Ard Biesheuvel 005f78cd88 arm64: defer reloading a task's FPSIMD state to userland resume ... If a task gets scheduled out and back in again and nothing has touched its FPSIMD state in the mean time, there is really no reason to reload it from memory. Similarly, repeated calls to kernel_neon_begin() and kernel_neon_end() will preserve and restore the FPSIMD state every time. This patch defers the FPSIMD state restore to the last possible moment, i.e., right before the task returns to userland. If a task does not return to userland at all (for any reason), the existing FPSIMD state is preserved and may be reused by the owning task if it gets scheduled in again on the same CPU. This patch adds two more functions to abstract away from straight FPSIMD register file saves and restores: - fpsimd_restore_current_state -> ensure current's FPSIMD state is loaded - fpsimd_flush_task_state -> invalidate live copies of a task's FPSIMD state Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>		2014-05-08 11:31:57 +02:00
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asm	arm64: defer reloading a task's FPSIMD state to userland resume	2014-05-08 11:31:57 +02:00
uapi/asm	ARM64: perf: add support for perf registers API	2014-03-13 11:22:37 +00:00