From: Alex Elder Date: Mon, 25 Mar 2013 23:16:11 +0000 (-0500) Subject: libceph: keep request lists in tid order X-Git-Tag: firefly_0821_release~3680^2~249^2~219 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ad885927dee2e72fbfab624c7599cb9d9352cc04;p=firefly-linux-kernel-4.4.55.git libceph: keep request lists in tid order In __map_request(), when adding a request to an osd client's unsent list, add it to the tail rather than the head. That way the newest entries (with the highest tid value) will be last. Maintain an osd's request list in order of increasing tid also. Finally--to be consistent--maintain an osd client's "notarget" list in that order as well. This partially resolves: http://tracker.ceph.com/issues/4392 Signed-off-by: Alex Elder Reviewed-off-by: Sage Weil --- diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 8b84fb4980ba..356f7bc4ae4b 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -619,7 +619,7 @@ static void __kick_osd_requests(struct ceph_osd_client *osdc, BUG_ON(!list_empty(&req->r_req_lru_item)); __register_request(osdc, req); list_add_tail(&req->r_req_lru_item, &osdc->req_unsent); - list_add(&req->r_osd_item, &req->r_osd->o_requests); + list_add_tail(&req->r_osd_item, &req->r_osd->o_requests); __unregister_linger_request(osdc, req); dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid, osd->o_osd); @@ -1035,10 +1035,10 @@ static int __map_request(struct ceph_osd_client *osdc, if (req->r_osd) { __remove_osd_from_lru(req->r_osd); - list_add(&req->r_osd_item, &req->r_osd->o_requests); - list_move(&req->r_req_lru_item, &osdc->req_unsent); + list_add_tail(&req->r_osd_item, &req->r_osd->o_requests); + list_move_tail(&req->r_req_lru_item, &osdc->req_unsent); } else { - list_move(&req->r_req_lru_item, &osdc->req_notarget); + list_move_tail(&req->r_req_lru_item, &osdc->req_notarget); } err = 1; /* osd or pg changed */