linux-kernel - Re: [PATCH v10 1/3] mm: Shuffle initial free memory to improve memory-side-cache utilization

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Message-Id: <20190205140415.544ae2876ee44e6edb8ca743@linux-foundation.org>
Date:   Tue, 5 Feb 2019 14:04:15 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Michal Hocko <mhocko@...e.com>,
        Kees Cook <keescook@...omium.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, keith.busch@...el.com
Subject: Re: [PATCH v10 1/3] mm: Shuffle initial free memory to improve
 memory-side-cache utilization

On Thu, 31 Jan 2019 21:15:17 -0800 Dan Williams <dan.j.williams@...el.com> wrote:

> +config SHUFFLE_PAGE_ALLOCATOR
> +	bool "Page allocator randomization"
> +	default SLAB_FREELIST_RANDOM && ACPI_NUMA
> +	help

SLAB_FREELIST_RANDOM is default n, so this patchset won't get much
runtime testing.

How about you cook up a (-mm only) patch which makes the kernel default
to SLAB_FREELIST_RANDOM=y, SHUFFLE_PAGE_ALLOCATOR=y (or whatever) to
ensure we get a decent amount of runtime testing?  Then I can hold that
in -mm (and -next) until we get bored of it?