linux-kernel - Re: 2.6.25-rc5-git5 KVM memory not freed

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Message-ID: <47E64B27.3060400@qumranet.com>
Date:	Sun, 23 Mar 2008 14:20:55 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Ioan Ionita <opslynx@...il.com>
CC:	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.25-rc5-git5 KVM memory not freed

Avi Kivity wrote:
> Ioan Ionita wrote:
>> Hi,
>>
>> I'm using KVM and the qemu kvm modified to run a windows guest. I'm
>> allocating 900 MB to the guest. Seems that when I terminate a qemu
>> process, the memory that was allocated to qemu is not freed:
>>
>>
>> Mem:       2058140    1739156     318984          0     226944     
>> 425140
>> -/+ buffers/cache:    1087072     971068
>> Swap:            0          0          0
>>
>> So I'm using 1GB of ram even though I've terminated qemu. If I attempt
>> to start qemu again, the machine locks up. No message in the logs.
>>
>> Command to start qemu:
>> /usr/local/kvm/bin/qemu-system-x86_64 b.data -no-acpi -m 900 -net nic
>> -net user -hdb temp.raw -usbdevice tablet
>>
>> uname -a
>> Linux ops-desktop 2.6.25-rc5-git5 #1 SMP PREEMPT Sat Mar 15 14:47:25
>> EET 2008 x86_64 GNU/Linux
>>
>>
>> Not sure whether this is a problem on the kernel side.  I don't
>> pretend to understand linux memory management. But it wasn't occurring
>> with older kernels. I'll attempt to bisect.
>>   
>
> I reproduced this and am investigating.
>
>

Attached patch ought to fix this.

-- 
error compiling committee.c: too many arguments to function


View attachment "fix-kvm-2.6.25-rc6-leak.patch" of type "text/x-patch" (464 bytes)