Changes in README

07496eea - tools/virtio: use canonical ftrace path

Wed, 15 Feb 2023 22:33:49 +0000

tools/virtio: use canonical ftrace pathThe 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/tracingA few spots in tools/virtio still refer to this older debugfspath, 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 List of files: /linux-6.15/tools/virtio/virtio-trace/README

9513c55c - tools/virtio: fix typo in README instructions

Wed, 15 Feb 2023 22:33:50 +0000

tools/virtio: fix typo in README instructionsWe need to have a unique chardev for each data path, else the chardevswill collide and qemu will die with this message: qemu-system-x86_64: -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel0, id=channel1,name=trace-path-cpu0: Property 'virtserialport.chardev' can't take value 'charchannel0': Device 'charchannel0' is in useSigned-off-by: Ross Zwisler Message-Id: <20230215223350.2658616-7-zwisler@google.com>Signed-off-by: Michael S. Tsirkin List of files: /linux-6.15/tools/virtio/virtio-trace/README

108fc825 - tools: Add guest trace agent as a user tool

Thu, 09 Aug 2012 12:31:30 +0000

tools: Add guest trace agent as a user toolThis patch adds a user tool, "trace agent" for sending trace data of a guest toa 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 HostChanges 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 List of files: /linux-6.15/tools/virtio/virtio-trace/README