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c6123a19c9
If the new NUMA node onlined doesn't have a abstract distance assigned, the kernel adds the NUMA node to default memory tier. [aneesh.kumar@linux.ibm.com: fix kernel error with memory hotplug] Link: https://lkml.kernel.org/r/20220825092019.379069-1-aneesh.kumar@linux.ibm.com Link: https://lkml.kernel.org/r/20220818131042.113280-4-aneesh.kumar@linux.ibm.com Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: "Huang, Ying" <ying.huang@intel.com> Acked-by: Wei Xu <weixugc@google.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Bharata B Rao <bharata@amd.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Hesham Almatary <hesham.almatary@huawei.com> Cc: Jagdish Gediya <jvgediya.oss@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Tim Chen <tim.c.chen@intel.com> Cc: Yang Shi <shy828301@gmail.com> Cc: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
27 lines
819 B
C
27 lines
819 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_MEMORY_TIERS_H
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#define _LINUX_MEMORY_TIERS_H
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/*
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* Each tier cover a abstrace distance chunk size of 128
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*/
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#define MEMTIER_CHUNK_BITS 7
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#define MEMTIER_CHUNK_SIZE (1 << MEMTIER_CHUNK_BITS)
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/*
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* Smaller abstract distance values imply faster (higher) memory tiers. Offset
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* the DRAM adistance so that we can accommodate devices with a slightly lower
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* adistance value (slightly faster) than default DRAM adistance to be part of
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* the same memory tier.
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*/
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#define MEMTIER_ADISTANCE_DRAM ((4 * MEMTIER_CHUNK_SIZE) + (MEMTIER_CHUNK_SIZE >> 1))
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#define MEMTIER_HOTPLUG_PRIO 100
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#ifdef CONFIG_NUMA
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#include <linux/types.h>
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extern bool numa_demotion_enabled;
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#else
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#define numa_demotion_enabled false
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#endif /* CONFIG_NUMA */
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#endif /* _LINUX_MEMORY_TIERS_H */
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