On 21.10.24 17:41, Suren Baghdasaryan wrote:
On Mon, Oct 21, 2024 at 8:34 AM Michal Hocko <mhocko@xxxxxxxx> wrote:
On Mon 21-10-24 08:05:16, Suren Baghdasaryan wrote:
[...]
Yeah, I thought about adding new values to "mem_profiling" but it's a
bit complicated. Today it's a tristate:
mem_profiling=0|1|never
0/1 means we disable/enable memory profiling by default but the user
can enable it at runtime using a sysctl. This means that we enable
page_ext at boot even when it's set to 0.
"never" means we do not enable page_ext, memory profiling is disabled
and sysctl to enable it will not be exposed. Used when a distribution
has CONFIG_MEM_ALLOC_PROFILING=y but the user does not use it and does
not want to waste memory on enabling page_ext.
I can add another option like "pgflags" but then it also needs to
specify whether we should enable or disable profiling by default
(similar to 0|1 for page_ext mode). IOW we will need to encode also
the default state we want. Something like this:
mem_profiling=0|1|never|pgflags_on|pgflags_off
Would this be acceptable?
Isn't this overcomplicating it? Why cannot you simply go with
mem_profiling={0|never|1}[,$YOUR_OPTIONS]
While $YOUR_OPTIONS could be compress,fallback,ponies and it would apply
or just be ignored if that is not applicable.
Oh, you mean having 2 parts in the parameter with supported options being:
mem_profiling=never
mem_profiling=0
mem_profiling=1
mem_profiling=0,pgflags
mem_profiling=1,pgflags
That's also a viable solution indeed.
--
Cheers,
David / dhildenb
