On Fri, Jul 22 2016, NeilBrown wrote: > > Looking at the current code, __GFP_DIRECT_RECLAIM is disabled the first > time through, but if the pool is empty, direct-reclaim is allowed on the > next attempt. Presumably this is where the throttling comes in ?? I > suspect that it really shouldn't do that. It should leave kswapd to do > reclaim (so __GFP_KSWAPD_RECLAIM is appropriate) and only wait in > mempool_alloc where pool->wait can wake it up.
Actually, thinking about the kswapd connection, it might make sense for mempool_alloc() to wait in the relevant pgdata->pfmemalloc_wait as well as waiting on pool->wait. What way it should be able to proceed as soon as any memory is available. I don't know what the correct 'pgdata' is though. Just a thought, NeilBrown
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