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+0fDuHlmx2Hfv0/3U9GsQpxf8mMnIguNjIjxvs1pf4+5anivocjKCRmN/KLC/+IEBeL2OQe8NsxjHqAArFhPvSuPGnDnERd5uC6ILqGP4d/EVYuCjFywh4ySeCp6civTTnJ/Obm5RXBACWfNtOFhUVx+tMqYL+8NeO5YEwedeMW6axxn+kW80ej5ALOpBuKF0Wjdq5BOiAGI2sUc= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 1/17/2023 4:44 PM, David Hildenbrand wrote: > On 16.01.23 03:25, Raghavendra K T wrote: >>   During the Numa scanning make sure only relevant vmas of the >> tasks are scanned. >> >> Logic: >> 1) For the first two time allow unconditional scanning of vmas >> 2) Store recent 4 unique tasks (last 8bits of PIDs) accessed the vma. >>    False negetives in case of collison should be fine here. >> 3) If more than 4 pids exist assume task indeed accessed vma to >>   to avoid false negetives >> >> Co-developed-by: Bharata B Rao >> (initial patch to store pid information) >> >> Suggested-by: Mel Gorman >> Signed-off-by: Bharata B Rao >> Signed-off-by: Raghavendra K T >> --- >>   include/linux/mm_types.h |  2 ++ >>   kernel/sched/fair.c      | 32 ++++++++++++++++++++++++++++++++ >>   mm/memory.c              | 21 +++++++++++++++++++++ >>   3 files changed, 55 insertions(+) >> >> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h >> index 500e536796ca..07feae37b8e6 100644 >> --- a/include/linux/mm_types.h >> +++ b/include/linux/mm_types.h >> @@ -506,6 +506,8 @@ struct vm_area_struct { >>       struct mempolicy *vm_policy;    /* NUMA policy for the VMA */ >>   #endif >>       struct vm_userfaultfd_ctx vm_userfaultfd_ctx; >> +    unsigned int accessing_pids; >> +    int next_pid_slot; >>   } __randomize_layout; > > What immediately jumps at me is the unconditional grow of a VMA by 8 > bytes. A process with 64k mappings consumes 512 KiB more of memory, > possibly completely unnecessarily. > > This at least needs to be fenced by CONFIG_NUMA_BALANCING. > Thanks for the review David. Good point.. I do agree. I see I will have to fence further in memory.c only since fair.c is already taken care.