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Ananiev, Leonid I writes:
> Nikita Danilov writes:
> > Wouldn't this interfere with current->backing_dev_info logic?
>
> The proposed patch does not modify that logic.
Indeed, it *interferes* with it: in the original code, process doing
direct reclaim during balance_dirty_pages()
generic_file_write()->balance_dirty_pages()->...->__alloc_pages()->...->pageout()
performs page-out even if queue is congested. Intent of this is to
throttle writers, and reduce risk of running oom (certain file systems,
especially ones with delayed allocation, tend to allocate a lot of
memory in balance_dirty_pages()->writepages() paths).
Your patch breaks this mechanism.
Nikita.
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