Messages in this thread | | | Date | Tue, 26 Apr 2022 09:40:23 +0200 | From | Michal Hocko <> | Subject | Re: [PATCH v2 8/8] mm: Centralize & improve oom reporting in show_mem.c |
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On Tue 26-04-22 03:26:12, Kent Overstreet wrote: [...] > Anyways, the reason I think this allocation is fine is it's GFP_NOWAIT and it's > completely fine if it fails - all we lose is some diagnostics, and also it's > released right away.
I think you are still missing the PF_MEMALLOC point. Please have a look how this leads to no reclaim recursion so GFP_NOWAIT has no meaning when you are allocating from PF_MEMALLOC context (which the oom killer and any reclaim path is). Also have a look at how __gfp_pfmemalloc_flags makes the allocation request from that context ALLOC_NO_WATERMARKS. See? -- Michal Hocko SUSE Labs
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