linux-kernel - Re: [PATCH 17/53] perf test: Improve bp

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Message-ID: <20160112141741.GH15737@arm.com>
Date:	Tue, 12 Jan 2016 14:17:42 +0000
From:	Will Deacon <will.deacon@....com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, Wang Nan <wangnan0@...wei.com>,
	linux-kernel@...r.kernel.org, pi3orama@....com, lizefan@...wei.com,
	netdev@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH 17/53] perf test: Improve bp_signal

On Tue, Jan 12, 2016 at 11:11:23AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Jan 12, 2016 at 10:21:29AM +0100, Jiri Olsa escreveu:
> > On Mon, Jan 11, 2016 at 06:37:29PM -0300, Arnaldo Carvalho de Melo wrote:
> > > Em Mon, Jan 11, 2016 at 01:48:08PM +0000, Wang Nan escreveu:
> > > > Will Deacon [1] has some question on patch [2]. This patch improves
> > > > test__bp_signal so we can test:
> > > > 
> > > >  1. A watchpoint and a breakpoint that fire on the same instruction
> > > >  2. Nested signals
> > > > 
> > > > Test result:
> > > > 
> > > >  On x86_64 and ARM64 (result are similar with patch [2] on ARM64):
> > > > 
> > > >  # ./perf test -v signal
> > > >  17: Test breakpoint overflow signal handler                  :
> > > >  --- start ---
> > > >  test child forked, pid 10213
> > > >  count1 1, count2 3, count3 2, overflow 3, overflows_2 3
> > > >  test child finished with 0
> > > >  ---- end ----
> > > >  Test breakpoint overflow signal handler: Ok
> > > > 
> > > > So at least 2 cases Will doubted are handled correctly.
> > > > 
> > > > [1] http://lkml.kernel.org/g/20160104165535.GI1616@arm.com
> > > > [2] http://lkml.kernel.org/g/1450921362-198371-1-git-send-email-wangnan0@huawei.com
> > > > 
> > > > Signed-off-by: Wang Nan <wangnan0@...wei.com>
> > > > Cc: Will Deacon <will.deacon@....com>
> > > 
> > > Will, are you ok with this one? Can I have an Acked-by or better,
> > > Tested-by for the AARCH64 base?
> > > 
> > > IIRC Jiri made some comment about this one?
> > 
> > I thought I acked this one.. all comments were addresses, so:
> > 
> > Acked-by: Jiri Olsa <jolsa@...nel.org>
> 
> Ok, so, Will, any comments? Nack?

Sorry, snowed under at the moment. I need to go back over the arch/arm64
patch, since I did have some concerns on that and the changes to the
perf tool don't do a lot without the corresponding architecture update
which I'm extremely nervous about.

I'll revisit that patch once I've got through the more pressing changes
in the queue.

Will