Στις 26/06/2017 08:46 πμ, ο Michal Hocko έγραψε:
Unfortunatelly, this is not something that can be applied in general. This can lead to a premature OOM killer invocations. E.g. a direct write to the block device cannot use highmem, yet there won't be anything to throttle those writes properly. Unfortunately, our documentation is silent about this setting. I will post a patch later.
I should also note that highmem_is_dirtyable was 0 in all the 3.x kernel tests that I did; yet they didn't have the "slow disk writes" issue.
I.e. I think that setting highmem_is_dirtyable=1 works around the issue, but is not the exact point which caused the regression that we see in 4.x kernels...
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