Re: [RFC PATCH 6/7] mm: add tracepoints and vmstat counters for async teardown
From: Steven Rostedt <rostedt@goodmis.org>
Date: 2026-07-21 21:17:23
Also in:
linux-doc, linux-mm, lkml
On Mon, 20 Jul 2026 00:24:08 +0530 Aditya Sharma [off-list ref] wrote:
quoted hunk ↗ jump to hunk
diff --git a/include/trace/events/mm_reaper.h b/include/trace/events/mm_reaper.h new file mode 100644 index 000000000..315bced7c --- /dev/null +++ b/include/trace/events/mm_reaper.h@@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM mm_reaper + +#if !defined(_TRACE_MM_REAPER_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_MM_REAPER_H + +#include <linux/tracepoint.h> +#include <linux/sched.h> +#include <linux/topology.h> + +TRACE_EVENT(mm_async_teardown_queue, + + TP_PROTO(struct mm_struct *mm, unsigned long rss), + + TP_ARGS(mm, rss), + + TP_STRUCT__entry( + __field(struct mm_struct *, mm) + __field(int, pid) + __array(char, comm, TASK_COMM_LEN)
There's an effort to make comm size more dynamic and we want to prevent more memcpy of the comm based on TASK_COMM_LEN. Please change the above to: __string(comm, comm);
+ __field(unsigned long, rss) + __field(int, node) + ), + + TP_fast_assign( + __entry->mm = mm; + __entry->pid = current->pid; + memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
And this to: __assign_str(comm);
+ __entry->rss = rss;
+ __entry->node = numa_node_id();
+ ),
+
+ TP_printk("mm=%p pid=%d comm=%s rss=%lukB node=%d",
+ __entry->mm,
+ __entry->pid,
+ __entry->comm,and this to: __get_str(comm), Thanks, -- Steve
+ __entry->rss << (PAGE_SHIFT - 10), + __entry->node + ) +); +