Hi all, We reproduced and debugged several hangs in a rhel6.3 kernel that happened to still support xfsaild idle mode. Our short term fix was to disable idle mode as in upstream, but I'd like to fire out a couple potential fixes that allow us to re-enable idle mode, assuming there aren't any other problems I'm not aware of. The details of the bug are at: https://bugzilla.redhat.com/show_bug.cgi?id=813137 ... but I'll try to provide all relevant data in this post. The reproducer is xfstests 273 running in a 100-iteration loop. I have reproduced this hang on upstream kernels quite reliably with commit 670ce93f reverted. The performance enhancement in that commit makes this much harder to reproduce. With the proposed modifications, I've probably run 5+ 100-loop iterations of test 273 without reproducing a hang. Previously, I was able to reproduce the first hang with 100% reliability and the second hang reproduced 10 minutes or so after starting a second 100-loop test (with the first fix applied). I still have to run a full xfstests but the changes are small enough that I wanted to send them out before I got too far. Thanks. Changes since v2: - Rebased against git://oss.sgi.com/xfs/xfs. - Combined patches 1 and 2. Changes since v1: - Rebased against a pristine tree. Brian Foster (2): xfs: re-enable xfsaild idle mode when the ail is empty xfs: fix xfsaild hang due to lost wake ups fs/xfs/xfs_trans_ail.c | 9 ++++++--- fs/xfs/xfs_trans_priv.h | 1 + 2 files changed, 7 insertions(+), 3 deletions(-) -- 1.7.7.6 _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
