Balbir Singh wrote:
[snip]
>>>> + for_each_online_node(node) {
>>>> +#ifdef CONFIG_HIGHMEM
>>>> + zones = NODE_DATA(node)->node_zonelists[ZONE_HIGHMEM].zones;
>>>> + if (do_try_to_free_pages(zones, sc.gfp_mask, &sc))
>>>> + return 1;
>>>> +#endif
>>>> + zones = NODE_DATA(node)->node_zonelists[ZONE_NORMAL].zones;
>>>> + if (do_try_to_free_pages(zones, sc.gfp_mask, &sc))
>>>> + return 1;
>>>> + }
>>> Definitely need to handle ZONE_DMA32 and ZONE_DMA (some architectures put
>>> all memory into ZONE_DMA (or they used to))
>
> Won't the node_zonelists[ZONE_NORMAL].zones contain all lower zones (including
> ZONE_DMA and ZONE_DMA32) from various nodes organized by cost?
>
> I need to go lookup the node_zonelists creation.
OK, I've got it. The node's zonelist indexed with ZONE_XXX contains
the zone specified and all the zones beyond it. Thus shrinking from
ZONE_HIGHMEM (ZONE_NORMAL if the latter does not exist) is enough.
Thanks,
Pavel
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