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[4.2.y-ckt,stable] Patch "rbd: use GFP_NOIO consistently for request allocations" has been added to the 4.2.y-ckt tree

Message ID 1460414071-25314-1-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa April 11, 2016, 10:34 p.m. UTC 
This is a note to let you know that I have just added a patch titled

    rbd: use GFP_NOIO consistently for request allocations

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt8.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

From f3683ada04b1f9b00d804fbfd2d5986f9ebebb30 Mon Sep 17 00:00:00 2001
From: David Disseldorp <ddiss@suse.de>
Date: Tue, 5 Apr 2016 11:13:39 +0200
Subject: rbd: use GFP_NOIO consistently for request allocations

commit 2224d879c7c0f85c14183ef82eb48bd875ceb599 upstream.

As of 5a60e87603c4c533492c515b7f62578189b03c9c, RBD object request
allocations are made via rbd_obj_request_create() with GFP_NOIO.
However, subsequent OSD request allocations in rbd_osd_req_create*()
use GFP_ATOMIC.

With heavy page cache usage (e.g. OSDs running on same host as krbd
client), rbd_osd_req_create() order-1 GFP_ATOMIC allocations have been
observed to fail, where direct reclaim would have allowed GFP_NOIO
allocations to succeed.

Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Suggested-by: Neil Brown <neilb@suse.com>
Signed-off-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/block/rbd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--
2.7.4
diff mbox

Patch

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 55f8a6a..5252117 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1955,7 +1955,7 @@  static struct ceph_osd_request *rbd_osd_req_create(

 	osdc = &rbd_dev->rbd_client->client->osdc;
 	osd_req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false,
-					  GFP_ATOMIC);
+					  GFP_NOIO);
 	if (!osd_req)
 		return NULL;	/* ENOMEM */

@@ -2004,7 +2004,7 @@  rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request)
 	rbd_dev = img_request->rbd_dev;
 	osdc = &rbd_dev->rbd_client->client->osdc;
 	osd_req = ceph_osdc_alloc_request(osdc, snapc, num_osd_ops,
-						false, GFP_ATOMIC);
+						false, GFP_NOIO);
 	if (!osd_req)
 		return NULL;	/* ENOMEM */

@@ -2503,7 +2503,7 @@  static int rbd_img_request_fill(struct rbd_img_request *img_request,
 					bio_chain_clone_range(&bio_list,
 								&bio_offset,
 								clone_size,
-								GFP_ATOMIC);
+								GFP_NOIO);
 			if (!obj_request->bio_list)
 				goto out_unwind;
 		} else if (type == OBJ_REQUEST_PAGES) {