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Add tracepoints for savevm section start/end 

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>

fix ws tracepoints

Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Juan Quintela 2012-05-21 23:46:44 +02:00
parent d5f8a5701d
commit 517a13c91a
2 changed files with 13 additions and 0 deletions
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8
savevm.c
View File

@ -85,6 +85,7 @@
#include "cpus.h"
#include "memory.h"
#include "qmp-commands.h"
#include "trace.h"
#define SELF_ANNOUNCE_ROUNDS 5
@ -1625,11 +1626,14 @@ 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
@ -1659,11 +1663,13 @@ 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;
}
@ -1675,6 +1681,7 @@ 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);
@ -1688,6 +1695,7 @@ 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);

5
trace-events
View File

@ -783,6 +783,11 @@ 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"