linux-kernel - [PATCH] zsmalloc: zs_page_isolate: skip unnecessary loops but not return false if zspage is not inuse

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Date:   Wed, 16 Aug 2017 15:49:54 +0800
From:   Hui Zhu <zhuhui@...omi.com>
To:     <minchan@...nel.org>, <ngupta@...are.org>,
        <sergey.senozhatsky.work@...il.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
CC:     <teawater@...il.com>, Hui Zhu <zhuhui@...omi.com>
Subject: [PATCH] zsmalloc: zs_page_isolate: skip unnecessary loops but not return false if zspage is not inuse

Like [1], zs_page_isolate meet the same problem if zspage is not inuse.

After [2], zs_page_migrate can support empty zspage now.

Make this patch to let zs_page_isolate skip unnecessary loops but not
return false if zspage is not inuse.

[1] zsmalloc-zs_page_migrate-skip-unnecessary-loops-but-not-return-ebusy-if-zspage-is-not-inuse-fix.patch
[2] zsmalloc-zs_page_migrate-schedule-free_work-if-zspage-is-ZS_EMPTY.patch

Signed-off-by: Hui Zhu <zhuhui@...omi.com>
---
 mm/zsmalloc.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index fb99953..8560c93 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1927,11 +1927,6 @@ bool zs_page_isolate(struct page *page, isolate_mode_t mode)
 	class = pool->size_class[class_idx];
 
 	spin_lock(&class->lock);
-	if (get_zspage_inuse(zspage) == 0) {
-		spin_unlock(&class->lock);
-		return false;
-	}
-
 	/* zspage is isolated for object migration */
 	if (list_empty(&zspage->list) && !is_zspage_isolated(zspage)) {
 		spin_unlock(&class->lock);
-- 
1.9.1