Hi,

I have been noticing this leak for a few weeks now. I typically update
to the latest snapshot every 10-14 days and Xorg memory usage grows
monotonically in the meantime. I was gathering some data for a report,
but thanks to this thread it's explained now. I look forward to testing
the fix. I also have the iris driver.

> 35MB of memory is too large to expose amap leakage, since most of the amaps
> are associated with single pages.  The X server does some very large 
> allocations,
> and thus SIZE will not show these very well.
>
> To see the problem, It is better to look at "UVM amap" in "vmstat -m"
>
>       UVM amap 32835  1690K   2636K 78644K 26812908    0      
> 16,32,64,128,256,512,1024,4096,8192
>
>                ^^^^ this number is way too big, it should be 500 to 2000 ish.

Thanks for this comment! Now I know what to look for. On my system
running for 3 days it is already over 32,000.

Regards,
Anindya

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