linux-kernel - Re: [PATCH v2 1/2] swiotlb: add debugfs to track swiotlb buffer usage

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Message-ID: <98fdfb0c-0207-9a0a-4875-b834cfd1b2c3@oracle.com>
Date:   Fri, 4 Jan 2019 09:34:33 +0800
From:   Dongli Zhang <dongli.zhang@...cle.com>
To:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        konrad.wilk@...cle.com
Cc:     Joe Jin <joe.jin@...cle.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>, hch@....de,
        m.szyprowski@...sung.com, robin.murphy@....com
Subject: Re: [PATCH v2 1/2] swiotlb: add debugfs to track swiotlb buffer usage

Hi Konrad,

Would you please take a look on those two patches?

In addition, there is another patch correcting an error in comment.

https://lkml.org/lkml/2018/12/5/1721

Thank you very much!

Dongli Zhang

On 12/11/2018 05:05 AM, Joe Jin wrote:
> On 12/10/18 12:00 PM, Tim Chen wrote:
>>> @@ -528,6 +538,9 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
>>>  		dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size);
>>>  	return SWIOTLB_MAP_ERROR;
>>>  found:
>>> +#ifdef CONFIG_DEBUG_FS
>>> +	io_tlb_used += nslots;
>>> +#endif
>> One nit I have about this patch is there are too many CONFIG_DEBUG_FS.
>>
>> For example here, instead of io_tlb_used, we can have a macro defined,
>> perhaps something like inc_iotlb_used(nslots).  It can be placed in the
>> same section that swiotlb_create_debugfs is defined so there's a single
>> place where all the CONFIG_DEBUG_FS stuff is located.
>>
>> Then define inc_iotlb_used to be null when we don't have
>> CONFIG_DEBUG_FS.
>>
> 
> Dongli had removed above ifdef/endif on his next patch, "[PATCH v2 2/2]
> swiotlb: checking whether swiotlb buffer is full with io_tlb_used"
> 
> Thanks,
> Joe
>