Public bug reported:
[Impact]
As described in bug 1823753, failures to allocate DMA out of CMA space can
result in ~10K cma_alloc() error messages. While non-fatal (the code falls back
to allocating memory out of non-CMA space), the error messages themselves can
be a problem - esp. for systems w/ slow consoles like the HP m400 (9600 baud).
It slows down boot so much that MAAS deploys fail due to timeout.
[Test Case]
Boot the disco kernel on an HP m400 or a HiSilicon D06 w/ the SMMU disabled in
the BIOS.
[Fix]
Ratelimit the messages.
[Regression Risk]
Minimal - we're just attempting to quiescing log spew.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Affects: linux (Ubuntu Disco)
Importance: Undecided
Status: Incomplete
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1828092
Title:
ratelimit cma_alloc messages
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