Re: [PATCH v2 04/13] ram.c: Reset result after sending queued data

[Juan Quintela <quintela@redhat.com>]

Lukas Straub <lukasstraub2@web.de> wrote:
> And take the param->mutex lock for the whole section to ensure
> thread-safety.
> Now, it is explicitly clear if there is no queued data to send.
> Before, this was handled by param->file stream being empty and thus
> qemu_put_qemu_file() not sending anything.
>
> This will be used in the next commits to move save_page_header()
> out of compress code.
>
> Signed-off-by: Lukas Straub <lukasstraub2@web.de>

Reviewed-by: Juan Quintela <quintela@redhat.com>

If you do more changes around here, please consider:

> @@ -1540,13 +1547,16 @@ static void flush_compressed_data(RAMState *rs)
>      for (idx = 0; idx < thread_count; idx++) {

Move

CompressParam *param = &comp_param[idx];

to here, and use it also for the locks.
I will even think about calling the variable just p.

And once there, everything under the sun except this uses i as a for
variable, not idx O:-)

>          qemu_mutex_lock(&comp_param[idx].mutex);
>          if (!comp_param[idx].quit) {
> -            len = qemu_put_qemu_file(ms->to_dst_file, comp_param[idx].file);
> +            CompressParam *param = &comp_param[idx];

Move this declaration

> +            len = qemu_put_qemu_file(ms->to_dst_file, param->file);
> +            compress_reset_result(param);
> +
>              /*
>               * it's safe to fetch zero_page without holding comp_done_lock
>               * as there is no further request submitted to the thread,
>               * i.e, the thread should be waiting for a request at this point.
>               */
> -            update_compress_thread_counts(&comp_param[idx], len);
> +            update_compress_thread_counts(param, len);
>          }
>          qemu_mutex_unlock(&comp_param[idx].mutex);
>      }
> @@ -1571,15 +1581,17 @@ static int compress_page_with_multi_thread(RAMBlock *block, ram_addr_t offset)
>  retry:
>      for (idx = 0; idx < thread_count; idx++) {
>          if (comp_param[idx].done) {
> -            comp_param[idx].done = false;


Same here.