linux-next

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Mainline Linux tree for various devices, only for fun :)

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Mel Gorman 8b10b465d0 mm/page_alloc: free pages in a single pass during bulk free free_pcppages_bulk() has taken two passes through the pcp lists since commit `0a5f4e5b45` ("mm/free_pcppages_bulk: do not hold lock when picking pages to free") due to deferring the cost of selecting PCP lists until the zone lock is held. Now that list selection is simplier, the main cost during selection is bulkfree_pcp_prepare() which in the normal case is a simple check and prefetching. As the list manipulations have cost in itself, go back to freeing pages in a single pass. The series up to this point was evaulated using a trunc microbenchmark that is truncating sparse files stored in page cache (mmtests config config-io-trunc). Sparse files were used to limit filesystem interaction. The results versus a revert of storing high-order pages in the PCP lists is 1-socket Skylake 5.17.0-rc3 5.17.0-rc3 5.17.0-rc3 vanilla mm-reverthighpcp-v1 mm-highpcpopt-v2 Min elapsed 540.00 ( 0.00%) 530.00 ( 1.85%) 530.00 ( 1.85%) Amean elapsed 543.00 ( 0.00%) 530.00 * 2.39%* 530.00 * 2.39%* Stddev elapsed 4.83 ( 0.00%) 0.00 ( 100.00%) 0.00 ( 100.00%) CoeffVar elapsed 0.89 ( 0.00%) 0.00 ( 100.00%) 0.00 ( 100.00%) Max elapsed 550.00 ( 0.00%) 530.00 ( 3.64%) 530.00 ( 3.64%) BAmean-50 elapsed 540.00 ( 0.00%) 530.00 ( 1.85%) 530.00 ( 1.85%) BAmean-95 elapsed 542.22 ( 0.00%) 530.00 ( 2.25%) 530.00 ( 2.25%) BAmean-99 elapsed 542.22 ( 0.00%) 530.00 ( 2.25%) 530.00 ( 2.25%) 2-socket CascadeLake 5.17.0-rc3 5.17.0-rc3 5.17.0-rc3 vanilla mm-reverthighpcp-v1 mm-highpcpopt-v2 Min elapsed 510.00 ( 0.00%) 500.00 ( 1.96%) 500.00 ( 1.96%) Amean elapsed 529.00 ( 0.00%) 521.00 ( 1.51%) 510.00 * 3.59%* Stddev elapsed 16.63 ( 0.00%) 12.87 ( 22.64%) 11.55 ( 30.58%) CoeffVar elapsed 3.14 ( 0.00%) 2.47 ( 21.46%) 2.26 ( 27.99%) Max elapsed 550.00 ( 0.00%) 540.00 ( 1.82%) 530.00 ( 3.64%) BAmean-50 elapsed 516.00 ( 0.00%) 512.00 ( 0.78%) 500.00 ( 3.10%) BAmean-95 elapsed 526.67 ( 0.00%) 518.89 ( 1.48%) 507.78 ( 3.59%) BAmean-99 elapsed 526.67 ( 0.00%) 518.89 ( 1.48%) 507.78 ( 3.59%) The original motivation for multi-passes was will-it-scale page_fault1 using $nr_cpu processes. 2-socket CascadeLake (40 cores, 80 CPUs HT enabled) 5.17.0-rc3 5.17.0-rc3 vanilla mm-highpcpopt-v2 Hmean page_fault1-processes-2 2694662.26 ( 0.00%) 2695780.35 ( 0.04%) Hmean page_fault1-processes-5 6425819.34 ( 0.00%) 6435544.57 * 0.15%* Hmean page_fault1-processes-8 9642169.10 ( 0.00%) 9658962.39 ( 0.17%) Hmean page_fault1-processes-12 12167502.10 ( 0.00%) 12190163.79 ( 0.19%) Hmean page_fault1-processes-21 15636859.03 ( 0.00%) 15612447.26 ( -0.16%) Hmean page_fault1-processes-30 25157348.61 ( 0.00%) 25169456.65 ( 0.05%) Hmean page_fault1-processes-48 27694013.85 ( 0.00%) 27671111.46 ( -0.08%) Hmean page_fault1-processes-79 25928742.64 ( 0.00%) 25934202.02 ( 0.02%) <-- Hmean page_fault1-processes-110 25730869.75 ( 0.00%) 25671880.65 * -0.23%* Hmean page_fault1-processes-141 25626992.42 ( 0.00%) 25629551.61 ( 0.01%) Hmean page_fault1-processes-172 25611651.35 ( 0.00%) 25614927.99 ( 0.01%) Hmean page_fault1-processes-203 25577298.75 ( 0.00%) 25583445.59 ( 0.02%) Hmean page_fault1-processes-234 25580686.07 ( 0.00%) 25608240.71 ( 0.11%) Hmean page_fault1-processes-265 25570215.47 ( 0.00%) 25568647.58 ( -0.01%) Hmean page_fault1-processes-296 25549488.62 ( 0.00%) 25543935.00 ( -0.02%) Hmean page_fault1-processes-320 25555149.05 ( 0.00%) 25575696.74 ( 0.08%) The differences are mostly within the noise and the difference close to $nr_cpus is negligible. Link: https://lkml.kernel.org/r/20220217002227.5739-6-mgorman@techsingularity.net Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Tested-by: Aaron Lu <aaron.lu@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Michal Hocko <mhocko@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2022-03-22 15:57:06 -07:00
arch	cma: factor out minimum alignment requirement	2022-03-22 15:57:05 -07:00
block	fs: allocate inode by using alloc_inode_sb()	2022-03-22 15:57:03 -07:00
certs	certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty	2022-01-23 00:08:44 +09:00
crypto	crypto: af_alg - get rid of alg_memory_allocated	2022-02-15 14:29:04 +00:00
Documentation	fs: introduce alloc_inode_sb() to allocate filesystems specific inode	2022-03-22 15:57:03 -07:00
drivers	mm: enforce pageblock_order < MAX_ORDER	2022-03-22 15:57:06 -07:00
fs	mm: dcache: use kmem_cache_alloc_lru() to allocate dentry	2022-03-22 15:57:03 -07:00
include	mm: enforce pageblock_order < MAX_ORDER	2022-03-22 15:57:06 -07:00
init	lib/stackdepot: allow optional init and stack_table allocation by kvmalloc()	2022-01-22 08:33:37 +02:00
ipc	fs: allocate inode by using alloc_inode_sb()	2022-03-22 15:57:03 -07:00
kernel	cma: factor out minimum alignment requirement	2022-03-22 15:57:05 -07:00
lib	xarray: use kmem_cache_alloc_lru to allocate xa_node	2022-03-22 15:57:03 -07:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	mm/page_alloc: free pages in a single pass during bulk free	2022-03-22 15:57:06 -07:00
net	fs: allocate inode by using alloc_inode_sb()	2022-03-22 15:57:03 -07:00
samples	samples/seccomp: Adjust sample to also provide kill option	2022-02-10 19:09:12 -08:00
scripts	scripts/spelling.txt: add more spellings to spelling.txt	2022-03-22 15:57:00 -07:00
security	selinux/stable-5.17 PR 20220223	2022-02-23 17:19:55 -08:00
sound	ALSA: intel_hdmi: Fix reference to PCM buffer address	2022-03-02 09:25:37 +01:00
tools	selftests, x86: fix how check_cc.sh is being invoked	2022-03-22 15:57:04 -07:00
usr	kbuild: remove include/linux/cyclades.h from header file check	2022-01-27 08:51:08 +01:00
virt	KVM: Fix lockdep false negative during host resume	2022-02-17 09:52:50 -05:00
.clang-format	genirq/msi: Make interrupt allocation less convoluted	2021-12-16 22:22:20 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	.gitignore: ignore only top-level modules.builtin	2021-05-02 00:43:35 +09:00
.mailmap	MAINTAINERS: Update Jisheng's email address	2022-03-08 17:30:32 +01:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: replace a Microchip AT91 maintainer	2022-02-09 11:30:01 +01:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	Add Paolo Abeni to networking maintainers	2022-03-15 12:16:10 -07:00
Makefile	Linux 5.17	2022-03-20 13:14:17 -07:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

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.

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.