diff options
author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-08-15 03:30:23 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-15 05:56:56 +0300 |
commit | 1378a5ee451a5e87d0d8dd6356a0b7844db231f6 (patch) | |
tree | 557c87581ebd5347545d5bf86c5b6711f846b341 /drivers/nvdimm | |
parent | 14a36a435343931296277f4a3c5adf4e29a8f46d (diff) | |
download | linux-1378a5ee451a5e87d0d8dd6356a0b7844db231f6.tar.xz |
mm: store compound_nr as well as compound_order
Patch series "THP prep patches".
These are some generic cleanups and improvements, which I would like
merged into mmotm soon. The first one should be a performance improvement
for all users of compound pages, and the others are aimed at getting code
to compile away when CONFIG_TRANSPARENT_HUGEPAGE is disabled (ie small
systems). Also better documented / less confusing than the current prefix
mixture of compound, hpage and thp.
This patch (of 7):
This removes a few instructions from functions which need to know how many
pages are in a compound page. The storage used is either page->mapping on
64-bit or page->index on 32-bit. Both of these are fine to overlay on
tail pages.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Link: http://lkml.kernel.org/r/20200629151959.15779-1-willy@infradead.org
Link: http://lkml.kernel.org/r/20200629151959.15779-2-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/nvdimm')
0 files changed, 0 insertions, 0 deletions