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mm: implement find_get_pages_range_tag()

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Patch series "Ranged pagevec tagged lookup", v3.

In this series I provide a ranged variant of pagevec_lookup_tag() and
use it in places where it makes sense.  This series removes some common
code and it also has a potential for speeding up some operations
similarly as for pagevec_lookup_range() (but for now I can think of only
artificial cases where this happens).

This patch (of 16):

Implement a variant of find_get_pages_tag() that stops iterating at
given index.  Lots of users of this function (through pagevec_lookup())
actually want a range lookup and all of them are currently open-coding
this.

Also create corresponding pagevec_lookup_range_tag() function.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Jan Kara <[email protected]>
Reviewed-by: Daniel Jordan <[email protected]>
Cc: Bob Peterson <[email protected]>
Cc: Chao Yu <[email protected]>
Cc: David Howells <[email protected]>
Cc: David Sterba <[email protected]>
Cc: Ilya Dryomov <[email protected]>
Cc: Jaegeuk Kim <[email protected]>
Cc: Ryusuke Konishi <[email protected]>
Cc: Steve French <[email protected]>
Cc: "Theodore Ts'o" <[email protected]>
Cc: "Yan, Zheng" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jan Kara 2017-11-15 17:34:33 -08:00 • committed by Linus Torvalds
commit 72b045aecd
4 changed files with 48 additions and 17 deletions
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9
mm/swap.c
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@ -986,14 +986,15 @@ unsigned pagevec_lookup_range(struct pagevec *pvec,
}
EXPORT_SYMBOL(pagevec_lookup_range);
unsigned pagevec_lookup_tag(struct pagevec *pvec, struct address_space *mapping,
pgoff_t *index, int tag, unsigned nr_pages)
unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
struct address_space *mapping, pgoff_t *index, pgoff_t end,
int tag, unsigned nr_pages)
{
pvec->nr = find_get_pages_tag(mapping, index, tag,
pvec->nr = find_get_pages_range_tag(mapping, index, end, tag,
nr_pages, pvec->pages);
return pagevec_count(pvec);
}
EXPORT_SYMBOL(pagevec_lookup_tag);
EXPORT_SYMBOL(pagevec_lookup_range_tag);
/*
* Perform any setup for the swap system