linux-kernel - [PATCH V1 2/2] mm/damon: Modify the display form of damon tracepoint

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Date:   Fri, 10 Dec 2021 00:33:17 +0800
From:   Xin Hao <xhao@...ux.alibaba.com>
To:     sj@...nel.org
Cc:     xhao@...ux.alibaba.com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH V1 2/2] mm/damon: Modify the display form of damon tracepoint

When I use the perf command to record damon monitor data, like below.
    # perf record -e damon:damon_aggregated
    # perf script
    ...target_id=18446462667479739520 nr_regions=13 281472805928960-281472942936064...
    ...target_id=18446462667479739520 nr_regions=13 281472942936064-281473080008704...
    ...target_id=18446462667479739520 nr_regions=13 281473080008704-281473216634880...

>From a user's point of view, the 'target_id' and 'damon_region' which displays in decimal
are not very friendly, So there do some changes, keep the 'target_id' display consistent
with 'dbgfs/target_ids' interface and 'damon_region' is displayed in hexadecimal, just like
below.
    # perf record -e damon:damon_aggregated
    # perf script
    ...target_id=5522 nr_regions=14 ffff716a3000-ffff79893000...
    ...target_id=5522 nr_regions=14 ffff79893000-ffff819dc000...
    ...target_id=5522 nr_regions=14 ffff819dc000-ffff89bd9000...

Signed-off-by: Xin Hao <xhao@...ux.alibaba.com>
---
 include/trace/events/damon.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/trace/events/damon.h b/include/trace/events/damon.h
index 99ffa601e351..67de51814f4c 100644
--- a/include/trace/events/damon.h
+++ b/include/trace/events/damon.h
@@ -17,7 +17,7 @@ TRACE_EVENT(damon_aggregated,
 	TP_ARGS(t, r, nr_regions),

 	TP_STRUCT__entry(
-		__field(unsigned long, target_id)
+		__field(int, target_id)
 		__field(unsigned int, nr_regions)
 		__field(unsigned long, start)
 		__field(unsigned long, end)
@@ -26,7 +26,7 @@ TRACE_EVENT(damon_aggregated,
 	),

 	TP_fast_assign(
-		__entry->target_id = t->id;
+		__entry->target_id = (int)pid_vnr((struct pid *)t->id);
 		__entry->nr_regions = nr_regions;
 		__entry->start = r->ar.start;
 		__entry->end = r->ar.end;
@@ -34,7 +34,7 @@ TRACE_EVENT(damon_aggregated,
 		__entry->age = r->age;
 	),

-	TP_printk("target_id=%lu nr_regions=%u %lu-%lu: %u %u",
+	TP_printk("target_id=%u nr_regions=%u %lx-%lx: %u %u",
 			__entry->target_id, __entry->nr_regions,
 			__entry->start, __entry->end,
 			__entry->nr_accesses, __entry->age)
--
2.31.0