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RE: [PATCH] Change AllocatePage to use ExAllocatePoolWithTag
- To: "paul@xxxxxxx" <paul@xxxxxxx>, "win-pv-devel@xxxxxxxxxxxxxxxxxxxx" <win-pv-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Martin Harvey <martin.harvey@xxxxxxxxxx>
- Date: Tue, 13 Jul 2021 08:57:53 +0000
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- Thread-topic: [PATCH] Change AllocatePage to use ExAllocatePoolWithTag
As I understand it, it is fixed. We've had some helpful side-effects with
respect to the change in that it's easier to keep track of xenbus cache memory
allocation and such like. Under very high load, the have been some bizzare
lockups where the Mm call takes ages to complete. Allocating from pool has
slightly ameliorated this (pool calls just fail), but on the other hand,
running the machine low on pool exposes bugs in third party drivers.
MH.
-----Original Message-----
From: win-pv-devel <win-pv-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf Of
Paul Durrant
Sent: 12 July 2021 20:10
To: win-pv-devel@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH] Change AllocatePage to use ExAllocatePoolWithTag
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On 07/07/2021 09:54, Martin Harvey wrote:
> From: Owen Smith <owen.smith@xxxxxxxxxx>
>
> Windows appears to have an edge case bug in which zeroing memory using
> MmAllocatePAgesForMdlEx (which in Win 10 1803 happens even if you
> specify MM_DONT_ZERO_ALLOCATION) can cause a BSOD 139 1e.
It is my understanding that this bug was fixed. Is this not the case?
Paul
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