linux-kernel - Re: [PATCH v4 1/2] perf tool: encapsulate dsos list head into struct dsos

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Message-ID: <20140929180959.GG3879@kernel.org>
Date:	Mon, 29 Sep 2014 15:09:59 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Waiman Long <waiman.long@...com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Scott J Norton <scott.norton@...com>,
	Douglas Hatch <doug.hatch@...com>,
	Don Zickus <dzickus@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH v4 1/2] perf tool: encapsulate dsos list head into struct
 dsos

Em Mon, Sep 29, 2014 at 01:30:07PM -0400, Waiman Long escreveu:
> On 09/28/2014 11:54 PM, Namhyung Kim wrote:
> >On Fri, 26 Sep 2014 11:06:25 -0300, Arnaldo Carvalho de Melo wrote:
> >>Em Wed, Sep 24, 2014 at 11:45:39AM -0400, Waiman Long escreveu:
> >>>This is a precursor patch to enable long name searching of DSOs
> >>>using the rbtree. In this patch, a new dsos structure is created
> >>>which contains only a list head structure for the moment. The new
> >>>dsos structure is used, in turn, in the machine structure for the
> >>>user_dsos and kernel_dsos fields. Only the following 3 dsos functions
> >>>are modified to accept the new dsos structure parameter instead
> >>>of list_head:
> >>>  - dsos__add()
> >>>  - dsos__find()
> >>>  - __dsos__findnew()
> >>>
> >>>Because of the need to find out the corresponding dsos structure to
> >>>properly call dsos__add() in dso__load_sym() of util/symbol-elf.c,
> >>>a new dsos field is also added to the dso structure.
> >>Argh, yeah, that is unfortunate that we need to add entries that deep
> >>inside dso__load_syms() :-\
> >But it seems we can use map->groups->machine to find out the head/root
> >of the dsos..

> There are 2 dsos at the machine structure level - user_dsos and kernel_dsos.
> In this particular case, it should be kernel_dsos. I can remove the dsos
> pointer and hardcode it to use the kernel_dsos if you guys think it is
> acceptable.

Yes, I think that if we have already how to obtain the head/root where
we want to insert things from structures present at that point in the
code, no need to add it to the per-dso data structure.

Thanks to Namhyung for finding an existing way of getting to the needed
data structures.

- Arnaldo
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