Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966121AbcDLV2t (ORCPT ); Tue, 12 Apr 2016 17:28:49 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:50813 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966463AbcDLUxu (ORCPT ); Tue, 12 Apr 2016 16:53:50 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: David Disseldorp , Ilya Dryomov , Kamal Mostafa Subject: [PATCH 4.2.y-ckt 40/70] rbd: use GFP_NOIO consistently for request allocations Date: Tue, 12 Apr 2016 13:52:25 -0700 Message-Id: <1460494375-30070-41-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1460494375-30070-1-git-send-email-kamal@canonical.com> References: <1460494375-30070-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 4.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2080 Lines: 60 4.2.8-ckt8 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ From: David Disseldorp 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 Suggested-by: Neil Brown Signed-off-by: David Disseldorp Signed-off-by: Ilya Dryomov Signed-off-by: Kamal Mostafa --- 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