udp", 5354, ""},
Port{"udp", 5453, ""},
Port{"udp", 5553, ""},
Port{"tcp", 8185, ""}, // but not 8186, 8187, 8188 on localhost
Port{"udp", 9353, "iTunes"},
}
pl := appendParsePortsNetstat(nil, netstatOutput)