search for: write_pipe

...e are 5 main components: (1) Ring-buffer of ftrace in a guest - When trace agent reads ring-buffer, a page is removed from ring-buffer. (2) Trace agent in the guest - Splice the page of ring-buffer to read_pipe using splice() without memory copying. Then, the page is spliced from write_pipe to virtio without memory copying. (3) Virtio-console driver in the guest - Pass the page to virtio-ring (4) Virtio-serial bus in QEMU - Copy the page to kernel pipe (5) Reader in the host - Read guest tracing data via FIFO(named pipe) Here, this patch set is only for guest...

...e are 5 main components: (1) Ring-buffer of ftrace in a guest - When trace agent reads ring-buffer, a page is removed from ring-buffer. (2) Trace agent in the guest - Splice the page of ring-buffer to read_pipe using splice() without memory copying. Then, the page is spliced from write_pipe to virtio without memory copying. (3) Virtio-console driver in the guest - Pass the page to virtio-ring (4) Virtio-serial bus in QEMU - Copy the page to kernel pipe (5) Reader in the host - Read guest tracing data via FIFO(named pipe) Here, this patch set is only for guest...

...e are 5 main components: (1) Ring-buffer of ftrace in a guest - When trace agent reads ring-buffer, a page is removed from ring-buffer. (2) Trace agent in the guest - Splice the page of ring-buffer to read_pipe using splice() without memory copying. Then, the page is spliced from write_pipe to virtio without memory copying. (3) Virtio-console driver in the guest - Pass the page to virtio-ring (4) Virtio-serial bus in QEMU - Copy the page to kernel pipe (5) Reader in the host - Read guest tracing data via FIFO(named pipe) ***Evaluation*** When a host collects...

...e are 5 main components: (1) Ring-buffer of ftrace in a guest - When trace agent reads ring-buffer, a page is removed from ring-buffer. (2) Trace agent in the guest - Splice the page of ring-buffer to read_pipe using splice() without memory copying. Then, the page is spliced from write_pipe to virtio without memory copying. (3) Virtio-console driver in the guest - Pass the page to virtio-ring (4) Virtio-serial bus in QEMU - Copy the page to kernel pipe (5) Reader in the host - Read guest tracing data via FIFO(named pipe) ***Evaluation*** When a host collects...