linux-kernel - Re: [PATCH] dma-debug: Make things less spammy under memory pressure

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Message-ID: <20220601051621.GA21535@lst.de>
Date:   Wed, 1 Jun 2022 07:16:21 +0200
From:   Christoph Hellwig <hch@....de>
To:     Rob Clark <robdclark@...il.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Rob Clark <robdclark@...omium.org>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "open list:DMA MAPPING HELPERS" <iommu@...ts.linux-foundation.org>
Subject: Re: [PATCH] dma-debug: Make things less spammy under memory
 pressure

On Tue, May 31, 2022 at 03:19:45PM -0700, Rob Clark wrote:
> um, quite..  tbf that was in the context of a WIP igt test for
> shrinker which was trying to cycle thru ~2x RAM size worth of GEM
> buffers on something like 72 threads.  So it could just be threads
> that had gotten past the dma_debug_disabled() check already before
> global_disable was set to true?
> 
> I guess this could be pr_err_once() instead, then?

Yes, we could use pr_err_once to reduce the chattyness while still
keeping global_disable to disable all the actual tracking.