RE: [PATCH v2] mm: Proactive compaction

[Nitin Gupta]

> -----Original Message-----
> From: Nitin Gupta <nigupta@xxxxxxxxxx>
> Sent: Monday, March 2, 2020 1:34 PM
> To: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>; Michal Hocko
> <mhocko@xxxxxxxx>; Vlastimil Babka <vbabka@xxxxxxx>
> Cc: Nitin Gupta <nigupta@xxxxxxxxxx>; Matthew Wilcox
> <willy@xxxxxxxxxxxxx>; Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>;
> Mike Kravetz <mike.kravetz@xxxxxxxxxx>; linux-kernel <linux-
> kernel@xxxxxxxxxxxxxxx>; linux-mm <linux-mm@xxxxxxxxx>
> Subject: [PATCH v2] mm: Proactive compaction
> 


> - With 5.6.0-rc3 + this patch, with proactiveness=20
> 
> echo 20 | sudo tee /sys/kernel/mm/compaction/node-*/proactiveness
> 
>   percentile latency
>   ââââââââââ âââââââ
> 	   5       2
> 	  10       2
> 	  25       3
> 	  30       3
> 	  40       3
> 	  50       4
> 	  60       4
> 	  75       4
> 	  80       4
> 	  90       5
> 	  95     429
> 

The percentile latency data above is correct but the summary line is
Incorrect:

> Total 2M hugepages allocated = 11120 (21.7G worth of hugepages out of 25G
> total free => 98% of free memory could be allocated as hugepages)
>

Corrected:
Total 2M hugepages allocated = 384105 (750G worth of hugepages out of
762G total free => 98% of free memory could be allocated as hugepages)

Thanks,
Nitin