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Fri, 23 Jan 2026 00:23:00 -0800 (PST) Received: from localhost.localdomain ([221.227.246.159]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c635a43f11csm1348363a12.35.2026.01.23.00.22.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Jan 2026 00:23:00 -0800 (PST) From: Vernon Yang To: akpm@linux-foundation.org, david@kernel.org Cc: lorenzo.stoakes@oracle.com, ziy@nvidia.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vernon Yang Subject: [PATCH mm-new v5 1/5] mm: khugepaged: add trace_mm_khugepaged_scan event Date: Fri, 23 Jan 2026 16:22:28 +0800 Message-ID: <20260123082232.16413-2-vernon2gm@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260123082232.16413-1-vernon2gm@gmail.com> References: <20260123082232.16413-1-vernon2gm@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: gtp56kc7dk5jbd6wkcjz8r3rkbgs5smr X-Rspamd-Queue-Id: E12DF2000B X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1769156581-371094 X-HE-Meta: U2FsdGVkX1+BBM080y7yfNhQ+L+dCd19AHIqqlHKH65NJpJo7ZVwcVgrX+LtjHk2yy6AEU6SKN3ccSdF6etXbSXaXFtmKUg5TeTWhmGVVf6ULC1TzPhHSKBlH8Fa6eVsU3/n3yZrsS6Y8FTwBGN60NL8OSBjqPfY7gZXXSBIU70i7MA8CdcBcUR41XTwooygIS9f6BuJb+pizD+QkamnMHBVBUy+li+Fk8nqIZ5Reg78mvixBEEFpIRMgvmNzx3sKQ2E4LWfyCf+lp5gUJ7Ll9MkVQLWrIY7vWoT+ByVci36eSz+C1iU37ABC4mlrYH4E+nw1QguALHL6wjHSggZSlG7woc7UZd0qPISOmMyb9DlGzaP4Y9d+YyycHVYcBw88THzwNtfIG1aJqQSSlbhSVLC+Tg58b9VTtyIXh3pRGCCYV3oisy+d/qrQt0/etPagU+UapsNh26Z3hpn+uyJJJjiJthCgp788j4mkQMaWtZYF0ichEKqys4GG5b8D+p00mcleQKZ3axrEbQO7tMknZ1yl2r+54Q0Def0DVnAwY0SB4os9WIGW3NmKoLUmpVioTGFXHT3EhxKXWellEwvj2PlaN2GhhPKnCWkZyEP6o3eBlFomMVCFrNAitPyjhjqrblI7YhyT9pI6659OJql0NmWwwxEhujz+9bQea5AX7HjgH9t8nYaUewO49N50cjB2/Fy660aAcEjI06nMuALo3k9r4Tdgg/Ms263dqKTZxuRHsOVIVCZQA+6DIdwn/m+mYqZGd3H34GUVh2e3XAdsF7mpGgfaXps6rW8poVCF4YnW3zYhufFcht1K9f50WFgtrKJmlP82WCjQbXFpIk/0K0iiozoT3iQrwys5cd7a/xpEagRr3i4x35la5evGxOR1J1VgL9J9cZ6aAbWrG1PVjnvYyc4SUv6UGZ9IiZN1kXedTwV6ype/tdGwmBNK+Hed+Ru91qoJ1J9kv32czR ITU7qU+A 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 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: From: Vernon Yang Add mm_khugepaged_scan event to track the total time for full scan and the total number of pages scanned of khugepaged. Signed-off-by: Vernon Yang Acked-by: David Hildenbrand (Red Hat) Reviewed-by: Barry Song Reviewed-by: Lance Yang --- include/trace/events/huge_memory.h | 25 +++++++++++++++++++++++++ mm/khugepaged.c | 2 ++ 2 files changed, 27 insertions(+) diff --git a/include/trace/events/huge_memory.h b/include/trace/events/huge_memory.h index 4e41bff31888..384e29f6bef0 100644 --- a/include/trace/events/huge_memory.h +++ b/include/trace/events/huge_memory.h @@ -237,5 +237,30 @@ TRACE_EVENT(mm_khugepaged_collapse_file, __print_symbolic(__entry->result, SCAN_STATUS)) ); +TRACE_EVENT(mm_khugepaged_scan, + + TP_PROTO(struct mm_struct *mm, unsigned int progress, + bool full_scan_finished), + + TP_ARGS(mm, progress, full_scan_finished), + + TP_STRUCT__entry( + __field(struct mm_struct *, mm) + __field(unsigned int, progress) + __field(bool, full_scan_finished) + ), + + TP_fast_assign( + __entry->mm = mm; + __entry->progress = progress; + __entry->full_scan_finished = full_scan_finished; + ), + + TP_printk("mm=%p, progress=%u, full_scan_finished=%d", + __entry->mm, + __entry->progress, + __entry->full_scan_finished) +); + #endif /* __HUGE_MEMORY_H */ #include diff --git a/mm/khugepaged.c b/mm/khugepaged.c index e76f42243534..6f0f05148765 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -2535,6 +2535,8 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, enum scan_result collect_mm_slot(slot); } + trace_mm_khugepaged_scan(mm, progress, khugepaged_scan.mm_slot == NULL); + return progress; } -- 2.51.0