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Mon, 15 Dec 2025 01:06:17 -0800 (PST) From: Vernon Yang X-Google-Original-From: Vernon Yang To: akpm@linux-foundation.org, david@kernel.org, lorenzo.stoakes@oracle.com Cc: ziy@nvidia.com, npache@redhat.com, baohua@kernel.org, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vernon Yang Subject: [PATCH 1/4] mm: khugepaged: add trace_mm_khugepaged_scan event Date: Mon, 15 Dec 2025 17:04:16 +0800 Message-ID: <20251215090419.174418-2-yanglincheng@kylinos.cn> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251215090419.174418-1-yanglincheng@kylinos.cn> References: <20251215090419.174418-1-yanglincheng@kylinos.cn> 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" 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 --- include/trace/events/huge_memory.h | 24 ++++++++++++++++++++++++ mm/khugepaged.c | 2 ++ 2 files changed, 26 insertions(+) diff --git a/include/trace/events/huge_memory.h b/include/trace/events/huge= _memory.h index dd94d14a2427..b2824c2f8238 100644 --- a/include/trace/events/huge_memory.h +++ b/include/trace/events/huge_memory.h @@ -237,5 +237,29 @@ TRACE_EVENT(mm_khugepaged_collapse_file, __print_symbolic(__entry->result, SCAN_STATUS)) ); =20 +TRACE_EVENT(mm_khugepaged_scan, + + TP_PROTO(struct mm_struct *mm, int progress, bool full), + + TP_ARGS(mm, progress, full), + + TP_STRUCT__entry( + __field(struct mm_struct *, mm) + __field(int, progress) + __field(bool, full) + ), + + TP_fast_assign( + __entry->mm =3D mm; + __entry->progress =3D progress; + __entry->full =3D full; + ), + + TP_printk("mm=3D%p, progress=3D%d, full=3D%d", + __entry->mm, + __entry->progress, + __entry->full) +); + #endif /* __HUGE_MEMORY_H */ #include diff --git a/mm/khugepaged.c b/mm/khugepaged.c index abe54f0043c7..0598a19a98cc 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -2516,6 +2516,8 @@ static unsigned int khugepaged_scan_mm_slot(unsigned = int pages, int *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