[Xen-devel] performance regression from c/s 21647:cfba1560054a

["Jan Beulich" <JBeulich@xxxxxxxx>]

Stefano, Gianluca,

in this c/s you did, besides the main purpose of the change, an
adjustment to check_for_early_unshadow() in that L2...L4 entries
would no longer be attempted to get unshadowed. Neither the
patch description nor the added comment really make clear why
this was done, and we now got a customer report regarding this
causing considerable slowdown in process creation/destruction
intensive workloads (e.g. shell scripts).

Would you explain that change, and whether it is reasonable to
revert that part of said c/s?

Thanks, Jan


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