Commit 62e73fd8 authored by qiwu.chen's avatar qiwu.chen Committed by Andrew Morton
Browse files

mm: kfence: print the elapsed time for allocated/freed track 

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: default avatarqiwu.chen <qiwu.chen@transsion.com>
Reviewed-by: default avatarMarco Elver <elver@google.com>
Cc: chenqiwu <qiwu.chen@transsion.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 47baed6a

mm/kfence/report.c

+6 −2
Original line number Diff line number Diff line
@@ -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 seq_file *seq, const struct kfence_metadat 
	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. */