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Filename Latest commit message Latest commit date
Ilya Dryomov 7b4c443d13 libceph: reschedule a tick in finish_hunting()
If we go without an established session for a while, backoff delay will
climb to 30 seconds.  The keepalive timeout is also 30 seconds, so it's
pretty easily hit after a prolonged hunting for a monitor: we don't get
a chance to send out a keepalive in time, which means we never get back
a keepalive ack in time, cutting an established session and attempting
to connect to a different monitor every 30 seconds:

  [Sun Apr 1 23:37:05 2018] libceph: mon0 10.80.20.99:6789 session established
  [Sun Apr 1 23:37:36 2018] libceph: mon0 10.80.20.99:6789 session lost, hunting for new mon
  [Sun Apr 1 23:37:36 2018] libceph: mon2 10.80.20.103:6789 session established
  [Sun Apr 1 23:38:07 2018] libceph: mon2 10.80.20.103:6789 session lost, hunting for new mon
  [Sun Apr 1 23:38:07 2018] libceph: mon1 10.80.20.100:6789 session established
  [Sun Apr 1 23:38:37 2018] libceph: mon1 10.80.20.100:6789 session lost, hunting for new mon
  [Sun Apr 1 23:38:37 2018] libceph: mon2 10.80.20.103:6789 session established
  [Sun Apr 1 23:39:08 2018] libceph: mon2 10.80.20.103:6789 session lost, hunting for new mon

The regular keepalive interval is 10 seconds.  After ->hunting is
cleared in finish_hunting(), call __schedule_delayed() to ensure we
send out a keepalive after 10 seconds.

Cc: stable@vger.kernel.org # 4.7+
Link: http://tracker.ceph.com/issues/23537
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2018-04-24 10:40:21 +02:00
arch Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-04-22 11:40:52 -07:00
block
certs
crypto
Documentation Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal 2018-04-20 10:56:32 -07:00
drivers exynos, i915, vc4, amdgpu fixes 2018-04-22 17:14:29 -07:00
firmware
fs ceph: check if mds create snaprealm when setting quota 2018-04-23 17:35:19 +02:00
include exynos, i915, vc4, amdgpu fixes 2018-04-22 17:14:29 -07:00
init
ipc
kernel Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-04-22 10:49:02 -07:00
lib
LICENSES
mm mm/filemap.c: fix NULL pointer in page_cache_tree_insert() 2018-04-20 17:18:36 -07:00
net libceph: reschedule a tick in finish_hunting() 2018-04-24 10:40:21 +02:00
samples
scripts
security
sound sound fixes for 4.17-rc2 2018-04-21 10:32:16 -07:00
tools Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-04-22 10:17:01 -07:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 2018-04-21 21:11:05 -07:00
Makefile Linux 4.17-rc2 2018-04-22 19:20:09 -07:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.