On 30.05.25 11:07, Michal Hocko wrote:
On Fri 30-05-25 10:39:39, David Hildenbrand wrote:
On 30.05.25 10:28, Michal Hocko wrote:
[...]
All that being said I would go with an additional parameter to the
kdump cma setup - e.g. cma_sane_dma that would skip waiting and use 10s
otherwise. That would make the optimized behavior opt in, we do not need
to support all sorts of timeouts and also learn if this is not
sufficient.
Makes sense?
Just so I understand correctly, you mean extending the "crashkernel=" option
with a boolean parameter? If set, e.g., wait 1s, otherwise magic number 10?
crashkernel=1G,cma,cma_sane_dma # no wait on transition
But is no wait ok? I mean, any O_DIRECT with any device would at least
take a bit, no?
Of course, there is a short time between the crash and actually
triggerying kdump.
crashkernel=1G,cma # wait on transition with e.g. 10s timeout
In general, would work for me.
--
Cheers,
David / dhildenb
