Re: [PATCH v3] mm: introduce reference pages
From: Matthew Wilcox <willy@infradead.org>
Date: 2020-08-18 03:00:36
Also in:
linux-api, linux-doc, linux-mm
On Mon, Aug 17, 2020 at 07:31:39PM -0700, John Hubbard wrote:
quoted
Real time (s) Max RSS (KiB) anon 2.237081 107088 memset 2.252241 112180 refpage 2.243786 107128 We can see that RSS for refpage is almost the same as anon, and real time overhead is 44% that of memset.Are some of the numbers stale, maybe? Try as I might, I cannot combine anything above to come up with 44%. :)
You're not trying hard enough ;-) (2.252241 - 2.237081) / 2.237081 = .00677668801442594166 (2.243786 - 2.237081) / 2.237081 = .00299720930981041812 .00299720930981041812 / .00677668801442594166 = .44228232189973614648 tadaa! As I said last time this was posted, I'm just not excited by this. We go from having a 0.68% time overhead down to an 0.30% overhead, which just doesn't move the needle for me. Maybe there's a better benchmark than this to show benefits from this patchset. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel