netdev - Re: [PATCH 08/16] iommu/fsl: use page allocation function provided by iommu-pages.h

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Wed, 29 Nov 2023 16:03:05 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: Robin Murphy <robin.murphy@....com>, akpm@...ux-foundation.org,
	alex.williamson@...hat.com, alim.akhtar@...sung.com,
	alyssa@...enzweig.io, asahi@...ts.linux.dev,
	baolu.lu@...ux.intel.com, bhelgaas@...gle.com,
	cgroups@...r.kernel.org, corbet@....net, david@...hat.com,
	dwmw2@...radead.org, hannes@...xchg.org, heiko@...ech.de,
	iommu@...ts.linux.dev, jasowang@...hat.com,
	jernej.skrabec@...il.com, jonathanh@...dia.com, joro@...tes.org,
	kevin.tian@...el.com, krzysztof.kozlowski@...aro.org,
	kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-rockchip@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-sunxi@...ts.linux.dev,
	linux-tegra@...r.kernel.org, lizefan.x@...edance.com,
	marcan@...can.st, mhiramat@...nel.org, mst@...hat.com,
	m.szyprowski@...sung.com, netdev@...r.kernel.org,
	paulmck@...nel.org, rdunlap@...radead.org, samuel@...lland.org,
	suravee.suthikulpanit@....com, sven@...npeter.dev,
	thierry.reding@...il.com, tj@...nel.org, tomas.mudrunka@...il.com,
	vdumpa@...dia.com, virtualization@...ts.linux.dev, wens@...e.org,
	will@...nel.org, yu-cheng.yu@...el.com
Subject: Re: [PATCH 08/16] iommu/fsl: use page allocation function provided
 by iommu-pages.h

On Wed, Nov 29, 2023 at 02:45:03PM -0500, Pasha Tatashin wrote:

> > same kind of big systems where IOMMU pagetables would be of any concern.
> > I believe some of the some of the "serious" NICs can easily run up
> > hundreds of megabytes if not gigabytes worth of queues, SKB pools, etc.
> > - would you propose accounting those too?
> 
> Yes. Any kind of kernel memory that is proportional to the workload
> should be accountable. Someone is using those resources compared to
> the idling system, and that someone should be charged.

There is a difference between charged and accounted

You should be running around adding GFP_KERNEL_ACCOUNT, yes. I already
did a bunch of that work. Split that out from this series and send it
to the right maintainers.

Adding a counter for allocations and showing in procfs is a very
different question. IMHO that should not be done in micro, the
threshold to add a new counter should be high.

There is definately room for a generic debugging feature to break down
GFP_KERNEL_ACCOUNT by owernship somehow. Maybe it can already be done
with BPF. IDK

Jason