[PATCH 0/2 v3] Make task in balance_dirty_pages() killable

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  Hello,

  since the discussion has calmed down, here is a third iteration of the patches.
Fengguang, can you put them into your tree and merge them with Linus? Thanks.

Changes since v2:
* removed return value of balance_dirty_pages() since it didn't seem that
  useful after all.
* kept fatal_signal_pending() check in generic_perform_write() since I don't think
  possible partial writes when app receives SIGKILL are a problem.

Changes since v1:
* slightly moved the check in balance_dirty_pages() as Fengguang requested
* made balance_dirty_pages() return EINTR if fatal signal was detected
* changed check for signal to check for fatal signal in generic_perform_write()
  to avoid unexpected results for userspace applications.

									Honza
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