On Wed, 26 Sep 2018 08:36:47 -0700 Dave Hansen <dave.hansen(a)intel.com> wrote:
On 09/26/2018 12:38 AM, Michal Hocko wrote:
> Why cannot you simply go with [no]vm_page_poison[=on/off]?
I was trying to look to the future a bit, if we end up with five or six
more other options we want to allow folks to enable/disable. I don't
want to end up in a situation where we have a bunch of different knobs
to turn all this stuff off at runtime.
I'd really like to have one stop shopping so that folks who have a
system that's behaving well and don't need any debugging can get some of
their performance back.
But, the *primary* thing we want here is a nice, quick way to turn as
much debugging off as we can. A nice-to-have is a future-proof,
slub-style option that will centralize things.
Yup. DEBUG_VM just covers too much stuff nowadays. A general way to
make these thing more fine-grained and without requiring a rebuild
would be great.
And I expect that quite a few of the debug features could be
enabled/disabled after bootup as well, so a /proc knob is probably in
our future. Any infrastructure which is added to support a new
kernel-command-line option should be designed with that in mind.