From: Wei Liu <wei.liu2@citrix.com>
To: George Dunlap <george.dunlap@citrix.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Wei Liu <wei.liu2@citrix.com>,
George Dunlap <George.Dunlap@eu.citrix.com>,
AndrewCooper <andrew.cooper3@citrix.com>,
Ian Jackson <ian.jackson@eu.citrix.com>, Tim Deegan <tim@xen.org>,
philippe.gabriel@citrix.com, Jan Beulich <JBeulich@suse.com>,
Xen-devel <xen-devel@lists.xenproject.org>
Subject: Re: [PATCH v3] gcov: add new interface and 3.4 and 4.7 format support
Date: Wed, 12 Oct 2016 14:31:31 +0100 [thread overview]
Message-ID: <20161012133131.GO3687@citrix.com> (raw)
In-Reply-To: <91e9a42b-f444-735f-759f-6abb7eaa1b89@citrix.com>
On Wed, Oct 12, 2016 at 02:26:26PM +0100, George Dunlap wrote:
[...]
> >>
> >> There is a version field in gcov_info, so we can compare that and reject
> >> incompatible version.
> >>
> >> We need to use hooks in livepatching to call the constructor /
> >> destructor when applying / reverting a live-patch. We might need to be
> >> cautious about locks or whatever, but I'm sure it can be figured out.
> >>
> >> But I have no idea how useful it would be to use gcov and livepatching
> >> together. For now the easiest thing to do is to
> >>
> >> depends on !LIVEPATCH
> >>
> >> in Kconfig.
> >
> > Wouldn't it be just as easy, and more useful, to set a "has been
> > livepatched" flag, and return errors for all gcov hypercalls if its' set?
> >
> > I would expect most users to want to build a single hypervisor that can
> > be used for both gcov testing and live patching (under different
> > circumstances).
>
> I mean software provider, not user, of course. That's what I would want
> for CentOS, and I'm sure that's what the XenServer (and probably Oracle)
> guys want as well.
>
The usefulness of such build is not as big as you might think I'm
afraid -- it wouldn't be useful until we figure out how to apply a
livepatch generated with gcov support built in.
Wei.
> -George
>
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next prev parent reply other threads:[~2016-10-12 13:32 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-10 9:40 [PATCH v2 0/9] Rework gcov support in Xen Wei Liu
2016-10-10 9:40 ` [PATCH v2 1/9] Kconfig: use tab instead of space Wei Liu
2016-10-10 11:21 ` Jan Beulich
2016-10-10 9:40 ` [PATCH v2 2/9] Kconfig: add BROKEN config Wei Liu
2016-10-10 11:22 ` Jan Beulich
2016-10-10 9:40 ` [PATCH v2 3/9] xen: delete gcno files in clean target Wei Liu
2016-10-10 11:23 ` Jan Beulich
2016-10-10 9:40 ` [PATCH v2 4/9] xen, tools: rip out old gcov implementation Wei Liu
2016-10-10 11:24 ` Jan Beulich
2016-10-10 9:40 ` [PATCH v2 5/9] gcov: add new interface and 3.4 and 4.7 format support Wei Liu
2016-10-10 11:56 ` Jan Beulich
2016-10-10 12:23 ` Andrew Cooper
2016-10-10 12:56 ` Jan Beulich
2016-10-10 13:12 ` Wei Liu
2016-10-10 13:11 ` Wei Liu
2016-10-10 14:43 ` Wei Liu
2016-10-11 10:31 ` [PATCH v3] " Wei Liu
2016-10-12 12:42 ` Jan Beulich
2016-10-12 13:06 ` Wei Liu
2016-10-12 13:11 ` Jan Beulich
2016-10-12 13:24 ` George Dunlap
2016-10-12 13:26 ` George Dunlap
2016-10-12 13:31 ` Wei Liu [this message]
2016-10-12 13:33 ` Jan Beulich
2016-10-12 13:34 ` Andrew Cooper
2016-10-12 13:41 ` George Dunlap
2016-10-12 13:43 ` Andrew Cooper
2016-10-12 13:29 ` Konrad Rzeszutek Wilk
2016-10-12 13:40 ` Wei Liu
2016-10-12 13:46 ` Konrad Rzeszutek Wilk
2016-10-12 13:50 ` Wei Liu
2016-10-12 13:23 ` Konrad Rzeszutek Wilk
2016-10-12 13:31 ` Jan Beulich
2016-10-12 13:44 ` Konrad Rzeszutek Wilk
2016-10-12 14:08 ` Jan Beulich
2016-10-12 14:17 ` Martin Pohlack
2016-10-12 16:21 ` Konrad Rzeszutek Wilk
2016-10-13 8:05 ` Martin Pohlack
2016-10-12 15:33 ` Wei Liu
2016-10-12 15:42 ` Jan Beulich
2016-10-12 17:07 ` Wei Liu
2016-10-13 8:29 ` Jan Beulich
2016-10-13 8:49 ` Wei Liu
2016-10-13 9:15 ` Jan Beulich
2016-10-13 9:20 ` Wei Liu
2016-10-10 9:40 ` [PATCH v2 6/9] gcov: userspace tools to extract and split gcov data Wei Liu
2016-10-10 15:44 ` Ian Jackson
2016-10-10 9:40 ` [PATCH v2 7/9] Config.mk: expand cc-ver a bit Wei Liu
2016-10-10 11:57 ` Jan Beulich
2016-10-10 9:40 ` [PATCH v2 8/9] Config.mk: introduce cc-ifversion Wei Liu
2016-10-10 12:00 ` Jan Beulich
2016-10-10 13:18 ` Wei Liu
2016-10-10 13:22 ` Jan Beulich
2016-10-10 13:24 ` Wei Liu
2016-10-10 9:40 ` [PATCH v2 9/9] gcov: provide the capability to select gcov format automatically Wei Liu
2016-10-10 12:00 ` Jan Beulich
2016-10-10 15:47 ` [PATCH v2 0/9] Rework gcov support in Xen Ian Jackson
2016-10-10 15:58 ` Jan Beulich
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