On Thu, Nov 12, 2015 at 04:53:38PM +0100, mho...@kernel.org wrote: > From: Michal Hocko <mho...@suse.com> > > __alloc_pages_high_priority doesn't do anything special other than it > calls get_page_from_freelist and loops around GFP_NOFAIL allocation > until it succeeds. It would be better if the first part was done in > __alloc_pages_slowpath where we modify the zonelist because this would > be easier to read and understand. And do the retry at the very same > place because retrying without even attempting to do any reclaim is > fragile because we are basically relying on somebody else to make the > reclaim (be it the direct reclaim or OOM killer) for us. The caller > might be holding resources (e.g. locks) which block other other > reclaimers from making any progress for example. > > Remove the helper and open code it into its only user. We have to be > careful about __GFP_NOFAIL allocations from the PF_MEMALLOC context > even though this is a very bad idea to begin with because no progress > can be gurateed at all. We shouldn't break the __GFP_NOFAIL semantic > here though. It could be argued that this is essentially GFP_NOWAIT > context which we do not support but PF_MEMALLOC is much harder to check > for existing users because they might happen deep down the code path > performed much later after setting the flag so we cannot really rule out > there is no kernel path triggering this combination. > > Signed-off-by: Michal Hocko <mho...@suse.com>
Acked-by: Mel Gorman <mgor...@suse.de> -- Mel Gorman SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
