From: Mikulas Patocka <mpatocka@redhat.com>
Date: Fri, 15 Jul 2016 21:30:20 +0000 (-0400)
Subject: dm crypt: increase mempool reserve to better support swapping
X-Git-Tag: v4.14-rc1~2609^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0a83df6c8cacafbefc5b56b2fbcb92b0d75b744b;p=platform%2Fkernel%2Flinux-rpi.git

dm crypt: increase mempool reserve to better support swapping

Increase mempool size from 16 to 64 entries.  This increase improves
swap on dm-crypt performance.

When swapping to dm-crypt, all available memory is temporarily exhausted
and dm-crypt can only use the mempool reserve.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 4e9784b..eedba67 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -181,7 +181,7 @@ struct crypt_config {
 	u8 key[0];
 };
 
-#define MIN_IOS        16
+#define MIN_IOS        64
 
 static void clone_init(struct dm_crypt_io *, struct bio *);
 static void kcryptd_queue_crypt(struct dm_crypt_io *io);