lo ;
> linux-kernel ; Peter Zijlstra
> ; Andi Kleen ; Libin (Huawei)
> ; Ingo Molnar ;
> linux-arm-ker...@lists.infradead.org
> Subject: Re: [PATCH 1/2] perf stat: Fix segfault when counting armv8_pmu
> events
>
> On Thu, Sep 24, 2020 at 11:36:23PM +0900, Namhyung Kim wrote:
On Thu, Sep 24, 2020 at 11:36:23PM +0900, Namhyung Kim wrote:
> On Wed, Sep 23, 2020 at 10:19:00PM +0200, Jiri Olsa wrote:
> > On Wed, Sep 23, 2020 at 11:15:06PM +0900, Namhyung Kim wrote:
> > > I think the problem is that armv8_pmu has a cpumask,
> > > and the user requested per-task events.
> >
On Thu, Sep 24, 2020 at 11:36:23PM +0900, Namhyung Kim wrote:
> On Wed, Sep 23, 2020 at 10:19:00PM +0200, Jiri Olsa wrote:
> > On Wed, Sep 23, 2020 at 11:15:06PM +0900, Namhyung Kim wrote:
> > > I think the problem is that armv8_pmu has a cpumask,
> > > and the user requested per-task events.
> >
On Wed, Sep 23, 2020 at 10:19:00PM +0200, Jiri Olsa wrote:
> On Wed, Sep 23, 2020 at 11:15:06PM +0900, Namhyung Kim wrote:
> > I think the problem is that armv8_pmu has a cpumask,
> > and the user requested per-task events.
> >
> > The code tried to open the event with a dummy cpu map
> > since
Hi Andi,
On 2020/9/23 3:50, Andi Kleen wrote:
> On Tue, Sep 22, 2020 at 12:23:21PM -0700, Andi Kleen wrote:
>>> After debugging, i found the root reason is that the xyarray fd is created
>>> by evsel__open_per_thread() ignoring the cpu passed in
>>> create_perf_stat_counter(), while the evsel'
On Wed, Sep 23, 2020 at 11:15:06PM +0900, Namhyung Kim wrote:
> On Wed, Sep 23, 2020 at 11:08 PM Jiri Olsa wrote:
> >
> > On Wed, Sep 23, 2020 at 10:49:52PM +0900, Namhyung Kim wrote:
> > > On Wed, Sep 23, 2020 at 2:44 PM Jiri Olsa wrote:
> > > >
> > > > On Tue, Sep 22, 2020 at 11:13:45AM +0800,
On Wed, Sep 23, 2020 at 11:08 PM Jiri Olsa wrote:
>
> On Wed, Sep 23, 2020 at 10:49:52PM +0900, Namhyung Kim wrote:
> > On Wed, Sep 23, 2020 at 2:44 PM Jiri Olsa wrote:
> > >
> > > On Tue, Sep 22, 2020 at 11:13:45AM +0800, Wei Li wrote:
> > > > When executing perf stat with armv8_pmu events with
On Wed, Sep 23, 2020 at 10:49:52PM +0900, Namhyung Kim wrote:
> On Wed, Sep 23, 2020 at 2:44 PM Jiri Olsa wrote:
> >
> > On Tue, Sep 22, 2020 at 11:13:45AM +0800, Wei Li wrote:
> > > When executing perf stat with armv8_pmu events with a workload, it will
> > > report a segfault as result.
> >
> >
On Wed, Sep 23, 2020 at 2:44 PM Jiri Olsa wrote:
>
> On Tue, Sep 22, 2020 at 11:13:45AM +0800, Wei Li wrote:
> > When executing perf stat with armv8_pmu events with a workload, it will
> > report a segfault as result.
>
> please share the perf stat command line you see that segfault for
It seems
On Tue, Sep 22, 2020 at 11:13:45AM +0800, Wei Li wrote:
> When executing perf stat with armv8_pmu events with a workload, it will
> report a segfault as result.
please share the perf stat command line you see that segfault for
thanks,
jirka
>
> (gdb) bt
> #0 0x00603fc8 in
On Tue, Sep 22, 2020 at 12:23:21PM -0700, Andi Kleen wrote:
> > After debugging, i found the root reason is that the xyarray fd is created
> > by evsel__open_per_thread() ignoring the cpu passed in
> > create_perf_stat_counter(), while the evsel' cpumap is assigned as the
> > corresponding PMU's
> After debugging, i found the root reason is that the xyarray fd is created
> by evsel__open_per_thread() ignoring the cpu passed in
> create_perf_stat_counter(), while the evsel' cpumap is assigned as the
> corresponding PMU's cpumap in __add_event(). Thus, the xyarray fd is created
> with ncpus
When executing perf stat with armv8_pmu events with a workload, it will
report a segfault as result.
(gdb) bt
#0 0x00603fc8 in perf_evsel__close_fd_cpu (evsel=,
cpu=) at evsel.c:122
#1 perf_evsel__close_cpu (evsel=evsel@entry=0x716e950, cpu=7) at evsel.c:156
#2 0x004d4718
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