linux-kernel - [PATCH] mm/vmscan.c: drop all inode/dentry cache from LRU

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Message-Id: <1558685161-860-1-git-send-email-stummala@codeaurora.org>
Date:   Fri, 24 May 2019 13:36:01 +0530
From:   Sahitya Tummala <stummala@...eaurora.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Yafang Shao <laoar.shao@...il.com>,
        Roman Gushchin <guro@...com>,
        Mel Gorman <mgorman@...hsingularity.net>, linux-mm@...ck.org,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Eric Biggers <ebiggers@...nel.org>,
        linux-fscrypt@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Sahitya Tummala <stummala@...eaurora.org>
Subject: [PATCH] mm/vmscan.c: drop all inode/dentry cache from LRU

This is important for the scenario where FBE (file based encryption)
is enabled. With FBE, the encryption context needed to en/decrypt a file
will be stored in inode and any inode that is left in the cache after
drop_caches is done will be a problem. For ex, in Android, drop_caches
will be used when switching work profiles.

Signed-off-by: Sahitya Tummala <stummala@...eaurora.org>
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index d96c547..b48926f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -730,7 +730,7 @@ void drop_slab_node(int nid)
 		do {
 			freed += shrink_slab(GFP_KERNEL, nid, memcg, 0);
 		} while ((memcg = mem_cgroup_iter(NULL, memcg, NULL)) != NULL);
-	} while (freed > 10);
+	} while (freed != 0);
 }
 
 void drop_slab(void)
-- 
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Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.