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| author | Andrea Arcangeli <aarcange@redhat.com> | 2011-01-25 15:07:25 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-26 10:50:02 +1000 |
| commit | 33a938774fdb9933e9c77504b035f4f87c0859df (patch) | |
| tree | fad15b1b98845672b130c6b5e5fb26dcb2f2aef1 /mm/Kconfig | |
| parent | 8dba474f034c322d96ada39cb20cac711d80dcb2 (diff) | |
| download | lwn-33a938774fdb9933e9c77504b035f4f87c0859df.tar.gz lwn-33a938774fdb9933e9c77504b035f4f87c0859df.zip | |
mm: compaction: don't depend on HUGETLB_PAGE
Commit 5d6892407 ("thp: select CONFIG_COMPACTION if TRANSPARENT_HUGEPAGE
enabled") causes this warning during the configuration process:
warning: (TRANSPARENT_HUGEPAGE) selects COMPACTION which has unmet
direct dependencies (EXPERIMENTAL && HUGETLB_PAGE && MMU)
COMPACTION doesn't depend on HUGETLB_PAGE, it doesn't depend on THP
either, it is also useful for regular alloc_pages(order > 0) including
the very kernel stack during fork (THREAD_ORDER = 1). It's always
better to enable COMPACTION.
The warning should be an error because we would end up with MIGRATION
not selected, and COMPACTION wouldn't work without migration (despite it
seems to build with an inline migrate_pages returning -ENOSYS).
I'd also like to remove EXPERIMENTAL: compaction has been in the kernel
for some releases (for full safety the default remains disabled which I
think is enough).
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reported-by: Luca Tettamanti <kronos.it@gmail.com>
Tested-by: Luca Tettamanti <kronos.it@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index 3ad483bdf505..e9c0c61f2ddd 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -179,7 +179,7 @@ config SPLIT_PTLOCK_CPUS config COMPACTION bool "Allow for memory compaction" select MIGRATION - depends on EXPERIMENTAL && HUGETLB_PAGE && MMU + depends on MMU help Allows the compaction of memory for the allocation of huge pages. |