linux-kernel - Re: [PATCH 0/4] Improve PTT filter interface and some fixes

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Message-ID: <d496ee4f-641a-a726-ab3f-62b587422b61@huawei.com>
Date:   Mon, 27 Mar 2023 18:49:54 +0800
From:   Yicong Yang <yangyicong@...wei.com>
To:     <mathieu.poirier@...aro.org>, <suzuki.poulose@....com>,
        <jonathan.cameron@...wei.com>, <corbet@....net>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>
CC:     <yangyicong@...ilicon.com>, <alexander.shishkin@...ux.intel.com>,
        <helgaas@...nel.org>, <linux-pci@...r.kernel.org>,
        <prime.zeng@...wei.com>, <linuxarm@...wei.com>
Subject: Re: [PATCH 0/4] Improve PTT filter interface and some fixes

A gentle ping...

Thanks.

On 2023/3/15 17:43, Yicong Yang wrote:
> From: Yicong Yang <yangyicong@...ilicon.com>
> 
> This series tends to improve the PTT's filter interface in 2 aspects (Patch 2&3):
> - Support dynamically filter updating to response to hotplug
>   Previous the supported filter list is settled down once the driver probed and
>   it maybe out-of-date if hotplug events happen later. User need to reload the
>   driver to update list. Patch 1/2 enable the driver to update the list by
>   registering a PCI bus notifier and the filter list will always be the latest.
> - Export the available filters through sysfs
>   Previous user needs to calculate the filters and filter value using device's
>   BDF number, which requires the user to know the hardware well. Patch 3/3 tends
>   to export the available filter information through sysfs attributes, the filter
>   value will be gotten by reading the file. This will be more user friendly.
> 
> Also includes a fix and an improve. Patch 1 tends to only export the online CPUs
> supported by the PTT, this will make perf work properly when there's offline CPUs
> within the node PTT locates. Patch 4 tends to set proper PMU capability to avoid
> collecting unnecessary data to save the storage.
> 
> Yicong Yang (4):
>   hwtracing: hisi_ptt: Make cpumask only present online CPUs
>   hwtracing: hisi_ptt: Add support for dynamically updating the filter
>     list
>   hwtracing: hisi_ptt: Export available filters through sysfs
>   hwtracing: hisi_ptt: Advertise PERF_PMU_CAP_NO_EXCLUDE for PTT PMU
> 
>  .../ABI/testing/sysfs-devices-hisi_ptt        |  50 +++
>  Documentation/trace/hisi-ptt.rst              |  12 +-
>  drivers/hwtracing/ptt/hisi_ptt.c              | 396 +++++++++++++++++-
>  drivers/hwtracing/ptt/hisi_ptt.h              |  51 +++
>  4 files changed, 498 insertions(+), 11 deletions(-)
>