From: Dmitry Safonov <0x7f454c46@gmail.com>
To: rostedt@goodmis.org, mingo@redhat.com
Cc: linux-kernel@vger.kernel.org, Dmitry Safonov <0x7f454c46@gmail.com>
Subject: [RFC] trace_irqsoff: remove redundant reset per-CPU buff
Date: Mon, 19 Oct 2015 21:10:26 +0300 [thread overview]
Message-ID: <1445278226-16187-1-git-send-email-0x7f454c46@gmail.com> (raw)
There is no reason to do it twice: from commit b6f11df26fdc28
("trace: Call tracing_reset_online_cpus before tracer->init()")
resetting of per-CPU buffers done before tracer->init() call.
tracer->init() calls {irqs,preempt,preemptirqs}off_tracer_init() and it
calls __irqsoff_tracer_init(), which resets per-CPU ringbuffer second
time.
It's slowpath, but anyway.
Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com>
---
kernel/trace/trace_irqsoff.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 8523ea345f2b1a..4ebcb8bfaced24 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -612,7 +612,6 @@ static int __irqsoff_tracer_init(struct trace_array *tr)
irqsoff_trace = tr;
/* make sure that the tracer is visible */
smp_wmb();
- tracing_reset_online_cpus(&tr->trace_buffer);
ftrace_init_array_ops(tr, irqsoff_tracer_call);
--
2.6.1
next reply other threads:[~2015-10-19 18:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-19 18:10 Dmitry Safonov [this message]
2015-11-03 18:25 ` [RFC] trace_irqsoff: remove redundant reset per-CPU buff Dmitry Safonov
2015-11-03 18:37 ` Steven Rostedt
2016-02-05 2:40 ` Steven Rostedt
2016-02-05 11:52 ` Dmitry Safonov
2016-02-05 14:40 ` Steven Rostedt
2016-02-05 15:04 ` Steven Rostedt
2016-02-05 15:56 ` Dmitry Safonov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1445278226-16187-1-git-send-email-0x7f454c46@gmail.com \
--to=0x7f454c46@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=rostedt@goodmis.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).