[PATCH v2 0/5] kdump: crashkernel reservation from CMA

[Michal Hocko]

On Thu 29-05-25 09:46:28, Michal Hocko wrote:
> On Wed 28-05-25 23:01:04, David Hildenbrand wrote:
> [...]
> > I think we just have to be careful to document it properly -- especially the
> > shortcomings and that this feature might become a problem in the future.
> > Movable user-space page tables getting placed on CMA memory would probably
> > not be a problem if we don't care about ... user-space data either way.
> 
> I think makedumpfile could refuse to capture a dump if userspace memory
> is requested to enforce this.
> 
> > The whole "Direct I/O takes max 1s" part is a bit shaky. Maybe it could be
> > configurable how long to wait? 10s is certainly "safer".
> 
> Quite honestly we will never know and rather than making this
> configurable I would go with reasonably large. Couple of seconds
> certainly do not matter for the kdump situations but I would go as far

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> as minutes.

-- 
Michal Hocko
SUSE Labs