Re: lot of MemAvailable but falling cache and raising PSI

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 10/22/19 9:41 AM, Stefan Priebe - Profihost AG wrote:
>> Hi, could you try the patch below? I suspect you're hitting a corner
>> case where compaction_suitable() returns COMPACT_SKIPPED for the
>> ZONE_DMA, triggering reclaim even if other zones have plenty of free
>> memory. And should_continue_reclaim() then returns true until twice the
>> requested page size is reclaimed (compact_gap()). That means 4MB
>> reclaimed for each THP allocation attempt, which roughly matches the
>> trace data you preovided previously.
>>
>> The amplification to 4MB should be removed in patches merged for 5.4, so
>> it would be only 32 pages reclaimed per THP allocation. The patch below
>> tries to remove this corner case completely, and it should be more
>> visible on your 5.2.x, so please apply it there.
>>
> is there any reason to not apply that one on top of 4.19?
> 
> Greets,
> Stefan
> 

It should work, cherrypicks fine without conflict here.



[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [eCos]     [Asterisk Internet PBX]     [Linux API]     [Monitors]

  Powered by Linux