Igor Redko 8e03351be7 mm/page_alloc.c: calculate 'available' memory in a separate function ...

commit d02bd27bd3 upstream.

Add a new field, VIRTIO_BALLOON_S_AVAIL, to virtio_balloon memory
statistics protocol, corresponding to 'Available' in /proc/meminfo.

It indicates to the hypervisor how big the balloon can be inflated
without pushing the guest system to swap.  This metric would be very
useful in VM orchestration software to improve memory management of
different VMs under overcommit.

This patch (of 2):

Factor out calculation of the available memory counter into a separate
exportable function, in order to be able to use it in other parts of the
kernel.

In particular, it appears a relevant metric to report to the hypervisor
via virtio-balloon statistics interface (in a followup patch).

Signed-off-by: Igor Redko <redkoi@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 4.4 as dependency of commit a1078e821b
 "xen: let alloc_xenballooned_pages() fail if not enough memory free"]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2020-01-23 08:18:35 +01:00

..

array.c

fs/proc/array.c: allow reporting eip/esp for all coredumping threads

2019-12-21 10:35:07 +01:00

base.c

proc: do not access cmdline nor environ from file-backed areas

2018-12-17 21:55:17 +01:00

cmdline.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

consoles.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

cpuinfo.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

devices.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

fd.c

proc: actually make proc_fd_permission() thread-friendly

2015-11-06 17:50:42 -08:00

fd.h

…

generic.c

proc: Fix unbalanced hard link numbers

2017-05-25 14:30:10 +02:00

inode.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2015-07-03 15:20:57 -07:00

internal.h

proc: Allow creating permanently empty directories that serve as mount points

2015-07-01 10:36:41 -05:00

interrupts.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

Kconfig

fs, proc: add help for CONFIG_PROC_CHILDREN

2015-07-17 16:39:52 -07:00

kcore.c

x86/fpu, sched: Introduce CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and use it on x86

2015-07-18 03:42:51 +02:00

kmsg.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

loadavg.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

Makefile

proc: Implement /proc/thread-self to point at the directory of the current thread

2014-08-04 10:07:11 -07:00

meminfo.c

mm/page_alloc.c: calculate 'available' memory in a separate function

2020-01-23 08:18:35 +01:00

namespaces.c

ptrace: use fsuid, fsgid, effective creds for fs access checks

2016-02-25 12:01:16 -08:00

nommu.c

vfs: add seq_file_path() helper

2015-06-23 18:01:07 -04:00

page.c

proc: add cond_resched to /proc/kpage* read/write loop

2015-09-10 13:29:01 -07:00

proc_net.c

VFS: normal filesystems (and lustre): d_inode() annotations

2015-04-15 15:06:57 -04:00

proc_sysctl.c

fs/proc/proc_sysctl.c: Fix a NULL pointer dereference

2019-05-16 19:44:51 +02:00

proc_tty.c

tty fix oops when rmmod 8250

2017-12-20 10:05:00 +01:00

root.c

proc: prevent stacking filesystems on top

2016-06-24 10:18:20 -07:00

self.c

don't pass nameidata to ->follow_link()

2015-05-10 22:20:15 -04:00

softirqs.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

stat.c

genirq: Prevent proc race against freeing of irq descriptors

2014-12-13 13:33:07 +01:00

task_mmu.c

coredump: fix race condition between mmget_not_zero()/get_task_mm() and core dumping

2019-06-22 08:18:27 +02:00

task_nommu.c

fs/proc: Stop trying to report thread stacks

2018-04-08 11:52:00 +02:00

thread_self.c

don't pass nameidata to ->follow_link()

2015-05-10 22:20:15 -04:00

uptime.c

cputime: Default implementation of nsecs -> cputime conversion

2014-03-13 15:56:43 +01:00

version.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

vmcore.c

proc/vmcore: Fix i386 build error of missing copy_oldmem_page_encrypted()

2019-11-25 15:54:47 +01:00