From: David Rientjes via iommu <iommu@lists.linux-foundation.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>,
Hillf Danton <hdanton@sina.com>,
"Singh, Brijesh" <brijesh.singh@amd.com>,
"Grimm, Jon" <jon.grimm@amd.com>,
linux <linux-kernel@vger.kernel.org>,
iommu <iommu@lists.linux-foundation.org>
Subject: Re: [rfc v2 3/6] dma-pool: dynamically expanding atomic pools
Date: Tue, 14 Apr 2020 12:23:29 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.22.394.2004141222260.2583@chino.kir.corp.google.com> (raw)
In-Reply-To: <20200414064441.GC23359@lst.de>
On Tue, 14 Apr 2020, Christoph Hellwig wrote:
> > I'll rely on Christoph to determine whether it makes sense to add some
> > periodic scavening of the atomic pools, whether that's needed for this to
> > be merged, or wheter we should enforce some maximum pool size.
>
> I don't really see the point. In fact the only part of the series
> I feel uneasy about is the growing of the pools, because it already
> adds a fair amount of complexity that we might not need for simple
> things, but shrinking really doesn't make any sense. So I'm tempted
> to not ever support shrinking, and even make growing optional code under
> a new config variable. We'll also need a way to query the current size
> through e.g. a debugfs file.
>
New debugfs file sounds good, I'll add it. If we want to disable dynamic
expansion when the pool is depleted under a new config option, let me
know.
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prev parent reply other threads:[~2020-04-14 19:23 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-01 1:54 [rfc] dma-mapping: preallocate unencrypted DMA atomic pool David Rientjes via iommu
2020-01-06 17:34 ` Robin Murphy
2020-01-07 10:54 ` Christoph Hellwig
2020-01-07 19:57 ` David Rientjes via iommu
2020-01-09 14:31 ` Christoph Hellwig
2020-01-09 18:58 ` David Rientjes via iommu
2020-01-17 15:28 ` Tom Lendacky
2020-02-28 9:27 ` David Rientjes via iommu
2020-03-02 0:05 ` [rfc 0/6] unencrypted atomic DMA pools with dynamic expansion David Rientjes via iommu
2020-03-02 0:05 ` [rfc 1/6] dma-mapping: pass device to atomic allocation functions David Rientjes via iommu
2020-03-02 0:05 ` [rfc 2/6] dma-remap: add additional atomic pools to map to gfp mask David Rientjes via iommu
2020-03-05 15:42 ` Christoph Hellwig
2020-03-02 0:05 ` [rfc 3/6] dma-remap: wire up the atomic pools depending on " David Rientjes via iommu
2020-03-05 15:43 ` Christoph Hellwig
2020-03-02 0:05 ` [rfc 4/6] dma-remap: dynamically expanding atomic pools David Rientjes via iommu
2020-03-03 22:29 ` David Rientjes via iommu
2020-03-02 0:05 ` [rfc 5/6] dma-direct: atomic allocations must come from unencrypted pools David Rientjes via iommu
2020-03-05 15:44 ` Christoph Hellwig
2020-03-07 0:36 ` David Rientjes via iommu
2020-03-10 18:47 ` Christoph Hellwig
2020-03-02 0:05 ` [rfc 6/6] dma-remap: double the default DMA coherent pool size David Rientjes via iommu
2020-03-05 15:45 ` Christoph Hellwig
2020-04-08 21:21 ` [rfc v2 0/6] unencrypted atomic DMA pools with dynamic expansion David Rientjes via iommu
2020-04-08 21:21 ` [rfc v2 1/6] dma-remap: separate DMA atomic pools from direct remap code David Rientjes via iommu
2020-04-14 6:35 ` Christoph Hellwig
2020-04-08 21:21 ` [rfc v2 2/6] dma-pool: add additional coherent pools to map to gfp mask David Rientjes via iommu
2020-04-08 21:21 ` [rfc v2 3/6] dma-pool: dynamically expanding atomic pools David Rientjes via iommu
2020-04-08 21:21 ` [rfc v2 4/6] dma-direct: atomic allocations must come from atomic coherent pools David Rientjes via iommu
2020-04-09 21:24 ` Tom Lendacky
2020-04-14 19:18 ` David Rientjes via iommu
2020-04-14 6:43 ` Christoph Hellwig
2020-04-14 19:20 ` David Rientjes via iommu
2020-04-08 21:21 ` [rfc v2 5/6] x86/mm: unencrypted non-blocking DMA allocations use " David Rientjes via iommu
2020-04-08 21:21 ` [rfc v2 6/6] dma-pool: scale the default DMA coherent pool size with memory capacity David Rientjes via iommu
2020-04-10 14:55 ` [rfc v2 3/6] dma-pool: dynamically expanding atomic pools Hillf Danton
2020-04-10 19:37 ` David Rientjes via iommu
2020-04-14 6:44 ` Christoph Hellwig
2020-04-14 19:23 ` David Rientjes via iommu [this message]
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