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mm/rmap: use page_not_mapped in try_to_unmap() 

[ Upstream commit b7e188ec98b1644ff70a6d3624ea16aadc39f5e0 ]

page_mapcount_is_zero() calculates accurately how many mappings a hugepage
has in order to check against 0 only.  This is a waste of cpu time.  We
can do this via page_not_mapped() to save some possible atomic_read
cycles.  Remove the function page_mapcount_is_zero() as it's not used
anymore and move page_not_mapped() above try_to_unmap() to avoid
identifier undeclared compilation error.

Link: https://lkml.kernel.org/r/20210130084904.35307-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miaohe Lin 2021-02-25 17:18:03 -08:00 committed by Sasha Levin
parent 432b61863a
commit 68ce37ebe0
1 changed files with 3 additions and 8 deletions
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11
mm/rmap.c
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@ -1690,9 +1690,9 @@ static bool invalid_migration_vma(struct vm_area_struct *vma, void *arg)
return is_vma_temporary_stack(vma);
}
static int page_mapcount_is_zero(struct page *page)
static int page_not_mapped(struct page *page)
{
return !total_mapcount(page);
return !page_mapped(page);
}
/**
@ -1710,7 +1710,7 @@ bool try_to_unmap(struct page *page, enum ttu_flags flags)
struct rmap_walk_control rwc = {
.rmap_one = try_to_unmap_one,
.arg = (void *)flags,
.done = page_mapcount_is_zero,
.done = page_not_mapped,
.anon_lock = page_lock_anon_vma_read,
};
@ -1734,11 +1734,6 @@ bool try_to_unmap(struct page *page, enum ttu_flags flags)
return !page_mapcount(page) ? true : false;
}
static int page_not_mapped(struct page *page)
{
return !page_mapped(page);
}
/**
* try_to_munlock - try to munlock a page
* @page: the page to be munlocked