forked from mirrors/linux
8eb42beac8
In order to remove the need to manually keep three different files in synch, provide a common definition of the mapping between enum migrate_reason, and the associated strings for each enum item. 1. Use the tracing system's mapping of enums to strings, by redefining and reusing the MIGRATE_REASON and supporting macros, and using that to populate the string array in mm/debug.c. 2. Move enum migrate_reason to migrate_mode.h. This is not strictly necessary for this patch, but migrate mode and migrate reason go together, so this will slightly clarify things. Link: https://lkml.kernel.org/r/20210922041755.141817-2-jhubbard@nvidia.com Signed-off-by: John Hubbard <jhubbard@nvidia.com> Reviewed-by: Weizhao Ouyang <o451686892@gmail.com> Cc: "Huang, Ying" <ying.huang@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
35 lines
985 B
C
35 lines
985 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef MIGRATE_MODE_H_INCLUDED
|
|
#define MIGRATE_MODE_H_INCLUDED
|
|
/*
|
|
* MIGRATE_ASYNC means never block
|
|
* MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking
|
|
* on most operations but not ->writepage as the potential stall time
|
|
* is too significant
|
|
* MIGRATE_SYNC will block when migrating pages
|
|
* MIGRATE_SYNC_NO_COPY will block when migrating pages but will not copy pages
|
|
* with the CPU. Instead, page copy happens outside the migratepage()
|
|
* callback and is likely using a DMA engine. See migrate_vma() and HMM
|
|
* (mm/hmm.c) for users of this mode.
|
|
*/
|
|
enum migrate_mode {
|
|
MIGRATE_ASYNC,
|
|
MIGRATE_SYNC_LIGHT,
|
|
MIGRATE_SYNC,
|
|
MIGRATE_SYNC_NO_COPY,
|
|
};
|
|
|
|
enum migrate_reason {
|
|
MR_COMPACTION,
|
|
MR_MEMORY_FAILURE,
|
|
MR_MEMORY_HOTPLUG,
|
|
MR_SYSCALL, /* also applies to cpusets */
|
|
MR_MEMPOLICY_MBIND,
|
|
MR_NUMA_MISPLACED,
|
|
MR_CONTIG_RANGE,
|
|
MR_LONGTERM_PIN,
|
|
MR_DEMOTION,
|
|
MR_TYPES
|
|
};
|
|
|
|
#endif /* MIGRATE_MODE_H_INCLUDED */
|