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Groups > linux.kernel > #1649646
| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RFC PATCH 2/2] mm, memory_hotplug: drop CONFIG_MOVABLE_NODE |
| Date | 2017-05-24 16:00 +0200 |
| Message-ID | <tKEZs-33S-15@gated-at.bofh.it> (permalink) |
| References | <tKDAm-2jq-7@gated-at.bofh.it> <tKDAm-2jq-11@gated-at.bofh.it> <tKEG6-2V1-19@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed 24-05-17 15:30:17, Igor Mammedov wrote: > On Wed, 24 May 2017 14:24:11 +0200 > Michal Hocko <mhocko@kernel.org> wrote: > > [...] > > index facc20a3f962..ec7d6ae01c96 100644 > > --- a/Documentation/admin-guide/kernel-parameters.txt > > +++ b/Documentation/admin-guide/kernel-parameters.txt > > @@ -2246,8 +2246,11 @@ > [...] > > + movable. This means that the memory of such nodes > > + will be usable only for movable allocations which > > + rules out almost all kernel allocations. Use with > > + caution! > maybe dumb question but, is it really true that kernel won't ever > do kernel allocations from movable zone? > > looking at kmalloc(slab): we can get here: > > get_page_from_freelist() -> > rmqueue() -> > __rmqueue() -> > __rmqueue_fallback() -> > find_suitable_fallback() > > and it might return movable fallback and page could be stolen from there. No, you are mixing movable/unmovable pageblocks and movable zones. Movable zone basically works the same way as the Highmem zone. Have a look at gfp_zone() and high_zoneidx usage in get_page_from_freelist -- Michal Hocko SUSE Labs
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[RFC PATCH 2/2] mm, memory_hotplug: drop CONFIG_MOVABLE_NODE Michal Hocko <mhocko@kernel.org> - 2017-05-24 14:30 +0200
Re: [RFC PATCH 2/2] mm, memory_hotplug: drop CONFIG_MOVABLE_NODE Vlastimil Babka <vbabka@suse.cz> - 2017-05-24 15:00 +0200
Re: [RFC PATCH 2/2] mm, memory_hotplug: drop CONFIG_MOVABLE_NODE Michal Hocko <mhocko@kernel.org> - 2017-05-24 15:50 +0200
Re: [RFC PATCH 2/2] mm, memory_hotplug: drop CONFIG_MOVABLE_NODE Vlastimil Babka <vbabka@suse.cz> - 2017-05-24 17:20 +0200
Re: [RFC PATCH 2/2] mm, memory_hotplug: drop CONFIG_MOVABLE_NODE Michal Hocko <mhocko@kernel.org> - 2017-05-25 08:30 +0200
Re: [RFC PATCH 2/2] mm, memory_hotplug: drop CONFIG_MOVABLE_NODE Vlastimil Babka <vbabka@suse.cz> - 2017-05-25 10:50 +0200
Re: [RFC PATCH 2/2] mm, memory_hotplug: drop CONFIG_MOVABLE_NODE Igor Mammedov <imammedo@redhat.com> - 2017-05-24 15:40 +0200
Re: [RFC PATCH 2/2] mm, memory_hotplug: drop CONFIG_MOVABLE_NODE Michal Hocko <mhocko@kernel.org> - 2017-05-24 16:00 +0200
Re: [RFC PATCH 2/2] mm, memory_hotplug: drop CONFIG_MOVABLE_NODE Reza Arbab <arbab@linux.vnet.ibm.com> - 2017-05-25 00:00 +0200
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