On 2020-10-14 12:56 p.m., Borislav Petkov wrote:
On Wed, Oct 14, 2020 at 01:32:55AM -0700, Ankur Arora wrote:
This can potentially improve page-clearing bandwidth (see below for
performance numbers for two microarchitectures where it helps and one
where it doesn't) and can help indirectly by con
On Wed, Oct 14, 2020 at 01:32:55AM -0700, Ankur Arora wrote:
> This can potentially improve page-clearing bandwidth (see below for
> performance numbers for two microarchitectures where it helps and one
> where it doesn't) and can help indirectly by consuming less cache
> resources.
>
> Any perfor
Add clear_page_nt() which is essentially an unrolled MOVNTI loop. The
unrolling keeps the inner loop similar to memset_movnti() which can be
exercised via perf bench mem memset.
The caller needs to execute an SFENCE when done.
MOVNTI, from the Intel SDM, Volume 2B, 4-101:
"The non-temporal hint
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