linux-kernel - Re: Fwd: Any way to find the network usage by a process?

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Message-ID: <y0m3ba2jw4w.fsf@ton.toronto.redhat.com>
Date:	05 Oct 2006 17:22:23 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Mike Mason <mmlnx@...ibm.com>
Cc:	jrs@...ibm.com, Irfan Habib <irfan.habib@...il.com>,
	Linux kernel <linux-kernel@...r.kernel.org>,
	SystemTAP <systemtap@...rces.redhat.com>
Subject: Re: Fwd: Any way to find the network usage by a process?

Mike Mason <mmlnx@...ibm.com> writes:

> Here's a variation of Jose's script that uses the networking tapset
> and prints top-like output for transmits and receives.  [...]

Thanks for posting it to the systemtap wiki.

Some minor style suggestions follow:

> [...]
>          ifxmit_p[pid(), dev_name] ++
>          ifxmit_b[pid(), dev_name] += length

These could be collapsed into a single statistics-aggregate array: 
#          ifxmit[pid(), dev_name] <<< length
Then the printing routine would use @count(ifxmit[...]) and @sum(ifxmit[...])
to extract the two values.  Same of course for ifrecv.

>          execname[pid()] = execname()
>          user[pid()] = uid()
>          ifdevs[pid(), dev_name] = dev_name

Calling pid() so many times is worse than calling it once and caching
the result in a local variable ("p = pid()").  

The way that the script tracks pid-to-uid and pid-to-execname mappings
is not bad, though if that part were moved to new probes on fork or
exec, it would allow the network-related probes to run concurrently on
an SMP without fighting over locks.

- FChE
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