linux-kernel - [PATCH v2 0/5] kmod: help make deterministic

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Date:   Thu, 25 May 2017 17:16:25 -0700
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     akpm@...ux-foundation.org, jeyu@...hat.com, shuah@...nel.org,
        rusty@...tcorp.com.au, ebiederm@...ssion.com,
        dmitry.torokhov@...il.com, acme@...hat.com, corbet@....net
Cc:     martin.wilck@...e.com, mmarek@...e.com, pmladek@...e.com,
        hare@...e.com, rwright@....com, jeffm@...e.com, DSterba@...e.com,
        fdmanana@...e.com, neilb@...e.com, linux@...ck-us.net,
        rgoldwyn@...e.com, subashab@...eaurora.org, xypron.glpk@....de,
        keescook@...omium.org, atomlin@...hat.com, mbenes@...e.cz,
        paulmck@...ux.vnet.ibm.com, dan.j.williams@...el.com,
        jpoimboe@...hat.com, davem@...emloft.net, mingo@...hat.com,
        alan@...ux.intel.com, tytso@....edu, gregkh@...uxfoundation.org,
        torvalds@...ux-foundation.org, linux-kselftest@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Luis R. Rodriguez" <mcgrof@...nel.org>
Subject: [PATCH v2 0/5] kmod: help make deterministic

On this v2 I'm following Dmitry Torokhov's recommendation from the v1 series
[0] and I stop dancing around with work arounds and try to go straight for what
I think should be a proper fix for kmod: throttle instead of failing when kmod
max concurrent threshold is reached.

This patch series depends on the unsigned int range proc sysctl changes which
Andrew Morton recently merged into his -mm tree [1].

The kmod stress test driver uses a new license (GPL on Linux, copyleft-next
outside of Linux). Linus was fine with the copyleft-next so long as it was
clear GPL applies to Linux [2] and an or clause was used if I wanted to use
copyleft-next. Later based on discussions with Alan and Ted ironed out an "or"
language clause to use [3].

All code is also available on my 20170525-kmod-throttle branch of my linux-next
tree based on tag next-20170525 [4].

If there are any questions please let me know.

[0] https://lkml.kernel.org/r/20170519032444.18416-1-mcgrof@kernel.org
[1] https://lkml.kernel.org/r/20170519033554.18592-1-mcgrof@kernel.org
[2] https://lkml.kernel.org/r/CA+55aFyhxcvD+q7tp+-yrSFDKfR0mOHgyEAe=f_94aKLsOu0Og@mail.gmail.com
[3] https://lkml.kernel.org/r/1495234558.7848.122.camel@linux.intel.com
[4] https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/log/?h=20170525-kmod-throttle

  Luis

Luis R. Rodriguez (5):
  module: use list_for_each_entry_rcu() on find_module_all()
  kmod: reduce atomic operations on kmod_concurrent
  kmod: add test driver to stress test the module loader
  kmod: add helpers for getting kmod limit
  kmod: throttle kmod thread limit

 Documentation/sysctl/kernel.txt       |   20 +
 include/linux/kmod.h                  |    7 +
 init/main.c                           |    1 +
 kernel/kmod.c                         |   92 ++-
 kernel/module.c                       |    2 +-
 kernel/sysctl.c                       |    7 +
 lib/Kconfig.debug                     |   25 +
 lib/Makefile                          |    1 +
 lib/test_kmod.c                       | 1246 +++++++++++++++++++++++++++++++++
 tools/testing/selftests/kmod/Makefile |   11 +
 tools/testing/selftests/kmod/config   |    7 +
 tools/testing/selftests/kmod/kmod.sh  |  615 ++++++++++++++++
 12 files changed, 2004 insertions(+), 30 deletions(-)
 create mode 100644 lib/test_kmod.c
 create mode 100644 tools/testing/selftests/kmod/Makefile
 create mode 100644 tools/testing/selftests/kmod/config
 create mode 100755 tools/testing/selftests/kmod/kmod.sh

-- 
2.11.0