which suggests that the patch is incomplete and that I am blind :/
mem_cgroup_cache_charge calls __mem_cgroup_try_charge for the page cache
and that one doesn't check GFP_MEMCG_NO_OOM. So you need the following
follow-up patch on top of the one you already have (which should catch
all the remaining cases).
Sorry about that...

This was, again, killing my MySQL server (search for "(mysqld)"):
http://www.watchdog.sk/lkml/oom_mysqld5

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