On Wed, Dec 15, 2021 at 08:27:10AM +0100, Christoph Hellwig wrote:
> On Wed, Dec 15, 2021 at 07:03:35AM +, Hyeonggon Yoo wrote:
> > I'm not sure that allocating from ZONE_DMA32 instead of ZONE_DMA
> > for kdump kernel is nice way to solve this problem.
>
> What is the problem with zones in kdu
On Wed, Dec 22, 2021 at 12:37:03PM +, Hyeonggon Yoo wrote:
> Oh I misunderstood this. Underlying physical address of vmalloc()-allocated
> memory
> can be mapped using DMA API, and it needs to be setup as scatterlist because
> the allocated memory is not physically continuous. Right?
Yes.
>
Hello Christoph.
On Tue, Dec 21, 2021 at 09:56:23AM +0100, Christoph Hellwig wrote:
> On Fri, Dec 17, 2021 at 11:38:27AM +, Hyeonggon Yoo wrote:
> > My understanding is any buffer requested from kmalloc (without
> > GFP_DMA/DMA32) can be used by device driver because it allocates
> > continuou
On Fri, Dec 17, 2021 at 11:38:27AM +, Hyeonggon Yoo wrote:
> My understanding is any buffer requested from kmalloc (without
> GFP_DMA/DMA32) can be used by device driver because it allocates
> continuous physical memory. It doesn't mean that buffer allocated
> with kmalloc is free of addressing
On 12/17/21 at 11:38am, Hyeonggon Yoo wrote:
> On Wed, Dec 15, 2021 at 08:27:10AM +0100, Christoph Hellwig wrote:
> > On Wed, Dec 15, 2021 at 07:03:35AM +, Hyeonggon Yoo wrote:
> > > I'm not sure that allocating from ZONE_DMA32 instead of ZONE_DMA
> > > for kdump kernel is nice way to solve thi
On Wed, Dec 15, 2021 at 08:27:10AM +0100, Christoph Hellwig wrote:
> On Wed, Dec 15, 2021 at 07:03:35AM +, Hyeonggon Yoo wrote:
> > I'm not sure that allocating from ZONE_DMA32 instead of ZONE_DMA
> > for kdump kernel is nice way to solve this problem.
>
> What is the problem with zones in kdu
On Tue, Dec 14, 2021 at 01:32:53PM +0800, Baoquan He wrote:
> On 12/13/21 at 01:43pm, Hyeonggon Yoo wrote:
> > Hello Baoquan. I have a question on your code.
> >
> > On Mon, Dec 13, 2021 at 08:27:12PM +0800, Baoquan He wrote:
> > > Dma-kmalloc will be created as long as CONFIG_ZONE_DMA is enabled.
On 12/15/21 at 07:03am, Hyeonggon Yoo wrote:
> On Wed, Dec 15, 2021 at 04:48:26AM +, Hyeonggon Yoo wrote:
> >
> > Hello Baoquan and Vlastimil.
> >
> > I'm not sure allowing ZONE_DMA32 for kdump kernel is nice way to solve
> > this problem. Devices that requires ZONE_DMA is rare but we still
>
On 12/15/21 at 11:34am, Vlastimil Babka wrote:
> On 12/15/21 08:27, Christoph Hellwig wrote:
> > On Wed, Dec 15, 2021 at 07:03:35AM +, Hyeonggon Yoo wrote:
> >> I'm not sure that allocating from ZONE_DMA32 instead of ZONE_DMA
> >> for kdump kernel is nice way to solve this problem.
> >
> > Wha
From: Vlastimil Babka
> Sent: 15 December 2021 10:34
>
> On 12/15/21 08:27, Christoph Hellwig wrote:
> > On Wed, Dec 15, 2021 at 07:03:35AM +, Hyeonggon Yoo wrote:
> >> I'm not sure that allocating from ZONE_DMA32 instead of ZONE_DMA
> >> for kdump kernel is nice way to solve this problem.
> >
On 12/15/21 08:27, Christoph Hellwig wrote:
> On Wed, Dec 15, 2021 at 07:03:35AM +, Hyeonggon Yoo wrote:
>> I'm not sure that allocating from ZONE_DMA32 instead of ZONE_DMA
>> for kdump kernel is nice way to solve this problem.
>
> What is the problem with zones in kdump kernels?
My understan
On 12/14/21 at 11:09am, Vlastimil Babka wrote:
> On 12/14/21 06:32, Baoquan He wrote:
> > On 12/13/21 at 01:43pm, Hyeonggon Yoo wrote:
> >> Hello Baoquan. I have a question on your code.
> >>
> >> On Mon, Dec 13, 2021 at 08:27:12PM +0800, Baoquan He wrote:
> >> > Dma-kmalloc will be created as lon
On Tue, Dec 14, 2021 at 11:07:34AM -0600, john.p.donne...@oracle.com wrote:
> Is CONFIG_ZONE_DMA even needed anymore in x86_64 ?
Yes. There are still plenty of addressing challenged devices, mostly
ISA-like but also a few PCI/PCIe ones.
___
kexec mail
On Wed, Dec 15, 2021 at 07:03:35AM +, Hyeonggon Yoo wrote:
> I'm not sure that allocating from ZONE_DMA32 instead of ZONE_DMA
> for kdump kernel is nice way to solve this problem.
What is the problem with zones in kdump kernels?
> Devices that requires ZONE_DMA memory is rare but we still sup
On Wed, Dec 15, 2021 at 04:48:26AM +, Hyeonggon Yoo wrote:
>
> Hello Baoquan and Vlastimil.
>
> I'm not sure allowing ZONE_DMA32 for kdump kernel is nice way to solve
> this problem. Devices that requires ZONE_DMA is rare but we still
> support them.
>
> If we allow ZONE_DMA32 for ZONE_DMA i
On Tue, Dec 14, 2021 at 11:09:23AM +0100, Vlastimil Babka wrote:
> On 12/14/21 06:32, Baoquan He wrote:
> > On 12/13/21 at 01:43pm, Hyeonggon Yoo wrote:
> >> Hello Baoquan. I have a question on your code.
> >>
> >> On Mon, Dec 13, 2021 at 08:27:12PM +0800, Baoquan He wrote:
> >> > Dma-kmalloc will
On 12/14/21 10:31 AM, Christoph Hellwig wrote:
On Mon, Dec 13, 2021 at 08:27:12PM +0800, Baoquan He wrote:
Dma-kmalloc will be created as long as CONFIG_ZONE_DMA is enabled.
However, it will fail if DMA zone has no managed pages. The failure
can be seen in kdump kernel of x86_64 as below:
Plea
On Mon, Dec 13, 2021 at 08:27:12PM +0800, Baoquan He wrote:
> Dma-kmalloc will be created as long as CONFIG_ZONE_DMA is enabled.
> However, it will fail if DMA zone has no managed pages. The failure
> can be seen in kdump kernel of x86_64 as below:
Please just switch the sr allocation to use GFP_K
On Tue, 14 Dec 2021, Vlastimil Babka wrote:
> If doesn't feel right to me to fix (or rather workaround) this on the level
> of kmalloc caches just because the current reports come from there. If we
> decide it's acceptable for kdump kernel to return !ZONE_DMA memory for
> GFP_DMA requests, then it
On 12/14/21 06:32, Baoquan He wrote:
> On 12/13/21 at 01:43pm, Hyeonggon Yoo wrote:
>> Hello Baoquan. I have a question on your code.
>>
>> On Mon, Dec 13, 2021 at 08:27:12PM +0800, Baoquan He wrote:
>> > Dma-kmalloc will be created as long as CONFIG_ZONE_DMA is enabled.
>> > However, it will fail
On 12/13/21 at 01:43pm, Hyeonggon Yoo wrote:
> Hello Baoquan. I have a question on your code.
>
> On Mon, Dec 13, 2021 at 08:27:12PM +0800, Baoquan He wrote:
> > Dma-kmalloc will be created as long as CONFIG_ZONE_DMA is enabled.
> > However, it will fail if DMA zone has no managed pages. The failu
On 12/13/21 6:27 AM, Baoquan He wrote:
Dma-kmalloc will be created as long as CONFIG_ZONE_DMA is enabled.
However, it will fail if DMA zone has no managed pages. The failure
can be seen in kdump kernel of x86_64 as below:
CPU: 0 PID: 65 Comm: kworker/u2:1 Not tainted 5.14.0-rc2+ #9
Hardware
Hello Baoquan. I have a question on your code.
On Mon, Dec 13, 2021 at 08:27:12PM +0800, Baoquan He wrote:
> Dma-kmalloc will be created as long as CONFIG_ZONE_DMA is enabled.
> However, it will fail if DMA zone has no managed pages. The failure
> can be seen in kdump kernel of x86_64 as below:
>
Dma-kmalloc will be created as long as CONFIG_ZONE_DMA is enabled.
However, it will fail if DMA zone has no managed pages. The failure
can be seen in kdump kernel of x86_64 as below:
CPU: 0 PID: 65 Comm: kworker/u2:1 Not tainted 5.14.0-rc2+ #9
Hardware name: Intel Corporation SandyBridge Platfor
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