From d3d07c92ff69f784bb8c3279fa87678bfa2f7f6f Mon Sep 17 00:00:00 2001 From: Minchan Kim <minchan@kernel.org> Date: Wed, 15 Apr 2015 16:15:33 -0700 Subject: [PATCH] zsmalloc: adjust ZS_ALMOST_FULL Curretly, zsmalloc regards a zspage as ZS_ALMOST_EMPTY if the zspage has under 1/4 used objects(ie, fullness_threshold_frac). It could make result in loose packing since zsmalloc migrates only ZS_ALMOST_EMPTY zspage out. This patch changes the rule so that zsmalloc makes zspage which has above 3/4 used object ZS_ALMOST_FULL so it could make tight packing. Signed-off-by: Minchan Kim <minchan@kernel.org> Cc: Juneho Choi <juno.choi@lge.com> Cc: Gunho Lee <gunho.lee@lge.com> Cc: Luigi Semenzato <semenzato@google.com> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Seth Jennings <sjennings@variantweb.net> Cc: Nitin Gupta <ngupta@vflare.org> Cc: Jerome Marchand <jmarchan@redhat.com> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- mm/zsmalloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index c4ae608dc725b..3bd8b0a164629 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -480,7 +480,7 @@ static enum fullness_group get_fullness_group(struct page *page) fg = ZS_EMPTY; else if (inuse == max_objects) fg = ZS_FULL; - else if (inuse <= max_objects / fullness_threshold_frac) + else if (inuse <= 3 * max_objects / fullness_threshold_frac) fg = ZS_ALMOST_EMPTY; else fg = ZS_ALMOST_FULL; -- GitLab