linux-kernel - Re: [PATCH RFC V2 00/10] perf top optimization

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Message-ID: <20170914211946.GB10371@kernel.org>
Date:   Thu, 14 Sep 2017 18:19:46 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     "Liang, Kan" <kan.liang@...el.com>
Cc:     "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "Hunter, Adrian" <adrian.hunter@...el.com>,
        "Odzioba, Lukasz" <lukasz.odzioba@...el.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: Re: [PATCH RFC V2 00/10] perf top optimization

Em Wed, Sep 13, 2017 at 12:38:19PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Sep 13, 2017 at 03:29:44PM +0000, Liang, Kan escreveu:
> > > 
> > > Em Sun, Sep 10, 2017 at 07:23:13PM -0700, kan.liang@...el.com escreveu:
> > > 
> > > So I got the first two patches already merged, and made some comments
> > > about the other patches, please check those,
> > > 
> > 
> > Thanks for the review Arnaldo.
> > 
> > I will take a close look for the comments. 
> > For the next version, I only need to include patch 3-10, correct?
> 
> Right, and go from my perf/core branch. The hashtable patch is still not
> there as I am running tests before pushing out, but it should be there
> later today.

So, its at my repo, branch tmp.perf/threads_hashtable

But 'perf trace' is broken, please take a look below:

[root@...et ~]# gdb -c core
GNU gdb (GDB) Fedora 8.0-20.fc26
<SNIP>
Core was generated by `perf trace -e block:block_bio_queue'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000000000051089a in ?? ()
(gdb) file perf
Reading symbols from perf...done.
(gdb) bt
#0  0x000000000051089a in ____machine__findnew_thread (machine=0x3dfcab0, threads=0x3dfca78, pid=-1, tid=-1, create=false) at util/machine.c:429
#1  0x0000000000510b49 in machine__find_thread (machine=0x3dfcab0, pid=-1, tid=-1) at util/machine.c:498
#2  0x0000000000483dd0 in trace__set_filter_loop_pids (trace=0x7ffc0d23f880) at builtin-trace.c:2247
#3  0x000000000048438b in trace__run (trace=0x7ffc0d23f880, argc=0, argv=0x7ffc0d242a00) at builtin-trace.c:2385
#4  0x0000000000487219 in cmd_trace (argc=0, argv=0x7ffc0d242a00) at builtin-trace.c:3121
#5  0x00000000004c0b4a in run_builtin (p=0xa75d00 <commands+576>, argc=3, argv=0x7ffc0d242a00) at perf.c:296
#6  0x00000000004c0db7 in handle_internal_command (argc=3, argv=0x7ffc0d242a00) at perf.c:348
#7  0x00000000004c0f09 in run_argv (argcp=0x7ffc0d24285c, argv=0x7ffc0d242850) at perf.c:392
#8  0x00000000004c12d7 in main (argc=3, argv=0x7ffc0d242a00) at perf.c:536
(gdb)