kernel/linux.git/tools/virtio/virtio-trace/trace-agent.c, branch v6.1

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

2019-05-30T18:26:38+00:00

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

2012-09-28T05:35:13+00:00

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