Messages in this thread | | | From | Michal Hocko <> | Subject | [RFC 0/2] GFP_NOFAIL cleanups | Date | Wed, 23 Nov 2016 07:49:23 +0100 |
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Hi, Tetsuo has noticed [1] that recent changes have changed GFP_NOFAIL semantic for costly order requests. I believe that the primary reason why this happened is that our GFP_NOFAIL checks are too scattered and it is really easy to forget about adding one. That's why I am proposing patch 1 which consolidates all the nofail handling at a single place. This should help to make this code better maintainable.
Patch 2 on top is a further attempt to make GFP_NOFAIL semantic less surprising. As things stand currently GFP_NOFAIL overrides the oom killer prevention code which is both subtle and not really needed. The patch 2 has more details about issues this might cause.
I would consider both patches more a cleanup than anything else. Any feedback is highly appreciated.
[1] http://lkml.kernel.org/r/1479387004-5998-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp
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