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Message-ID: <BANLkTim7xn8tM4wTyd_m_nwUQg_CUTapeA@mail.gmail.com> Date: Mon, 23 May 2011 04:56:11 +0300 From: Lucian Adrian Grijincu <lucian.grijincu@...il.com> To: "Eric W . Biederman" <ebiederm@...ssion.com>, linux-kernel <linux-kernel@...r.kernel.org> Cc: netdev@...r.kernel.org, Lucian Adrian Grijincu <lucian.grijincu@...il.com>, Alexey Dobriyan <adobriyan@...il.com>, Octavian Purdila <tavi@...pub.ro>, "David S . Miller" <davem@...emloft.net> Subject: [v3 00/39] faster tree-based sysctl implementation Hi This is version 3 of a patch series that introduces a faster/leaner sysctl internal implementation. Due to high number of patches and low general interest I'll just point you to the tree/branch: git://github.com/luciang/linux-2.6-new-sysctl.git v3-new-sysctl-alg Patches are on top of v2.6.39. I did not pick a more recent (random) point in Linus' tree to rebase these onto to not mess up testing. Changes since v2 (http://thread.gmane.org/gmane.linux.kernel/1137032/focus=194748): - added a compatibility layer to support old registering complex sysctl trees. This layer will be deleted once all users of the old are changed. - subdirectories and netns correspondent dirs are now held in rbtrees - split of from the patches that make changes in the rest of the tree - rebased on top of 2.6.39 Changes since v1 (http://thread.gmane.org/gmane.linux.kernel/1133667): - rebased on top of 2.6.39-rc6 - split the patch that adds the new algorithm and data structures. - fixed a few bugs lingering in the old code - shrinked a reference counter - added a new reference counter to maintain ownership information - added method to register an empty sysctl dir and converted some users - added checks enforcing the rule that a non-netns specific directory may not be registered after a netns specific one has already been registered. - added cookie support: register a piece of data with the header to be used to make simple conversions on the ctl_table. This saves memory where we need to register sysctl tables with the same content affecting different pieces of data. - enforced sysctl checks $ time modprobe dummy numdummies=N NOTE: these stats are from v2. v3 should be a bit slower due to: - the compatibility layer - the old stats used cookies to prevent kmemdups() on ctl_table arrays - the old patches had an optimisation for directories with many subdirs that was replaced (in v3) with rbtrees Without this patch series :( - ipv4 only - N=1000 time= 0m 06s - N=2000 time= 0m 30s - N=4000 time= 2m 35s - ipv4 and ipv6 - N=1000 time= 0m 24s - N=2000 time= 2m 14s - N=4000 time=10m 16s - N=5000 time=16m 3s With this patch series :) - ipv4 only - N=1000 time= 0m 0.33s - N=2000 time= 0m 1.25s - N=4000 time= 0m 5.31s - ipv4 and ipv6 - N=1000 time= 0m 0.41s - N=2000 time= 0m 1.62s - N=4000 time= 0m 7.64s - N=5000 time= 0m 12.35s - N=8000 time= 0m 36.95s Patches marked with RFC: are patches where reviewers should pay more attention as I may have missed something. Part 1: introduce compatibility layer: sysctl: introduce temporary sysctl wrappers sysctl: register only tables of sysctl files Part 2: minimal changes to sysctl users: sysctl: call sysctl_init before the first sysctl registration sysctl: no-child: manually register kernel/random sysctl: no-child: manually register kernel/keys sysctl: no-child: manually register fs/inotify sysctl: no-child: manually register fs/epoll sysctl: no-child: manually register root tables Part 3: cleanups simplifying the new algorithm (created when asked to break up the new algorithm patch: sysctl: faster reimplementation of sysctl_check_table sysctl: remove useless ctl_table->parent field sysctl: simplify find_in_table sysctl: sysctl_head_grab defaults to root header on NULL sysctl: delete useless grab_header function sysctl: rename ->used to ->ctl_use_refs sysctl: rename sysctl_head_grab/finish to sysctl_use_header/unuse sysctl: rename sysctl_head_next to sysctl_use_next_header sysctl: split ->count into ctl_procfs_refs and ctl_header_refs sysctl: rename sysctl_head_get/put to sysctl_proc_inode_get/put sysctl: rename (un)use_table to __sysctl_(un)use_header sysctl: simplify ->permissions hook sysctl: group root-specific operations sysctl: introduce ctl_table_group sysctl: move removal from list out of start_unregistering Part 4: new algorithm/data structures: sysctl: faster tree-based sysctl implementation Part 5: checks/warns requested during review: sysctl: add duplicate entry and sanity ctl_table checks sysctl: alloc ctl_table_header with kmem_cache RFC: sysctl: change type of ctl_procfs_refs to u8 sysctl: check netns-specific registration order respected sysctl: warn if registration/unregistration order is not respected RFC: sysctl: always perform sysctl checks Part 6: Eric requested rbtrees for subdirs. I also used rbtrees for netns correspondent dirs. Hope that adding rbtrees after using the old list-based implementation is good enough. The rbtree code complicates things a bit and would uglify the patch adding the new algorithm. sysctl: reorder members of ctl_table_header (cleanup) sysctl: add ctl_type member RFC: sysctl: replace subdirectory list with rbtree RFC: sysctl: replace netns corresp list with rbtree sysctl: union-ize some ctl_table_header fields Part 7: Eric requested ability to register an empty dir: sysctl: add register_sysctl_dir: register an empty sysctl directory Part 8: unrequested feature I'd like to piggy back :) sysctl: add ctl_cookie and ctl_cookie_handler sysctl: add cookie to __register_sysctl_paths sysctl: add register_net_sysctl_table_net_cookie drivers/char/random.c | 27 +- fs/eventpoll.c | 22 +- fs/notify/inotify/inotify_user.c | 22 +- fs/proc/inode.c | 2 +- fs/proc/proc_sysctl.c | 233 +++++--- include/linux/inotify.h | 2 - include/linux/key.h | 3 - include/linux/poll.h | 2 - include/linux/sysctl.h | 221 +++++--- include/net/net_namespace.h | 4 +- init/main.c | 1 + kernel/Makefile | 5 +- kernel/sysctl.c | 1161 ++++++++++++++++++++++++++++---------- kernel/sysctl_check.c | 325 +++++++---- lib/Kconfig.debug | 8 - net/sysctl_net.c | 86 ++-- security/keys/key.c | 7 + security/keys/sysctl.c | 18 +- 18 files changed, 1495 insertions(+), 654 deletions(-) -- . ..: Lucian -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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