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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Aug 2025 15:36:00.4781 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9f0a5301-2d55-4991-bb69-08dddb484570 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017098.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4269 Content-Type: text/plain; charset="utf-8" Add tracing support to track - start and end of scanning. - migration. CC: Steven Rostedt CC: Masami Hiramatsu CC: linux-trace-kernel@vger.kernel.org Signed-off-by: Raghavendra K T --- include/trace/events/kmem.h | 99 +++++++++++++++++++++++++++++++++++++ mm/kscand.c | 9 ++++ 2 files changed, 108 insertions(+) diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h index f74925a6cf69..d6e544b067b9 100644 --- a/include/trace/events/kmem.h +++ b/include/trace/events/kmem.h @@ -9,6 +9,105 @@ #include #include =20 +#ifdef CONFIG_KSCAND +DECLARE_EVENT_CLASS(kmem_mm_class, + + TP_PROTO(struct mm_struct *mm), + + TP_ARGS(mm), + + TP_STRUCT__entry( + __field( struct mm_struct *, mm ) + ), + + TP_fast_assign( + __entry->mm =3D mm; + ), + + TP_printk("mm =3D %p", __entry->mm) +); + +DEFINE_EVENT(kmem_mm_class, kmem_mm_enter, + TP_PROTO(struct mm_struct *mm), + TP_ARGS(mm) +); + +DEFINE_EVENT(kmem_mm_class, kmem_mm_exit, + TP_PROTO(struct mm_struct *mm), + TP_ARGS(mm) +); + +DEFINE_EVENT(kmem_mm_class, kmem_scan_mm_start, + TP_PROTO(struct mm_struct *mm), + TP_ARGS(mm) +); + +TRACE_EVENT(kmem_scan_mm_end, + + TP_PROTO( struct mm_struct *mm, + unsigned long start, + unsigned long total, + unsigned long scan_period, + unsigned long scan_size, + int target_node), + + TP_ARGS(mm, start, total, scan_period, scan_size, target_node), + + TP_STRUCT__entry( + __field( struct mm_struct *, mm ) + __field( unsigned long, start ) + __field( unsigned long, total ) + __field( unsigned long, scan_period ) + __field( unsigned long, scan_size ) + __field( int, target_node ) + ), + + TP_fast_assign( + __entry->mm =3D mm; + __entry->start =3D start; + __entry->total =3D total; + __entry->scan_period =3D scan_period; + __entry->scan_size =3D scan_size; + __entry->target_node =3D target_node; + ), + + TP_printk("mm=3D%p, start =3D %ld, total =3D %ld, scan_period =3D %ld, sc= an_size =3D %ld node =3D %d", + __entry->mm, __entry->start, __entry->total, __entry->scan_period, + __entry->scan_size, __entry->target_node) +); + +TRACE_EVENT(kmem_scan_mm_migrate, + + TP_PROTO(struct mm_struct *mm, + int rc, + int target_node, + int msuccess, + int mfailed), + + TP_ARGS(mm, rc, target_node, msuccess, mfailed), + + TP_STRUCT__entry( + __field( struct mm_struct *, mm ) + __field( int, rc ) + __field( int, target_node ) + __field( int, msuccess ) + __field( int, mfailed ) + ), + + TP_fast_assign( + __entry->mm =3D mm; + __entry->rc =3D rc; + __entry->target_node =3D target_node; + __entry->msuccess =3D msuccess; + __entry->mfailed =3D mfailed; + ), + + TP_printk("mm =3D %p rc =3D %d node =3D %d msuccess =3D %d mfailed =3D %d= ", + __entry->mm, __entry->rc, __entry->target_node, + __entry->msuccess, __entry->mfailed) +); +#endif + TRACE_EVENT(kmem_cache_alloc, =20 TP_PROTO(unsigned long call_site, diff --git a/mm/kscand.c b/mm/kscand.c index e14645565ba7..273306f47553 100644 --- a/mm/kscand.c +++ b/mm/kscand.c @@ -1105,6 +1105,7 @@ static void kmigrated_migrate_mm(struct kmigrated_mm_= slot *mm_slot) count_kscand_migrate_failed(); mfailed++; } + trace_kmem_scan_mm_migrate(mm, ret, dest, msuccess, mfailed); =20 kfree(info); =20 @@ -1308,6 +1309,9 @@ static unsigned long kscand_scan_mm_slot(void) mm_target_node =3D READ_ONCE(mm->target_node); if (mm_target_node !=3D mm_slot_target_node) WRITE_ONCE(mm->target_node, mm_slot_target_node); + + trace_kmem_scan_mm_start(mm); + now =3D jiffies; =20 if (mm_slot_next_scan && time_before(now, mm_slot_next_scan)) @@ -1378,6 +1382,9 @@ static unsigned long kscand_scan_mm_slot(void) kscand_update_mmslot_info(mm_slot, total, target_node); } =20 + trace_kmem_scan_mm_end(mm, address, total, mm_slot_scan_period, + mm_slot_scan_size, target_node); + outerloop: /* exit_mmap will destroy ptes after this */ mmap_read_unlock(mm); @@ -1530,6 +1537,7 @@ void __kscand_enter(struct mm_struct *mm) spin_unlock(&kscand_mm_lock); =20 mmgrab(mm); + trace_kmem_mm_enter(mm); if (wakeup) wake_up_interruptible(&kscand_wait); } @@ -1540,6 +1548,7 @@ void __kscand_exit(struct mm_struct *mm) struct mm_slot *slot; int free =3D 0, serialize =3D 1; =20 + trace_kmem_mm_exit(mm); spin_lock(&kscand_mm_lock); slot =3D mm_slot_lookup(kscand_slots_hash, mm); mm_slot =3D mm_slot_entry(slot, struct kscand_mm_slot, slot); --=20 2.34.1