linux-kernel - Re: [PATCH v1 0/2] Add procfs based memory and network tool events

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Message-ID: <aV4UZCCc2QOhdeSE@google.com>
Date: Wed, 7 Jan 2026 00:08:04 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	James Clark <james.clark@...aro.org>,
	Thomas Falcon <thomas.falcon@...el.com>,
	Thomas Richter <tmricht@...ux.ibm.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/2] Add procfs based memory and network tool events

Hi Ian,

On Sat, Jan 03, 2026 at 05:17:36PM -0800, Ian Rogers wrote:
> Add events for memory use and network activity based on data readily
> available in /prod/pid/statm, /proc/pid/smaps_rollup and
> /proc/pid/net/dev. For example the network usage of chrome processes
> on a system may be gathered with:
> ```
> $ perf stat -e net_rx_bytes,net_rx_compressed,net_rx_drop,net_rx_errors,net_rx_fifo,net_rx_frame,net_rx_multicast,net_rx_packets,net_tx_bytes,net_tx_carrier,net_tx_colls,net_tx_compressed,net_tx_drop,net_tx_errors,net_tx_fifo,net_tx_packets -p $(pidof -d, chrome) -I 1000
>      1.001023475                  0      net_rx_bytes
>      1.001023475                  0      net_rx_compressed
>      1.001023475         42,647,328      net_rx_drop
>      1.001023475        463,069,152      net_rx_errors
>      1.001023475                  0      net_rx_fifo
>      1.001023475                  0      net_rx_frame
>      1.001023475                  0      net_rx_multicast
>      1.001023475    423,195,831,744      net_rx_packets
>      1.001023475                  0      net_tx_bytes
>      1.001023475                  0      net_tx_carrier
>      1.001023475                  0      net_tx_colls
>      1.001023475                  0      net_tx_compressed
>      1.001023475                  0      net_tx_drop
>      1.001023475                  0      net_tx_errors
>      1.001023475                  0      net_tx_fifo
>      1.001023475                  0      net_tx_packets
> ```

Interesting.

> 
> As the events are in the tool_pmu they can be used in metrics. The
> json descriptions they are exposed in `perf list` and the events can
> be seen in the python ilist application.
> 
> Note, if a process terminates then the count reading returns an error
> and this can expose what appear to be latent bugs in the aggregation
> and display code.

How do you handle system-wide mode and sampling (perf record)?

Thanks,
Namhyung

> 
> Ian Rogers (2):
>   perf tool_pmu: Add memory events
>   perf tool_pmu: Add network events
> 
>  tools/perf/builtin-stat.c                     |  10 +-
>  .../pmu-events/arch/common/common/tool.json   | 266 ++++++++-
>  tools/perf/pmu-events/empty-pmu-events.c      | 312 +++++++----
>  tools/perf/util/tool_pmu.c                    | 514 +++++++++++++++++-
>  tools/perf/util/tool_pmu.h                    |  44 ++
>  5 files changed, 1026 insertions(+), 120 deletions(-)
> 
> -- 
> 2.52.0.351.gbe84eed79e-goog
>