linux-kernel - Re: [PATCH V2 1/3] perf,tools: get correct cpu id for print

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Date:	Fri, 28 Aug 2015 11:23:31 -0300
From:	"acme@...nel.org" <acme@...nel.org>
To:	"Liang, Kan" <kan.liang@...el.com>
Cc:	Jiri Olsa <jolsa@...hat.com>,
	"jolsa@...nel.org" <jolsa@...nel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"namhyung@...nel.org" <namhyung@...nel.org>,
	"eranian@...gle.com" <eranian@...gle.com>,
	"Hunter, Adrian" <adrian.hunter@...el.com>,
	"dsahern@...il.com" <dsahern@...il.com>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 1/3] perf,tools: get correct cpu id for print_aggr

Em Fri, Aug 28, 2015 at 01:33:22PM +0000, Liang, Kan escreveu:
> > On Thu, Jul 02, 2015 at 03:08:43AM -0400, kan.liang@...el.com wrote:
> > > From: Kan Liang <kan.liang@...el.com>
> > > print_aggr fails to print per-core/per-socket statistics after commit
> > > 582ec0829b3d ("perf stat: Fix per-socket output bug for uncore
> > > events") if events have differnt cpus. Because in print_aggr,
> > > aggr_get_id needs index (not cpu id) to find core/pkg id. Also, evsel
> > > cpu maps should be used to get aggregated id.
> > > Signed-off-by: Kan Liang <kan.liang@...el.com>

> > Acked-by: Jiri Olsa <jolsa@...nel.org>
 
> Hi Arnaldo,
 
> Could you please merge this patch?
> This patch is to fix a bug of perf stat. It doesn't depend on
> other patches of the patchset, and can be merged by itself.

Right, in such cases, please, make it clear against which branch this
should be applied, i.e. if this is a longstanding bug that needs to go
to perf/urgent, i.e. to the current merge window, ASAP, or if this
is for something that was introduced in the current development branch,
perf/core.

In this case it needs to go to perf/urgent, where it applies cleanly,
perf/core has extra stuff there that fuzzes a bit.

Also, since you know the cset where this bug was introduced, please
consider adding a "Fixes:" tag, commom everywhere in the kernel:

  [acme@zoo linux]$ git log | grep '^[ \t]\+Fixes:'  | wc -l
  3805

And we use it in tools/, sometime I add it while editing changelogs,
like in this patch:

  [acme@zoo linux]$ git log tools/ | grep '^[ \t]\+Fixes:' | head -5
    Fixes: 582ec0829b3d ("perf stat: Fix per-socket output bug for uncore events")
    Fixes: b685ac22b436 ("perf symbols: Add front end cache for DSO symbol lookup")
    Fixes: 06b234ec26fd ("perf script: Don't assume evsel position of tracking events")
    Fixes: d4957633bf9d ("perf report: Add infrastructure for a cycles histogram")
    Fixes: 75186a9b09e4 ("perf probe: Fix to show lines of sys_ functions correctly")
  [acme@zoo linux]$

- Arnaldo
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