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Date: Tue, 16 Apr 2024 10:12:07 +0200
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Subject: Re: [PATCH v6 1/4] mm: add per-order mTHP anon_fault_alloc and
 anon_fault_fallback counters
To: Barry Song <21cnbao@gmail.com>, akpm@linux-foundation.org,
 linux-mm@kvack.org
Cc: cerasuolodomenico@gmail.com, chrisl@kernel.org, kasong@tencent.com,
 linux-kernel@vger.kernel.org, peterx@redhat.com, ryan.roberts@arm.com,
 surenb@google.com, v-songbaohua@oppo.com, willy@infradead.org,
 yosryahmed@google.com, yuzhao@google.com, corbet@lwn.net
References: <20240412114858.407208-1-21cnbao@gmail.com>
 <20240412114858.407208-2-21cnbao@gmail.com>
From: David Hildenbrand <david@redhat.com>
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On 12.04.24 13:48, Barry Song wrote:
> From: Barry Song <v-songbaohua@oppo.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@oppo.com>
> Cc: Chris Li <chrisl@kernel.org>
> Cc: David Hildenbrand <david@redhat.com>
> Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
> Cc: Kairui Song <kasong@tencent.com>
> Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
> Cc: Peter Xu <peterx@redhat.com>
> Cc: Ryan Roberts <ryan.roberts@arm.com>
> Cc: Suren Baghdasaryan <surenb@google.com>
> Cc: Yosry Ahmed <yosryahmed@google.com>
> Cc: Yu Zhao <yuzhao@google.com>
> ---

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

-- 
Cheers,

David / dhildenb