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Ye LiuandAndrew Morton
7eeed888c9
The last_migrate_reason field uses -1 as a sentinel value to mean "no migration has happened". Replace the four bare -1 occurrences by adding a proper MR_NEVER member to enum migrate_reason, defining a corresponding "never_migrated" string in the MIGRATE_REASON trace macro, and updating the GDB page_owner script to use MR_NEVER instead of the hardcoded -1 so that lx-dump-page-owner does not incorrectly report unmigrated pages as migrated. No functional change. Link: https://lore.kernel.org/20260714015117.78351-3-ye.liu@linux.dev Signed-off-by: Ye Liu <ye.liu@linux.dev> Reviewed-by: Zi Yan <ziy@nvidia.com> Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Cc: Brendan Jackman <jackmanb@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: David Hildenbrand (Arm) <david@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
33 lines
760 B
C
33 lines
760 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef MIGRATE_MODE_H_INCLUDED
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#define MIGRATE_MODE_H_INCLUDED
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/*
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* MIGRATE_ASYNC means never block
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* MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking
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* on most operations but not ->writepage as the potential stall time
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* is too significant
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* MIGRATE_SYNC will block when migrating pages
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*/
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enum migrate_mode {
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MIGRATE_ASYNC,
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MIGRATE_SYNC_LIGHT,
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MIGRATE_SYNC,
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};
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enum migrate_reason {
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MR_COMPACTION,
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MR_MEMORY_FAILURE,
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MR_MEMORY_HOTPLUG,
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MR_SYSCALL, /* also applies to cpusets */
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MR_MEMPOLICY_MBIND,
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MR_NUMA_MISPLACED,
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MR_CONTIG_RANGE,
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MR_LONGTERM_PIN,
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MR_DEMOTION,
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MR_DAMON,
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MR_NEVER, /* page has never been migrated */
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MR_TYPES
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};
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#endif /* MIGRATE_MODE_H_INCLUDED */
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