linux-kernel - Re: [PATCH v6 0/4] mm: add per-order mTHP alloc and swpout counters

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Date: Fri, 12 Apr 2024 14:54:10 +0200
From: David Hildenbrand <david@...hat.com>
To: Barry Song <21cnbao@...il.com>, akpm@...ux-foundation.org,
 linux-mm@...ck.org
Cc: cerasuolodomenico@...il.com, chrisl@...nel.org, kasong@...cent.com,
 linux-kernel@...r.kernel.org, peterx@...hat.com, ryan.roberts@....com,
 surenb@...gle.com, v-songbaohua@...o.com, willy@...radead.org,
 yosryahmed@...gle.com, yuzhao@...gle.com, corbet@....net
Subject: Re: [PATCH v6 0/4] mm: add per-order mTHP alloc and swpout counters

On 12.04.24 13:48, Barry Song wrote:
> From: Barry Song <v-songbaohua@...o.com>
> 
> The patchset introduces a framework to facilitate mTHP counters, starting
> with the allocation and swap-out counters. Currently, only four new nodes
> are appended to the stats directory for each mTHP size.
> 
> /sys/kernel/mm/transparent_hugepage/hugepages-<size>/stats
> 	anon_fault_alloc
> 	anon_fault_fallback
> 	anon_fault_fallback_charge
> 	anon_swpout
> 	anon_swpout_fallback
> 
> These nodes are crucial for us to monitor the fragmentation levels of
> both the buddy system and the swap partitions. In the future, we may
> consider adding additional nodes for further insights.
> 
> -v6:
>    * collect reviewed-by tags for patch2/4, 3/4, 4/4, Ryan;
>    * move back to static array by using MAX_PTRS_PER_PTE, Ryan;
>    * move to for_each_possible_cpu to handle cpu hotplug, Ryan;
>    * other minor cleanups according to Ryan;

Please *really* not multiple versions of the same patch set on one a 
single day.

-- 
Cheers,

David / dhildenb