Hiroyuki KAMEZAWA [off-list ref] wrote:

In the previous version, I used SetPagePrivate()/ClearPagePrivate()/PagePrivate().
But these are "atomic" operation and looks very slow.
This is why I doesn't used these macros in this version.

My previous version, which used set_bit/test_bit/clear_bit, shows very bad performance
on my test, and I replaced it.

That's surprising.  But if you do intend to use non-atomic bitops then
please add __SetPagePrivate() and __ClearPagePrivate()
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