kernel_samsung_sm7125

jenna

Michal Hocko ce612879dd mm: move pcp and lru-pcp draining into single wq We currently have 2 specific WQ_RECLAIM workqueues in the mm code. vmstat_wq for updating pcp stats and lru_add_drain_wq dedicated to drain per cpu lru caches. This seems more than necessary because both can run on a single WQ. Both do not block on locks requiring a memory allocation nor perform any allocations themselves. We will save one rescuer thread this way. On the other hand drain_all_pages() queues work on the system wq which doesn't have rescuer and so this depend on memory allocation (when all workers are stuck allocating and new ones cannot be created). Initially we thought this would be more of a theoretical problem but Hugh Dickins has reported: : 4.11-rc has been giving me hangs after hours of swapping load. At : first they looked like memory leaks ("fork: Cannot allocate memory"); : but for no good reason I happened to do "cat /proc/sys/vm/stat_refresh" : before looking at /proc/meminfo one time, and the stat_refresh stuck : in D state, waiting for completion of flush_work like many kworkers. : kthreadd waiting for completion of flush_work in drain_all_pages(). This worker should be using WQ_RECLAIM as well in order to guarantee a forward progress. We can reuse the same one as for lru draining and vmstat. Link: http://lkml.kernel.org/r/20170307131751.24936-1-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Suggested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Mel Gorman <mgorman@suse.de> Tested-by: Yang Li <pku.leo@gmail.com> Tested-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		8 years ago
Documentation	Merge branch 'akpm' (patches from Andrew)	8 years ago
arch	arm64 fixes:	8 years ago
block	blk-mq: include errors in did_work calculation	8 years ago
certs	…
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	8 years ago
drivers	- Two stable@ fixes for the verity target's FEC support	8 years ago
firmware	…
fs	dax: fix radix tree insertion race	8 years ago
include	vmlinux.lds: add missing VMLINUX_SYMBOL macros	8 years ago
init	mm: move mm_percpu_wq initialization earlier	8 years ago
ipc	Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	8 years ago
kernel	ptrace: fix PTRACE_LISTEN race corrupting task->state	8 years ago
lib	Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	8 years ago
mm	mm: move pcp and lru-pcp draining into single wq	8 years ago
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	8 years ago
samples	Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	8 years ago
scripts	Kbuild fixes for v4.11	8 years ago
security	Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	8 years ago
sound	ALSA: hda - fix a problem for lineout on a Dell AIO machine	8 years ago
tools	bpf: add various verifier test cases for self-tests	8 years ago
usr	kbuild: initramfs cleanup, set target from Kconfig	8 years ago
virt	KVM: pci-assign: do not map smm memory slot pages in vt-d page tables	8 years ago
.cocciconfig	…
.get_maintainer.ignore	…
.gitattributes	.gitattributes: set git diff driver for C source code files	8 years ago
.gitignore	Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	9 years ago
.mailmap	mailmap: update Yakir Yang email address	8 years ago
COPYING	…
CREDITS	MAINTAINERS: Remove old e-mail address	8 years ago
Kbuild	…
Kconfig	…
MAINTAINERS	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	8 years ago
Makefile	Kbuild fixes for v4.11	8 years ago
README	README: add a new README file, pointing to the Documentation/	8 years ago

README

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.