Re: [PATCH 5/9] util/bufferiszero: Use i386 cpuinfo.h

[Juan Quintela]

Richard Henderson <richard.henderson@linaro.org> wrote:
> Use cpuinfo_init() during init_accel(), and the variable cpuinfo
> during test_buffer_is_zero_next_accel().  Adjust the logic that
> cycles through the set of accelerators for testing.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Semi related to this.

For migration, I check every single page to see if it is full of zeros.
But I can promisse that it is just a page (i.e. 4KiB, 16KiB or 64KiB,
correct alignation, correct length, ...).

Will do it make sense to have an special function for that?

Yes, I have found with perf that bufferiszero() is quite high.  No, I
haven't try to experiment using a function that is optimized for the
page size in the architecture.

What do you think?

Later, Juan.