linux-kernel - Re: [PATCH v4 7/9] iommu/vt-d: Add trace events for domain map/unmap

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Date:   Wed, 5 Jun 2019 14:48:45 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     baolu.lu@...ux.intel.com, David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christoph Hellwig <hch@....de>, ashok.raj@...el.com,
        jacob.jun.pan@...el.com, alan.cox@...el.com, kevin.tian@...el.com,
        mika.westerberg@...ux.intel.com, Ingo Molnar <mingo@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        pengfei.xu@...el.com,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Jonathan Corbet <corbet@....net>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH v4 7/9] iommu/vt-d: Add trace events for domain map/unmap

Hi Steve,

On 6/4/19 5:01 PM, Steven Rostedt wrote:
> On Mon,  3 Jun 2019 09:16:18 +0800
> Lu Baolu <baolu.lu@...ux.intel.com> wrote:
> 
> 
>> +TRACE_EVENT(bounce_unmap_single,
>> +	TP_PROTO(struct device *dev, dma_addr_t dev_addr, size_t size),
>> +
>> +	TP_ARGS(dev, dev_addr, size),
>> +
>> +	TP_STRUCT__entry(
>> +		__string(dev_name, dev_name(dev))
>> +		__field(dma_addr_t, dev_addr)
>> +		__field(size_t,	size)
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__assign_str(dev_name, dev_name(dev));
>> +		__entry->dev_addr = dev_addr;
>> +		__entry->size = size;
>> +	),
>> +
>> +	TP_printk("dev=%s dev_addr=0x%llx size=%zu",
>> +		  __get_str(dev_name),
>> +		  (unsigned long long)__entry->dev_addr,
>> +		  __entry->size)
>> +);
>> +
>> +TRACE_EVENT(bounce_map_sg,
>> +	TP_PROTO(struct device *dev, unsigned int i, unsigned int nelems,
>> +		 dma_addr_t dev_addr, phys_addr_t phys_addr, size_t size),
>> +
>> +	TP_ARGS(dev, i, nelems, dev_addr, phys_addr, size),
>> +
>> +	TP_STRUCT__entry(
>> +		__string(dev_name, dev_name(dev))
>> +		__field(unsigned int, i)
>> +		__field(unsigned int, last)
>> +		__field(dma_addr_t, dev_addr)
>> +		__field(phys_addr_t, phys_addr)
>> +		__field(size_t,	size)
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__assign_str(dev_name, dev_name(dev));
>> +		__entry->i = i;
>> +		__entry->last = nelems - 1;
>> +		__entry->dev_addr = dev_addr;
>> +		__entry->phys_addr = phys_addr;
>> +		__entry->size = size;
>> +	),
>> +
>> +	TP_printk("dev=%s elem=%u/%u dev_addr=0x%llx phys_addr=0x%llx size=%zu",
>> +		  __get_str(dev_name), __entry->i, __entry->last,
>> +		  (unsigned long long)__entry->dev_addr,
>> +		  (unsigned long long)__entry->phys_addr,
>> +		  __entry->size)
>> +);
>> +
>> +TRACE_EVENT(bounce_unmap_sg,
>> +	TP_PROTO(struct device *dev, unsigned int i, unsigned int nelems,
>> +		 dma_addr_t dev_addr, phys_addr_t phys_addr, size_t size),
>> +
>> +	TP_ARGS(dev, i, nelems, dev_addr, phys_addr, size),
>> +
>> +	TP_STRUCT__entry(
>> +		__string(dev_name, dev_name(dev))
>> +		__field(unsigned int, i)
>> +		__field(unsigned int, last)
>> +		__field(dma_addr_t, dev_addr)
>> +		__field(phys_addr_t, phys_addr)
>> +		__field(size_t,	size)
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__assign_str(dev_name, dev_name(dev));
>> +		__entry->i = i;
>> +		__entry->last = nelems - 1;
>> +		__entry->dev_addr = dev_addr;
>> +		__entry->phys_addr = phys_addr;
>> +		__entry->size = size;
>> +	),
>> +
>> +	TP_printk("dev=%s elem=%u/%u dev_addr=0x%llx phys_addr=0x%llx size=%zu",
>> +		  __get_str(dev_name), __entry->i, __entry->last,
>> +		  (unsigned long long)__entry->dev_addr,
>> +		  (unsigned long long)__entry->phys_addr,
>> +		  __entry->size)
>> +);
> 
> These last two events look identical. Please use the
> DECLARE_EVENT_CLASS() to describe the event and then DEFINE_EVENT() for
> the two events.
> 
> Each TRACE_EVENT() can add up to 5k of data/text, where as a
> DEFINE_EVENT() just adds around 250 bytes.
> 
> (Note, a TRACE_EVENT() is defined as a
> DECLARE_EVENT_CLASS()/DEFINE_EVENT() pair)

Thanks for reviewing. I will rework this patch according to your
comments here.

> 
> -- Steve
> 

Best regards,
Baolu

> 
>> +#endif /* _TRACE_INTEL_IOMMU_H */
>> +
>> +/* This part must be outside protection */
>> +#include <trace/define_trace.h>
> 
>