[Intel-gfx] significant ioremap leak in i915?

[Breton M. Saunders]

On 12/10/14 11:23, Dave Airlie wrote:
> On 12 October 2014 19:28, Breton M. Saunders <brett at mynah-software.com> wrote:
>> Guys,
>>
>>    This might be covered elsewhere, but help me come up to speed:  I am
>> trying to analyze a leak in i915 that occurs on a digital sinage system that
>> I've built.  The system basically is doing a lot of XCompositeRedirectWindow
>> / glXBindTexImageEXT calls to render web views and mplayer output onto
>> opengl textures for subsequent rendering.
>>
>>    In my testing, I observe that an enormous block is being lost in ioremap
>> by looking at /proc/vmallocinfo:
>>
>> <snip>
>> 0xffffc90000200000-0xffffc90010201000 268439552 pci_mmcfg_arch_map+0x33/0x90
>> phys=e0000000 ioremap
>> <snip>
>> 0xffffc90010f80000-0xffffc90020f81000 268439552 i915_driver_load+0x20c/0x6d0
>> [i915] phys=c0000000 ioremap
>> <snip>
>>
>>    So in this example 268 megabytes have been lost.
>
> This isn't RAM, its address space mapping, its not really a leak at all.
It really doesn't matter whether it is ram or mapping; its a resource 
leak that causes the system to OOM and panic.

     -Brett