[PATCH v6] powerpc/pseries/vas: Use usleep_range() to support HCALL delay

[Michael Ellerman]

On Mon, 15 Jan 2024 21:59:10 -0800, Haren Myneni wrote:
> VAS allocate, modify and deallocate HCALLs returns
> H_LONG_BUSY_ORDER_1_MSEC or H_LONG_BUSY_ORDER_10_MSEC for busy
> delay and expects OS to reissue HCALL after that delay. But using
> msleep() will often sleep at least 20 msecs even though the
> hypervisor suggests OS reissue these HCALLs after 1 or 10msecs.
> 
> The open and close VAS window functions hold mutex and then issue
> these HCALLs. So these operations can take longer than the
> necessary when multiple threads issue open or close window APIs
> simultaneously, especially might affect the performance in the
> case of repeat open/close APIs for each compression request.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/pseries/vas: Use usleep_range() to support HCALL delay
      https://git.kernel.org/powerpc/c/43ac9f5cd457bb01930f87448ddaaae455f8a8cf

cheers