+ mm-kfence-print-the-elapsed-time-for-allocated-freed-track.patch added to mm-unstable branch

+ mm-kfence-print-the-elapsed-time-for-allocated-freed-track.patch added to mm-unstable branch

[Andrew Morton]

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

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: "qiwu.chen" <qiwuchen55@gmail.com>
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@transsion.com
Signed-off-by: qiwu.chen <qiwu.chen@transsion.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: chenqiwu <qiwu.chen@transsion.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@gmail.com are

mm-kfence-print-the-elapsed-time-for-allocated-freed-track.patch