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/linux/lib/
H A Dcpu_rmap.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * cpu_rmap.c: CPU affinity reverse-map support
13 * objects with CPU affinities. This can be seen as a reverse-map of
14 * CPU affinity. However, we do not assume that the object affinities
21 * alloc_cpu_rmap - allocate CPU affinity reverse-map
39 rmap = kzalloc(obj_offset + size * sizeof(rmap->obj[0]), flags); in alloc_cpu_rmap()
43 kref_init(&rmap->refcount); in alloc_cpu_rmap()
44 rmap->obj = (void **)((char *)rmap + obj_offset); in alloc_cpu_rmap()
50 * any newly-hotplugged CPUs to have some object assigned. in alloc_cpu_rmap()
53 rmap->near[cpu].index = cpu % size; in alloc_cpu_rmap()
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/linux/Documentation/driver-api/cxl/platform/acpi/
H A Dsrat.rst1 .. SPDX-License-Identifier: GPL-2.0
4 SRAT - Static Resource Affinity Table
7 The System/Static Resource Affinity Table describes resource (CPU, Memory)
8 affinity to "Proximity Domains". This table is technically optional, but for
13 created. If things don't look quite the way you expect - check the SRAT Memory
14 Affinity entries and CEDT CFMWS to determine what your platform actually
23 A proximity domain is ROUGHLY equivalent to "NUMA Node" - though a 1-to-1
27 Memory Affinity
30 programming in BIOS - an SRAT entry for that memory needs to be present.
34 Subtable Type : 01 [Memory Affinity]
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/linux/tools/virtio/ringtest/
H A Drun-on-all.sh2 # SPDX-License-Identifier: GPL-2.0
4 CPUS_ONLINE=$(lscpu --online -p=cpu|grep -v -e '#')
8 HOST_AFFINITY=$(echo "${CPUS_ONLINE}"|tail -n 1)
16 (echo "$@" | grep -e "--sleep" > /dev/null) || \
19 echo "GUEST AFFINITY $cpu"
20 "$@" --host-affinity $HOST_AFFINITY --guest-affinity $cpu
23 echo "NO GUEST AFFINITY"
24 "$@" --host-affinity $HOST_AFFINITY
25 echo "NO AFFINITY"
/linux/drivers/infiniband/hw/hfi1/
H A Daffinity.h1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
3 * Copyright(c) 2015 - 2020 Intel Corporation.
35 /* Initialize non-HT cpu cores mask */
37 /* Initialize driver affinity data */
40 * Set IRQ affinity to a CPU. The function will determine the
41 * CPU and set the affinity to it.
46 * Remove the IRQ's CPU affinity. This function also updates
52 * Determine a CPU affinity for a user process, if the process does not
53 * have an affinity set yet.
77 struct mutex lock; /* protects affinity nodes */
H A Daffinity.c1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
3 * Copyright(c) 2015 - 2020 Intel Corporation.
12 #include "affinity.h"
35 cpumask_clear(&set->mask); in init_cpu_mask_set()
36 cpumask_clear(&set->used); in init_cpu_mask_set()
37 set->gen = 0; in init_cpu_mask_set()
43 if (cpumask_equal(&set->mask, &set->used)) { in _cpu_mask_set_gen_inc()
48 set->gen++; in _cpu_mask_set_gen_inc()
49 cpumask_clear(&set->used); in _cpu_mask_set_gen_inc()
55 if (cpumask_empty(&set->used) && set->gen) { in _cpu_mask_set_gen_dec()
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/linux/tools/perf/util/
H A Daffinity.c1 // SPDX-License-Identifier: GPL-2.0
2 /* Manage affinity to optimize IPIs inside the kernel perf API. */
11 #include "affinity.h"
15 int sz = cpu__max_cpu().cpu + 8 - 1; in get_cpu_set_size()
25 int affinity__setup(struct affinity *a) in affinity__setup()
29 a->orig_cpus = bitmap_zalloc(cpu_set_size * 8); in affinity__setup()
30 if (!a->orig_cpus) in affinity__setup()
31 return - in affinity__setup()
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H A Daffinity.h1 // SPDX-License-Identifier: GPL-2.0
8 struct affinity { struct
14 void affinity__cleanup(struct affinity *a); argument
15 void affinity__set(struct affinity *a, int cpu);
16 int affinity__setup(struct affinity *a);
H A Devlist.h1 /* SPDX-License-Identifier: GPL-2.0 */
20 #include "affinity.h"
38 * NOTREADY --(0)--> RUNNING --(
367 struct affinity *affinity; global() member
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H A Dmmap.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2011-2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
5 * Parts came from evlist.c builtin-{top,stat,record}.c, see those files for further
35 len = bitmap_scnprintf(mask->bits, mask->nbits, buf, MASK_SIZE); in mmap_cpu_mask__scnprintf()
37 pr_debug("%p: %s mask[%zd]: %s\n", mask, tag, mask->nbits, buf); in mmap_cpu_mask__scnprintf()
42 return perf_mmap__mmap_len(&map->cor in mmap__mmap_len()
98 perf_mmap__aio_bind(struct mmap * map,int idx,struct perf_cpu cpu,int affinity) perf_mmap__aio_bind() argument
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/linux/tools/testing/selftests/rseq/
H A Dbasic_test.c1 // SPDX-License-Identifier: LGPL-2.1
18 cpu_set_t affinity, test_affinity; in test_cpu_pointer() local
21 sched_getaffinity(0, sizeof(affinity), &affinity); in test_cpu_pointer()
24 if (CPU_ISSET(i, &affinity)) { in test_cpu_pointer()
39 sched_setaffinity(0, sizeof(affinity), &affinity); in test_cpu_pointer()
59 return -1; in main()
H A Dslice_test.c1 // SPDX-License-Identifier: LGPL-2.1
97 int64_t delta = now->tv_sec - start->tv_sec; in elapsed()
100 delta += now->tv_nsec - start->tv_nsec; in elapsed()
108 while (RSEQ_READ_ONCE(p->run)) { in noise_thread()
114 } while (!elapsed(&ts_start, &ts_now, p->noise_nsecs)); in noise_thread()
117 ts_start.tv_nsec = p->sleep_nsecs; in noise_thread()
125 cpu_set_t affinity; in FIXTURE_SETUP() local
134 ASSERT_EQ(sched_getaffinity(0, sizeof(affinity), &affinity), 0); in FIXTURE_SETUP()
138 if (!CPU_ISSET(i, &affinity)) in FIXTURE_SETUP()
141 CPU_ZERO(&affinity); in FIXTURE_SETUP()
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/linux/tools/power/cpupower/bench/
H A Dsystem.c1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* cpufreq-bench CPUFreq microbenchmark
43 * @retval -1 when failed
54 return -1; in set_cpufreq_governor()
60 return -1; in set_cpufreq_governor()
67 * sets cpu affinity for the process
69 * @param cpu cpu# to which the affinity should be set
72 * @retval -1 when setting the affinity failed
82 dprintf("set affinity to cpu #%u\n", cpu); in set_cpu_affinity()
86 fprintf(stderr, "warning: unable to set cpu affinity\n"); in set_cpu_affinity()
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/linux/include/linux/
H A Dcpu_rmap.h1 /* SPDX-License-Identifier: GPL-2.0-only */
6 * cpu_rmap.c: CPU affinity reverse-map support
16 * struct cpu_rmap - CPU affinity reverse-map
18 * @size: Number of objects to be reverse-mapped
21 * based on affinity masks
40 const struct cpumask *affinity);
44 return rmap->near[cpu].index; in cpu_rmap_lookup_index()
49 return rmap->obj[rmap->near[cpu].index]; in cpu_rmap_lookup_obj()
53 * alloc_irq_cpu_rmap - allocate CPU affinity reverse-map for IRQs
/linux/Documentation/core-api/
H A Dworkqueue.rst33 thread system-wide. A single MT wq needed to keep around the same
60 * Use per-CPU unified worker pools shared by all wq to provide
85 worker-pools.
87 The cmwq design differentiates between the user-facing workqueues that
89 which manages worker-pools and processes the queued work items.
91 There are two worker-pools, one for normal work items and the other
93 worker-pools to serve work items queued on unbound workqueues - the
98 Each per-CPU BH worker pool contains only one pseudo worker which represents
110 When a work item is queued to a workqueue, the target worker-pool is
112 and appended on the shared worklist of the worker-pool. For example,
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/linux/kernel/irq/
H A Dmanage.c1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
4 * Copyright (C) 2005-2006 Thomas Gleixner
42 irq_work_sync(&desc->redirect.work); in synchronize_irqwork()
60 while (irqd_irq_inprogress(&desc->irq_data)) in __synchronize_hardirq()
63 /* Ok, that indicated we're done: double-check carefully. */ in __synchronize_hardirq()
64 guard(raw_spinlock_irqsave)(&desc->lock); in __synchronize_hardirq()
65 inprogress = irqd_irq_inprogress(&desc->irq_data); in __synchronize_hardirq()
85 * synchronize_hardirq - wait for pending hard IRQ handlers (on other CPUs)
98 * This function may be called - with care - from IRQ context.
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H A Dirq_test.c1 // SPDX-License-Identifier: LGPL-2.1+
49 virq = irq_domain_alloc_descs(-1, 1, 0, NUMA_NO_NODE, affd); in irq_test_setup_fake_irq()
76 KUNIT_EXPECT_EQ(test, desc->depth, 0); in irq_disable_depth_test()
79 KUNIT_EXPECT_EQ(test, desc->depth, 1); in irq_disable_depth_test()
82 KUNIT_EXPECT_EQ(test, desc->depth, 0); in irq_disable_depth_test()
100 KUNIT_EXPECT_EQ(test, desc->depth, 0); in irq_free_disabled_test()
103 KUNIT_EXPECT_EQ(test, desc->depth, 1); in irq_free_disabled_test()
106 KUNIT_EXPECT_GE(test, desc->depth, 1); in irq_free_disabled_test()
110 KUNIT_EXPECT_EQ(test, desc->depth, 0); in irq_free_disabled_test()
120 struct irq_affinity_desc affinity = { in irq_shutdown_depth_test() local
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/linux/tools/testing/selftests/cgroup/
H A Dtest_cpuset.c1 // SPDX-License-Identifier: GPL-2.0
53 if (cg_write(parent, "cgroup.subtree_control", "-cpuset")) in do_controller_fn()
113 /* Enable permissions along src->dst tree path */ in test_cpuset_perms_object()
114 if (chown(child_src_procs, test_euid, -1) || in test_cpuset_perms_object()
115 chown(child_dst_procs, test_euid, -1)) in test_cpuset_perms_object()
118 if (allow && chown(parent_procs, test_euid, -1)) in test_cpuset_perms_object()
203 if (chown(parent_procs, test_euid, -1) || in test_cpuset_perms_subtree()
204 chown(parent_subctl, test_euid, -1) || in test_cpuset_perms_subtree()
205 chown(child_procs, test_euid, -1)) in test_cpuset_perms_subtree()
212 * internal-node constraing violation. in test_cpuset_perms_subtree()
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/linux/drivers/md/
H A Ddm-ps-io-affinity.c1 // SPDX-License-Identifier: GPL-2.0-only
7 #include "dm-path-selector.h"
9 #include <linux/device-mapper.h>
12 #define DM_MSG_PREFIX "multipath io-affinity"
29 struct path_info *pi = s->path_map[cpu]; in ioa_free_path()
34 if (refcount_dec_and_test(&pi->refcount)) { in ioa_free_path()
35 cpumask_clear_cpu(cpu, s->path_mask); in ioa_free_path()
36 free_cpumask_var(pi->cpumask); in ioa_free_path()
39 s->path_map[cpu] = NULL; in ioa_free_path()
46 struct selector *s = ps->context; in ioa_add_path()
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/linux/Documentation/devicetree/bindings/interrupt-controller/
H A Dapple,aic.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/interrupt-controller/apple,aic.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Hector Martin <marcan@marcan.st>
19 - Level-triggered hardware IRQs wired to SoC blocks
20 - Single mask bit per IRQ
21 - Per-IRQ affinity setting
22 - Automatic masking on event delivery (auto-ack)
23 - Software triggering (ORed with hw line)
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/linux/Documentation/driver-api/cxl/platform/example-configurations/
H A Dflexible.rst1 .. SPDX-License-Identifier: GPL-2.0
15 * Cross-Bridge interleave is described in one CFMWS that covers all capacity.
16 * One CFMWS is also described per-host bridge.
17 * One CFMWS is also described per-device.
142 Subtable Type : 01 [Memory Affinity]
152 Non-Volatile : 0
154 Subtable Type : 01 [Memory Affinity]
164 Non-Volatile : 0
166 Subtable Type : 01 [Memory Affinity]
176 Non-Volatile : 0
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/linux/drivers/gpu/drm/amd/amdkfd/
H A Dkfd_crat.h1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
3 * Copyright 2014-2022 Advanced Micro Devices, Inc.
87 * ComputeUnit Affinity structure and definitions
122 * HSA Memory Affinity structure and definitions
143 uint8_t reserved2[CRAT_MEMORY_RESERVED_LENGTH - 1];
147 * HSA Cache Affinity structure and definitions
176 * HSA TLB Affinity structure and definitions
211 * HSA CCompute/APU Affinity structure and definitions
230 * HSA IO Link Affinity structure and definitions
279 uint8_t reserved2[CRAT_IOLINK_RESERVED_LENGTH - 1];
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/linux/kernel/
H A Dkthread.c1 // SPDX-License-Identifier: GPL-2.0-only
84 WARN_ON(!(k->flags & PF_KTHREAD)); in to_kthread()
85 return k->worker_private; in to_kthread()
92 if (!kthread || !kthread->full_name) { in get_kthread_comm()
93 strscpy(buf, tsk->comm, buf_size); in get_kthread_comm()
97 strscpy_pad(buf, kthread->full_name, buf_size); in get_kthread_comm()
111 init_completion(&kthread->exited); in set_kthread_struct()
112 init_completion(&kthread->parked); in set_kthread_struct()
113 INIT_LIST_HEAD(&kthread->affinity_node); in set_kthread_struct()
114 p->vfork_done = &kthread->exited; in set_kthread_struct()
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/linux/tools/testing/selftests/bpf/
H A Dbench.c1 // SPDX-License-Identifier: GPL-2.0
19 .affinity = false,
41 long total = res->false_hits + res->hits + res->drops; in false_hits_report_progress()
44 iter, (delta_ns - 1000000000) / 1000.0); in false_hits_report_progress()
47 res->false_hits, total, ((float)res->false_hits / total) * 100); in false_hits_report_progress()
73 hits_per_sec = res->hits / 1000000.0 / (delta_ns / 1000000000.0); in hits_drops_report_progress()
75 drops_per_sec = res->drops / 1000000.0 / (delta_ns / 1000000000.0); in hits_drops_report_progress()
78 iter, (delta_ns - 1000000000) / 1000.0); in hits_drops_report_progress()
92 gp_stat->mean += res[i].gp_ns / 1000.0 / (double)res[i].gp_ct / (0.0 + res_cnt); in grace_period_latency_basic_stats()
94 #define IT_MEAN_DIFF (res[i].gp_ns / 1000.0 / (double)res[i].gp_ct - gp_stat->mean) in grace_period_latency_basic_stats()
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/linux/Documentation/translations/zh_CN/core-api/irq/
H A Dirq-affinity.rst1 .. include:: ../../disclaimer-zh_CN.rst
3 :Original: Documentation/core-api/irq/irq-affinity.rst
9 .. _cn_irq-affinity.rst:
16 - 作者：最初由Ingo Molnar <mingo@redhat.com>开始撰写
17 - 后期更新维护： Max Krasnyansky <maxk@qualcomm.com>
23 (IRQ affinity)，那么所有cpu的默认值将保持不变(即关联到所有CPU).
28 下面是一个先将IRQ44(eth1)限制在CPU0-3上，然后限制在CPU4-7上的例子(这是一个8CPU的SMP box)
39 [root@moon 44]# ping -f h
42 --- hell ping statistics ---
44 round-trip min/avg/max = 0.1/0.1/0.4 ms
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/linux/arch/arm64/kernel/
H A Dsleep.S1 /* SPDX-License-Identifier: GPL-2.0 */
4 #include <asm/asm-offsets.h>
14 * @rs0: register containing affinity level 0 bit shift
15 * @rs1: register containing affinity level 1 bit shift
16 * @rs2: register containing affinity level 2 bit shift
17 * @rs3: register containing affinity level 3 bit shift
21 * Pseudo C-code:
58 * link-register is saved and restored, it will appear to return from this
60 * __cpu_suspend_enter() will always return a non-zero value, whereas the
93 stp x29, lr, [sp, #-16]!
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