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zsmalloc: partial page ordering within a fullness_list

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We want to see more ZS_FULL pages and less ZS_ALMOST_{FULL, EMPTY}
pages.  Put a page with higher ->inuse count first within its
->fullness_list, which will give us better chances to fill up this page
with new objects (find_get_zspage() return ->fullness_list head for new
object allocation), so some zspages will become ZS_ALMOST_FULL/ZS_FULL
quicker.

It performs a trivial and cheap ->inuse compare which does not slow down
zsmalloc and in the worst case keeps the list pages in no particular
order.

A more expensive solution could sort fullness_list by ->inuse count.

[minchan@kernel.org: code adjustments]
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2015-09-08 15:04:44 -07:00 committed by Linus Torvalds
parent ab9d306d9c
commit 58f1711746
1 changed files with 14 additions and 5 deletions
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19
mm/zsmalloc.c
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@ -643,13 +643,22 @@ static void insert_zspage(struct page *page, struct size_class *class,
if (fullness >= _ZS_NR_FULLNESS_GROUPS)
return;
head = &class->fullness_list[fullness];
if (*head)
list_add_tail(&page->lru, &(*head)->lru);
*head = page;
zs_stat_inc(class, fullness == ZS_ALMOST_EMPTY ?
CLASS_ALMOST_EMPTY : CLASS_ALMOST_FULL, 1);
head = &class->fullness_list[fullness];
if (!*head) {
*head = page;
return;
}
/*
* We want to see more ZS_FULL pages and less almost
* empty/full. Put pages with higher ->inuse first.
*/
list_add_tail(&page->lru, &(*head)->lru);
if (page->inuse >= (*head)->inuse)
*head = page;
}
/*