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| author | Stephen Rothwell <sfr@canb.auug.org.au> | 2018-01-11 16:16:10 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2018-01-11 16:16:12 +1100 |
| commit | e130bc1d00a4a8597f18c31f2e75cd77a09fb7b1 (patch) | |
| tree | c34476e5afc3d29e9b38373de097faa9597753b8 /Documentation/sysctl | |
| parent | e2d7fe89e8ae9ee56c560095b4fe8042c3e347cd (diff) | |
| parent | 70286688e5ad172ebd9cd1fd468fd54361619479 (diff) | |
Merge branch 'akpm-current/current'
Diffstat (limited to 'Documentation/sysctl')
| -rw-r--r-- | Documentation/sysctl/vm.txt | 30 |
1 files changed, 2 insertions, 28 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 5025ff9307e6..17256f2ad919 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -30,7 +30,6 @@ Currently, these files are in /proc/sys/vm: - dirty_writeback_centisecs - drop_caches - extfrag_threshold -- hugepages_treat_as_movable - hugetlb_shm_group - laptop_mode - legacy_va_layout @@ -261,30 +260,6 @@ any throttling. ============================================================== -hugepages_treat_as_movable - -This parameter controls whether we can allocate hugepages from ZONE_MOVABLE -or not. If set to non-zero, hugepages can be allocated from ZONE_MOVABLE. -ZONE_MOVABLE is created when kernel boot parameter kernelcore= is specified, -so this parameter has no effect if used without kernelcore=. - -Hugepage migration is now available in some situations which depend on the -architecture and/or the hugepage size. If a hugepage supports migration, -allocation from ZONE_MOVABLE is always enabled for the hugepage regardless -of the value of this parameter. -IOW, this parameter affects only non-migratable hugepages. - -Assuming that hugepages are not migratable in your system, one usecase of -this parameter is that users can make hugepage pool more extensible by -enabling the allocation from ZONE_MOVABLE. This is because on ZONE_MOVABLE -page reclaim/migration/compaction work more and you can get contiguous -memory more likely. Note that using ZONE_MOVABLE for non-migratable -hugepages can do harm to other features like memory hotremove (because -memory hotremove expects that memory blocks on ZONE_MOVABLE are always -removable,) so it's a trade-off responsible for the users. - -============================================================== - hugetlb_shm_group hugetlb_shm_group contains group id that is allowed to create SysV @@ -337,8 +312,6 @@ The lowmem_reserve_ratio is an array. You can see them by reading this file. % cat /proc/sys/vm/lowmem_reserve_ratio 256 256 32 - -Note: # of this elements is one fewer than number of zones. Because the highest - zone's value is not necessary for following calculation. But, these values are not used directly. The kernel calculates # of protection pages for each zones from them. These are shown as array of protection pages @@ -389,7 +362,8 @@ As above expression, they are reciprocal number of ratio. pages of higher zones on the node. If you would like to protect more pages, smaller values are effective. -The minimum value is 1 (1/1 -> 100%). +The minimum value is 1 (1/1 -> 100%). The value less than 1 completely +disables protection of the pages. ============================================================== |