Re: [Qemu-trivial] [PATCH 2/4] block/curl: Convert from DPRINTF() macro to trace events

["Richard W.M. Jones" <rjones@redhat.com>]

On Wed, Dec 12, 2018 at 08:40:07PM +0100, Laurent Vivier wrote:
> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
> ---
>  block/curl.c       | 29 ++++++++---------------------
>  block/trace-events |  9 +++++++++
>  2 files changed, 17 insertions(+), 21 deletions(-)
> 
> diff --git a/block/curl.c b/block/curl.c
> index db5d2bd8ef..b7ac265d3a 100644
> --- a/block/curl.c
> +++ b/block/curl.c
> @@ -32,22 +32,10 @@
>  #include "crypto/secret.h"
>  #include <curl/curl.h>
>  #include "qemu/cutils.h"
> +#include "trace.h"
>  
> -// #define DEBUG_CURL
>  // #define DEBUG_VERBOSE
>  
> -#ifdef DEBUG_CURL
> -#define DEBUG_CURL_PRINT 1
> -#else
> -#define DEBUG_CURL_PRINT 0
> -#endif
> -#define DPRINTF(fmt, ...)                                            \
> -    do {                                                             \
> -        if (DEBUG_CURL_PRINT) {                                      \
> -            fprintf(stderr, fmt, ## __VA_ARGS__);                    \
> -        }                                                            \
> -    } while (0)
> -
>  #if LIBCURL_VERSION_NUM >= 0x071000
>  /* The multi interface timer callback was introduced in 7.16.0 */
>  #define NEED_CURL_TIMER_CALLBACK
> @@ -154,7 +142,7 @@ static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque)
>  {
>      BDRVCURLState *s = opaque;
>  
> -    DPRINTF("CURL: timer callback timeout_ms %ld\n", timeout_ms);
> +    trace_curl_timer_cb(timeout_ms);
>      if (timeout_ms == -1) {
>          timer_del(&s->timer);
>      } else {
> @@ -193,7 +181,7 @@ static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
>      }
>      socket = NULL;
>  
> -    DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, (int)fd);
> +    trace_curl_sock_cb(action, (int)fd);
>      switch (action) {
>          case CURL_POLL_IN:
>              aio_set_fd_handler(s->aio_context, fd, false,
> @@ -238,7 +226,7 @@ static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
>      size_t realsize = size * nmemb;
>      int i;
>  
> -    DPRINTF("CURL: Just reading %zd bytes\n", realsize);
> +    trace_curl_read_cb(realsize);
>  
>      if (!s || !s->orig_buf) {
>          goto read_end;
> @@ -777,7 +765,7 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags,
>          }
>      }
>  
> -    DPRINTF("CURL: Opening %s\n", file);
> +    trace_curl_open(file);
>      qemu_co_queue_init(&s->free_state_waitq);
>      s->aio_context = bdrv_get_aio_context(bs);
>      s->url = g_strdup(file);
> @@ -830,7 +818,7 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags,
>                  "Server does not support 'range' (byte ranges).");
>          goto out;
>      }
> -    DPRINTF("CURL: Size = %" PRIu64 "\n", s->len);
> +    trace_curl_open_size(s->len);
>  
>      qemu_mutex_lock(&s->mutex);
>      curl_clean_state(state);
> @@ -908,8 +896,7 @@ static void curl_setup_preadv(BlockDriverState *bs, CURLAIOCB *acb)
>      state->acb[0] = acb;
>  
>      snprintf(state->range, 127, "%" PRIu64 "-%" PRIu64, start, end);
> -    DPRINTF("CURL (AIO): Reading %" PRIu64 " at %" PRIu64 " (%s)\n",
> -            acb->bytes, start, state->range);
> +    trace_curl_setup_preadv(acb->bytes, start, state->range);
>      curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);
>  
>      curl_multi_add_handle(s->multi, state->curl);
> @@ -943,7 +930,7 @@ static void curl_close(BlockDriverState *bs)
>  {
>      BDRVCURLState *s = bs->opaque;
>  
> -    DPRINTF("CURL: Close\n");
> +    trace_curl_close();
>      curl_detach_aio_context(bs);
>      qemu_mutex_destroy(&s->mutex);
>  
> diff --git a/block/trace-events b/block/trace-events
> index b13b1e9706..5b83280b02 100644
> --- a/block/trace-events
> +++ b/block/trace-events
> @@ -173,3 +173,12 @@ ssh_write(int64_t offset, size_t size) "offset=%" PRIi64 " size=%zu"
>  ssh_write_buf(void *buf, size_t size) "sftp_write buf=%p size=%zu"
>  ssh_write_return(size_t ret) "sftp_write returned %zd"
>  ssh_seek(uint64_t offset) "seeking to offset=%" PRIi64
> +
> +# block/curl.c
> +curl_timer_cb(long timeout_ms) "timer callback timeout_ms %ld"
> +curl_sock_cb(int action, int fd) "sock action %d on fd %d"
> +curl_read_cb(size_t realsize) "just reading %zd bytes"
> +curl_open(const char *file) "opening %s"
> +curl_open_size(uint64_t size) "size = %" PRIu64
> +curl_setup_preadv(uint64_t bytes, uint64_t start, const char *range) "reading %" PRIu64 " at %" PRIu64 " (%s)"
> +curl_close(void) "close"


Reviewed-by: Richard W.M. Jones <rjones@redhat.com>

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines.  Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top