Re: [PATCH] arm64: Increase the max granular size

From	Christoph Lameter <cl@linux.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] arm64: Increase the max granular size
Date	2015-11-04 15:00 +0100
Message-ID	<qr6Lx-19D-29@gated-at.bofh.it> (permalink)
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On Wed, 4 Nov 2015, Catalin Marinas wrote:

> The simplest option would be to make sure that off slab isn't allowed
> for caches of KMALLOC_MIN_SIZE or smaller, with the drawback that not
> only "kmalloc-128" but any other such caches will be on slab.

The reason for an off slab configuration is denser object packing.

> I think a better option would be to first check that there is a
> kmalloc_caches[] entry for freelist_size before deciding to go off-slab.

Hmmm.. Yes seems to be an option.

Maybe we simply revert commit 8fc9cf420b36 instead? That does not seem to
make too much sense to me and the goal of the commit cannot be
accomplished on ARM. Your patch essentially reverts the effect anyways.

Smaller slabs really do not need off slab management anyways since they
will only loose a few objects per slab page.
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Thread

Re: [PATCH] arm64: Increase the max granular size Catalin Marinas <catalin.marinas@arm.com> - 2015-11-03 13:10 +0100
  Re: [PATCH] arm64: Increase the max granular size Catalin Marinas <catalin.marinas@arm.com> - 2015-11-03 15:40 +0100
    Re: [PATCH] arm64: Increase the max granular size Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-03 16:00 +0100
      Re: [PATCH] arm64: Increase the max granular size Catalin Marinas <catalin.marinas@arm.com> - 2015-11-03 20:00 +0100
        Re: [PATCH] arm64: Increase the max granular size Christoph Lameter <cl@linux.com> - 2015-11-04 00:40 +0100
          Re: [PATCH] arm64: Increase the max granular size Catalin Marinas <catalin.marinas@arm.com> - 2015-11-04 13:40 +0100
            Re: [PATCH] arm64: Increase the max granular size Christoph Lameter <cl@linux.com> - 2015-11-04 15:00 +0100
              Re: [PATCH] arm64: Increase the max granular size Catalin Marinas <catalin.marinas@arm.com> - 2015-11-04 16:00 +0100
                Re: [PATCH] arm64: Increase the max granular size Christoph Lameter <cl@linux.com> - 2015-11-04 16:30 +0100
                Re: [PATCH] arm64: Increase the max granular size Catalin Marinas <catalin.marinas@arm.com> - 2015-11-04 16:40 +0100
                Re: [PATCH] arm64: Increase the max granular size Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2015-11-05 05:40 +0100
                [PATCH] mm: slab: Only move management objects off-slab for sizes larger than KMALLOC_MIN_SIZE Catalin Marinas <catalin.marinas@arm.com> - 2015-11-05 13:00 +0100
                Re: [PATCH] mm: slab: Only move management objects off-slab for  sizes larger than KMALLOC_MIN_SIZE Andrew Morton <akpm@linux-foundation.org> - 2015-11-05 14:30 +0100
                Re: [PATCH] mm: slab: Only move management objects off-slab for  sizes larger than KMALLOC_MIN_SIZE Catalin Marinas <catalin.marinas@arm.com> - 2015-11-05 17:10 +0100
                Re: [PATCH] mm: slab: Only move management objects off-slab for sizes  larger than KMALLOC_MIN_SIZE Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-06 14:10 +0100
                Re: [PATCH] mm: slab: Only move management objects off-slab for  sizes larger than KMALLOC_MIN_SIZE Christoph Lameter <cl@linux.com> - 2015-11-05 18:40 +0100

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