lkml.org 
[lkml]   [2010]   [Jun]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] tracing: reduce latency and remove percpu trace_seq
Steven Rostedt wrote:

>
> The "print" in the trace_seq_printf() is the TP_printk() field of the
> TRACE_EVENT. I believe that there were some events (ext4?) that did
> things that required preemption disabled.
>

It seems that ext4 has no such events.
I find jbd2_dev_to_name() in the TP_printk() field of ext4's tracepoints.
And it seems that jbd2_dev_to_name() requires preemption enabled and sleepable.

Maybe there were some events did things that required preemption disabled.
But No document ensure TP_printk() preemption disabled, such events should
be fixed, I think.


\
 
 \ /
  Last update: 2010-06-04 04:27    [W:0.300 / U:0.084 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site