linux-kernel - Re: [PATCH 09/21] perf, c2c: Add rbtree sorted on mmap2 data

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Message-ID: <20140226031234.GR25953@redhat.com>
Date:	Tue, 25 Feb 2014 22:12:34 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	acme@...stprotocols.net, LKML <linux-kernel@...r.kernel.org>,
	jmario@...hat.com, fowles@...each.com, eranian@...gle.com
Subject: Re: [PATCH 09/21] perf, c2c: Add rbtree sorted on mmap2 data

On Fri, Feb 21, 2014 at 05:59:28PM +0100, Jiri Olsa wrote:
> On Thu, Feb 20, 2014 at 09:45:53PM -0500, Don Zickus wrote:
> > On Tue, Feb 18, 2014 at 02:04:05PM +0100, Jiri Olsa wrote:
> > > On Mon, Feb 10, 2014 at 12:29:04PM -0500, Don Zickus wrote:
> 
> SNIP
> 
> > > > +
> > > > +		if (l > r) return 1;
> > > > +		if (l < r) return -1;
> > > > +
> > > > +		/* sorting by iaddr makes calculations easier later */
> > > > +		if (left->mi->iaddr.al_addr > right->mi->iaddr.al_addr) return 1;
> > > > +		if (left->mi->iaddr.al_addr < right->mi->iaddr.al_addr) return -1;
> > > > +	}
> > > > +
> > > > +	return 0;
> > > > +}
> > > 
> > > there's sort object doing exatly this over hist_entry's
> > > 
> > > Is there any reason not to use hist_entries?
> > 
> > So looking over hist_entry, I realize, what do I gain?  I implemented it
> > and realized I had to add, 'cpumode', 'tid' and a 'private' field to
> > struct hist_entry.  Then because I have my own report implementation, I
> > still have to copy and paste a ton of stuff from builtin-report over to
> > here (including callchain support).
> 
> you mean new sort_entry objects?
> 
> > 
> > Not unless you are expecting me to add giant chunks of code to
> > builtin-report.c?
> 
> it can be separated object, implementing new report iterator
> 
> I think that we should go on with existing sort code we have..
> but I understand you might need some special usage.. i'll dive
> in and try to find some answer ;-)

Do things fall apart if I do not use evsel->hists to store the hist_entry
tree?  I need to combine two events (store and load) on to the same tree.

Cheers,
Don
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