On 05/02/2012 02:24 PM, Takuya Yoshikawa wrote:
> During checking mmu_lock contention, I noticed that QEMU's
> memory_region_get_dirty() was using unexpectedly much CPU time.
>
> Thanks,
> Takuya
>
> =============================
> perf top -t ${QEMU_TID}
> =============================
> 51.52% qemu-system-x86_64 [.] memory_region_get_dirty
> 16.73% qemu-system-x86_64 [.] ram_save_remaining
>
memory_region_get_dirty() is called from ram_save_remaining(). Looks
like quadratic behaviour here: we send a few pages in
ram_save_remaining(), then walk the entire dirty bitmap to calculate
expected_time().
We should probably calculate expected_time once per iteration.
--
error compiling committee.c: too many arguments to function
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