linux_dsm_epyc7002/mm
Hugh Dickins 78ecba0812 mm: fix ever-decreasing swap priority
Vegard Nossum has noticed the ever-decreasing negative priority in a
swapon /swapoff loop, which eventually would misprioritize when int wraps
positive.  Not worth spending much code on, but probably better fixed.

It's easy to handle the swapping on and off of just one area, but there's
not much point if a pair or more still misbehave.  To handle the general
case, swapoff should compact negative priorities, keeping them always from
-1 to -MAX_SWAPFILES.  That's a change, but should cause no regression,
since these negative (unspecified) priorities are disjoint from the the
positive specified priorities 0 to 32767.

One small functional difference, which seems appropriate: when swapoff
fails to free all swap from a negative priority area, that area is now
reinserted at lowest priority, rather than at its original priority.

In moving down swapon's setting of priority, I notice that an area is
visible to /proc/swaps when it has swap_map set, yet that was being set
before all the visible fields were properly filled in: corrected.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reported-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-24 10:47:21 -07:00
..
allocpercpu.c
backing-dev.c
bootmem.c bootmem: replace node_boot_start in struct bootmem_data 2008-07-24 10:47:20 -07:00
bounce.c
dmapool.c
fadvise.c
filemap_xip.c
filemap.c generic_file_aio_read() cleanups 2008-07-24 10:47:16 -07:00
fremap.c
highmem.c highmem: Export totalhigh_pages. 2008-07-19 22:39:46 -07:00
hugetlb.c hugetlb: quota is not freed for unused reserved private huge pages 2008-07-24 10:47:19 -07:00
internal.h mm: export prep_compound_page to mm 2008-07-24 10:47:17 -07:00
Kconfig mm: make CONFIG_MIGRATION available w/o CONFIG_NUMA 2008-07-24 10:47:21 -07:00
maccess.c
madvise.c
Makefile mm: remove mm_init compilation dependency on CONFIG_DEBUG_MEMORY_INIT 2008-07-24 10:47:17 -07:00
memcontrol.c
memory_hotplug.c memory-hotplug: add sysfs removable attribute for hotplug memory remove 2008-07-24 10:47:21 -07:00
memory.c hugetlb: introduce pud_huge 2008-07-24 10:47:18 -07:00
mempolicy.c hugetlb: modular state for hugetlb page size 2008-07-24 10:47:17 -07:00
mempool.c
migrate.c mm: make CONFIG_MIGRATION available w/o CONFIG_NUMA 2008-07-24 10:47:21 -07:00
mincore.c
mlock.c
mm_init.c mm: create /sys/kernel/mm 2008-07-24 10:47:17 -07:00
mmap.c hugetlb: modular state for hugetlb page size 2008-07-24 10:47:17 -07:00
mmzone.c
mprotect.c mm: record MAP_NORESERVE status on vmas and fix small page mprotect reservations 2008-07-24 10:47:16 -07:00
mremap.c
msync.c
nommu.c
oom_kill.c
page_alloc.c memory hotplug: small fixes to bootmem freeing for memory hotremove 2008-07-24 10:47:21 -07:00
page_io.c
page_isolation.c
page-writeback.c Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 2008-07-15 08:36:38 -07:00
pagewalk.c
pdflush.c
prio_tree.c
quicklist.c
readahead.c
rmap.c
shmem_acl.c
shmem.c tmpfs: support aio 2008-07-24 10:47:16 -07:00
slab.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
slob.c slob: record page flag overlays explicitly 2008-07-24 10:47:15 -07:00
slub.c slub: record page flag overlays explicitly 2008-07-24 10:47:15 -07:00
sparse-vmemmap.c
sparse.c memory hotplug: allocate usemap on the section with pgdat 2008-07-24 10:47:21 -07:00
swap_state.c
swap.c mm: remove initialization of static per-cpu variables 2008-07-24 10:47:21 -07:00
swapfile.c mm: fix ever-decreasing swap priority 2008-07-24 10:47:21 -07:00
thrash.c
tiny-shmem.c
truncate.c
util.c
vmalloc.c vmallocinfo: add NUMA information 2008-07-24 10:47:17 -07:00
vmscan.c
vmstat.c mm/vmstat.c: proper externs 2008-07-24 10:47:14 -07:00