Re: [HMM 12/15] mm/migrate: new memory migration helper for use with device memory v4

[Evgeny Baskakov]

On 7/14/17 5:55 PM, Jerome Glisse wrote:
> So pushed an updated hmm-next branch this should fix all issues you had.
> Thought i am not sure about the test in this mail, all i see is that it
> continously spit error messages but it does not hang (i let it run 20min
> or so). Dunno if that is what expected. Let me know if this is still an
> issue and if so what should be the expected output of this test program.
>
> Cheers,
> JÃrÃme

Thanks, Jerome. The kernel hang indeed seems to be fixed.

Regarding the last issue I reported. It still persists. The test program 
should eventually exit. Instead, it loops indefinitely (sorry, I was not 
clear when I called it 'app-side hang').

This is what's expected. The number of error messages can be random, but 
must be finite; the program must print "OK" at the end:

$ ./run.sh
&&& 1 migrate threads: STARTING
iteration 0
thread 0 is migrating 10000 pages starting from 0x7f6abce79000
migrate_thread_func:87: failed to migrate pages at 0x7f6abce79000 
(migrate.npages (tid 0): 9725 != npages: 10000)
thread 0 is migrating 10000 pages starting from 0x7f6abce79000
thread 0 is migrating 10000 pages starting from 0x7f6abce79000
&&& 1 migrate threads: PASSED
(OK)[./sanity_rmem004] anon migration read test

Thanks,

--
Evgeny Baskakov
NVIDIA