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: 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>
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@ -16,6 +16,7 @@
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#include <linux/sprintf.h>
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#include <linux/stacktrace.h>
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#include <linux/string.h>
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#include <linux/sched/clock.h>
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#include <trace/events/error_report.h>
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#include <asm/kfence.h>
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@ -108,11 +109,14 @@ static void kfence_print_stack(struct seq_file *seq, const struct kfence_metadat
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const struct kfence_track *track = show_alloc ? &meta->alloc_track : &meta->free_track;
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u64 ts_sec = track->ts_nsec;
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unsigned long rem_nsec = do_div(ts_sec, NSEC_PER_SEC);
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u64 interval_nsec = local_clock() - meta->alloc_track.ts_nsec;
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unsigned long rem_interval_nsec = do_div(interval_nsec, NSEC_PER_SEC);
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/* Timestamp matches printk timestamp format. */
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seq_con_printf(seq, "%s by task %d on cpu %d at %lu.%06lus:\n",
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seq_con_printf(seq, "%s by task %d on cpu %d at %lu.%06lus (%lu.%06lus ago):\n",
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show_alloc ? "allocated" : "freed", track->pid,
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track->cpu, (unsigned long)ts_sec, rem_nsec / 1000);
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track->cpu, (unsigned long)ts_sec, rem_nsec / 1000,
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(unsigned long)interval_nsec, rem_interval_nsec / 1000);
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if (track->num_stack_entries) {
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/* Skip allocation/free internals stack. */
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