[RFC 0/8] Additional kmsg devices

Marcin Niesluchowski
2015-07-03T10:53:35Z

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