android_kernel_motorola_sm6375

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Filename	Latest commit message	Latest commit date
Phil Auld baa9be4ffb sched/fair: Fix throttle_list starvation with low CFS quota With a very low cpu.cfs_quota_us setting, such as the minimum of 1000, distribute_cfs_runtime may not empty the throttled_list before it runs out of runtime to distribute. In that case, due to the change from `c06f04c704` to put throttled entries at the head of the list, later entries on the list will starve. Essentially, the same X processes will get pulled off the list, given CPU time and then, when expired, get put back on the head of the list where distribute_cfs_runtime will give runtime to the same set of processes leaving the rest. Fix the issue by setting a bit in struct cfs_bandwidth when distribute_cfs_runtime is running, so that the code in throttle_cfs_rq can decide to put the throttled entry on the tail or the head of the list. The bit is set/cleared by the callers of distribute_cfs_runtime while they hold cfs_bandwidth->lock. This is easy to reproduce with a handful of CPU consumers. I use 'crash' on the live system. In some cases you can simply look at the throttled list and see the later entries are not changing: crash> list cfs_rq.throttled_list -H 0xffff90b54f6ade40 -s cfs_rq.runtime_remaining \| paste - - \| awk '{print $1" "$4}' \| pr -t -n3 1 ffff90b56cb2d200 -976050 2 ffff90b56cb2cc00 -484925 3 ffff90b56cb2bc00 -658814 4 ffff90b56cb2ba00 -275365 5 ffff90b166a45600 -135138 6 ffff90b56cb2da00 -282505 7 ffff90b56cb2e000 -148065 8 ffff90b56cb2fa00 -872591 9 ffff90b56cb2c000 -84687 10 ffff90b56cb2f000 -87237 11 ffff90b166a40a00 -164582 crash> list cfs_rq.throttled_list -H 0xffff90b54f6ade40 -s cfs_rq.runtime_remaining \| paste - - \| awk '{print $1" "$4}' \| pr -t -n3 1 ffff90b56cb2d200 -994147 2 ffff90b56cb2cc00 -306051 3 ffff90b56cb2bc00 -961321 4 ffff90b56cb2ba00 -24490 5 ffff90b166a45600 -135138 6 ffff90b56cb2da00 -282505 7 ffff90b56cb2e000 -148065 8 ffff90b56cb2fa00 -872591 9 ffff90b56cb2c000 -84687 10 ffff90b56cb2f000 -87237 11 ffff90b166a40a00 -164582 Sometimes it is easier to see by finding a process getting starved and looking at the sched_info: crash> task ffff8eb765994500 sched_info PID: 7800 TASK: ffff8eb765994500 CPU: 16 COMMAND: "cputest" sched_info = { pcount = 8, run_delay = 697094208, last_arrival = 240260125039, last_queued = 240260327513 }, crash> task ffff8eb765994500 sched_info PID: 7800 TASK: ffff8eb765994500 CPU: 16 COMMAND: "cputest" sched_info = { pcount = 8, run_delay = 697094208, last_arrival = 240260125039, last_queued = 240260327513 }, Signed-off-by: Phil Auld <pauld@redhat.com> Reviewed-by: Ben Segall <bsegall@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Fixes: `c06f04c704` ("sched: Fix potential near-infinite distribute_cfs_runtime() loop") Link: http://lkml.kernel.org/r/20181008143639.GA4019@pauld.bos.csb Signed-off-by: Ingo Molnar <mingo@kernel.org>		2018-10-11 13:10:18 +02:00
arch	powerpc fixes for 4.19 #4	2018-10-07 07:05:43 +02:00
block	blk-mq: I/O and timer unplugs are inverted in blktrace	2018-09-27 13:12:44 -06:00
certs
crypto
Documentation	Char/Misc fixes for 4.19-rc7	2018-10-07 08:15:57 +02:00
drivers	Char/Misc fixes for 4.19-rc7	2018-10-07 08:15:57 +02:00
firmware
fs	ocfs2: fix locking for res->tracking and dlm->tracking_list	2018-10-05 16:32:05 -07:00
include	mm, sched/numa: Remove remaining traces of NUMA rate-limiting	2018-10-09 08:30:51 +02:00
init
ipc	ipc/shm.c: use ERR_CAST() for shm_lock() error return	2018-10-05 16:32:04 -07:00
kernel	sched/fair: Fix throttle_list starvation with low CFS quota	2018-10-11 13:10:18 +02:00
lib	lib/xz: Put CRC32_POLY_LE in xz_private.h	2018-10-02 08:44:59 +10:00
LICENSES
mm	mm, sched/numa: Remove remaining traces of NUMA rate-limiting	2018-10-09 08:30:51 +02:00
net	ipv6: take rcu lock in rawv6_send_hdrinc()	2018-10-05 14:45:34 -07:00
samples
scripts	linux-kselftest-4.19-rc5	2018-09-17 07:24:28 +02:00
security	Revert "uapi/linux/keyctl.h: don't use C++ reserved keyword as a struct member name"	2018-09-25 13:28:58 +02:00
sound	ALSA: hda/realtek - Cannot adjust speaker's volume on Dell XPS 27 7760	2018-10-04 07:50:48 +02:00
tools	Char/Misc fixes for 4.19-rc7	2018-10-07 08:15:57 +02:00
usr
virt	KVM: Remove obsolete kvm_unmap_hva notifier backend	2018-09-07 15:06:02 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	pci-v4.19-fixes-3	2018-10-05 16:11:16 -07:00
Makefile	Linux 4.19-rc7	2018-10-07 17:26:02 +02:00
README

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.
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.