netdev - Re: [dm-devel] [PATCH v5] fault-injection: introduce kvmalloc fallback options

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Message-ID: <alpine.LRH.2.02.1804261006120.32722@file01.intranet.prod.int.rdu2.redhat.com>
Date:   Thu, 26 Apr 2018 10:28:45 -0400 (EDT)
From:   Mikulas Patocka <mpatocka@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
cc:     James Bottomley <James.Bottomley@...senPartnership.com>,
        David Rientjes <rientjes@...gle.com>, dm-devel@...hat.com,
        eric.dumazet@...il.com, mst@...hat.com, netdev@...r.kernel.org,
        jasowang@...hat.com, Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        linux-mm@...ck.org, edumazet@...gle.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        virtualization@...ts.linux-foundation.org,
        David Miller <davem@...emloft.net>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [dm-devel] [PATCH v5] fault-injection: introduce kvmalloc fallback
 options



On Thu, 26 Apr 2018, Michal Hocko wrote:

> On Wed 25-04-18 18:42:57, Mikulas Patocka wrote:
> > 
> > 
> > On Wed, 25 Apr 2018, James Bottomley wrote:
> [...]
> > > Kconfig proliferation, conversely, is a bit of a nightmare from both
> > > the user and the tester's point of view, so we're trying to avoid it
> > > unless absolutely necessary.
> > > 
> > > James
> > 
> > I already offered that we don't need to introduce a new kernel option and 
> > we can bind this feature to any other kernel option, that is enabled in 
> > the debug kernel, for example CONFIG_DEBUG_SG. Michal said no and he said 
> > that he wants a new kernel option instead.
> 
> Just for the record. I didn't say I _want_ a config option. Do not
> misinterpret my words. I've said that a config option would be
> acceptable if there is no way to deliver the functionality via kernel
> package automatically. You haven't provided any argument that would
> explain why the kernel package cannot add a boot option. Maybe there are
> some but I do not see them right now.

AFAIK Grub doesn't load per-kernel options from a per-kernel file. Even if 
we hacked grub scripts to add this option, other distributions won't.

Mikulas