From: Olaf Hering <olaf@aepfle.de>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>,
Greg KH <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org, devel@linuxdriverproject.org,
apw@canonical.com, jasowang@redhat.com
Subject: Re: [PATCH 2/5] hv: add helpers to handle hv_util device state
Date: Mon, 21 Sep 2015 14:17:06 +0200 [thread overview]
Message-ID: <20150921121706.GA9172@aepfle.de> (raw)
In-Reply-To: <87y4g0hv4d.fsf@vitty.brq.redhat.com>
On Mon, Sep 21, Vitaly Kuznetsov wrote:
> I'd like to see a trace from the hang, it is not obvious to me how it
> happened and what caused it. (or if you have such hang scenario in your
> head, can you please reveal it?)
There is no trace. I think fcopy_respond_to_host notifies the host,
which in turn triggers an interrupt right away which is processed while
fcopy_on_msg is executing somewhere between the return from
fcopy_respond_to_host and the call into hv_fcopy_onchannelcallback.
> AFAICS barriers you introduced don't give you guarantees in an SMP environment.
Happens to work on x86, and for this purpose. I will see how to add
locking around access to state and context.
Olaf
next prev parent reply other threads:[~2015-09-21 12:17 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-16 0:37 [PATCH 0/5] Drivers: hv: Miscellaneous fixes K. Y. Srinivasan
2015-09-16 0:37 ` [PATCH 1/5] Drivers: hv: vmbus: fix init_vp_index() for reloading hv_netvsc K. Y. Srinivasan
2015-09-16 0:37 ` [PATCH 2/5] hv: add helpers to handle hv_util device state K. Y. Srinivasan
2015-09-21 5:25 ` Greg KH
2015-09-21 10:26 ` Olaf Hering
2015-09-21 11:25 ` Vitaly Kuznetsov
2015-09-21 12:17 ` Olaf Hering [this message]
2015-09-21 13:37 ` Vitaly Kuznetsov
2015-09-21 16:45 ` KY Srinivasan
2015-09-21 16:34 ` KY Srinivasan
2015-09-21 16:43 ` Greg KH
2015-09-21 17:00 ` KY Srinivasan
2015-09-16 0:37 ` [PATCH 3/5] hv: fcopy: use wrappers to propagate state K. Y. Srinivasan
2015-09-16 0:37 ` [PATCH 4/5] hv: kvp: use wrappers to propaigate state K. Y. Srinivasan
2015-09-21 5:26 ` Greg KH
2015-09-21 10:18 ` Olaf Hering
2015-09-21 16:31 ` KY Srinivasan
2015-09-21 16:16 ` KY Srinivasan
2015-09-16 0:37 ` [PATCH 5/5] hv: vss: use wrappers to propagate state K. Y. Srinivasan
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