linux-kernel - [RFC 0/8] Additional kmsg devices

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Date:	Fri, 03 Jul 2015 12:49:47 +0200
From:	Marcin Niesluchowski <m.niesluchow@...sung.com>
To:	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org
Cc:	Jonathan Corbet <corbet@....net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Petr Mladek <pmladek@...e.cz>, Tejun Heo <tj@...nel.org>,
	Kay Sievers <kay@...y.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joe Perches <joe@...ches.com>,
	Karol Lewandowski <k.lewandowsk@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marcin Niesluchowski <m.niesluchow@...sung.com>
Subject: [RFC 0/8] Additional kmsg devices

Dear All,

This series of patches extends kmsg interface with ability to dynamicaly
create (and destroy) kmsg-like devices which can be used by user space
for logging. Logging to kernel has number of benefits, including but not
limited to - always available, requiring no userspace, automatically
rotating and low overhead.

User-space logging to kernel cyclic buffers was already successfully used
in android logger concept but it had certain flaws that this commits try
to address:
* drops hardcoded number of devices and static paths in favor for dynamic
  configuration by ioctl interface in userspace
* extends existing driver instead of creating completely new one

Those patches apply on branch 'master',
(commit 9bdc771f2c29a11920f477fba05a58e23ee42554):
  git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

Marcin Niesluchowski (8):
  printk: move code regarding log message storing format
  printk: add one function for storing log in proper format
  kmsg: introduce additional kmsg devices support
  kmsg: add function for adding and deleting additional buffers
  kmsg: device support in mem class
  kmsg: add predefined _PID, _TID, _COMM keywords to kmsg* log dict
  kmsg: add ioctl for adding and deleting kmsg* devices
  kmsg: add ioctl for kmsg* devices operating on buffers

 Documentation/ioctl/ioctl-number.txt |    1 +
 drivers/char/mem.c                   |  154 +++-
 fs/proc/kmsg.c                       |    4 +-
 include/linux/printk.h               |    6 +
 include/uapi/linux/Kbuild            |    1 +
 include/uapi/linux/kmsg_ioctl.h      |   45 ++
 kernel/printk/printk.c               | 1361 ++++++++++++++++++++++------------
 7 files changed, 1087 insertions(+), 485 deletions(-)
 create mode 100644 include/uapi/linux/kmsg_ioctl.h

-- 

Best Regards,
Marcin Niesluchowski
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