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Message-ID: <ZPhpedWW6RwTd9Hf@example.org>
Date: Wed, 6 Sep 2023 13:58:49 +0200
From: Alexey Gladkov <legion@...nel.org>
To: Luis Chamberlain <mcgrof@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Joel Granados <joel.granados@...il.com>,
linux-fsdevel@...r.kernel.org, rds-devel@....oracle.com,
"David S. Miller" <davem@...emloft.net>,
Florian Westphal <fw@...len.de>, willy@...radead.org,
Jan Karcher <jaka@...ux.ibm.com>,
Wen Gu <guwen@...ux.alibaba.com>,
Simon Horman <horms@...ge.net.au>,
Tony Lu <tonylu@...ux.alibaba.com>, linux-wpan@...r.kernel.org,
Matthieu Baerts <matthieu.baerts@...sares.net>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
mptcp@...ts.linux.dev, Heiko Carstens <hca@...ux.ibm.com>,
Stefan Schmidt <stefan@...enfreihafen.org>,
Will Deacon <will@...nel.org>, Julian Anastasov <ja@....bg>,
netfilter-devel@...r.kernel.org, Joerg Reuter <jreuter@...na.de>,
linux-kernel@...r.kernel.org,
Alexander Gordeev <agordeev@...ux.ibm.com>,
linux-sctp@...r.kernel.org, Xin Long <lucien.xin@...il.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
linux-hams@...r.kernel.org, Vasily Gorbik <gor@...ux.ibm.com>,
coreteam@...filter.org, Ralf Baechle <ralf@...ux-mips.org>,
Steffen Klassert <steffen.klassert@...unet.com>,
Pablo Neira Ayuso <pablo@...filter.org>,
keescook@...omium.org, Roopa Prabhu <roopa@...dia.com>,
David Ahern <dsahern@...nel.org>,
linux-arm-kernel@...ts.infradead.org,
Catalin Marinas <catalin.marinas@....com>,
Jozsef Kadlecsik <kadlec@...filter.org>,
Wenjia Zhang <wenjia@...ux.ibm.com>, josh@...htriplett.org,
Alexander Aring <alex.aring@...il.com>,
Nikolay Aleksandrov <razor@...ckwall.org>,
netdev@...r.kernel.org,
Santosh Shilimkar <santosh.shilimkar@...cle.com>,
linux-s390@...r.kernel.org, Sven Schnelle <svens@...ux.ibm.com>,
"D. Wythe" <alibuda@...ux.alibaba.com>,
Eric Dumazet <edumazet@...gle.com>, lvs-devel@...r.kernel.org,
linux-rdma@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
Iurii Zaikin <yzaikin@...gle.com>,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
bridge@...ts.linux-foundation.org,
Karsten Graul <kgraul@...ux.ibm.com>,
Mat Martineau <martineau@...nel.org>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Jakub Kicinski <kuba@...nel.org>,
Joel Granados <j.granados@...sung.com>
Subject: Re: [GIT PULL] sysctl changes for v6.6-rc1
On Tue, Aug 29, 2023 at 01:44:55PM -0700, Luis Chamberlain wrote:
> The following changes since commit 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5:
>
> Linux 6.5-rc1 (2023-07-09 13:53:13 -0700)
>
> are available in the Git repository at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git/ tags/sysctl-6.6-rc1
>
> for you to fetch changes up to 53f3811dfd5e39507ee3aaea1be09aabce8f9c98:
>
> sysctl: Use ctl_table_size as stopping criteria for list macro (2023-08-15 15:26:18 -0700)
>
> ----------------------------------------------------------------
> sysctl-6.6-rc1
>
> Long ago we set out to remove the kitchen sink on kernel/sysctl.c arrays and
> placings sysctls to their own sybsystem or file to help avoid merge conflicts.
> Matthew Wilcox pointed out though that if we're going to do that we might as
> well also *save* space while at it and try to remove the extra last sysctl
> entry added at the end of each array, a sentintel, instead of bloating the
> kernel by adding a new sentinel with each array moved.
>
> Doing that was not so trivial, and has required slowing down the moves of
> kernel/sysctl.c arrays and measuring the impact on size by each new move.
>
> The complex part of the effort to help reduce the size of each sysctl is being
> done by the patient work of el señor Don Joel Granados. A lot of this is truly
> painful code refactoring and testing and then trying to measure the savings of
> each move and removing the sentinels. Although Joel already has code which does
> most of this work, experience with sysctl moves in the past shows is we need to
> be careful due to the slew of odd build failures that are possible due to the
> amount of random Kconfig options sysctls use.
>
> To that end Joel's work is split by first addressing the major housekeeping
> needed to remove the sentinels, which is part of this merge request. The rest
> of the work to actually remove the sentinels will be done later in future
> kernel releases.
This is very interesting for me. I'm also refactoring sysctl based on
discussion with Linus a while ago.
Could you please add me to the Cc in the next patches?
> At first I was only going to send his first 7 patches of his patch series,
> posted 1 month ago, but in retrospect due to the testing the changes have
> received in linux-next and the minor changes they make this goes with the
> entire set of patches Joel had planned: just sysctl house keeping. There are
> networking changes but these are part of the house keeping too.
>
> The preliminary math is showing this will all help reduce the overall build
> time size of the kernel and run time memory consumed by the kernel by about
> ~64 bytes per array where we are able to remove each sentinel in the future.
> That also means there is no more bloating the kernel with the extra ~64 bytes
> per array moved as no new sentinels are created.
>
> Most of this has been in linux-next for about a month, the last 7 patches took
> a minor refresh 2 week ago based on feedback.
>
> ----------------------------------------------------------------
> Joel Granados (14):
> sysctl: Prefer ctl_table_header in proc_sysctl
> sysctl: Use ctl_table_header in list_for_each_table_entry
> sysctl: Add ctl_table_size to ctl_table_header
> sysctl: Add size argument to init_header
> sysctl: Add a size arg to __register_sysctl_table
> sysctl: Add size to register_sysctl
> sysctl: Add size arg to __register_sysctl_init
> sysctl: Add size to register_net_sysctl function
> ax.25: Update to register_net_sysctl_sz
> netfilter: Update to register_net_sysctl_sz
> networking: Update to register_net_sysctl_sz
> vrf: Update to register_net_sysctl_sz
> sysctl: SIZE_MAX->ARRAY_SIZE in register_net_sysctl
> sysctl: Use ctl_table_size as stopping criteria for list macro
>
> arch/arm64/kernel/armv8_deprecated.c | 2 +-
> arch/s390/appldata/appldata_base.c | 2 +-
> drivers/net/vrf.c | 3 +-
> fs/proc/proc_sysctl.c | 90 +++++++++++++++++----------------
> include/linux/sysctl.h | 31 +++++++++---
> include/net/ipv6.h | 2 +
> include/net/net_namespace.h | 10 ++--
> ipc/ipc_sysctl.c | 4 +-
> ipc/mq_sysctl.c | 4 +-
> kernel/ucount.c | 5 +-
> net/ax25/sysctl_net_ax25.c | 3 +-
> net/bridge/br_netfilter_hooks.c | 3 +-
> net/core/neighbour.c | 8 ++-
> net/core/sysctl_net_core.c | 3 +-
> net/ieee802154/6lowpan/reassembly.c | 8 ++-
> net/ipv4/devinet.c | 3 +-
> net/ipv4/ip_fragment.c | 3 +-
> net/ipv4/route.c | 8 ++-
> net/ipv4/sysctl_net_ipv4.c | 3 +-
> net/ipv4/xfrm4_policy.c | 3 +-
> net/ipv6/addrconf.c | 3 +-
> net/ipv6/icmp.c | 5 ++
> net/ipv6/netfilter/nf_conntrack_reasm.c | 3 +-
> net/ipv6/reassembly.c | 3 +-
> net/ipv6/route.c | 9 ++++
> net/ipv6/sysctl_net_ipv6.c | 16 ++++--
> net/ipv6/xfrm6_policy.c | 3 +-
> net/mpls/af_mpls.c | 6 ++-
> net/mptcp/ctrl.c | 3 +-
> net/netfilter/ipvs/ip_vs_ctl.c | 8 ++-
> net/netfilter/ipvs/ip_vs_lblc.c | 10 ++--
> net/netfilter/ipvs/ip_vs_lblcr.c | 10 ++--
> net/netfilter/nf_conntrack_standalone.c | 4 +-
> net/netfilter/nf_log.c | 7 +--
> net/rds/tcp.c | 3 +-
> net/sctp/sysctl.c | 4 +-
> net/smc/smc_sysctl.c | 3 +-
> net/sysctl_net.c | 26 +++++++---
> net/unix/sysctl_net_unix.c | 3 +-
> net/xfrm/xfrm_sysctl.c | 8 ++-
> 40 files changed, 222 insertions(+), 113 deletions(-)
--
Rgrds, legion
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