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/linux/tools/testing/selftests/mm/
H A Dmigration.c3 * The main purpose of the tests here is to exercise the migration entry code
26 FIXTURE(migration) in FIXTURE() argument
35 FIXTURE_SETUP(migration) in FIXTURE_SETUP() argument
60 FIXTURE_TEARDOWN(migration) in FIXTURE_TEARDOWN() argument
87 /* Migration is best effort; try again */ in migrate()
120 * Basic migration entry testing. One thread will move pages back and forth
122 * migration entry wait paths in the kernel.
124 TEST_F_TIMEOUT(migration, private_anon, 2*RUNTIME)
149 TEST_F_TIMEOUT(migration, shared_anon, 2*RUNTIME)
182 * Tests the pmd migration entry paths.
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/linux/tools/testing/selftests/kvm/
H A Drseq_test.c33 * Any bug related to task migration is likely to be timing-dependent; perform
87 * that a migration may have occurred in between rseq and sched in migration_worker()
88 * CPU ID reads. An odd sequence count indicates a migration in migration_worker()
90 * a migration occurred since the count was last read. in migration_worker()
112 * 1. To allow sched_setaffinity() to prompt migration before in migration_worker()
129 * before the next round of migration. The test's check on in migration_worker()
130 * the rseq CPU ID must wait for migration to complete in in migration_worker()
132 * will be missed if the next migration starts before the in migration_worker()
193 "Only one usable CPU, task migration not possible"); in calc_min_max_cpu()
268 * Verify rseq's CPU matches sched's CPU. Ensure migration in main()
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/linux/tools/testing/selftests/kvm/s390/
H A Dcmma_test.c3 * Test for s390x CMMA migration
191 TEST_ASSERT(!r, "enabling migration mode failed r=%d errno=%d", r, errno); in enable_migration_mode()
204 TEST_ASSERT(!r, "getting migration mode status failed r=%d errno=%d", r, errno); in is_migration_mode_on()
243 /* GET_CMMA_BITS without migration mode and without peeking should fail */ in test_get_cmma_basic()
248 /* GET_CMMA_BITS without migration mode and with peeking should work */ in test_get_cmma_basic()
279 /* enabling migration mode on a VM without memory should fail */ in test_migration_mode()
283 TEST_ASSERT(!is_migration_mode_on(vm), "migration mode should still be off"); in test_migration_mode()
300 /* migration mode when memslots have dirty tracking off should fail */ in test_migration_mode()
304 TEST_ASSERT(!is_migration_mode_on(vm), "migration mode should still be off"); in test_migration_mode()
310 /* enabling migration mod in test_migration_mode()
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/linux/Documentation/gpu/rfc/
H A Dgpusvm.rst11 * Rely only on core MM concepts (migration PTEs, page references, and
20 * Partial migration is supported (i.e., a subset of pages attempting to
43 exception is holding a BO's dma-resv lock during the initial migration
47 migration policy requiring GPU access to occur in GPU memory.
89 :doc: Migration
113 * Higher order dma mapping for migration
114 * 4k dma mapping adversely affects migration performance on Intel
117 * Driver side madvise implementation and migration policies
/linux/mm/
H A Dmigrate_device.c3 * Device Memory Migration functionality.
186 * any kind of migration. Side effect is that it "freezes" the in migrate_vma_collect_pmd()
200 * migration as it is only best effort anyway. in migrate_vma_collect_pmd()
202 * If we can lock the folio it's safe to set up a migration entry in migrate_vma_collect_pmd()
204 * single process setting up the migration entry now is an in migrate_vma_collect_pmd()
236 /* Setup special migration page table entry */ in migrate_vma_collect_pmd()
304 * @migrate: migrate struct containing all migration information
336 * folio_migrate_mapping(), except that here we allow migration of a
373 * Unmaps pages for migration. Returns number of source pfns marked as
456 * migrate_vma_unmap() - replace page mapping with special migration pte entry
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H A Dmigrate.c3 * Memory Migration functionality - linux/mm/migrate.c
7 * Page migration was first developed in the context of the memory hotplug
8 * project. The main authors of the migration code are:
86 * If we enable page migration for a page of a certain type by marking in page_movable_ops()
100 * isolate_movable_ops_page - isolate a movable_ops page for migration
104 * Try to isolate a movable_ops page for migration. Will fail if the page is
105 * not a movable_ops page, if the page is already isolated for migration
147 * compaction threads can race against page migration functions in isolate_movable_ops_page()
151 * being (wrongly) re-isolated while it is under migration, in isolate_movable_ops_page()
214 * @mode: The migration mode.
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/linux/drivers/gpu/drm/i915/gem/selftests/
H A Di915_gem_migrate.c137 * Migration will implicitly unbind (asynchronously) any bound in lmem_pages_migrate_one()
144 pr_err("Object failed migration to smem\n"); in lmem_pages_migrate_one()
163 pr_err("Object failed migration to lmem\n"); in lmem_pages_migrate_one()
269 /* Finally sync migration and check content. */ in __igt_lmem_pages_migrate()
360 * This subtest tests that unbinding at migration is indeed performed
362 * that spinner to have terminated. Before each migration we bind a
363 * vma, which should then be async unbound by the migration operation.
368 * Note that each async bind operation is awaiting the previous migration
369 * due to the moving fence resulting from the migration.
443 * arming the migration error check and block async migration. This
/linux/include/linux/
H A Dmigrate.h16 * struct movable_operations - Driver page migration
30 * If page migration is successful, the driver should return 0.
32 * -EAGAIN. The VM interprets this as a temporary migration failure and
33 * will retry it later. Any other error value is a permanent migration
34 * failure and migration will not be retried.
39 * If migration fails on the isolated page, the VM informs the driver
40 * that the page is no longer a candidate for migration by calling
H A Dvfio.h204 * struct vfio_migration_ops - VFIO bus device driver migration callbacks
206 * @migration_set_state: Optional callback to change the migration state for
207 * devices that support migration. It's mandatory for
208 * VFIO_DEVICE_FEATURE_MIGRATION migration support.
211 * of stream or error whenever the migration FSM leaves a data transfer
213 * @migration_get_state: Optional callback to get the migration state for
214 * devices that support migration. It's mandatory for
215 * VFIO_DEVICE_FEATURE_MIGRATION migration support.
218 * VFIO_DEVICE_FEATURE_MIGRATION migration support.
/linux/Documentation/networking/
H A Dnet_failover.rst24 datapath. It also enables hypervisor controlled live migration of a VM with
65 be brought UP during live migration to allow uninterrupted communication.
113 Live Migration of a VM with SR-IOV VF & virtio-net in STANDBY mode
116 net_failover also enables hypervisor controlled live migration to be supported
120 Here is a sample script that shows the steps to initiate live migration from
165 # Clean up FDB entries after migration completes.
169 On the destination hypervisor, a shared bridge 'br0' is created before migration
173 The following script is executed on the destination hypervisor once migration
/linux/Documentation/arch/powerpc/
H A Dvpa-dtl.rst149 …migration/9 67 [009] 105373.359903: sched:sched_waking: comm=perf pid=134…
150 …migration/9 67 [009] 105373.359904: sched:sched_migrate_task: comm=perf pid=134…
151 …migration/9 67 [009] 105373.359907: sched:sched_stat_runtime: comm=migration/9 …
152 …migration/9 67 [009] 105373.359908: sched:sched_switch: prev_comm=migrati…
156 …13418 [010] 105373.360052: sched:sched_waking: comm=migration/10 pid=72 prio=0…
/linux/Documentation/admin-guide/cgroup-v1/
H A Dmemcg_test.rst102 The logic is very clear. (About migration, see below)
129 7. Page Migration
162 9.3 Migration
165 For NUMA, migration is an another special case. To do easy test, cpuset
166 is useful. Following is a sample script to do migration::
179 In above set, when you moves a task from 01 to 02, page migration to
211 This is an easy way to test page migration, too.
298 9.9 Move charges at task migration
301 Charges associated with a task can be moved along with task migration.
/linux/Documentation/admin-guide/mm/
H A Duserfaultfd.rst295 the VM to another physical machine. Since we want the migration to be
304 migration. Postcopy live migration is one form of memory
309 migration to QEMU.
317 It is generally beneficial to run one pass of precopy live migration
318 just before starting postcopy live migration, in order to avoid
321 The implementation of postcopy live migration currently uses one
327 in the destination node, into the socket, and the migration thread of
337 by the parallel QEMU migration thread).
345 migration thread in the QEMU running in the destination node will
353 migration around and a single per-page bitmap has to be maintained in
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/linux/kernel/cgroup/
H A Dcgroup-internal.h108 /* used to track tasks and csets during migration */
123 * Before migration is committed, the target migration tasks are on
126 * or ->dst_csets depending on whether migration is committed.
136 /* migration context also tracks preloading */
140 * atomic success or failure on actual migration.
148 /* subsystems affected by migration */
/linux/arch/powerpc/platforms/pseries/
H A Dvas.c433 * The migration SUSPEND thread sets migration_in_progress and in vas_allocate_window()
438 * initiates the migration. in vas_allocate_window()
533 * lost the credit or with migration. So just remove the entry in vas_deallocate_window()
677 * For partition migration, reopen all windows that are closed in reconfig_open_windows()
691 * Open windows if they are closed only with migration or in reconfig_open_windows()
701 * This window is closed with DLPAR and migration events. in reconfig_open_windows()
704 * migration notifier. So the user space can issue DLPAR in reconfig_open_windows()
705 * CPU hotplug while migration in progress. In this case in reconfig_open_windows()
777 * or for migration before. Go for next window. in reconfig_close_windows()
778 * For migration, nothing to do since this window in reconfig_close_windows()
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H A Dmobility.c3 * Support for Partition Mobility/Migration
106 * represented by the node is never interrupted by the migration. in delete_dt_node()
470 * If the memory transfer is already complete and the migration in wait_for_vasi_session_completed()
740 * When the migration is initiated, the hypervisor changes VAS in pseries_migrate_partition()
744 * faults from the migration event. So reduce this time window in pseries_migrate_partition()
804 * Used by drmgr to determine the kernel behavior of the migration interface.
806 * Version 1: Performs all PAPR requirements for migration including
811 static CLASS_ATTR_WO(migration);
824 pr_err("unable to create migration sysfs file (%d)\n", rc); in mobility_sysfs_init()
/linux/kernel/time/
H A Dtimer_migration.h22 * struct tmigr_group - timer migration hierarchy group
76 * struct tmigr_cpu - timer migration per CPU group
84 * idle before the timer migration hierarchy hotplug AP is
87 * @idle: Indicates whether the CPU is idle in the timer migration
92 * @wakeup: Stores the first timer when the timer migration
/linux/Documentation/ABI/testing/
H A Dsysfs-kernel-mm-numa11 Page migration during reclaim is intended for systems
16 Allowing page migration during reclaim enables these
18 when the fast tier is under pressure. This migration
/linux/drivers/vfio/pci/pds/
H A Dcmds.c192 dev_dbg(dev, "vf%u: Get migration status\n", pds_vfio->vf_id); in pds_vfio_get_lm_state_size_cmd()
295 dev_dbg(&pdev->dev, "vf%u: Get migration state\n", pds_vfio->vf_id); in pds_vfio_get_lm_state_cmd()
301 dev_err(&pdev->dev, "failed to map save migration file: %pe\n", in pds_vfio_get_lm_state_cmd()
311 dev_err(&pdev->dev, "failed to get migration state: %pe\n", in pds_vfio_get_lm_state_cmd()
333 dev_dbg(&pdev->dev, "vf%u: Set migration state\n", pds_vfio->vf_id); in pds_vfio_set_lm_state_cmd()
340 "failed to map restore migration file: %pe\n", in pds_vfio_set_lm_state_cmd()
350 dev_err(&pdev->dev, "failed to set migration state: %pe\n", in pds_vfio_set_lm_state_cmd()
376 dev_warn(dev, "Invalid host VF migration status, %d\n", in pds_vfio_send_host_vf_lm_status_cmd()
383 dev_warn(dev, "failed to send host VF migration status: %pe\n", in pds_vfio_send_host_vf_lm_status_cmd()
H A Dpci_drv.c25 * Documentation states that the kernel migration driver must not in pds_vfio_recovery()
31 * 1. Migration is in progress, which will cause the next step of in pds_vfio_recovery()
32 * the migration to fail. in pds_vfio_recovery()
62 * error and may cause migration to fail. in pds_vfio_pci_notify_handler()
/linux/include/uapi/linux/
H A Dvfio.h1010 * Indicates the device can support the migration API through
1040 * Upon VFIO_DEVICE_FEATURE_SET, execute a migration state change on the VFIO
1044 * The kernel migration driver must fully transition the device to the new state
1047 * The kernel migration driver must not generate asynchronous device state
1059 * this FD when it is finished. The user must consider the migration data stream
1064 * Upon VFIO_DEVICE_FEATURE_GET, get the current migration state of the VFIO
1074 * The device migration Finite State Machine is described by the enum
1075 * vfio_device_mig_state. Some of the FSM arcs will create a migration data
1076 * transfer session by returning a FD, in this case the migration data will
1102 * migration driver must accept and respond to interaction to support external
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/linux/Documentation/virt/kvm/devices/
H A Dvm.rst291 Allows userspace to stop migration mode, needed for PGSTE migration.
292 Setting this attribute when migration mode is not active will have no
301 Allows userspace to start migration mode, needed for PGSTE migration.
302 Setting this attribute when migration mode is already active will have
306 dirty tracking is disabled on any memslot, migration mode is automatically
310 :Returns: -ENOMEM if there is not enough free memory to start migration mode;
317 Allows userspace to query the status of migration mode.
320 the data itself is either 0 if migration mode is disabled or 1
/linux/fs/ocfs2/dlm/
H A Ddlmmaster.c822 /* if there is a migration in progress, let the migration in dlm_get_lock_resource()
824 * of the MIGRATION mle: either the migrate finished or in dlm_get_lock_resource()
836 mig ? "MIGRATION" : "BLOCK"); in dlm_get_lock_resource()
1582 mlog(0, "migration mle was found (%u->%u)\n", in dlm_master_request_handler()
1815 " from %u for migration\n", in dlm_assert_master_handler()
1820 " from %u for migration, ignoring\n", in dlm_assert_master_handler()
1920 mlog(0, "finishing off migration of lockres %.*s, " in dlm_assert_master_handler()
1966 * ref given by the master / migration request message. in dlm_assert_master_handler()
2108 * prevent migration from starting while we're still asserting in dlm_assert_master_worker()
2109 * our dominance. The reserved ast delays migration. in dlm_assert_master_worker()
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/linux/tools/perf/scripts/python/bin/
H A Dsched-migration-report2 # description: sched migration overview
3 perf script $@ -s "$PERF_EXEC_PATH"/scripts/python/sched-migration.py
/linux/drivers/vfio/pci/hisilicon/
H A Dhisi_acc_vfio_pci.h121 /* For migration state */
139 * It holds migration data corresponding to the last migration

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