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| author | Vlastimil Babka <vbabka@suse.cz> | 2020-04-01 21:11:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-02 09:35:32 -0700 |
| commit | d4af73e3f8d09b0417ba45082f289fc38bd3a970 (patch) | |
| tree | c1ba8b2140e7c8473c0390eb1ce76bc1a74177b4 /mm/hugetlb.c | |
| parent | 353b2de42e84a8c47be6326e935c58135843eac8 (diff) | |
| download | lwn-d4af73e3f8d09b0417ba45082f289fc38bd3a970.tar.gz lwn-d4af73e3f8d09b0417ba45082f289fc38bd3a970.zip | |
mm/hugetlb: remove unnecessary memory fetch in PageHeadHuge()
Commit f1e61557f023 ("mm: pack compound_dtor and compound_order into one
word in struct page") changed compound_dtor from a pointer to an array
index in order to pack it. To check if page has the hugeltbfs
compound_dtor, we can just compare the index directly without fetching the
function pointer. Said commit did that with PageHuge() and we can do the
same with PageHeadHuge() to make the code a bit smaller and faster.
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Neha Agarwal <nehaagarwal@google.com>
Link: http://lkml.kernel.org/r/20200311172440.6988-1-vbabka@suse.cz
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 4b84640fedf4..f9ea1e5197b4 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1528,7 +1528,7 @@ int PageHeadHuge(struct page *page_head) if (!PageHead(page_head)) return 0; - return get_compound_page_dtor(page_head) == free_huge_page; + return page_head[1].compound_dtor == HUGETLB_PAGE_DTOR; } /* |