linux-kernel - Re: [patch 5/7] dma-pool: add pool sizes to debugfs

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Date:   Fri, 17 Apr 2020 09:10:23 +0200
From:   Christoph Hellwig <hch@....de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     David Rientjes <rientjes@...gle.com>,
        Christoph Hellwig <hch@....de>,
        Brijesh Singh <brijesh.singh@....com>,
        Jon Grimm <jon.grimm@....com>, Joerg Roedel <joro@...tes.org>,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org
Subject: Re: [patch 5/7] dma-pool: add pool sizes to debugfs

On Wed, Apr 15, 2020 at 08:45:08AM -0500, Tom Lendacky wrote:
>
>
> On 4/14/20 7:04 PM, David Rientjes wrote:
>> The atomic DMA pools can dynamically expand based on non-blocking
>> allocations that need to use it.
>>
>> Export the sizes of each of these pools, in bytes, through debugfs for
>> measurement.
>>
>> Suggested-by: Christoph Hellwig <hch@....de>
>> Signed-off-by: David Rientjes <rientjes@...gle.com>
>> ---
>>   kernel/dma/pool.c | 41 +++++++++++++++++++++++++++++++++++++++++
>>   1 file changed, 41 insertions(+)
>>
>> diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
>> index cf052314d9e4..3e22022c933b 100644
>> --- a/kernel/dma/pool.c
>> +++ b/kernel/dma/pool.c
>> @@ -2,6 +2,7 @@
>>   /*
>>    * Copyright (C) 2020 Google LLC
>>    */
>> +#include <linux/debugfs.h>
>>   #include <linux/dma-direct.h>
>>   #include <linux/dma-noncoherent.h>
>>   #include <linux/dma-contiguous.h>
>> @@ -15,6 +16,11 @@
>>   static struct gen_pool *atomic_pool_dma __ro_after_init;
>>   static struct gen_pool *atomic_pool_dma32 __ro_after_init;
>>   static struct gen_pool *atomic_pool_kernel __ro_after_init;
>> +#ifdef CONFIG_DEBUG_FS
>
> I don't think you need the #ifdef any more unless you just want to save 
> space. All of the debugfs routines have versions for whether 
> CONFIG_DEBUG_FS is defined or not.

Agreed.  I can fix this up.