The patch titled
Subject: mm: kfence: print the elapsed time for allocated/freed track
has been added to the -mm mm-unstable branch. Its filename is
mm-kfence-print-the-elapsed-time-for-allocated-freed-track.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-kfence-print-the-elapsed-time-for-allocated-freed-track.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "qiwu.chen" <qiwuchen55@xxxxxxxxx>
Subject: mm: kfence: print the elapsed time for allocated/freed track
Date: Wed, 7 Aug 2024 10:56:27 +0800
Print the elapsed time for the allocated or freed track, which can be
useful in some debugging scenarios.
Link: https://lkml.kernel.org/r/20240807025627.37419-1-qiwu.chen@xxxxxxxxxxxxx
Signed-off-by: qiwu.chen <qiwu.chen@xxxxxxxxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Cc: chenqiwu <qiwu.chen@xxxxxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kfence/report.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/mm/kfence/report.c~mm-kfence-print-the-elapsed-time-for-allocated-freed-track
+++ a/mm/kfence/report.c
@@ -16,6 +16,7 @@
#include <linux/sprintf.h>
#include <linux/stacktrace.h>
#include <linux/string.h>
+#include <linux/sched/clock.h>
#include <trace/events/error_report.h>
#include <asm/kfence.h>
@@ -108,11 +109,14 @@ static void kfence_print_stack(struct se
const struct kfence_track *track = show_alloc ? &meta->alloc_track : &meta->free_track;
u64 ts_sec = track->ts_nsec;
unsigned long rem_nsec = do_div(ts_sec, NSEC_PER_SEC);
+ u64 interval_nsec = local_clock() - meta->alloc_track.ts_nsec;
+ unsigned long rem_interval_nsec = do_div(interval_nsec, NSEC_PER_SEC);
/* Timestamp matches printk timestamp format. */
- seq_con_printf(seq, "%s by task %d on cpu %d at %lu.%06lus:\n",
+ seq_con_printf(seq, "%s by task %d on cpu %d at %lu.%06lus (%lu.%06lus ago):\n",
show_alloc ? "allocated" : "freed", track->pid,
- track->cpu, (unsigned long)ts_sec, rem_nsec / 1000);
+ track->cpu, (unsigned long)ts_sec, rem_nsec / 1000,
+ (unsigned long)interval_nsec, rem_interval_nsec / 1000);
if (track->num_stack_entries) {
/* Skip allocation/free internals stack. */
_
Patches currently in -mm which might be from qiwuchen55@xxxxxxxxx are
mm-kfence-print-the-elapsed-time-for-allocated-freed-track.patch
