public inbox for linux-kernel@vger.kernel.org
 help / color / mirror / Atom feed
From: Anton Blanchard <anton@samba.org>
To: mingo@elte.hu, tglx@timesys.com
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] Fix timer_stats printout of events/sec
Date: Mon, 1 Oct 2007 08:05:40 -0500	[thread overview]
Message-ID: <20071001130540.GA22646@kryten> (raw)


Hi,

When using /proc/timer_stats on ppc64 I noticed the events/sec field
wasnt accurate. Sometimes the integer part was incorrect due to rounding
(we werent taking the fractional seconds into consideration).

The fraction part is also wrong, we need to pad the printf statement and
take the bottom three digits of 1000 times the value.

Signed-off-by: Anton Blanchard <anton@samba.org>
---

diff --git a/kernel/time/timer_stats.c b/kernel/time/timer_stats.c
index 3c38fb5..c36bb7e 100644
--- a/kernel/time/timer_stats.c
+++ b/kernel/time/timer_stats.c
@@ -327,8 +327,9 @@ static int tstats_show(struct seq_file *m, void *v)
 		ms = 1;
 
 	if (events && period.tv_sec)
-		seq_printf(m, "%ld total events, %ld.%ld events/sec\n", events,
-			   events / period.tv_sec, events * 1000 / ms);
+		seq_printf(m, "%ld total events, %ld.%03ld events/sec\n",
+			   events, events * 1000 / ms,
+			   (events * 1000000 / ms) % 1000);
 	else
 		seq_printf(m, "%ld total events\n", events);
 

                 reply	other threads:[~2007-10-01 13:07 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

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=20071001130540.GA22646@kryten \
    --to=anton@samba.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=tglx@timesys.com \
    /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