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From: Tianyu Lan <ltykernel@gmail.com>
To: Haiyang Zhang <haiyangz@microsoft.com>,
	Michael Kelley <mikelley@microsoft.com>,
	KY Srinivasan <kys@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	"wei.liu@kernel.org" <wei.liu@kernel.org>,
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	Tianyu Lan <Tianyu.Lan@microsoft.com>,
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Cc: "iommu@lists.linux-foundation.org"
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Subject: Re: [PATCH V5 12/12] net: netvsc: Add Isolation VM support for netvsc driver
Date: Thu, 16 Sep 2021 21:56:11 +0800	[thread overview]
Message-ID: <31da994f-a032-dd40-a90e-bfdaf313d45d@gmail.com> (raw)
In-Reply-To: <MN2PR21MB12959F10240EC1BB2270B345CADB9@MN2PR21MB1295.namprd21.prod.outlook.com>

On 9/16/2021 12:46 AM, Haiyang Zhang wrote:
>>> +				memset(vmap_pages, 0,
>>> +				       sizeof(*vmap_pages) * vmap_page_index);
>>> +				vmap_page_index = 0;
>>> +
>>> +				for (j = 0; j < i; j++)
>>> +					__free_pages(pages[j], alloc_unit);
>>> +
>>> +				kfree(pages);
>>> +				alloc_unit = 1;
>> This is the case where a large enough contiguous physical memory chunk
>> could not be found.  But rather than dropping all the way down to single
>> pages, would it make sense to try something smaller, but not 1?  For
>> example, cut the alloc_unit in half and try again.  But I'm not sure of
>> all the implications.
> I had the same question. But probably gradually decrementing uses too much
> time?
> 

This version is to propose the solution. We may optimize this to try
smaller size until to single page if this is right direction.



  reply	other threads:[~2021-09-16 13:56 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-14 13:39 [PATCH V5 00/12] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 01/12] x86/hyperv: Initialize GHCB page in Isolation VM Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 02/12] x86/hyperv: Initialize shared memory boundary in the " Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 03/12] x86/hyperv: Add new hvcall guest address host visibility support Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 04/12] Drivers: hv: vmbus: Mark vmbus ring buffer visible to host in Isolation VM Tianyu Lan
2021-09-15 15:40   ` Michael Kelley
2021-09-14 13:39 ` [PATCH V5 05/12] x86/hyperv: Add Write/Read MSR registers via ghcb page Tianyu Lan
2021-09-15 15:41   ` Michael Kelley
2021-09-14 13:39 ` [PATCH V5 06/12] x86/hyperv: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 07/12] Drivers: hv: vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-09-15 15:41   ` Michael Kelley
2021-09-16 10:52     ` Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 08/12] Drivers: hv : vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 09/12] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-09-15 15:42   ` Michael Kelley
2021-09-16 10:57     ` Tianyu Lan
2021-09-14 13:39 ` [PATCH V5 10/12] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-09-15 15:43   ` Michael Kelley
2021-09-14 13:39 ` [PATCH V5 11/12] scsi: storvsc: Add Isolation VM support for storvsc driver Tianyu Lan
2021-09-15 15:43   ` Michael Kelley
2021-09-14 13:39 ` [PATCH V5 12/12] net: netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-09-14 15:49   ` Haiyang Zhang
2021-09-15 16:21   ` Michael Kelley
2021-09-15 16:46     ` Haiyang Zhang
2021-09-16 13:56       ` Tianyu Lan [this message]
2021-09-16 14:43     ` Tianyu Lan
2021-09-22 10:34     ` Tianyu Lan
2021-09-27 14:26       ` Tianyu Lan
2021-09-28  5:39         ` Christoph Hellwig
2021-09-28  9:23           ` Tianyu Lan
2021-09-30  5:48             ` Christoph Hellwig

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