Re: [PATCH 5/5] perf diff: Fix -o/--order option behavior
From: Jiri Olsa
Date: Wed Jan 07 2015 - 03:10:25 EST
On Wed, Jan 07, 2015 at 04:47:06PM +0900, Namhyung Kim wrote:
> On Sun, Jan 04, 2015 at 07:26:56PM +0100, Jiri Olsa wrote:
> > On Sat, Dec 27, 2014 at 02:06:33PM +0900, Namhyung Kim wrote:
> >
> > SNIP
> >
> > > + return 0;
> > > +
> > > + fmt = zalloc(sizeof(*fmt));
> > > + if (fmt == NULL) {
> > > + pr_err("Memory allocation failed\n");
> > > + return -1;
> > > + }
> > > +
> > > + fmt->cmp = hist_entry__cmp_nop;
> > > + fmt->collapse = hist_entry__cmp_nop;
> > > +
> > > + switch (compute) {
> > > + case COMPUTE_DELTA:
> > > + fmt->sort = hist_entry__cmp_delta_idx;
> > > + break;
> > > + case COMPUTE_RATIO:
> > > + fmt->sort = hist_entry__cmp_ratio_idx;
> > > + break;
> > > + case COMPUTE_WEIGHTED_DIFF:
> > > + fmt->sort = hist_entry__cmp_wdiff_idx;
> > > + break;
> > > + default:
> > > + BUG_ON(1);
> > > + }
> > > +
> > > + list_add(&fmt->sort_list, &perf_hpp__sort_list);
> > > + return 0;
> >
> > so the first 'fmt' which gets to sorting is the one for
> > data__files[sort_idx] file, that sounds good..
> >
> > but as the sorting goes through all the perf_hpp__sort_list list,
> > it will hit the 'sort_idx' data again.. should you disable sort
> > function for its 'fmt' then?
>
> Do you really think it's needed?
>
> Yes, it'll be called twice but I think it's a relatively rare case as
> most entries will be sorted by the sort_idx and baseline columns.
I did not think it through completely.. thats why I asked ;-)
but I think you're right and it's not a big deal, maybe just
add some comment that this is happening and we dont think
it's too bad.. or something like that ;-)
thanks,
jirka
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/