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Date:   Fri, 12 Apr 2019 07:13:59 -0700
From:   Joe Jin <>
To:     Dongli Zhang <>,,
Subject: Re: [PATCH 1/1] swiotlb: save io_tlb_used to local variable before
 leaving critical section

I'm good to have this patch, which helps identify the cause of failure is
fragmentation or it really been used up.

On 4/12/19 4:38 AM, Dongli Zhang wrote:
> When swiotlb is full, the kernel would print io_tlb_used. However, the
> result might be inaccurate at that time because we have left the critical
> section protected by spinlock.
> Therefore, we backup the io_tlb_used into local variable before leaving
> critical section.
> Fixes: 83ca25948940 ("swiotlb: dump used and total slots when swiotlb buffer is full")
> Suggested-by: HÃ¥kon Bugge <>
> Signed-off-by: Dongli Zhang <>

Reviewed-by: Joe Jin <> 


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