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* [PATCH 0/2 v2] mm, slab: consolidate KMALLOC_MAX_SIZE
@ 2016-12-20 13:06 Michal Hocko
  2016-12-20 13:06 ` [PATCH 1/2] mm, slab: make sure that KMALLOC_MAX_SIZE will fit into MAX_ORDER Michal Hocko
  2016-12-20 13:06 ` [PATCH 2/2] bpf: do not use KMALLOC_SHIFT_MAX Michal Hocko
  0 siblings, 2 replies; 3+ messages in thread
From: Michal Hocko @ 2016-12-20 13:06 UTC (permalink / raw)
  To: Andrew Morton
  Cc: Cristopher Lameter, Alexei Starovoitov, Andrey Konovalov, netdev,
	linux-mm, LKML

Hi,
this is the second version of the patchset previously posted here [1].
Alexei has insisted on the patches reordering which I've done in this
series. I've also updated the changelog of the second patch to mention
why KMALLOC_SHIFT_MAX has been used.

Andrey has revealed a discrepancy between KMALLOC_MAX_SIZE and the
maximum supported page allocator size [2]. The underlying problem
should be fixed in the ep_write_iter code of course, but I do not feel
qualified to do that. The discrepancy which it reveals (see patch 2)
is worth fixing anyway, though.

While I was looking into the code, I've noticed that the only code which
uses KMALLOC_SHIFT_MAX outside of the slab code is bpf so I've updated
it to use KMALLOC_MAX_SIZE instead. There shouldn't be any real reason
to use KMALLOC_SHIFT_MAX which is a slab internal constant same as
KMALLOC_SHIFT_{LOW,HIGH}

[1] http://lkml.kernel.org/r/20161215164722.21586-1-mhocko@kernel.org
[2] http://lkml.kernel.org/r/CAAeHK+ztusS68DejO8AH3nn-EfiYQpD5FmBwmqKG8BWvoqPNqQ@mail.gm

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^ permalink raw reply	[flat|nested] 3+ messages in thread

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Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-12-20 13:06 [PATCH 0/2 v2] mm, slab: consolidate KMALLOC_MAX_SIZE Michal Hocko
2016-12-20 13:06 ` [PATCH 1/2] mm, slab: make sure that KMALLOC_MAX_SIZE will fit into MAX_ORDER Michal Hocko
2016-12-20 13:06 ` [PATCH 2/2] bpf: do not use KMALLOC_SHIFT_MAX Michal Hocko

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