From: Jeff Moyer <jmoyer@redhat.com>
To: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-nvdimm <linux-nvdimm@ml01.01.org>,
linux-ext4 <linux-ext4@vger.kernel.org>,
Ross Zwisler <ross.zwisler@intel.com>
Subject: Re: dax pmd fault handler never returns to userspace
Date: Wed, 18 Nov 2015 13:32:46 -0500 [thread overview]
Message-ID: <x49lh9vma41.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <20151118182320.GA7901@linux.intel.com> (Ross Zwisler's message of "Wed, 18 Nov 2015 11:23:20 -0700")
Ross Zwisler <ross.zwisler@linux.intel.com> writes:
> Yea, my first round of testing was broken, sorry about that.
>
> It looks like this test causes the PMD fault handler to be called repeatedly
> over and over until you kill the userspace process. This doesn't happen for
> XFS because when using XFS this test doesn't hit PMD faults, only PTE faults.
Hmm, I wonder why not? Sounds like that will need investigating as
well, right?
-Jeff
> So, looks like a livelock as far as I can tell.
>
> Still debugging.
Thanks!
Jeff
next prev parent reply other threads:[~2015-11-18 18:32 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-18 15:53 dax pmd fault handler never returns to userspace Jeff Moyer
2015-11-18 15:56 ` Zwisler, Ross
2015-11-18 16:52 ` Dan Williams
2015-11-18 17:00 ` Ross Zwisler
2015-11-18 17:43 ` Jeff Moyer
2015-11-18 18:10 ` Dan Williams
2015-11-18 18:23 ` Ross Zwisler
2015-11-18 18:32 ` Jeff Moyer [this message]
2015-11-18 18:53 ` Ross Zwisler
2015-11-18 18:58 ` Dan Williams
2015-11-19 22:34 ` Dave Chinner
2015-11-18 21:33 ` Toshi Kani
2015-11-18 21:57 ` Dan Williams
2015-11-18 22:04 ` Toshi Kani
2015-11-19 0:36 ` Ross Zwisler
2015-11-19 0:39 ` Dan Williams
2015-11-19 1:05 ` Toshi Kani
2015-11-19 1:19 ` Dan Williams
2015-11-18 18:30 ` Jeff Moyer
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