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Re: [Nbd] [PATCH 2/4] mm: introduce memalloc_noreclaim_{save, restore}

On April 05, 2017 3:47 PM Vlastimil Babka wrote: 
> The previous patch has shown that simply setting and clearing PF_MEMALLOC in
> current->flags can result in wrongly clearing a pre-existing PF_MEMALLOC flag
> and potentially lead to recursive reclaim. Let's introduce helpers that support
> proper nesting by saving the previous stat of the flag, similar to the existing
> memalloc_noio_* and memalloc_nofs_* helpers. Convert existing setting/clearing
> of PF_MEMALLOC within mm to the new helpers.
> There are no known issues with the converted code, but the change makes it more
> robust.
> Suggested-by: Michal Hocko <mhocko@...1750...>
> Signed-off-by: Vlastimil Babka <vbabka@...1290...>
> ---

Acked-by: Hillf Danton <hillf.zj@...2873...>

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