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ring-buffer: Add a little more information and a WARN when time stamp going backwards is detected 

When the CONFIG_RING_BUFFER_VALIDATE_TIME_DELTAS is enabled, and the time
stamps are detected as not being valid, it reports information about the
write stamp, but does not show the before_stamp which is still useful
information. Also, it should give a warning once, such that tests detect
this happening.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2021-03-03 18:23:40 -05:00
parent 6f6be606e7
commit 6549de1fe3
1 changed files with 7 additions and 3 deletions
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10
kernel/trace/ring_buffer.c
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@ -3318,9 +3318,13 @@ static void check_buffer(struct ring_buffer_per_cpu *cpu_buffer,
goto out;
}
atomic_inc(&cpu_buffer->record_disabled);
pr_warn("[CPU: %d]TIME DOES NOT MATCH expected:%lld actual:%lld delta:%lld after:%lld\n",
cpu_buffer->cpu,
ts + info->delta, info->ts, info->delta, info->after);
/* There's some cases in boot up that this can happen */
WARN_ON_ONCE(system_state != SYSTEM_BOOTING);
pr_warn("[CPU: %d]TIME DOES NOT MATCH expected:%lld actual:%lld delta:%lld before:%lld after:%lld%s\n",
cpu_buffer->cpu,
ts + info->delta, info->ts, info->delta,
info->before, info->after,
full ? " (full)" : "");
dump_buffer_page(bpage, info, tail);
atomic_dec(&ts_dump);
/* Do not re-enable checking */