linux-kernel - Re: [PATCH v6 1/4] mm: add per-order mTHP anon_fault_alloc and anon_fault

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Date: Tue, 16 Apr 2024 10:12:07 +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 1/4] mm: add per-order mTHP anon_fault_alloc and
 anon_fault_fallback counters

On 12.04.24 13:48, Barry Song wrote:
> From: Barry Song <v-songbaohua@...o.com>
> 
> Profiling a system blindly with mTHP has become challenging due to the
> lack of visibility into its operations.  Presenting the success rate of
> mTHP allocations appears to be pressing need.
> 
> Recently, I've been experiencing significant difficulty debugging
> performance improvements and regressions without these figures.  It's
> crucial for us to understand the true effectiveness of mTHP in real-world
> scenarios, especially in systems with fragmented memory.
> 
> This patch establishes the framework for per-order mTHP
> counters. It begins by introducing the anon_fault_alloc and
> anon_fault_fallback counters. Additionally, to maintain consistency
> with thp_fault_fallback_charge in /proc/vmstat, this patch also tracks
> anon_fault_fallback_charge when mem_cgroup_charge fails for mTHP.
> Incorporating additional counters should now be straightforward as well.
> 
> Signed-off-by: Barry Song <v-songbaohua@...o.com>
> Cc: Chris Li <chrisl@...nel.org>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Domenico Cerasuolo <cerasuolodomenico@...il.com>
> Cc: Kairui Song <kasong@...cent.com>
> Cc: Matthew Wilcox (Oracle) <willy@...radead.org>
> Cc: Peter Xu <peterx@...hat.com>
> Cc: Ryan Roberts <ryan.roberts@....com>
> Cc: Suren Baghdasaryan <surenb@...gle.com>
> Cc: Yosry Ahmed <yosryahmed@...gle.com>
> Cc: Yu Zhao <yuzhao@...gle.com>
> ---

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb