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Sat, 21 Feb 2026 01:39:53 -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 v8 1/4] mm: khugepaged: add trace_mm_khugepaged_scan event Date: Sat, 21 Feb 2026 17:39:15 +0800 Message-ID: <20260221093918.1456187-2-vernon2gm@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260221093918.1456187-1-vernon2gm@gmail.com> References: <20260221093918.1456187-1-vernon2gm@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" 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 Reviewed-by: Dev Jain Reviewed-by: Lorenzo Stoakes (Oracle) --- 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)) ); =20 +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 =3D mm; + __entry->progress =3D progress; + __entry->full_scan_finished =3D full_scan_finished; + ), + + TP_printk("mm=3D%p, progress=3D%u, full_scan_finished=3D%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 c0f893bebcff..e2f6b68a0011 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -2527,6 +2527,8 @@ static unsigned int khugepaged_scan_mm_slot(unsigned = int pages, enum scan_result collect_mm_slot(slot); } =20 + trace_mm_khugepaged_scan(mm, progress, khugepaged_scan.mm_slot =3D=3D NUL= L); + return progress; } =20 --=20 2.51.0