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

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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>
This commit is contained in:
qiwu.chen 2024-08-07 10:56:27 +08:00 committed by Andrew Morton
parent 47baed6a13
commit 62e73fd85d
1 changed files with 6 additions and 2 deletions
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8
mm/kfence/report.c
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@ -16,6 +16,7 @@
#include <linux/sprintf.h> #include <linux/sprintf.h>
#include <linux/stacktrace.h> #include <linux/stacktrace.h>
#include <linux/string.h> #include <linux/string.h>
#include <linux/sched/clock.h>
#include <trace/events/error_report.h> #include <trace/events/error_report.h>
#include <asm/kfence.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; const struct kfence_track *track = show_alloc ? &meta->alloc_track : &meta->free_track;
u64 ts_sec = track->ts_nsec; u64 ts_sec = track->ts_nsec;
unsigned long rem_nsec = do_div(ts_sec, NSEC_PER_SEC); 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. */ /* 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, 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) { if (track->num_stack_entries) {
/* Skip allocation/free internals stack. */ /* Skip allocation/free internals stack. */