bbf0a44081
Observing block layer aio readv/writev operations is useful for debugging image formats or understanding guest disk I/O patterns. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
72 lines
3.2 KiB
Plaintext
72 lines
3.2 KiB
Plaintext
# Trace events for debugging and performance instrumentation
|
|
#
|
|
# This file is processed by the tracetool script during the build.
|
|
#
|
|
# To add a new trace event:
|
|
#
|
|
# 1. Choose a name for the trace event. Declare its arguments and format
|
|
# string.
|
|
#
|
|
# 2. Call the trace event from code using trace_##name, e.g. multiwrite_cb() ->
|
|
# trace_multiwrite_cb(). The source file must #include "trace.h".
|
|
#
|
|
# Format of a trace event:
|
|
#
|
|
# [disable] <name>(<type1> <arg1>[, <type2> <arg2>] ...) "<format-string>"
|
|
#
|
|
# Example: qemu_malloc(size_t size) "size %zu"
|
|
#
|
|
# The "disable" keyword will build without the trace event.
|
|
# In case of 'simple' trace backend, it will allow the trace event to be
|
|
# compiled, but this would be turned off by default. It can be toggled on via
|
|
# the monitor.
|
|
#
|
|
# The <name> must be a valid as a C function name.
|
|
#
|
|
# Types should be standard C types. Use void * for pointers because the trace
|
|
# system may not have the necessary headers included.
|
|
#
|
|
# The <format-string> should be a sprintf()-compatible format string.
|
|
|
|
# qemu-malloc.c
|
|
disable qemu_malloc(size_t size, void *ptr) "size %zu ptr %p"
|
|
disable qemu_realloc(void *ptr, size_t size, void *newptr) "ptr %p size %zu newptr %p"
|
|
disable qemu_free(void *ptr) "ptr %p"
|
|
|
|
# osdep.c
|
|
disable qemu_memalign(size_t alignment, size_t size, void *ptr) "alignment %zu size %zu ptr %p"
|
|
disable qemu_vmalloc(size_t size, void *ptr) "size %zu ptr %p"
|
|
disable qemu_vfree(void *ptr) "ptr %p"
|
|
|
|
# hw/virtio.c
|
|
disable virtqueue_fill(void *vq, const void *elem, unsigned int len, unsigned int idx) "vq %p elem %p len %u idx %u"
|
|
disable virtqueue_flush(void *vq, unsigned int count) "vq %p count %u"
|
|
disable virtqueue_pop(void *vq, void *elem, unsigned int in_num, unsigned int out_num) "vq %p elem %p in_num %u out_num %u"
|
|
disable virtio_queue_notify(void *vdev, int n, void *vq) "vdev %p n %d vq %p"
|
|
disable virtio_irq(void *vq) "vq %p"
|
|
disable virtio_notify(void *vdev, void *vq) "vdev %p vq %p"
|
|
|
|
# block.c
|
|
disable multiwrite_cb(void *mcb, int ret) "mcb %p ret %d"
|
|
disable bdrv_aio_multiwrite(void *mcb, int num_callbacks, int num_reqs) "mcb %p num_callbacks %d num_reqs %d"
|
|
disable bdrv_aio_multiwrite_earlyfail(void *mcb) "mcb %p"
|
|
disable bdrv_aio_multiwrite_latefail(void *mcb, int i) "mcb %p i %d"
|
|
disable bdrv_aio_readv(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
|
|
disable bdrv_aio_writev(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
|
|
|
|
# hw/virtio-blk.c
|
|
disable virtio_blk_req_complete(void *req, int status) "req %p status %d"
|
|
disable virtio_blk_rw_complete(void *req, int ret) "req %p ret %d"
|
|
disable virtio_blk_handle_write(void *req, uint64_t sector, size_t nsectors) "req %p sector %"PRIu64" nsectors %zu"
|
|
|
|
# posix-aio-compat.c
|
|
disable paio_submit(void *acb, void *opaque, int64_t sector_num, int nb_sectors, int type) "acb %p opaque %p sector_num %"PRId64" nb_sectors %d type %d"
|
|
|
|
# ioport.c
|
|
disable cpu_in(unsigned int addr, unsigned int val) "addr %#x value %u"
|
|
disable cpu_out(unsigned int addr, unsigned int val) "addr %#x value %u"
|
|
|
|
# balloon.c
|
|
# Since requests are raised via monitor, not many tracepoints are needed.
|
|
disable balloon_event(void *opaque, unsigned long addr) "opaque %p addr %lu"
|