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| author |   Yang Shi <shy828301@gmail.com> | 2021-06-30 18:51:55 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-30 20:47:30 -0700 |
| commit | e346e6688c4aa18588f2c6a75b572d8ca7a65f5f (patch) | |
| tree | ef14cbbba035dcc92627157359af7816fa37aa0d /arch | |
| parent | mm: migrate: check mapcount for THP instead of refcount (diff) | |
| download | linux-dev-e346e6688c4aa18588f2c6a75b572d8ca7a65f5f.tar.xz linux-dev-e346e6688c4aa18588f2c6a75b572d8ca7a65f5f.zip | |
mm: thp: skip make PMD PROT_NONE if THP migration is not supported
A quick grep shows x86_64, PowerPC (book3s), ARM64 and S390 support both
NUMA balancing and THP. But S390 doesn't support THP migration so NUMA
balancing actually can't migrate any misplaced pages.
Skip make PMD PROT_NONE for such case otherwise CPU cycles may be wasted
by pointless NUMA hinting faults on S390.
Link: https://lkml.kernel.org/r/20210518200801.7413-8-shy828301@gmail.com
Signed-off-by: Yang Shi <shy828301@gmail.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions