From: Thomas Ballasi <tballasi@linux.microsoft.com>
Date: Mon, 16 Mar 2026 16:09:08 +0000 (-0700)
Subject: mm: vmscan: add PIDs to vmscan tracepoints
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=77a9c445b668765129f877d3c0d08ec4dc3ce77b;p=thirdparty%2Fkernel%2Flinux.git

mm: vmscan: add PIDs to vmscan tracepoints

The changes aims at adding additionnal tracepoints variables to help
debuggers attribute them to specific processes.

Link: https://lkml.kernel.org/r/20260316160908.42727-4-tballasi@linux.microsoft.com
Signed-off-by: Thomas Ballasi <tballasi@linux.microsoft.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Wei Xu <weixugc@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index c9e637c10f961..4445a8d9218de 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -140,10 +140,12 @@ DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_begin_template,
 		__entry->memcg_id	= mem_cgroup_id(memcg);
 	),
 
-	TP_printk("order=%d gfp_flags=%s memcg_id=%llu",
+	TP_printk("order=%d gfp_flags=%s pid=%d memcg_id=%llu %s",
 		__entry->order,
 		show_gfp_flags(__entry->gfp_flags),
-		__entry->memcg_id)
+		__entry->ent.pid,
+		__entry->memcg_id,
+		__event_in_irq() ? "(in-irq)" : "")
 );
 
 DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_direct_reclaim_begin,
@@ -185,9 +187,11 @@ DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_end_template,
 		__entry->memcg_id	= mem_cgroup_id(memcg);
 	),
 
-	TP_printk("nr_reclaimed=%lu memcg_id=%llu",
+	TP_printk("nr_reclaimed=%lu pid=%d memcg_id=%llu %s",
 		__entry->nr_reclaimed,
-		__entry->memcg_id)
+		__entry->ent.pid,
+		__entry->memcg_id,
+		__event_in_irq() ? "(in-irq)" : "")
 );
 
 DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_direct_reclaim_end,
@@ -248,17 +252,19 @@ TRACE_EVENT(mm_shrink_slab_start,
 		__entry->memcg_id = mem_cgroup_id(memcg);
 	),
 
-	TP_printk("%pS %p: nid: %d memcg_id: %llu objects to shrink %ld gfp_flags %s cache items %ld delta %lld total_scan %ld priority %d",
+	TP_printk("%pS %p: nid: %d pid: %d memcg_id: %llu objects to shrink %ld gfp_flags %s cache items %ld delta %lld total_scan %ld priority %d %s",
 		__entry->shrink,
 		__entry->shr,
 		__entry->nid,
+		__entry->ent.pid,
 		__entry->memcg_id,
 		__entry->nr_objects_to_shrink,
 		show_gfp_flags(__entry->gfp_flags),
 		__entry->cache_items,
 		__entry->delta,
 		__entry->total_scan,
-		__entry->priority)
+		__entry->priority,
+		__event_in_irq() ? "(in-irq)" : "")
 );
 
 TRACE_EVENT(mm_shrink_slab_end,
@@ -290,15 +296,17 @@ TRACE_EVENT(mm_shrink_slab_end,
 		__entry->memcg_id = mem_cgroup_id(memcg);
 	),
 
-	TP_printk("%pS %p: nid: %d memcg_id: %llu unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d",
+	TP_printk("%pS %p: nid: %d pid: %d memcg_id: %llu unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d %s",
 		__entry->shrink,
 		__entry->shr,
 		__entry->nid,
+		__entry->ent.pid,
 		__entry->memcg_id,
 		__entry->unused_scan,
 		__entry->new_scan,
 		__entry->total_scan,
-		__entry->retval)
+		__entry->retval,
+		__event_in_irq() ? "(in-irq)" : "")
 );
 
 TRACE_EVENT(mm_vmscan_lru_isolate,