[PATCH] drm/ttm: Downgrade pr_err to pr_debug for memory allocation failures

[Michel Dänzer]

On 02/11/17 06:37 PM, Christian König wrote:
> Am 02.11.2017 um 18:34 schrieb Michel Dänzer:
>> From: Michel Dänzer <michel.daenzer at amd.com>
>>
>> Memory allocation failure should generally be handled gracefully by
>> callers. In particular, with transparent hugepage support, attempts
>> to allocate huge pages can fail under memory pressure, but the callers
>> fall back to allocating individual pages instead. In that case, there
>> would be spurious
>>
>>   [TTM] Unable to get page %u
>>
>> error messages in dmesg.
>>
>> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
> 
> Reminds me that I wanted to better test this code path, so how did you
> triggered that?

1. Enable zswap by writing 1 to /sys/module/zswap/parameters/enabled

2. Create enough memory pressure that the system starts hitting swap.
   E.g. in my case I think a full LLVM build does the trick.
   /sys/kernel/debug/zswap/pool_total_size should contain a non-0 value
   now.

3. Run the piglit gpu profile.


> Anyway patch is Reviewed-by: Christian König <christian.koenig at amd.com>.

Thanks!


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer