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* [PATCH 0/5] Add dynamic updates to trace ring buffer
@ 2011-07-26 22:59 Vaibhav Nagarnaik
  2011-07-26 22:59 ` [PATCH 1/5] trace: Add a new readonly entry to report total buffer size Vaibhav Nagarnaik
                   ` (10 more replies)
  0 siblings, 11 replies; 80+ messages in thread
From: Vaibhav Nagarnaik @ 2011-07-26 22:59 UTC (permalink / raw)
  To: Steven Rostedt, Frederic Weisbecker, Ingo Molnar
  Cc: Michael Rubin, David Sharp, linux-kernel, Vaibhav Nagarnaik

These patches are in response to the fact that sometimes there are
higher rate of events generated on some CPUs as compared to others. This
makes it inefficient to have equal memory size allocated to each of the
per-cpu ring buffers.

This patch series adds 3 things to achieve this:
* Add a way to measure the rate of events generated on a CPU. This is a
  part of patch#2 which makes the 'stats' files print out the number of
  bytes in the ring buffer, the oldest time stamp ("head ts"), and the
  current time stamp ("now ts"). The rate is measured as: bytes /
  (now-head)

* The next patch#3 adds the flexibility to assign different sizes to
  individual per-cpu ring buffers. This is done by adding a
  "buffer_size_kb" debugfs file entry under per_cpu/* directories.

* The final two patches provide a way to change the size of ring
  buffer concurrent to events being added to the ring buffer. Patch#4
  adds functionality to remove pages from the ring buffer and patch#5
  adds functionality to add pages to the ring buffer.

Patch#1 adds a debugfs entry "buffer_total_size_kb" which provides the
total memory allocated for the ring buffer.

This makes it easy for a user process to monitor the rate at which the
ring buffers are being filled up and update the individual per-cpu ring
buffer sizes in response to it.

Vaibhav Nagarnaik (5):
  trace: Add a new readonly entry to report total buffer size
  trace: Add ring buffer stats to measure rate of events
  trace: Add per_cpu ring buffer control files
  trace: Make removal of ring buffer pages atomic
  trace: Make addition of pages in ring buffer atomic

 include/linux/ring_buffer.h |    8 +-
 kernel/trace/ring_buffer.c  |  562 +++++++++++++++++++++++++++++++------------
 kernel/trace/trace.c        |  241 ++++++++++++++----
 kernel/trace/trace.h        |    2 +-
 4 files changed, 603 insertions(+), 210 deletions(-)

-- 
1.7.3.1


^ permalink raw reply	[flat|nested] 80+ messages in thread

end of thread, other threads:[~2012-05-19 10:23 UTC | newest]

Thread overview: 80+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
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
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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