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| Started by | Geert Uytterhoeven <geert@linux-m68k.org> |
|---|---|
| First post | 2016-06-14 15:20 +0200 |
| Last post | 2016-06-14 15:20 +0200 |
| Articles | 1 — 1 participant |
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Re: Boot failure on emev2/kzm9d (was: Re: [PATCH v2 11/11] mm/slab: lockless decision to grow cache) Geert Uytterhoeven <geert@linux-m68k.org> - 2016-06-14 15:20 +0200
| From | Geert Uytterhoeven <geert@linux-m68k.org> |
|---|---|
| Date | 2016-06-14 15:20 +0200 |
| Subject | Re: Boot failure on emev2/kzm9d (was: Re: [PATCH v2 11/11] mm/slab: lockless decision to grow cache) |
| Message-ID | <rJWq5-5jT-17@gated-at.bofh.it> |
Hi Jonsoo,
On Mon, Jun 13, 2016 at 9:43 PM, Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> On Tue, Apr 12, 2016 at 6:51 AM, <js1304@gmail.com> wrote:
>> From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
>> To check whther free objects exist or not precisely, we need to grab a
>> lock. But, accuracy isn't that important because race window would be
>> even small and if there is too much free object, cache reaper would reap
>> it. So, this patch makes the check for free object exisistence not to
>> hold a lock. This will reduce lock contention in heavily allocation case.
>> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
>
> I've bisected a boot failure (no output at all) in v4.7-rc2 on emev2/kzm9d
> (Renesas dual Cortex A9) to this patch, which is upstream commit
> 801faf0db8947e01877920e848a4d338dd7a99e7.
BTW, when disabling SMP, the problem goes away.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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