Johannes Weiner
3bbcbc8039
UPSTREAM: psi: make disabling/enabling easier for vendor kernels ...
Mel Gorman reports a hackbench regression with psi that would prohibit
shipping the suse kernel with it default-enabled, but he'd still like
users to be able to opt in at little to no cost to others.
With the current combination of CONFIG_PSI and the psi_disabled bool set
from the commandline, this is a challenge. Do the following things to
make it easier:
1. Add a config option CONFIG_PSI_DEFAULT_DISABLED that allows distros
to enable CONFIG_PSI in their kernel but leave the feature disabled
unless a user requests it at boot-time.
To avoid double negatives, rename psi_disabled= to psi=.
2. Make psi_disabled a static branch to eliminate any branch costs
when the feature is disabled.
In terms of numbers before and after this patch, Mel says:
: The following is a comparision using CONFIG_PSI=n as a baseline against
: your patch and a vanilla kernel
:
: 4.20.0-rc4 4.20.0-rc4 4.20.0-rc4
: kconfigdisable-v1r1 vanilla psidisable-v1r1
: Amean 1 1.3100 ( 0.00%) 1.3923 ( -6.28%) 1.3427 ( -2.49%)
: Amean 3 3.8860 ( 0.00%) 4.1230 * -6.10%* 3.8860 ( -0.00%)
: Amean 5 6.8847 ( 0.00%) 8.0390 * -16.77%* 6.7727 ( 1.63%)
: Amean 7 9.9310 ( 0.00%) 10.8367 * -9.12%* 9.9910 ( -0.60%)
: Amean 12 16.6577 ( 0.00%) 18.2363 * -9.48%* 17.1083 ( -2.71%)
: Amean 18 26.5133 ( 0.00%) 27.8833 * -5.17%* 25.7663 ( 2.82%)
: Amean 24 34.3003 ( 0.00%) 34.6830 ( -1.12%) 32.0450 ( 6.58%)
: Amean 30 40.0063 ( 0.00%) 40.5800 ( -1.43%) 41.5087 ( -3.76%)
: Amean 32 40.1407 ( 0.00%) 41.2273 ( -2.71%) 39.9417 ( 0.50%)
:
: It's showing that the vanilla kernel takes a hit (as the bisection
: indicated it would) and that disabling PSI by default is reasonably
: close in terms of performance for this particular workload on this
: particular machine so;
Link: http://lkml.kernel.org/r/20181127165329.GA29728@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Mel Gorman <mgorman@techsingularity.net>
Reported-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit e0c274472d5d27f277af722e017525e0b33784cd)
Bug: 127712811
Test: lmkd in PSI mode
Change-Id: I6cb666fa351e8901df82e4d6931bfec0c5ce230d
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
2019-03-21 16:25:27 -07:00
bpf: Fix syscall's stackmap lookup potential deadlock
2019-03-13 14:02:36 -07:00
UPSTREAM: psi: cgroup support
2019-03-21 16:25:27 -07:00
kconfig: tinyconfig: remove stale stack protector fixups
2018-06-15 07:15:28 +09:00
BACKPORT: sched: loadavg: consolidate LOAD_INT, LOAD_FRAC, CALC_LOAD
2019-03-21 16:25:26 -07:00
dma-direct: do not include SME mask in the DMA supported check
2019-01-13 09:51:05 +01:00
This is the 4.19.29 stable release
2019-03-13 14:17:29 -07:00
gcov: remove CONFIG_GCOV_FORMAT_AUTODETECT
2018-06-08 18:56:02 +09:00
genirq: Make sure the initial affinity is not empty
2019-03-05 17:58:47 +01:00
Merge branch 'for-4.19/upstream' into for-linus
2018-08-20 18:33:50 +02:00
locking/rwsem: Fix (possible) missed wakeup
2019-03-05 17:58:49 +01:00
FROMGIT: PM / EM: Expose the Energy Model in debugfs
2019-01-28 17:05:00 +00:00
printk: Fix panic caused by passing log_buf_len to command line
2018-11-13 11:08:48 -08:00
srcu: Lock srcu_data structure in srcu_gp_start()
2019-01-13 09:51:06 +01:00
UPSTREAM: psi: make disabling/enabling easier for vendor kernels
2019-03-21 16:25:27 -07:00
timekeeping: Use proper seqcount initializer
2019-02-12 19:47:05 +01:00
bpf: fix potential deadlock in bpf_prog_register
2019-03-13 14:02:36 -07:00
kernel/async.c: revert "async: simplify lowest_in_progress()"
2018-02-06 18:32:44 -08:00
audit: use ktime_get_coarse_real_ts64() for timestamps
2018-07-17 14:45:08 -04:00
audit: track the owner of the command mutex ourselves
2018-02-23 11:22:22 -05:00
fsnotify: add fsnotify_add_inode_mark() wrappers
2018-05-18 14:58:22 +02:00
\n
2018-08-17 09:41:28 -07:00
audit: fix use-after-free in audit_add_watch
2018-07-18 11:43:36 -04:00
audit: rename FILTER_TYPE to FILTER_EXCLUDE
2018-06-19 10:39:54 -04:00
audit/stable-4.18 PR 20180814
2018-08-15 10:46:54 -07:00
kbuild: fix kernel/bounds.c 'W=1' warning
2018-11-13 11:08:47 -08:00
time: Enable get/put_compat_itimerspec64 always
2018-06-24 14:39:47 +02:00
This is the 4.19.21 stable release
2019-02-12 20:37:21 +01:00
kernel/crash_core.c: print timestamp using time64_t
2018-08-22 10:52:47 -07:00
UPSTREAM: delayacct: track delays from thrashing cache pages
2019-03-21 16:25:26 -07:00
proc: introduce proc_create_single{,_data}
2018-05-16 07:23:35 +02:00
proc: introduce proc_create_single{,_data}
2018-05-16 07:23:35 +02:00
sched/wait: Fix rcuwait_wake_up() ordering
2019-03-05 17:58:49 +01:00
extable: Make init_kernel_text() global
2018-02-21 16:54:06 +01:00
bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe
2018-06-21 12:33:19 +02:00
UPSTREAM: psi: pressure stall information for CPU, memory, and IO
2019-03-21 16:25:27 -07:00
PM / reboot: Eliminate race between reboot and suspend
2018-08-06 12:35:20 +02:00
futex: Fix (possible) missed wakeup
2019-03-05 17:58:49 +01:00
kernel/hung_task.c: force console verbose before panic
2019-02-12 19:47:19 +01:00
memremap: split devm_memremap_pages() and memremap() infrastructure
2018-05-15 23:08:33 -07:00
jump_label: Fix typo in warning message
2018-09-10 10:15:48 +02:00
kallsyms, x86: Export addresses of PTI entry trampolines
2018-08-14 19:12:29 -03:00
kconfig: include kernel/Kconfig.preempt from init/Kconfig
2018-08-02 08:06:54 +09:00
kernel/kcov.c: mark write_comp_data() as notrace
2019-02-12 19:47:20 +01:00
kexec: add call to LSM hook in original kexec_load syscall
2018-07-16 12:31:57 -07:00
kexec: yield to scheduler when loading kimage segments
2018-06-15 07:55:24 +09:00
treewide: Use array_size() in vzalloc()
2018-06-12 16:19:22 -07:00
kprobes: Return error if we fail to reuse kprobe instead of BUG_ON()
2018-11-13 11:08:28 -08:00
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-08-13 11:25:07 -07:00
kbuild: move bin2c back to scripts/ from scripts/basic/
2018-07-18 01:18:05 +09:00
mm, devm_memremap_pages: add MEMORY_DEVICE_PRIVATE support
2019-01-13 09:51:04 +01:00
modsign: log module name in the event of an error
2018-07-02 11:36:17 +02:00
kobject: return error code if writing /sys/.../uevent fails
2019-02-12 19:47:06 +01:00
modsign: log module name in the event of an error
2018-07-02 11:36:17 +02:00
panic: avoid deadlocks in re-entrant console drivers
2018-12-29 13:37:57 +01:00
kernel/params.c: downgrade warning for unsafe parameters
2018-04-11 10:28:37 -07:00
Fix failure path in alloc_pid()
2019-01-13 09:51:06 +01:00
Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2018-04-03 19:15:32 -07:00
ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS
2018-12-05 19:32:03 +01:00
PM / reboot: Eliminate race between reboot and suspend
2018-08-06 12:35:20 +02:00
relay: check return of create_buf_file() properly
2019-03-13 14:02:35 -07:00
libnvdimm for 4.18
2018-06-08 17:21:52 -07:00
rseq: uapi: Declare rseq_cs field as union, update includes
2018-07-10 22:18:52 +02:00
audit/stable-4.18 PR 20180605
2018-06-06 16:34:00 -07:00
signal: Restore the stop PTRACE_EVENT_EXIT
2019-02-20 10:25:48 +01:00
cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM
2019-02-12 19:47:25 +01:00
smpboot: Remove cpumask from the API
2018-07-03 09:20:44 +02:00
nohz: Fix missing tick reprogram when interrupting an inline softirq
2018-08-03 15:52:10 +02:00
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-08-13 11:25:07 -07:00
ANDROID: mm: add a field to store names for private anonymous memory
2018-12-05 09:48:11 -08:00
Merge branch 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-06-10 10:17:09 -07:00
This is the 4.19.21 stable release
2019-02-12 20:37:21 +01:00
staging: irda: remove remaining remants of irda code removal
2018-04-16 11:26:49 +02:00
pids: introduce find_get_task_by_vpid() helper
2018-02-06 18:32:46 -08:00
kprobes: Remove jprobe API implementation
2018-06-21 12:33:05 +02:00
torture: Keep old-school dmesg format
2018-06-25 11:30:10 -07:00
tracepoint: Fix tracepoint array element size mismatch
2018-10-17 15:35:29 -04:00
headers: untangle kmemleak.h from mm.h
2018-04-05 21:36:27 -07:00
fs: add do_fchownat(), ksys_fchown() helpers and ksys_{,l}chown() wrappers
2018-04-02 20:15:59 +02:00
kernel: provide ksys_*() wrappers for syscalls called by kernel/uid16.c
2018-04-02 20:15:30 +02:00
umh: fix race condition
2018-06-07 16:56:28 -04:00
ANDROID: proc: Add /proc/uid directory
2019-03-06 15:59:21 +00:00
userns: also map extents in the reverse map to kernel IDs
2018-11-13 11:09:00 -08:00
uts: create "struct uts_namespace" from kmem_cache
2018-04-11 10:28:35 -07:00
sys: don't hold uts_sem while accessing userspace memory
2018-08-11 02:05:53 -05:00
watchdog: Mark watchdog touch functions as notrace
2018-08-30 12:56:40 +02:00
watchdog: Mark watchdog touch functions as notrace
2018-08-30 12:56:40 +02:00
watchdog: Mark watchdog touch functions as notrace
2018-08-30 12:56:40 +02:00
workqueue: Set worker->desc to workqueue name by default
2018-05-18 08:47:13 -07:00
3bbcbc8039