Hugh Dickins 3e3d38fd98 kaiser: vmstat show NR_KAISERTABLE as nr_overhead ... The kaiser update made an interesting choice, never to free any shadow page tables. Contention on global spinlock was worrying, particularly with it held across page table scans when freeing. Something had to be done: I was going to add refcounting; but simply never to free them is an appealing choice, minimizing contention without complicating the code (the more a page table is found already, the less the spinlock is used). But leaking pages in this way is also a worry: can we get away with it? At the very least, we need a count to show how bad it actually gets: in principle, one might end up wasting about 1/256 of memory that way (1/512 for when direct-mapped pages have to be user-mapped, plus 1/512 for when they are user-mapped from the vmalloc area on another occasion (but we don't have vmalloc'ed stacks, so only large ldts are vmalloc'ed). Add per-cpu stat NR_KAISERTABLE: including 256 at startup for the shared pgd entries, and 1 for each intermediate page table added thereafter for user-mapping - but leave out the 1 per mm, for its shadow pgd, because that distracts from the monotonic increase. Shown in /proc/vmstat as nr_overhead (0 if kaiser not enabled). In practice, it doesn't look so bad so far: more like 1/12000 after nine hours of gtests below; and movable pageblock segregation should tend to cluster the kaiser tables into a subset of the address space (if not, they will be bad for compaction too). But production may tell a different story: keep an eye on this number, and bring back lighter freeing if it gets out of control (maybe a shrinker). Signed-off-by: Hugh Dickins <hughd@google.com> Acked-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-01-05 15:44:24 +01:00
..
kasan	kasan: respect /proc/sys/kernel/traceoff_on_warning	2017-06-17 06:39:36 +02:00
backing-dev.c	block: fix double-free in the failure path of cgwb_bdi_init()	2017-02-26 11:07:51 +01:00
balloon_compaction.c	virtio_balloon: fix race between migration and ballooning	2016-03-03 15:07:18 -08:00
bootmem.c	bootmem: avoid freeing to bootmem after bootmem is done	2015-09-08 15:35:28 -07:00
cleancache.c	cleancache: remove limit on the number of cleancache enabled filesystems	2015-04-14 16:49:03 -07:00
cma.c	mm/cma: silence warnings due to max() usage	2016-11-10 16:36:36 +01:00
cma.h	mm: cma: mark cma_bitmap_maxno() inline in header	2015-08-14 15:56:32 -07:00
cma_debug.c	mm/cma_debug: correct size input to bitmap function	2015-07-17 16:39:54 -07:00
compaction.c	mm, compaction: prevent VM_BUG_ON when terminating freeing scanner	2016-08-10 11:49:25 +02:00
debug-pagealloc.c	mm, hwpoison: fixup "mm: check the return value of lookup_page_ext for all call sites"	2017-11-24 11:26:29 +01:00
debug.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
dmapool.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
early_ioremap.c	mm/early_ioremap: use offset_in_page macro	2015-11-05 19:34:48 -08:00
fadvise.c	writeback: implement and use inode_congested()	2015-06-02 08:33:35 -06:00
failslab.c	mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM	2015-11-06 17:50:42 -08:00
filemap.c	mm: do not access page->mapping directly on page_endio	2017-03-12 06:37:25 +01:00
frame_vector.c	mm: fix docbook comment for get_vaddr_frames()	2015-11-05 19:34:48 -08:00
frontswap.c	frontswap: allow multiple backends	2015-06-24 17:49:45 -07:00
gup.c	mm: larger stack guard gap, between vmas	2017-06-26 07:13:11 +02:00
highmem.c	mm/highmem: make kmap cache coloring aware	2014-08-06 18:01:22 -07:00
huge_memory.c	thp: fix MADV_DONTNEED vs. numa balancing race	2017-12-16 10:33:50 +01:00
hugetlb.c	mm, hugetlb: use pte_present() instead of pmd_present() in follow_huge_pmd()	2017-04-08 09:53:32 +02:00
hugetlb_cgroup.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
hwpoison-inject.c	hwpoison: use page_cgroup_ino for filtering by memcg	2015-09-10 13:29:01 -07:00
init-mm.c	mm: Add a user_ns owner to mm_struct and fix ptrace permission checks	2017-01-06 11:16:11 +01:00
internal.h	mm, mprotect: flush TLB if potentially racing with a parallel reclaim leaving stale TLB entries	2017-08-11 09:08:50 -07:00
interval_tree.c	mm: replace vma->sharead.linear with vma->shared	2015-02-10 14:30:31 -08:00
Kconfig	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
Kconfig.debug	mm/debug_pagealloc: remove obsolete Kconfig options	2015-01-08 15:10:52 -08:00
kmemcheck.c	mm/slab_common: move kmem_cache definition to internal header	2014-10-09 22:25:50 -04:00
kmemleak-test.c	mm/kmemleak-test.c: use pr_fmt for logging	2014-06-06 16:08:18 -07:00
kmemleak.c	mm/kmemleak.c: remove unneeded initialization of object to NULL	2015-11-05 19:34:48 -08:00
ksm.c	mm,ksm: fix endless looping in allocating memory when ksm enable	2016-10-07 15:23:40 +02:00
list_lru.c	mm/list_lru.c: fix list_lru_count_node() to be race free	2017-07-21 07:44:56 +02:00
maccess.c	mm/maccess.c: actually return -EFAULT from strncpy_from_unsafe	2015-11-05 19:34:48 -08:00
madvise.c	mm/madvise.c: fix madvise() infinite loop under special circumstances	2017-12-05 11:22:50 +01:00
Makefile	media updates for v4.3-rc1	2015-09-11 16:42:39 -07:00
memblock.c	mm: consider memblock reservations for deferred memory initialization sizing	2017-06-14 13:16:26 +02:00
memcontrol.c	mm: memcontrol: avoid unused function warning	2017-03-18 19:09:57 +08:00
memory-failure.c	mm/memory-failure.c: use compound_head() flags for huge pages	2017-06-26 07:13:10 +02:00
memory.c	mm, mprotect: flush TLB if potentially racing with a parallel reclaim leaving stale TLB entries	2017-08-11 09:08:50 -07:00
memory_hotplug.c	base/memory, hotplug: fix a kernel oops in show_valid_zones()	2017-02-09 08:02:47 +01:00
mempolicy.c	mm/mempolicy: fix use after free when calling get_mempolicy	2017-08-24 17:02:35 -07:00
mempool.c	mm/mempool: avoid KASAN marking mempool poison checks as use-after-free	2017-08-12 19:29:09 -07:00
memtest.c	memtest: remove unused header files	2015-09-08 15:35:28 -07:00
migrate.c	Sanitize 'move_pages()' permission checks	2017-08-24 17:02:36 -07:00
mincore.c	mm/mincore: use offset_in_page macro	2015-11-05 19:34:48 -08:00
mlock.c	mlock: fix mlock count can not decrease in race condition	2017-06-07 12:06:01 +02:00
mm_init.c	mm: meminit: remove mminit_verify_page_links	2015-06-30 19:44:56 -07:00
mmap.c	mm: fix overflow check in expand_upwards()	2017-07-21 07:44:58 +02:00
mmu_context.c	mm/mmu_context, sched/core: Fix mmu_context.h assumption	2017-12-25 14:22:09 +01:00
mmu_notifier.c	mmu-notifier: add clear_young callback	2015-09-10 13:29:01 -07:00
mmzone.c	mm: microoptimize zonelist operations	2015-02-11 17:06:02 -08:00
mprotect.c	mm, mprotect: flush TLB if potentially racing with a parallel reclaim leaving stale TLB entries	2017-08-11 09:08:50 -07:00
mremap.c	mm, mprotect: flush TLB if potentially racing with a parallel reclaim leaving stale TLB entries	2017-08-11 09:08:50 -07:00
msync.c	mm/msync: use offset_in_page macro	2015-11-05 19:34:48 -08:00
nobootmem.c	mm: page_alloc: pass PFN to __free_pages_bootmem	2015-06-30 19:44:55 -07:00
nommu.c	mm/nommu.c: drop unlikely inside BUG_ON()	2015-11-05 19:34:48 -08:00
oom_kill.c	mm/oom_kill.c: avoid attempting to kill init sharing same memory	2015-12-12 10:15:34 -08:00
page-writeback.c	writeback: use higher precision calculation in domain_dirty_limits()	2016-07-27 09:47:29 -07:00
page_alloc.c	mm: check the return value of lookup_page_ext for all call sites	2017-11-24 08:32:25 +01:00
page_counter.c	mm: page_counter: let page_counter_try_charge() return bool	2015-11-05 19:34:48 -08:00
page_ext.c	mm/page_ext.c: check if page_ext is not prepared	2017-11-24 08:32:25 +01:00
page_idle.c	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
page_io.c	fs: use helper bio_add_page() instead of open coding on bi_io_vec	2015-08-13 12:32:00 -06:00
page_isolation.c	mm: fix invalid node in alloc_migrate_target()	2016-04-20 15:41:53 +09:00
page_owner.c	mm: check the return value of lookup_page_ext for all call sites	2017-11-24 08:32:25 +01:00
pagewalk.c	mm/pagewalk.c: report holes in hugetlb ranges	2017-11-24 08:32:25 +01:00
percpu-km.c	percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated	2014-09-02 14:46:05 -04:00
percpu-vm.c	percpu: move region iterations out of pcpu_[de]populate_chunk()	2014-09-02 14:46:02 -04:00
percpu.c	percpu: acquire pcpu_lock when updating pcpu_nr_empty_pop_pages	2017-03-26 12:13:20 +02:00
pgtable-generic.c	mm,thp: khugepaged: call pte flush at the time of collapse	2016-02-25 12:01:23 -08:00
process_vm_access.c	ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-02-25 12:01:16 -08:00
quicklist.c
readahead.c	mm, fs: introduce mapping_gfp_constraint()	2015-11-06 17:50:42 -08:00
rmap.c	mm/rmap: batched invalidations should use existing api	2017-12-25 14:22:09 +01:00
shmem.c	tmpfs: fix regression hang in fallocate undo	2016-07-27 09:47:40 -07:00
slab.c	slab/slub: adjust kmem_cache_alloc_bulk API	2015-11-22 11:58:44 -08:00
slab.h	slab/slub: adjust kmem_cache_alloc_bulk API	2015-11-22 11:58:44 -08:00
slab_common.c	slub: do not merge cache if slub_debug contains a never-merge flag	2017-10-21 17:09:05 +02:00
slob.c	slab/slub: adjust kmem_cache_alloc_bulk API	2015-11-22 11:58:44 -08:00
slub.c	slub/memcg: cure the brainless abuse of sysfs attributes	2017-06-07 12:06:01 +02:00
sparse-vmemmap.c
sparse.c
swap.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
swap_cgroup.c	mm, swap_cgroup: reschedule when neeed in swap_cgroup_swapoff()	2017-07-05 14:37:15 +02:00
swap_state.c	mm: swap: zswap: maybe_preload & refactoring	2015-09-08 15:35:28 -07:00
swapfile.c	swapfile: fix memory corruption via malformed swapfile	2016-11-18 10:48:34 +01:00
truncate.c	fs: add i_blocksize()	2017-06-14 13:16:24 +02:00
userfaultfd.c	userfaultfd: avoid mmap_sem read recursion in mcopy_atomic	2015-09-04 16:54:41 -07:00
util.c	proc: revert /proc/<pid>/maps [stack:TID] annotation	2016-09-15 08:27:46 +02:00
vmacache.c	mm/vmacache: inline vmacache_valid_mm()	2015-11-05 19:34:48 -08:00
vmalloc.c	mm: vmalloc: don't remove inexistent guard hole in remove_vm_area()	2015-11-20 16:17:32 -08:00
vmpressure.c	mm: vmpressure: fix sending wrong events on underflow	2017-03-12 06:37:25 +01:00
vmscan.c	mm: fix classzone_idx underflow in shrink_zones()	2017-07-15 11:57:44 +02:00
vmstat.c	kaiser: vmstat show NR_KAISERTABLE as nr_overhead	2018-01-05 15:44:24 +01:00
workingset.c	mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page()	2016-10-28 03:01:34 -04:00
zbud.c	mm: zsmalloc: constify struct zs_pool name	2015-11-06 17:50:42 -08:00
zpool.c	mm: zsmalloc: constify struct zs_pool name	2015-11-06 17:50:42 -08:00
zsmalloc.c	zsmalloc: fix zs_can_compact() integer overflow	2016-05-18 17:06:44 -07:00
zswap.c	zswap: disable changing params if init fails	2017-02-09 08:02:45 +01:00