Michal Hocko 047200481e BACKPORT: partial: mm, oom_reaper: do not mmput synchronously from the oom reaper context ... (cherry picked from commit ec8d7c14ea14922fe21945b458a75e39f11dd832) Tetsuo has properly noted that mmput slow path might get blocked waiting for another party (e.g. exit_aio waits for an IO). If that happens the oom_reaper would be put out of the way and will not be able to process next oom victim. We should strive for making this context as reliable and independent on other subsystems as much as possible. Introduce mmput_async which will perform the slow path from an async (WQ) context. This will delay the operation but that shouldn't be a problem because the oom_reaper has reclaimed the victim's address space for most cases as much as possible and the remaining context shouldn't bind too much memory anymore. The only exception is when mmap_sem trylock has failed which shouldn't happen too often. The issue is only theoretical but not impossible. Signed-off-by: Michal Hocko <mhocko@suse.com> Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Only backports mmput_async. Change-Id: I5fe54abcc629e7d9eab9fe03908903d1174177f1 Signed-off-by: Arve Hjønnevåg <arve@android.com>		2017-09-21 17:45:15 +00:00
..
bpf	This is the 4.4.78 stable release	2017-07-21 09:14:57 +02:00
configs	kconfig: tinyconfig: provide whole choice blocks to avoid warnings	2016-09-24 10:07:42 +02:00
debug	This is the 4.4.40 stable release	2017-01-09 10:12:25 -08:00
events	This is the 4.4.85 stable release	2017-08-30 14:35:43 +02:00
gcov	gcov: support GCC 7.1	2017-09-02 07:06:51 +02:00
irq	genirq: Release resources in __setup_irq() error path	2017-06-26 07:13:10 +02:00
livepatch	livepatch: x86: fix relocation computation with kASLR	2015-11-11 17:36:04 +01:00
locking	This is the 4.4.88 stable release	2017-09-14 09:48:29 -07:00
power	UPSTREAM: PM / sleep: make PM notifiers called symmetrically	2017-04-10 17:12:04 -07:00
printk	UPSTREAM: printk: when dumping regs, show the stack, not thread_info	2017-08-09 15:23:22 +01:00
rcu	This is the 4.4.37 stable release	2016-12-08 15:08:27 -08:00
sched	BACKPORT: cpufreq: schedutil: Use policy-dependent transition delays	2017-09-06 20:36:47 +00:00
time	This is the 4.4.79 stable release	2017-07-27 15:36:54 -07:00
trace	This is the 4.4.85 stable release	2017-08-30 14:35:43 +02:00
.gitignore	certs: add .gitignore to stop git nagging about x509_certificate_list	2015-10-21 15:18:35 +01:00
acct.c
async.c
audit.c	BACKPORT: audit: consistently record PIDs with task_tgid_nr()	2016-09-24 15:10:25 -07:00
audit.h	audit: audit_tree_match can be boolean	2015-11-04 08:23:51 -05:00
audit_fsnotify.c
audit_tree.c	audit: audit_tree_match can be boolean	2015-11-04 08:23:51 -05:00
audit_watch.c	audit: Fix use after free in audit_remove_watch_rule()	2017-08-24 17:02:35 -07:00
auditfilter.c	audit: fix comment block whitespace	2015-11-04 08:23:51 -05:00
auditsc.c	BACKPORT: audit: consistently record PIDs with task_tgid_nr()	2016-09-24 15:10:25 -07:00
backtracetest.c
bounds.c
capability.c	exec: Ensure mm->user_ns contains the execed files	2017-01-06 11:16:14 +01:00
cgroup.c	Revert "[RFC]cgroup: Change from CAP_SYS_NICE to CAP_SYS_RESOURCE for cgroup migration permissions"	2017-04-25 18:31:07 +00:00
cgroup_freezer.c	cgroup: fix handling of multi-destination migration from subtree_control enabling	2015-12-03 10:18:21 -05:00
cgroup_pids.c	cgroup_pids: don't account for the root cgroup	2015-12-03 10:18:21 -05:00
compat.c
configs.c
context_tracking.c	context_tracking: avoid irq_save/irq_restore on guest entry and exit	2015-11-10 12:06:23 +01:00
cpu.c	This is the 4.4.43 stable release	2017-01-17 12:44:14 -08:00
cpu_pm.c
cpuset.c	This is the 4.4.87 stable release	2017-09-07 10:17:02 +02:00
crash_dump.c
cred.c	cred: Reject inodes with invalid ids in set_create_file_as()	2016-09-15 08:27:49 +02:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	Merge remote-tracking branch 'common/android-4.4' into android-4.4.y	2016-09-13 14:47:50 -07:00
extable.c	kernel/extable.c: mark core_kernel_text notrace	2017-07-21 07:44:56 +02:00
fork.c	BACKPORT: partial: mm, oom_reaper: do not mmput synchronously from the oom reaper context	2017-09-21 17:45:15 +00:00
freezer.c
futex.c	futex: Add missing error handling to FUTEX_REQUEUE_PI	2017-03-22 12:04:19 +01:00
futex_compat.c	BACKPORT: ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-07-07 16:30:43 -07:00
groups.c
hung_task.c
irq_work.c	treewide: Remove old email address	2015-11-23 09:44:58 +01:00
jump_label.c	jump_labels: API for flushing deferred jump label updates	2017-01-19 20:17:19 +01:00
kallsyms.c
kcmp.c	BACKPORT: ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-07-07 16:30:43 -07:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kexec: use file name as the output message prefix	2015-11-06 17:50:42 -08:00
kexec_core.c	kexec: use file name as the output message prefix	2015-11-06 17:50:42 -08:00
kexec_file.c	kexec: fix double-free when failing to relocate the purgatory	2016-09-24 10:07:36 +02:00
kexec_internal.h
kmod.c	kmod: don't run async usermode helper as a child of kworker thread	2015-10-23 17:55:10 +09:00
kprobes.c	tracing/kprobes: Enforce kprobes teardown after testing	2017-05-25 14:30:17 +02:00
ksysfs.c
kthread.c	UPSTREAM: kthread: Pin the stack via try_get_task_stack()/put_task_stack() in to_live_kthread() function	2017-08-09 15:23:22 +01:00
latencytop.c
Makefile
membarrier.c	Fix: Disable sys_membarrier when nohz_full is enabled	2017-03-12 06:37:26 +01:00
memremap.c	mm: fix devm_memremap_pages crash, use mem_hotplug_{begin, done}	2017-01-19 20:17:18 +01:00
module-internal.h
module.c	module: Invalidate signatures on force-loaded modules	2016-08-20 18:09:27 +02:00
module_signing.c	KEYS: Merge the type-specific data with the payload data	2015-10-21 15:18:36 +01:00
notifier.c
nsproxy.c
padata.c	padata: free correct variable	2017-05-20 14:27:02 +02:00
panic.c	kernel/panic.c: add missing \n	2017-07-05 14:37:19 +02:00
params.c	Nothing exciting, minor tweaks and cleanups.	2015-11-09 15:53:39 -08:00
pid.c	pids: make task_tgid_nr_ns() safe	2017-08-24 17:02:36 -07:00
pid_namespace.c	pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes	2017-05-25 14:30:11 +02:00
profile.c
ptrace.c	ptrace: Properly initialize ptracer_cred on fork	2017-06-14 13:16:20 +02:00
range.c
reboot.c
relay.c
resource.c	/proc/iomem: only expose physical resource addresses to privileged users	2017-08-06 19:19:42 -07:00
seccomp.c	seccomp: always propagate NO_NEW_PRIVS on tsync	2016-03-03 15:07:25 -08:00
signal.c	signal: protect SIGNAL_UNKILLABLE from unintentional clearing.	2017-08-11 09:08:59 -07:00
smp.c	mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd	2015-11-06 17:50:42 -08:00
smpboot.c	stop_machine: Kill smp_hotplug_thread->pre_unpark, introduce stop_machine_unpark()	2015-10-20 10:23:55 +02:00
smpboot.h
softirq.c
stacktrace.c
stop_machine.c	kernel: remove stop_machine() Kconfig dependency	2015-12-12 10:15:34 -08:00
sys.c	This is the 4.4.16 stable release	2016-08-01 15:57:55 -07:00
sys_ni.c	mm: mlock: add new mlock system call	2015-11-05 19:34:48 -08:00
sysctl.c	This is the 4.4.77 stable release	2017-07-15 13:29:08 +02:00
sysctl_binary.c	fs/coredump: prevent fsuid=0 dumps into user-controlled directories	2016-04-12 09:08:58 -07:00
task_work.c
taskstats.c
test_kprobes.c
torture.c	torture: Consolidate cond_resched_rcu_qs() into stutter_wait()	2015-10-06 11:25:01 -07:00
tracepoint.c	tracepoint: Give priority to probes of tracepoints	2015-10-25 21:33:54 -04:00
tsacct.c
uid16.c
up.c
user-return-notifier.c
user.c
user_namespace.c
utsname.c
utsname_sysctl.c
watchdog.c	This is the 4.4.40 stable release	2017-01-09 10:12:25 -08:00
workqueue.c	workqueue: implicit ordered attribute should be overridable	2017-08-11 09:09:00 -07:00
workqueue_internal.h