"We think"? I mean - yes, I think so too. But have you actually measured it?
How much improvement are we talking here?
Is it still faster when a bswap is involved?
Thanks for pointing out.
I will post the data for x86 later.
However, I don't have a test environment to check the impact of bswap.
Would you please measure the run time between the following section if possible?
start ->
qemu-kvm.c:
static int kvm_get_dirty_bitmap_cb(unsigned long start, unsigned long len,
void *bitmap, void *opaque)
{
/* warm up each function */
kvm_get_dirty_pages_log_range(start, bitmap, start, len);
kvm_get_dirty_pages_log_range_new(start, bitmap, start, len);
/* measurement */
int64_t t1, t2;
t1 = cpu_get_real_ticks();
kvm_get_dirty_pages_log_range(start, bitmap, start, len);
t1 = cpu_get_real_ticks() - t1;
t2 = cpu_get_real_ticks();
kvm_get_dirty_pages_log_range_new(start, bitmap, start, len);
t2 = cpu_get_real_ticks() - t2;
printf("## %zd, %zd\n", t1, t2); fflush(stdout);
return kvm_get_dirty_pages_log_range_new(start, bitmap, start, len);
}
end ->
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