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[209.85.220.65]) by mx.google.com with SMTPS id 88sor1292632otx.136.2019.01.30.10.30.28 for (Google Transport Security); Wed, 30 Jan 2019 10:30:28 -0800 (PST) Received-SPF: pass (google.com: domain of dan.j.williams@intel.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@intel-com.20150623.gappssmtp.com header.s=20150623 header.b=JKpyZVHw; spf=pass (google.com: domain of dan.j.williams@intel.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=dan.j.williams@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=9j79+mJlVivCZg8r9eXgCwMYenun/QvjMBX1vH8qwVk=; b=JKpyZVHwBzbZoi3xFBOJzn2IbpF802PLabqHWw8ZD026IfIn5OszULaE+vwKkiPb3S o/QUb9/hfz1n2Y6gak73YSduWwoX9jik/GbhVfYtK/DSG7mHLVLqgU5vhonAtUF2jow+ L/38FpMlBqKHRgq6Hjwk5QvfkmtLNTw8xGz2Vpt5n/zOeBgZhvmBRLGfqr4WkF6KlIaZ hnQABc+30eTr722VZw3wwe+YZYrwRrWZc/rtNP/K5itYlVAQIxPwxbER+yLhyf6viRHS rcnIOmtzVlVFjfhdTF0es0jpUzl2S7LVV+g4hHtsF2yIqjKyHavd7Bmbyp+TBQhRpdsF 45HQ== X-Google-Smtp-Source: ALg8bN50PZrZSvg9p519hj+hk5qFch5Xc+sgKgpSmNfdxTt09IU1nK4fd3JVClOirb4JtDKnB6nQh9pcLz+sNphIw58= X-Received: by 2002:a9d:394:: with SMTP id f20mr22353389otf.98.1548873027799; Wed, 30 Jan 2019 10:30:27 -0800 (PST) MIME-Version: 1.0 References: <154882453052.1338686.16411162273671426494.stgit@dwillia2-desk3.amr.corp.intel.com> <154882453604.1338686.15108059741397800728.stgit@dwillia2-desk3.amr.corp.intel.com> <20190130064856.GB17937@rapoport-lnx> In-Reply-To: <20190130064856.GB17937@rapoport-lnx> From: Dan Williams Date: Wed, 30 Jan 2019 10:30:16 -0800 Message-ID: Subject: Re: [PATCH v9 1/3] mm: Shuffle initial free memory to improve memory-side-cache utilization To: Mike Rapoport Cc: Andrew Morton , Michal Hocko , Dave Hansen , Kees Cook , Linux MM , Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Jan 29, 2019 at 10:49 PM Mike Rapoport wrote: > > On Tue, Jan 29, 2019 at 09:02:16PM -0800, Dan Williams wrote: > > Randomization of the page allocator improves the average utilization of > > a direct-mapped memory-side-cache. Memory side caching is a platform > > capability that Linux has been previously exposed to in HPC > > (high-performance computing) environments on specialty platforms. In > > that instance it was a smaller pool of high-bandwidth-memory relative to > > higher-capacity / lower-bandwidth DRAM. Now, this capability is going to > > be found on general purpose server platforms where DRAM is a cache in > > front of higher latency persistent memory [1]. > > [ ... ] > > > Cc: Michal Hocko > > Cc: Dave Hansen > > Cc: Mike Rapoport > > Reviewed-by: Kees Cook > > Signed-off-by: Dan Williams > > --- > > include/linux/list.h | 17 ++++ > > include/linux/mmzone.h | 4 + > > include/linux/shuffle.h | 45 +++++++++++ > > init/Kconfig | 23 ++++++ > > mm/Makefile | 7 ++ > > mm/memblock.c | 1 > > mm/memory_hotplug.c | 3 + > > mm/page_alloc.c | 6 +- > > mm/shuffle.c | 188 +++++++++++++++++++++++++++++++++++++++++++++++ > > 9 files changed, 292 insertions(+), 2 deletions(-) > > create mode 100644 include/linux/shuffle.h > > create mode 100644 mm/shuffle.c > > ... > > > diff --git a/mm/memblock.c b/mm/memblock.c > > index 022d4cbb3618..c0cfbfae4a03 100644 > > --- a/mm/memblock.c > > +++ b/mm/memblock.c > > @@ -17,6 +17,7 @@ > > #include > > #include > > #include > > +#include > > Nit: does not seem to be required > > > #include > > #include > > #include Good catch. Notch one more line saved in the incremental diffstat from v8. I'll wait for Michal's thumbs up on the rest before re-spinning, or perhaps Andrew can drop this line on applying?