linux-kernel - Re: Scrolling down broken with "perf top --hierarchy"

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Message-ID: <20161008112124.GA304@x4>
Date:   Sat, 8 Oct 2016 13:21:24 +0200
From:   Markus Trippelsdorf <markus@...ppelsdorf.de>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Scrolling down broken with "perf top --hierarchy"

On 2016.10.07 at 07:09 +0200, Markus Trippelsdorf wrote:
> On 2016.10.07 at 06:56 +0200, Markus Trippelsdorf wrote:
> > On 2016.10.07 at 06:32 +0200, Markus Trippelsdorf wrote:
> > > On 2016.10.07 at 13:22 +0900, Namhyung Kim wrote:
> > > > On Fri, Oct 07, 2016 at 05:51:18AM +0200, Markus Trippelsdorf wrote:
> > > > > On 2016.10.07 at 10:17 +0900, Namhyung Kim wrote:
> > > > > > On Thu, Oct 06, 2016 at 06:33:33PM +0200, Markus Trippelsdorf wrote:
> > > > > > > Scrolling down is broken when using "perf top --hierarchy".
> > > > > > > When it starts up everything is OK and one can scroll up and down to all
> > > > > > > entries. But as further and further new entries get added to the list,
> > > > > > > scrolling down is blocked (at the position of the last entry that was
> > > > > > > shown directly after startup).
> > > > > > 
> > > > > > I think below patch will fix the problem.  Please check.
> > > > > 
> > > > > Yes. It works fine now. Many thanks.
> > > > 
> > > > Good.  Can I add your Tested-by then?
> > > 
> > > Sure. 
> > 
> > And BTW symbols are currently always cut off at 60 characters in
> > expanded entries.
> 
> Hmm, no. Sometimes they are cut off, sometimes they are not. I haven't
> figured out what triggered this strange behavior.

Here is an example:

 % echo $COLUMNS
 179
 % perf top --hierarchy
+  34.81%     [kernel]
-  20.89%     chrome
       0.51%     [.] v8::internal::IncrementalMarking:
       0.43%     [.] tc_malloc
       0.29%     [.] sqlite3BtreeMovetoUnpacked
       0.28%     [.] tc_free
       0.24%     [.] v8::internal::BodyDescriptorBase:
       0.24%     [.] sqlite3VdbeExec
       0.22%     [.] v8::internal::MarkCompactCollecto
       0.19%     [.] blink::SelectorChecker::checkOne
       0.19%     [.] SkBlitRow::Color32
       0.18%     [.] SkBlitLCD16OpaqueRow_SSE2
       0.17%     [.] btreeInitPage.part.366
       0.16%     [.] blink::SelectorChecker::matchSele
       0.15%     [.] blink::ElementRuleCollector::coll
       0.15%     [.] blink::CSSTokenizer::consumeName
       0.14%     [.] sqlite3GetVarint
       0.13%     [.] operator new[]
       0.12%     [.] FPDFAPI_inflate_fast
       0.11%     [.] v8::internal::HeapObject::SizeFro
       0.09%     [.] tracked_objects::ThreadData::Tall
...

-- 
Markus