Messages in this thread | | | Subject | Re: [PATCH] fpga: dfl: fme: Fix cpu hotplug issue in performance reporting | From | kajoljain <> | Date | Tue, 29 Jun 2021 12:45:20 +0530 |
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On 6/28/21 3:47 PM, Kajol Jain wrote: > The performance reporting driver added cpu hotplug > feature but it didn't add pmu migration call in cpu > offline function. > This can create an issue incase the current designated > cpu being used to collect fme pmu data got offline, > as based on current code we are not migrating fme pmu to > new target cpu. Because of that perf will still try to > fetch data from that offline cpu and hence we will not > get counter data. > > Patch fixed this issue by adding pmu_migrate_context call > in fme_perf_offline_cpu function. >
Adding stable@vger.kernel.org in cc list as suggested by Moritz Fischer.
Thanks, Kajol Jain
> Fixes: 724142f8c42a ("fpga: dfl: fme: add performance reporting support") > Tested-by: Xu Yilun <yilun.xu@intel.com> > Signed-off-by: Kajol Jain <kjain@linux.ibm.com> > --- > drivers/fpga/dfl-fme-perf.c | 4 ++++ > 1 file changed, 4 insertions(+) > > --- > Changelog: > - Remove RFC tag > - Did nits changes on subject and commit message as suggested by Xu Yilun > - Added Tested-by tag > - Link to rfc patch: https://lkml.org/lkml/2021/6/28/112 > --- > diff --git a/drivers/fpga/dfl-fme-perf.c b/drivers/fpga/dfl-fme-perf.c > index 4299145ef347..b9a54583e505 100644 > --- a/drivers/fpga/dfl-fme-perf.c > +++ b/drivers/fpga/dfl-fme-perf.c > @@ -953,6 +953,10 @@ static int fme_perf_offline_cpu(unsigned int cpu, struct hlist_node *node) > return 0; > > priv->cpu = target; > + > + /* Migrate fme_perf pmu events to the new target cpu */ > + perf_pmu_migrate_context(&priv->pmu, cpu, target); > + > return 0; > } > >
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