Hi,
On Fri, Jun 12, 2020 at 09:31:12PM +0530, afzal mohammed wrote:
> 512 1K 4K 16K 32K 64K 1M
>
> normal 30 46 89 95 90 85 65
>
> uaccess_w_memcpy 28.545 85 92 91 85 65
>
> w/ series
Hi,
On Fri, Jun 12, 2020 at 11:19:23AM -0400, Nicolas Pitre wrote:
> On Fri, 12 Jun 2020, afzal mohammed wrote:
> > Performance wise, results are not encouraging, 'dd' on tmpfs results,
> Could you compare with CONFIG_UACCESS_WITH_MEMCPY as well?
512 1K 4K 16K
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:
Hi,
copy_{from,to}_user() uaccess helpers are implemented by user page
pinning, followed by temporary kernel mapping & then memcpy(). This
helps to achieve user page copy when current virtual address mapping
of the CPU excludes user pages.
Other uaccess routines are also planned to be modified to
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