Record the amount of free pages instead of hashmapFreeCount calculation

[ncabatoff]

This is an attempt to continue the work started in #282.

[ahrtr]

Please also signoff the commits. please read https://github.com/etcd-io/bbolt/pull/585/checks?check_run_id=18046520663

[ncabatoff]

Please also signoff the commits. please read https://github.com/etcd-io/bbolt/pull/585/checks?check_run_id=18046520663

I wanted to ask about that, it says:

You should only do this if:

• You are the only author of the commits in this branch

I'm not in this case, so what should I do?

[ahrtr]

I'm not in this case, so what should I do?

You can manually added Signed-off-by: <author's email> for each commit. Since we don't know the original auther's email address, we can use the form of [email protected]. Please refer to about-commit-email-addresses.

Or you can resubmit both commits for simplification (you will be the author of both commits).

Thanks.

[ncabatoff]

Ok, I've done the signoff as you proposed, thanks for the tips. I've also applied your feedback.

[ahrtr]

LGTM

thx @ncabatoff

cc @tjungblu to take another look.

[tjungblu]

/lgtm

Thanks for the contribution @ncabatoff !