Is anything similar to deferrable timer interface available to userspace applications?
No. Deferrable timer is implemented over kernel per CPU timer infrastructure and it cannot be directly exported to user as a system level timer. Further, there can be potential ordering related issues with different timers running on different CPUs and one getting deferred while the other one fires out of order.
Does force hpet patchset detect HPET on all platforms?
No. The patchset pointed to here enables it only for ICH based platforms. However, it adds infrastructure code in kernel which can be used to enable HPET on any platform, once it is detected. There are some patches to detect it on few other chipsets as well. If your chipset is not supported you will have to check with your chipset vendor to get the documentation for detecting HPET and that support will have to be added to the kernel separately.
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