Re: [PATCH] perf bench mem: Always memset source before memcpy

Em Mon, Aug 10, 2020 at 03:34:04PM +0200, Vincent Whitchurch escreveu: > For memcpy, the source pages are memset to zero only when --cycles is > used. This leads to wildly different results with or without --cycles, > since all sources pages are likely to be mapped to the same zero page > without

[PATCH] perf bench mem: Always memset source before memcpy

For memcpy, the source pages are memset to zero only when --cycles is used. This leads to wildly different results with or without --cycles, since all sources pages are likely to be mapped to the same zero page without explicit writes. Before this fix: $ export cmd="./perf stat -e LLC-loads -- .