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Xuehan Xu

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04/30/2019

12:08 PM Linux kernel client Feature #39542: ceph: cgroup controller for limiting client ops
please see patches "cgroup: add a new group controller for cephfs" and "ceph: use cephfs cgroup contoller to limit cl...
12:07 PM Linux kernel client Feature #39542 (New): ceph: cgroup controller for limiting client ops
Add a cgroup controller to limit cephfs client metadata and data ops in terms of iops and bandwidth

04/18/2019

08:03 AM fs Bug #39349: mds: cap revokes leak
Zheng Yan wrote:
> already fixed by https://github.com/ceph/ceph/pull/26713
yes, this is already fixed, please cl...

04/17/2019

07:50 AM fs Bug #39349: mds: cap revokes leak
These exists possibilities as follows:
1. some req make mds do simple_xlock on a filelock that's in LOCK_xlock...
07:25 AM fs Bug #39349 (Closed): mds: cap revokes leak
Recently, one of our clusters, after updating to 12.2.11, occasionally reports that "XXX clients failing to respond t...

11/22/2018

09:42 AM fs Bug #37368 (Resolved): mds: directories pinned keep being replicated back and forth between expor...
Recently, when developing the rstat propagation function, we found that when pinning some directory to a specific ran...

10/28/2018

02:05 PM Linux kernel client Feature #36609: Avoid sending duplicate concurrent "getattr", "lookup", "ceph_sync_read" requests
Please see patches: "ceph: issue getattr/lookup reqs to MDSes in an aggregative pattern" and "ceph: aggregate ceph_sy...
02:04 PM Linux kernel client Feature #36609 (New): Avoid sending duplicate concurrent "getattr", "lookup", "ceph_sync_read" re...
As for now, when there are multiple concurrent threads trying to access the same file, there might be a chance that t...
01:35 PM fs Feature #36608 (Need Review): Answering all pending getattr/lookups targeting the same inode in o...
As for now, all getattr/lookup requests get processes one by one, which is kind of wasting CPU resources. Actually, f...

10/10/2018

03:11 AM Linux kernel client Bug #36369: kclient: wanted caps takes a long time to release
Fixing patch: see "[PATCH] ceph: set timeout conditionally in __cap_delay_requeue" in ceph-devel mailing list

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