kernel.git/tools/virtio/virtio-trace/trace-agent.c, branch linux-rolling-lts

tools/virtio: use canonical ftrace path

2023-06-09T16:08:08Z

The canonical location for the tracefs filesystem is at /sys/kernel/tracing. But, from Documentation/trace/ftrace.rst: Before 4.1, all ftrace tracing control files were within the debugfs file system, which is typically located at /sys/kernel/debug/tracing. For backward compatibility, when mounting the debugfs file system, the tracefs file system will be automatically mounted at: /sys/kernel/debug/tracing A few spots in tools/virtio still refer to this older debugfs path, so let's update them to avoid confusion. Signed-off-by: Ross Zwisler Message-Id: <20230215223350.2658616-6-zwisler@google.com> Signed-off-by: Michael S. Tsirkin Reviewed-by: Mukesh Ojha

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 165

2019-05-30T18:26:38Z

Based on 1 normalized pattern(s): licensed under gpl version 2 only extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 3 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Armijn Hemel Reviewed-by: Kate Stewart Reviewed-by: Richard Fontana Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.838202816@linutronix.de Signed-off-by: Greg Kroah-Hartman

tools: Add guest trace agent as a user tool

2012-09-28T05:35:13Z

This patch adds a user tool, "trace agent" for sending trace data of a guest to a Host in low overhead. This agent has the following functions: - splice a page of ring-buffer to read_pipe without memory copying - splice the page from write_pipe to virtio-console without memory copying - write trace data to stdout by using -o option - controlled by start/stop orders from a Host Changes in v2: - Cleanup (change fprintf() to pr_err() and an include guard) Signed-off-by: Yoshihiro YUNOMAE Acked-by: Amit Shah Signed-off-by: Rusty Russell