From: Steven Rostedt <rostedt@goodmis.org>
To: Vaibhav Nagarnaik <vnagarnaik@google.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@redhat.com>, Michael Rubin <mrubin@google.com>,
David Sharp <dhsharp@google.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/5] trace: Add a new readonly entry to report total buffer size
Date: Fri, 29 Jul 2011 14:01:03 -0400 [thread overview]
Message-ID: <1311962463.21143.70.camel@gandalf.stny.rr.com> (raw)
In-Reply-To: <1311721194-12164-2-git-send-email-vnagarnaik@google.com>
On Tue, 2011-07-26 at 15:59 -0700, Vaibhav Nagarnaik wrote:
> The current file "buffer_size_kb" reports the size of per-cpu buffer and
> not the overall memory allocated which could be misleading. A new file
> "buffer_total_size_kb" adds up all the enabled CPU buffer sizes and
> reports it. This is only a readonly entry.
>
> Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
> ---
> kernel/trace/trace.c | 27 +++++++++++++++++++++++++++
> 1 files changed, 27 insertions(+), 0 deletions(-)
>
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index e5df02c..ce57c55 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -3569,6 +3569,24 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
> }
>
> static ssize_t
> +tracing_total_entries_read(struct file *filp, char __user *ubuf,
> + size_t cnt, loff_t *ppos)
> +{
> + struct trace_array *tr = filp->private_data;
> + char buf[64];
> + int r, cpu;
> + unsigned long size = 0;
> +
> + mutex_lock(&trace_types_lock);
> + for_each_tracing_cpu(cpu)
> + size += tr->entries >> 10;
Could you make this consistent with buffer_size_kb as well. That is, if
the buffer is "shrunk", could you have the expanded size printed as
well.
Thanks,
-- Steve
> + mutex_unlock(&trace_types_lock);
> +
> + r = sprintf(buf, "%lu\n", size);
> + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
> +}
> +
> +static ssize_t
> tracing_free_buffer_write(struct file *filp, const char __user *ubuf,
> size_t cnt, loff_t *ppos)
> {
> @@ -3739,6 +3757,12 @@ static const struct file_operations tracing_entries_fops = {
> .llseek = generic_file_llseek,
> };
>
> +static const struct file_operations tracing_total_entries_fops = {
> + .open = tracing_open_generic,
> + .read = tracing_total_entries_read,
> + .llseek = generic_file_llseek,
> +};
> +
> static const struct file_operations tracing_free_buffer_fops = {
> .write = tracing_free_buffer_write,
> .release = tracing_free_buffer_release,
> @@ -4450,6 +4474,9 @@ static __init int tracer_init_debugfs(void)
> trace_create_file("buffer_size_kb", 0644, d_tracer,
> &global_trace, &tracing_entries_fops);
>
> + trace_create_file("buffer_total_size_kb", 0444, d_tracer,
> + &global_trace, &tracing_total_entries_fops);
> +
> trace_create_file("free_buffer", 0644, d_tracer,
> &global_trace, &tracing_free_buffer_fops);
>
next prev parent reply other threads:[~2011-07-29 18:01 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-26 22:59 [PATCH 0/5] Add dynamic updates to trace ring buffer Vaibhav Nagarnaik
2011-07-26 22:59 ` [PATCH 1/5] trace: Add a new readonly entry to report total buffer size Vaibhav Nagarnaik
2011-07-29 18:01 ` Steven Rostedt [this message]
2011-07-29 19:09 ` Vaibhav Nagarnaik
2011-07-26 22:59 ` [PATCH 2/5] trace: Add ring buffer stats to measure rate of events Vaibhav Nagarnaik
2011-07-29 18:10 ` Steven Rostedt
2011-07-29 19:10 ` Vaibhav Nagarnaik
2011-07-26 22:59 ` [PATCH 3/5] trace: Add per_cpu ring buffer control files Vaibhav Nagarnaik
2011-07-29 18:14 ` Steven Rostedt
2011-07-29 19:13 ` Vaibhav Nagarnaik
2011-07-29 21:25 ` Steven Rostedt
2011-07-26 22:59 ` [PATCH 4/5] trace: Make removal of ring buffer pages atomic Vaibhav Nagarnaik
2011-07-29 21:23 ` Steven Rostedt
2011-07-29 23:30 ` Vaibhav Nagarnaik
2011-07-30 1:12 ` Steven Rostedt
2011-07-30 1:50 ` David Sharp
2011-07-30 2:43 ` Steven Rostedt
2011-07-30 3:44 ` David Sharp
2011-07-26 22:59 ` [PATCH 5/5] trace: Make addition of pages in ring buffer atomic Vaibhav Nagarnaik
2011-08-16 21:46 ` [PATCH v2 0/5] Add dynamic updates to trace ring buffer Vaibhav Nagarnaik
2011-08-16 21:46 ` [PATCH v2 1/5] trace: Add a new readonly entry to report total buffer size Vaibhav Nagarnaik
2011-08-16 21:46 ` [PATCH v2 2/5] trace: Add ring buffer stats to measure rate of events Vaibhav Nagarnaik
2011-08-16 21:46 ` [PATCH v2 3/5] trace: Add per_cpu ring buffer control files Vaibhav Nagarnaik
2011-08-22 20:29 ` Steven Rostedt
2011-08-22 20:36 ` Vaibhav Nagarnaik
2011-08-22 22:09 ` [PATCH v3] " Vaibhav Nagarnaik
2011-08-23 0:49 ` Steven Rostedt
2011-08-23 1:16 ` Vaibhav Nagarnaik
2011-08-23 1:17 ` Vaibhav Nagarnaik
2011-09-03 2:45 ` Steven Rostedt
2011-09-06 18:56 ` Vaibhav Nagarnaik
2011-09-07 17:13 ` Steven Rostedt
2011-10-12 1:20 ` [PATCH v4 1/4] " Vaibhav Nagarnaik
2012-01-31 23:53 ` Vaibhav Nagarnaik
2012-02-02 2:42 ` Steven Rostedt
2012-02-02 19:20 ` Vaibhav Nagarnaik
2012-02-02 20:00 ` [PATCH v5 " Vaibhav Nagarnaik
2012-02-02 20:00 ` [PATCH v5 2/4] trace: Make removal of ring buffer pages atomic Vaibhav Nagarnaik
2012-04-21 4:27 ` Steven Rostedt
2012-04-23 17:31 ` Vaibhav Nagarnaik
2012-04-25 21:18 ` [PATCH v6 1/3] " Vaibhav Nagarnaik
2012-04-25 21:18 ` [PATCH v6 2/3] trace: Make addition of pages in ring buffer atomic Vaibhav Nagarnaik
2012-04-25 21:18 ` [PATCH v6 3/3] trace: change CPU ring buffer state from tracing_cpumask Vaibhav Nagarnaik
2012-05-03 1:55 ` [PATCH v6 1/3] trace: Make removal of ring buffer pages atomic Steven Rostedt
2012-05-03 6:40 ` Vaibhav Nagarnaik
2012-05-03 12:57 ` Steven Rostedt
2012-05-03 14:12 ` Steven Rostedt
2012-05-03 18:43 ` Vaibhav Nagarnaik
2012-05-03 18:54 ` Steven Rostedt
2012-05-03 18:54 ` Vaibhav Nagarnaik
2012-05-04 1:59 ` [PATCH v7 " Vaibhav Nagarnaik
2012-05-04 1:59 ` [PATCH v7 2/3] trace: Make addition of pages in ring buffer atomic Vaibhav Nagarnaik
2012-05-19 10:18 ` [tip:perf/core] ring-buffer: " tip-bot for Vaibhav Nagarnaik
2012-05-04 1:59 ` [PATCH v7 3/3] trace: change CPU ring buffer state from tracing_cpumask Vaibhav Nagarnaik
2012-05-19 10:21 ` [tip:perf/core] tracing: " tip-bot for Vaibhav Nagarnaik
2012-05-07 20:22 ` [PATCH v7 1/3] trace: Make removal of ring buffer pages atomic Steven Rostedt
2012-05-07 21:48 ` Vaibhav Nagarnaik
2012-05-08 0:14 ` Steven Rostedt
2012-05-09 3:38 ` Steven Rostedt
2012-05-09 5:00 ` Vaibhav Nagarnaik
2012-05-09 14:29 ` Steven Rostedt
2012-05-09 17:46 ` Vaibhav Nagarnaik
2012-05-09 17:54 ` Steven Rostedt
2012-05-19 10:17 ` [tip:perf/core] ring-buffer: " tip-bot for Vaibhav Nagarnaik
2012-02-02 20:00 ` [PATCH v5 3/4] trace: Make addition of pages in ring buffer atomic Vaibhav Nagarnaik
2012-02-02 20:00 ` [PATCH v5 4/4] trace: change CPU ring buffer state from tracing_cpumask Vaibhav Nagarnaik
2012-03-08 23:51 ` [PATCH v5 1/4] trace: Add per_cpu ring buffer control files Vaibhav Nagarnaik
2012-05-02 21:03 ` [tip:perf/core] ring-buffer: " tip-bot for Vaibhav Nagarnaik
2011-10-12 1:20 ` [PATCH v4 2/4] trace: Make removal of ring buffer pages atomic Vaibhav Nagarnaik
2011-10-12 1:20 ` [PATCH v4 3/4] trace: Make addition of pages in ring buffer atomic Vaibhav Nagarnaik
2011-10-12 1:20 ` [PATCH v4 4/4] trace: change CPU ring buffer state from tracing_cpumask Vaibhav Nagarnaik
2011-08-16 21:46 ` [PATCH v2 4/5] trace: Make removal of ring buffer pages atomic Vaibhav Nagarnaik
2011-08-23 3:27 ` Steven Rostedt
2011-08-23 18:55 ` Vaibhav Nagarnaik
2011-08-23 18:55 ` [PATCH v3 " Vaibhav Nagarnaik
2011-08-23 19:16 ` David Sharp
2011-08-23 19:20 ` Vaibhav Nagarnaik
2011-08-23 19:24 ` Steven Rostedt
2011-08-23 18:55 ` [PATCH v3 5/5] trace: Make addition of pages in ring buffer atomic Vaibhav Nagarnaik
2011-08-16 21:46 ` [PATCH v2 " Vaibhav Nagarnaik
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