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Tracking soft dirty bit when a page goes to a swap is tricky Source Code for Linux v2.13.6.

Control register SYS_RESETCTL Bit 8 is set to 1 to force a soft reset.

Set soft dirty bit so we can notice in userspace the ptes were moved.

The same hidden bit is used by kmemcheck, but since kmemcheck works on kernel pages while soft-dirty engine on user space, they do not conflict with each other.