Re: [RFC 0/3] ARM: copy_{from,to}_user() for vmsplit 4g/4g
From: Nicolas Pitre <nico@fluxnic.net>
Date: 2020-06-12 15:19:34
Also in:
linux-mm, lkml
On Fri, 12 Jun 2020, afzal mohammed wrote:
Performance wise, results are not encouraging, 'dd' on tmpfs results, ARM Cortex-A8, BeagleBone White (256MiB RAM): w/o series - ~29.5 MB/s w/ series - ~20.5 MB/s w/ series & highmem disabled - ~21.2 MB/s On Cortex-A15(2GiB RAM) in QEMU: w/o series - ~4 MB/s w/ series - ~2.6 MB/s Roughly a one-third drop in performance. Disabling highmem improves performance only slightly.
Could you compare with CONFIG_UACCESS_WITH_MEMCPY as well? Nicolas _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel