Re: [Qemu-devel] [PATCH 2/7] Add tracepoints for savevm section start/end

[Orit Wasserman <owasserm@redhat.com>]

On 05/22/2012 09:32 PM, Juan Quintela wrote:
> This allows to know how long each section takes to save.
> 
> An awk script like this tells us sections that takes more that 10ms
> 
> $1 ~ /savevm_state_iterate_end/ {
> 	/* Print savevm_section_end line when > 10ms duration */
> 	if ($2 > 10000) {
> 		printf("%s times_missing=%u\n", $0, times_missing++);
> 	}
> }
> 
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> ---
>  savevm.c     |    8 ++++++++
>  trace-events |    6 ++++++
>  2 files changed, 14 insertions(+), 0 deletions(-)
> 
> diff --git a/savevm.c b/savevm.c
> index 2d18bab..779bd22 100644
> --- a/savevm.c
> +++ b/savevm.c
> @@ -85,6 +85,7 @@
>  #include "cpus.h"
>  #include "memory.h"
>  #include "qmp-commands.h"
> +#include "trace.h"
> 
>  #define SELF_ANNOUNCE_ROUNDS 5
> 
> @@ -1624,11 +1625,14 @@ int qemu_savevm_state_iterate(QEMUFile *f)
>          if (se->save_live_state == NULL)
>              continue;
> 
> +        trace_savevm_section_start();
>          /* Section type */
>          qemu_put_byte(f, QEMU_VM_SECTION_PART);
>          qemu_put_be32(f, se->section_id);
> 
>          ret = se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
> +        trace_savevm_section_end(se->section_id);
> +
>          if (ret <= 0) {
>              /* Do not proceed to the next vmstate before this one reported
>                 completion of the current stage. This serializes the migration
> @@ -1658,11 +1662,13 @@ int qemu_savevm_state_complete(QEMUFile *f)
>          if (se->save_live_state == NULL)
>              continue;
> 
> +        trace_savevm_section_start();
>          /* Section type */
>          qemu_put_byte(f, QEMU_VM_SECTION_END);
>          qemu_put_be32(f, se->section_id);
> 
>          ret = se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
> +        trace_savevm_section_end(se->section_id);
>          if (ret < 0) {
>              return ret;
>          }
> @@ -1674,6 +1680,7 @@ int qemu_savevm_state_complete(QEMUFile *f)
>  	if (se->save_state == NULL && se->vmsd == NULL)
>  	    continue;
> 
> +        trace_savevm_section_start();
>          /* Section type */
>          qemu_put_byte(f, QEMU_VM_SECTION_FULL);
>          qemu_put_be32(f, se->section_id);
> @@ -1687,6 +1694,7 @@ int qemu_savevm_state_complete(QEMUFile *f)
>          qemu_put_be32(f, se->version_id);
> 
>          vmstate_save(f, se);
> +        trace_savevm_section_end(se->section_id);
>      }
> 
>      qemu_put_byte(f, QEMU_VM_EOF);
> diff --git a/trace-events b/trace-events
> index 87cb96c..73d5f81 100644
> --- a/trace-events
> +++ b/trace-events
> @@ -741,6 +741,11 @@ displaysurface_resize(void *display_state, void *display_surface, int width, int
>  # vga.c
>  ppm_save(const char *filename, void *display_surface) "%s surface=%p"
> 
> +# savevm.c
> +
> +savevm_section_start(void) ""
> +savevm_section_end(unsigned int section_id) "section_id %u"
> +
>  # hw/qxl.c
>  disable qxl_interface_set_mm_time(int qid, uint32_t mm_time) "%d %d"
>  disable qxl_io_write_vga(int qid, const char *mode, uint32_t addr, uint32_t val) "%d %s addr=%u val=%u"
> @@ -805,3 +810,4 @@ qxl_render_blit_guest_primary_initialized(void) ""
>  qxl_render_blit(int32_t stride, int32_t left, int32_t right, int32_t top, int32_t bottom) "stride=%d [%d, %d, %d, %d]"
>  qxl_render_guest_primary_resized(int32_t width, int32_t height, int32_t stride, int32_t bytes_pp, int32_t bits_pp) "%dx%d, stride %d, bpp %d, depth %d"
>  qxl_render_update_area_done(void *cookie) "%p"
> +
extra ws

Reviewed-by: Orit Wasserman <owasserm@redhat.com>