On 10/20/2016 03:33 PM, Michal Hocko wrote:
On Thu 20-10-16 14:11:49, Vlastimil Babka wrote:
[...]
Hi, I'm wondering if people would find this useful. If you think it is, and
to not make performance worse, I could also make sure in proper submission
that values are not read via global_page_state() multiple times etc...
I definitely find this information useful and hate to do the math all
the time but on the other hand this is quite fragile and I can imagine
we can easily forget to add something there and provide a misleading
information to the userspace. So I would be worried with a long term
maintainability of this.
I wouldn't fear this that much. Maybe even on the contrary - if we unknowingly
change the picture by misacounting something, or changing a counter to become
subset of another, and Unaccounted starts to give weird values, it will give us
hint that there's either a problem to fix, or a missed documentation update.
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