linux-kernel - [PATCH 0/2] force absolute timestamp trace option

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200618221541.247643-1-korben@google.com>
Date:   Thu, 18 Jun 2020 15:15:39 -0700
From:   Korben Rusek <korben@...gle.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Jonathan Corbet <corbet@....net>
Cc:     Peter Shier <pshier@...gle.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, jbehmer@...gle.com,
        franksie@...gle.com, Korben Rusek <korben@...gle.com>
Subject: [PATCH 0/2] force absolute timestamp trace option

Normally a data event includes the delta time between itself and
the previous data event. But if a write interrupts another write
then the event cannot check the timestamp of the previous event
and so it uses a delta of 0.

Adds a new trace option: force-abs-timestamp. When this is on
each event is proceeded by an absolute timestamp event.

This follows from a discussion between jbehmer@...gle.com
and Steven Rostedt found here:

https://lkml.org/lkml/2019/5/24/710

Korben Rusek (2):
  Add force-abs-timestamp trace option.
  tests for absolute timestamp

 Documentation/trace/ftrace.rst                |   5 +
 kernel/trace/trace.c                          |   4 +
 kernel/trace/trace.h                          |   1 +
 tools/testing/selftests/Makefile              |   1 +
 tools/testing/selftests/timestamp/Makefile    |  25 +++
 tools/testing/selftests/timestamp/abs-test.sh | 156 ++++++++++++++
 .../selftests/timestamp/abs-timestamp.c       | 198 ++++++++++++++++++
 7 files changed, 390 insertions(+)
 create mode 100644 tools/testing/selftests/timestamp/Makefile
 create mode 100644 tools/testing/selftests/timestamp/abs-test.sh
 create mode 100644 tools/testing/selftests/timestamp/abs-timestamp.c

-- 
2.27.0.290.gba653c62da-goog