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    Subject[Review][PATCH][0/29] sysctl rewrite for speed and clarity

    The problem:

    The current implementation of sysctl has data structures and semantics
    that are hard to understand, and causes sysctl to run slowly.
    Sysctl running slowly is a scaling problem in general and the network
    stack in particular.

    After some heavy testing and way way too much patch rewriting I believe I
    have a patchset that seems sane and reasonable and gets to what looks to
    my weary eyes a sane result.

    My patchset was heavily inspired by the previous work done by Lucian
    Grinjincu. Lucian kept the need for this work alive, and did a much
    better job than I ever though he did. Unfortunately I missed a lot
    of the good things Lucian did my rushed attempts at code review.

    This code is also available at:

    Eric W. Biederman (28):
    sysctl: Consolidate !CONFIG_SYSCTL handling
    sysctl: Register the base sysctl table like any other sysctl table.
    sysctl: Move the implementation into fs/proc/proc_sysctl.c
    sysctl: Make the directories have nlink == 1
    sysctl: Implement retire_sysctl_set
    sysctl: Remove the unnecessary sysctl_set parent concept.
    sysctl: Create local copies of directory names used in paths
    sysctl: Add support for register sysctl tables with a normal cstring path.
    sysctl: Add ctl_table chains into cstring paths
    sysctl: register only tables of sysctl files
    sysctl: Improve the sysctl sanity checks
    sysctl: Remove the now unused ctl_table parent field.
    sysctl: A more obvious version of grab_header.
    sysctl: Initial support for auto-unregistering sysctl tables.
    sysctl: Factor out init_header from __register_sysctl_paths
    sysctl: Factor out insert_header and erase_header
    sysctl: Normalize the root_table data structure.
    sysctl: Rewrite proc_sys_lookup introducing find_entry and lookup_entry.
    sysctl: Rewrite proc_sys_readdir in terms of first_entry and next_entry
    sysctl: Add a root pointer to ctl_table_set
    sysctl: Stop requiring explicit management of sysctl directories
    sysctl: Add sysctl_print_dir and use it in get_subdir
    sysctl: Replace root_list with links between sysctl_table_sets.
    sysctl: Modify __register_sysctl_paths to take a set instead of a root and an nsproxy
    sysctl: Move sysctl_check_dups into insert_header
    sysctl: Make the header lists per directory.
    sysctl: Index sysctl directories with rbtrees.
    sysctl: Add register_sysctl for normal sysctl users

    Lucas De Marchi (1):
    sysctl: remove impossible condition check

    fs/proc/internal.h | 3 +
    fs/proc/proc_sysctl.c | 1240 +++++++++++++++++++++++++++++++++++++++++++++---
    include/linux/sysctl.h | 106 +++--
    kernel/Makefile | 1 -
    kernel/sysctl.c | 501 +-------------------
    kernel/sysctl_check.c | 160 -------
    lib/Kconfig.debug | 8 -
    net/sysctl_net.c | 24 +-
    8 files changed, 1247 insertions(+), 796 deletions(-)


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