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authorLinus Torvalds <torvalds@linux-foundation.org>2021-09-03 20:08:28 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-03 20:08:28 +0300
commit14726903c835101cd8d0a703b609305094350d61 (patch)
tree5cdcf5d2f06ca14be76efd33a4de0e3b28a70de0 /Documentation/ABI
parenta9c9a6f741cdaa2fa9ba24a790db8d07295761e3 (diff)
parentd5fffc5aff269717a035baa087630adca612a6c4 (diff)
downloadlinux-14726903c835101cd8d0a703b609305094350d61.tar.xz
Merge branch 'akpm' (patches from Andrew)
Merge misc updates from Andrew Morton: "173 patches. Subsystems affected by this series: ia64, ocfs2, block, and mm (debug, pagecache, gup, swap, shmem, memcg, selftests, pagemap, mremap, bootmem, sparsemem, vmalloc, kasan, pagealloc, memory-failure, hugetlb, userfaultfd, vmscan, compaction, mempolicy, memblock, oom-kill, migration, ksm, percpu, vmstat, and madvise)" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (173 commits) mm/madvise: add MADV_WILLNEED to process_madvise() mm/vmstat: remove unneeded return value mm/vmstat: simplify the array size calculation mm/vmstat: correct some wrong comments mm/percpu,c: remove obsolete comments of pcpu_chunk_populated() selftests: vm: add COW time test for KSM pages selftests: vm: add KSM merging time test mm: KSM: fix data type selftests: vm: add KSM merging across nodes test selftests: vm: add KSM zero page merging test selftests: vm: add KSM unmerge test selftests: vm: add KSM merge test mm/migrate: correct kernel-doc notation mm: wire up syscall process_mrelease mm: introduce process_mrelease system call memblock: make memblock_find_in_range method private mm/mempolicy.c: use in_task() in mempolicy_slab_node() mm/mempolicy: unify the create() func for bind/interleave/prefer-many policies mm/mempolicy: advertise new MPOL_PREFERRED_MANY mm/hugetlb: add support for mempolicy MPOL_PREFERRED_MANY ...
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+What: /sys/kernel/mm/numa/
+Date: June 2021
+Contact: Linux memory management mailing list <linux-mm@kvack.org>
+Description: Interface for NUMA
+
+What: /sys/kernel/mm/numa/demotion_enabled
+Date: June 2021
+Contact: Linux memory management mailing list <linux-mm@kvack.org>
+Description: Enable/disable demoting pages during reclaim
+
+ Page migration during reclaim is intended for systems
+ with tiered memory configurations. These systems have
+ multiple types of memory with varied performance
+ characteristics instead of plain NUMA systems where
+ the same kind of memory is found at varied distances.
+ Allowing page migration during reclaim enables these
+ systems to migrate pages from fast tiers to slow tiers
+ when the fast tier is under pressure. This migration
+ is performed before swap. It may move data to a NUMA
+ node that does not fall into the cpuset of the
+ allocating process which might be construed to violate
+ the guarantees of cpusets. This should not be enabled
+ on systems which need strict cpuset location
+ guarantees.