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Therefore, this commit introduces per-order mTHP split counters to monitor the frequency of mTHP splits. This will assist developers in better analyzing and optimizing system performance. /sys/kernel/mm/transparent_hugepage/hugepages-/stats split_page split_page_failed deferred_split_page Signed-off-by: Lance Yang --- include/linux/huge_mm.h | 3 +++ mm/huge_memory.c | 14 ++++++++++++-- 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 56c7ea73090b..7b9c6590e1f7 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -272,6 +272,9 @@ enum mthp_stat_item { MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE, MTHP_STAT_ANON_SWPOUT, MTHP_STAT_ANON_SWPOUT_FALLBACK, + MTHP_STAT_SPLIT_PAGE, + MTHP_STAT_SPLIT_PAGE_FAILED, + MTHP_STAT_DEFERRED_SPLIT_PAGE, __MTHP_STAT_COUNT }; =20 diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 055df5aac7c3..52db888e47a6 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -557,6 +557,9 @@ DEFINE_MTHP_STAT_ATTR(anon_fault_fallback, MTHP_STAT_AN= ON_FAULT_FALLBACK); DEFINE_MTHP_STAT_ATTR(anon_fault_fallback_charge, MTHP_STAT_ANON_FAULT_FAL= LBACK_CHARGE); DEFINE_MTHP_STAT_ATTR(anon_swpout, MTHP_STAT_ANON_SWPOUT); DEFINE_MTHP_STAT_ATTR(anon_swpout_fallback, MTHP_STAT_ANON_SWPOUT_FALLBACK= ); +DEFINE_MTHP_STAT_ATTR(split_page, MTHP_STAT_SPLIT_PAGE); +DEFINE_MTHP_STAT_ATTR(split_page_failed, MTHP_STAT_SPLIT_PAGE_FAILED); +DEFINE_MTHP_STAT_ATTR(deferred_split_page, MTHP_STAT_DEFERRED_SPLIT_PAGE); =20 static struct attribute *stats_attrs[] =3D { &anon_fault_alloc_attr.attr, @@ -564,6 +567,9 @@ static struct attribute *stats_attrs[] =3D { &anon_fault_fallback_charge_attr.attr, &anon_swpout_attr.attr, &anon_swpout_fallback_attr.attr, + &split_page_attr.attr, + &split_page_failed_attr.attr, + &deferred_split_page_attr.attr, NULL, }; =20 @@ -3083,7 +3089,7 @@ int split_huge_page_to_list_to_order(struct page *pag= e, struct list_head *list, XA_STATE_ORDER(xas, &folio->mapping->i_pages, folio->index, new_order); struct anon_vma *anon_vma =3D NULL; struct address_space *mapping =3D NULL; - bool is_thp =3D folio_test_pmd_mappable(folio); + int order =3D folio_order(folio); int extra_pins, ret; pgoff_t end; bool is_hzp; @@ -3262,8 +3268,10 @@ int split_huge_page_to_list_to_order(struct page *pa= ge, struct list_head *list, i_mmap_unlock_read(mapping); out: xas_destroy(&xas); - if (is_thp) + if (order >=3D HPAGE_PMD_ORDER) count_vm_event(!ret ? THP_SPLIT_PAGE : THP_SPLIT_PAGE_FAILED); + count_mthp_stat(order, !ret ? MTHP_STAT_SPLIT_PAGE : + MTHP_STAT_SPLIT_PAGE_FAILED); return ret; } =20 @@ -3327,6 +3335,8 @@ void deferred_split_folio(struct folio *folio) if (list_empty(&folio->_deferred_list)) { if (folio_test_pmd_mappable(folio)) count_vm_event(THP_DEFERRED_SPLIT_PAGE); + count_mthp_stat(folio_order(folio), + MTHP_STAT_DEFERRED_SPLIT_PAGE); list_add_tail(&folio->_deferred_list, &ds_queue->split_queue); ds_queue->split_queue_len++; #ifdef CONFIG_MEMCG --=20 2.33.1 From nobody Sat May 18 09:22:55 2024 Received: from mail-pl1-f177.google.com (mail-pl1-f177.google.com [209.85.214.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D702B15E1E2 for ; Wed, 24 Apr 2024 13:53:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713966782; cv=none; b=Pzg4458nzbvhazlN8LuQ8MIg2+BPWNawA9+cfFx72Jkboyqc9u83/FQ7F/0W86VPxovsreCKT2uXGovkOgiWLIVsYaeqqGbfcF02XQsTdqHHOrsrMcIN8l4fh+7TDpXdhSeuzo3N8RlsRr5ZW7191EkM+TMOHJCEhvV1fTOLnYY= ARC-Message-Signature: i=1; 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Wed, 24 Apr 2024 06:52:59 -0700 (PDT) From: Lance Yang To: akpm@linux-foundation.org Cc: 21cnbao@gmail.com, ryan.roberts@arm.com, david@redhat.com, baolin.wang@linux.alibaba.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Lance Yang Subject: [PATCH 2/2] mm: add docs for per-order mTHP split counters Date: Wed, 24 Apr 2024 21:51:48 +0800 Message-Id: <20240424135148.30422-3-ioworker0@gmail.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20240424135148.30422-1-ioworker0@gmail.com> References: <20240424135148.30422-1-ioworker0@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This commit introduces documentation for mTHP split counters in transhuge.rst. Signed-off-by: Lance Yang --- Documentation/admin-guide/mm/transhuge.rst | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/adm= in-guide/mm/transhuge.rst index f82300b9193f..35d574a531c8 100644 --- a/Documentation/admin-guide/mm/transhuge.rst +++ b/Documentation/admin-guide/mm/transhuge.rst @@ -475,6 +475,22 @@ anon_swpout_fallback Usually because failed to allocate some continuous swap space for the huge page. =20 +split_page + is incremented every time a huge page is split into base + pages. This can happen for a variety of reasons but a common + reason is that a huge page is old and is being reclaimed. + This action implies splitting all PMD/PTE mapped with the huge page. + +split_page_failed + is incremented if kernel fails to split huge + page. This can happen if the page was pinned by somebody. + +deferred_split_page + is incremented when a huge page is put onto split + queue. This happens when a huge page is partially unmapped and + splitting it would free up some memory. Pages on split queue are + going to be split under memory pressure. + As the system ages, allocating huge pages may be expensive as the system uses memory compaction to copy data around memory to free a huge page for use. There are some counters in ``/proc/vmstat`` to help --=20 2.33.1