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Mon, 14 Jul 2025 00:35:41 +0000 (UTC) Received: from h1.redhat.com (unknown [10.22.64.9]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E430030001B5; Mon, 14 Jul 2025 00:35:28 +0000 (UTC) From: Nico Pache To: linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: david@redhat.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, dev.jain@arm.com, corbet@lwn.net, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, akpm@linux-foundation.org, baohua@kernel.org, willy@infradead.org, peterx@redhat.com, wangkefeng.wang@huawei.com, usamaarif642@gmail.com, sunnanyong@huawei.com, vishal.moola@gmail.com, thomas.hellstrom@linux.intel.com, yang@os.amperecomputing.com, kirill.shutemov@linux.intel.com, aarcange@redhat.com, raquini@redhat.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, tiwai@suse.de, will@kernel.org, dave.hansen@linux.intel.com, jack@suse.cz, cl@gentwo.org, jglisse@google.com, surenb@google.com, zokeefe@google.com, hannes@cmpxchg.org, rientjes@google.com, mhocko@suse.com, rdunlap@infradead.org, hughd@google.com Subject: [PATCH v9 13/14] khugepaged: add per-order mTHP khugepaged stats Date: Sun, 13 Jul 2025 18:32:06 -0600 Message-ID: <20250714003207.113275-14-npache@redhat.com> In-Reply-To: <20250714003207.113275-1-npache@redhat.com> References: <20250714003207.113275-1-npache@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: AE84C100008 X-Stat-Signature: m4bdqsnaxfi13saonuw8sn6px3rhznp8 X-HE-Tag: 1752453351-941883 X-HE-Meta: U2FsdGVkX19+pw67KMK/iWpFFrEVsgxHQ4Ub5IRN18xKTBusO2+DiZW8P98Tj0c4yYuIXFd11ez0kZbRvYCaptkzsegceracCz7QJnLqGUXKUh0nG38UEyPzsDphLwAjRhXNMWGo8sTwgop9iABny4tA1F2BEsEt1m4Y1fO8qhLST3COF+nyLLauzsFscRUBWTfFtDliJfM+GT0qHyJwncc7xf8TPpVtjsGe8agdpOeHivYII1fiJTSQDx0E2VF7sK2qWMG24KB01pbdkHfneEzRLlQUc1eJ52X2jHz/FizJHrWvIngorIGhxIVHDgikjpm8k7gRcgrkhSnY7Pn9VbOvHv2mW68n0jfchUcfsmhXey8ORMkGN+dIElUmHjgGBRruA2/9YXaUcgT9ltdcCpRdWPEjBzU+17Mhq8e7B9zm4q7sfovQF/faUzqoml2bPFKKQbB/fpQji7bP2ZatuR2rOCqC1bQu97Zub0Y52/Tu6InVuwSd6T86GE+ZMT716K1gm2nH+UZwRe84smMRN5rCeNypbdMVv1SmVb1YcQp1h7KC7TRSxOM9DY2pWcFVoRKEBIkvGr+sV0kdG2pEalFtbP6u16tv84GH7j+R/Th3Bk6yF7MkMw6s3nQrAiuSwZZTPAp57sveBN5suTYjP5jgWkCniz17r7e+opLahJRhSA+RFYyf7oQESILm5UpVRjy02XQbzc63AsG+58XxvcAd4HeQ/Wnudk4ik3vagpSPE83QqXzpSINAIriOLwIsfVIoTFIh2VrPioMEzjnHek+ZkC5SoR3AsAKndlmyhxXFld6MxtiRrhceOmaum/FCXdH3bXeM90kLCFAodAlUL70cpVbPahfVP8kuMCEc084/lvlbGGKim0K40meA2sb9ityBKaEPAFL9ZCOYhnLFQVkVs/7jyRla4RkNNwDHPtk0/bWFbwPWW1i4HZBc+3TSFmfXjrnAPPt3hmeTk+4 8TAraTnU fWwQqEjtAgPFFO2thDJDs/c+lfq1Ovm0Nwh1e6r+rdN0+7d0ONVbggHHSkznHycoDhzMdg5Jk88DWeotV5Zh66i/fVLRdU7U6wOmDIEg+p7qIHv+VZ58nHeEUPiMVR1WqCAX9kSFyJLiw1Ry4buZA03WRCcDEZ8OHmsNqdnIdTn5Hf/U7mRzMx9n1TalXKqLfCBtgBGul2/NiWdOT47woecUdenuA5CvEBXFqeeb/EYM3n2N1kYrcOvxCWAh65SWsSNwGM6xsMtdKLVDmgZGw5T5r88M3U3Y7MHXujA+JLJezuePXGVwrJq1gVz2S5j7aAk/B0OTuyQqUBIHcBpoIPSbRDI/4sucIhk/JXEzgBUZJk3x7YZgUKVLepRArnc65+yreYORmY9XKUbdiFSYnLrgHCQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: With mTHP support inplace, let add the per-order mTHP stats for exceeding NONE, SWAP, and SHARED. Signed-off-by: Nico Pache --- Documentation/admin-guide/mm/transhuge.rst | 17 +++++++++++++++++ include/linux/huge_mm.h | 3 +++ mm/huge_memory.c | 7 +++++++ mm/khugepaged.c | 15 ++++++++++++--- 4 files changed, 39 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst index 2c523dce6bc7..28c8af61efba 100644 --- a/Documentation/admin-guide/mm/transhuge.rst +++ b/Documentation/admin-guide/mm/transhuge.rst @@ -658,6 +658,23 @@ nr_anon_partially_mapped an anonymous THP as "partially mapped" and count it here, even though it is not actually partially mapped anymore. +collapse_exceed_swap_pte + The number of anonymous THP which contain at least one swap PTE. + Currently khugepaged does not support collapsing mTHP regions that + contain a swap PTE. + +collapse_exceed_none_pte + The number of anonymous THP which have exceeded the none PTE threshold. + With mTHP collapse, a bitmap is used to gather the state of a PMD region + and is then recursively checked from largest to smallest order against + the scaled max_ptes_none count. This counter indicates that the next + enabled order will be checked. + +collapse_exceed_shared_pte + The number of anonymous THP which contain at least one shared PTE. + Currently khugepaged does not support collapsing mTHP regions that + contain a shared PTE. + 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 diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 4042078e8cc9..e0a27f80f390 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -141,6 +141,9 @@ enum mthp_stat_item { MTHP_STAT_SPLIT_DEFERRED, MTHP_STAT_NR_ANON, MTHP_STAT_NR_ANON_PARTIALLY_MAPPED, + MTHP_STAT_COLLAPSE_EXCEED_SWAP, + MTHP_STAT_COLLAPSE_EXCEED_NONE, + MTHP_STAT_COLLAPSE_EXCEED_SHARED, __MTHP_STAT_COUNT }; diff --git a/mm/huge_memory.c b/mm/huge_memory.c index e2ed9493df77..57e5699cf638 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -632,6 +632,10 @@ DEFINE_MTHP_STAT_ATTR(split_failed, MTHP_STAT_SPLIT_FAILED); DEFINE_MTHP_STAT_ATTR(split_deferred, MTHP_STAT_SPLIT_DEFERRED); DEFINE_MTHP_STAT_ATTR(nr_anon, MTHP_STAT_NR_ANON); DEFINE_MTHP_STAT_ATTR(nr_anon_partially_mapped, MTHP_STAT_NR_ANON_PARTIALLY_MAPPED); +DEFINE_MTHP_STAT_ATTR(collapse_exceed_swap_pte, MTHP_STAT_COLLAPSE_EXCEED_SWAP); +DEFINE_MTHP_STAT_ATTR(collapse_exceed_none_pte, MTHP_STAT_COLLAPSE_EXCEED_NONE); +DEFINE_MTHP_STAT_ATTR(collapse_exceed_shared_pte, MTHP_STAT_COLLAPSE_EXCEED_SHARED); + static struct attribute *anon_stats_attrs[] = { &anon_fault_alloc_attr.attr, @@ -648,6 +652,9 @@ static struct attribute *anon_stats_attrs[] = { &split_deferred_attr.attr, &nr_anon_attr.attr, &nr_anon_partially_mapped_attr.attr, + &collapse_exceed_swap_pte_attr.attr, + &collapse_exceed_none_pte_attr.attr, + &collapse_exceed_shared_pte_attr.attr, NULL, }; diff --git a/mm/khugepaged.c b/mm/khugepaged.c index d0c99b86b304..8a5873d0a23a 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -594,7 +594,10 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, continue; } else { result = SCAN_EXCEED_NONE_PTE; - count_vm_event(THP_SCAN_EXCEED_NONE_PTE); + if (order == HPAGE_PMD_ORDER) + count_vm_event(THP_SCAN_EXCEED_NONE_PTE); + else + count_mthp_stat(order, MTHP_STAT_COLLAPSE_EXCEED_NONE); goto out; } } @@ -623,8 +626,14 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, /* See khugepaged_scan_pmd(). */ if (folio_maybe_mapped_shared(folio)) { ++shared; - if (order != HPAGE_PMD_ORDER || (cc->is_khugepaged && - shared > khugepaged_max_ptes_shared)) { + if (order != HPAGE_PMD_ORDER) { + result = SCAN_EXCEED_SHARED_PTE; + count_mthp_stat(order, MTHP_STAT_COLLAPSE_EXCEED_SHARED); + goto out; + } + + if (cc->is_khugepaged && + shared > khugepaged_max_ptes_shared) { result = SCAN_EXCEED_SHARED_PTE; count_vm_event(THP_SCAN_EXCEED_SHARED_PTE); goto out; -- 2.50.0