shirou

So rchar has a value even if read_bytes are 0 in sometimes, correct? If so, how about use rchar value as `read_bytes` if read_bytes is 0. According to your cited...

Thank you for your contribution. However, we don't want to add Linux specific information.

One more reason is [psutil doesn't have that fields](https://psutil.readthedocs.io/en/latest/#psutil.Process.io_counters).

According to the [psutil implementation](https://github.com/giampaolo/psutil/blob/master/psutil/_psposix.py#L192), `Free` is a "avail_to_user", not a "avail_to_root". Could you tell us what Linux kernel version think `Total-Free! = Used`?

Sadly, there are no response other than kind Lomanic, so I did not merge. but from your comment, I will merge it.

#1192 is only partial fix. reopen it until more good solution implemented. @BitesPotatoBacks 's [great work](https://github.com/shirou/gopsutil/issues/1000#issuecomment-993702515) should fix. I think we can implement by using asm in go world, but...

I don't know such a tool is exists or not. If you get information, let me know. Thanks.

As @Lomanic said, we have a few contributors and actually, I am very tough schedule in these months. (I always thank @Lomanic ) But, if you make a PR which...

Thank you for your contribution. Perhaps this is related to #809. I think this "Functional Options Pattern" is a solution of this bottle neck on Linux. But this kind of...

PR is always welcome!