4.2.8-ckt8 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: David Disseldorp <ddiss@xxxxxxx>
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@xxxxxxx>
Suggested-by: Neil Brown <neilb@xxxxxxxx>
Signed-off-by: David Disseldorp <ddiss@xxxxxxx>
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
drivers/block/rbd.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
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) {
--
2.7.4
--
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