linux-kernel - RE: [PATCH] swiotlb: Do not set total_used to 0 in swiotlb_create_debugfs

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Date: Fri, 29 Mar 2024 20:23:15 +0000
From: Dexuan Cui <decui@...rosoft.com>
To: Easwar Hariharan <eahariha@...ux.microsoft.com>, "hch@....de"
	<hch@....de>, "m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
	"robin.murphy@....com" <robin.murphy@....com>, "zhangpeng362@...wei.com"
	<zhangpeng362@...wei.com>, "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"mhklinux@...look.com" <mhklinux@...look.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH] swiotlb: Do not set total_used to 0 in
 swiotlb_create_debugfs_files()

> From: Easwar Hariharan <eahariha@...ux.microsoft.com>
> Sent: Friday, March 29, 2024 12:47 PM
> [...]
> Sorry, I'm missing a why in this commit message. Can you say what happens
> if the total_used and used_hiwater IS blindly set to 0? Is the only effect
> the change  in the readout of the swiotlb debugfs files?
> 
> Thanks,
> Easwar

Right, when the system is not doing any I/O, the readout may 
return a huge number while it should return 0. This is the only effect.

Thanks,
Dexuan