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Sergey Senozhatsky 1120ed5483 mm/zsmalloc: add `freeable' column to pool stat 
Add a new column to pool stats, which will tell how many pages ideally
can be freed by class compaction, so it will be easier to analyze
zsmalloc fragmentation.

At the moment, we have only numbers of FULL and ALMOST_EMPTY classes,
but they don't tell us how badly the class is fragmented internally.

The new /sys/kernel/debug/zsmalloc/zramX/classes output look as follows:

 class  size almost_full almost_empty obj_allocated   obj_used pages_used pages_per_zspage freeable
[..]
    12   224           0            2           146          5          8                4        4
    13   240           0            0             0          0          0                1        0
    14   256           1           13          1840       1672        115                1       10
    15   272           0            0             0          0          0                1        0
[..]
    49   816           0            3           745        735        149                1        2
    51   848           3            4           361        306         76                4        8
    52   864          12           14           378        268         81                3       21
    54   896           1           12           117         57         26                2       12
    57   944           0            0             0          0          0                3        0
[..]
 Total                26          131         12709      10994       1071                       134

For example, from this particular output we can easily conclude that
class-896 is heavily fragmented -- it occupies 26 pages, 12 can be freed
by compaction.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2016-03-17 15:09:34 -07:00
..
kasan mm: coalesce split strings 2016-03-17 15:09:34 -07:00
Kconfig mm: ZONE_DEVICE depends on SPARSEMEM_VMEMMAP 2016-03-17 15:09:34 -07:00
Kconfig.debug mm/page_ref: add tracepoint to track down page reference manipulation 2016-03-17 15:09:34 -07:00
Makefile mm/page_ref: add tracepoint to track down page reference manipulation 2016-03-17 15:09:34 -07:00
backing-dev.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
balloon_compaction.c virtio_balloon: fix race between migration and ballooning 2016-01-12 20:47:06 +02:00
bootmem.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
cleancache.c cleancache: constify cleancache_ops structure 2016-01-27 09:09:57 -05:00
cma.c mm/cma.c: suppress warning 2015-11-05 19:34:48 -08:00
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, kswapd: replace kswapd compaction with waking up kcompactd 2016-03-17 15:09:34 -07:00
debug.c mm: introduce page reference manipulation functions 2016-03-17 15:09:34 -07:00
debug_page_ref.c mm/page_ref: add tracepoint to track down page reference manipulation 2016-03-17 15:09:34 -07:00
dmapool.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
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: fault-inject take over bootstrap kmem_cache check 2016-03-15 16:55:16 -07:00
filemap.c mm: remove unnecessary uses of lock_page_memcg() 2016-03-15 16:55:16 -07:00
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: retire GUP WARN_ON_ONCE that outlived its usefulness 2016-02-03 08:57:14 -08:00
highmem.c mm/highmem: make kmap cache coloring aware 2014-08-06 18:01:22 -07:00
huge_memory.c thp: fix deadlock in split_huge_pmd() 2016-03-17 15:09:34 -07:00
hugetlb.c mm: convert pr_warning to pr_warn 2016-03-17 15:09:34 -07:00
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
…
internal.h mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
interval_tree.c mm: replace vma->sharead.linear with vma->shared 2015-02-10 14:30:31 -08:00
kmemcheck.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
kmemleak-test.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
kmemleak.c mm: coalesce split strings 2016-03-17 15:09:34 -07:00
ksm.c mm/ksm.c: mark stable page dirty 2016-01-15 17:56:32 -08:00
list_lru.c mm: memcontrol: move kmem accounting code to CONFIG_MEMCG 2016-01-20 17:09:18 -08:00
maccess.c mm/maccess.c: actually return -EFAULT from strncpy_from_unsafe 2015-11-05 19:34:48 -08:00
madvise.c mm/madvise: update comment on sys_madvise() 2016-03-15 16:55:16 -07:00
memblock.c mm: coalesce split strings 2016-03-17 15:09:34 -07:00
memcontrol.c mm: memcontrol: zap oom_info_lock 2016-03-17 15:09:34 -07:00
memory-failure.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
memory.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
memory_hotplug.c mm: coalesce split strings 2016-03-17 15:09:34 -07:00
mempolicy.c mm: coalesce split strings 2016-03-17 15:09:34 -07:00
mempool.c mm, mempool: only set __GFP_NOMEMALLOC if there are free elements 2016-03-17 15:09:34 -07:00
memtest.c memtest: remove unused header files 2015-09-08 15:35:28 -07:00
migrate.c mm: make remove_migration_ptes() beyond mm/migration.c 2016-03-17 15:09:34 -07:00
mincore.c thp: change pmd_trans_huge_lock() interface to return ptl 2016-01-21 17:20:51 -08:00
mlock.c mm: fix mlock accouting 2016-01-21 17:20:51 -08:00
mm_init.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
mmap.c mm: coalesce split strings 2016-03-17 15:09:34 -07:00
mmu_context.c sched/mm: call finish_arch_post_lock_switch in idle_task_exit and use_mm 2014-02-21 08:50:17 +01:00
mmu_notifier.c mmu-notifier: add clear_young callback 2015-09-10 13:29:01 -07:00
mmzone.c mm/mmzone.c: memmap_valid_within() can be boolean 2016-01-14 16:00:49 -08:00
mprotect.c mm, dax: check for pmd_none() after split_huge_pmd() 2016-02-11 18:35:48 -08:00
mremap.c mm: cleanup *pte_alloc* interfaces 2016-03-17 15:09:34 -07:00
msync.c mm/msync: use offset_in_page macro 2015-11-05 19:34:48 -08:00
nobootmem.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
nommu.c mm: deduplicate memory overcommitment code 2016-03-17 15:09:34 -07:00
oom_kill.c mm: coalesce split strings 2016-03-17 15:09:34 -07:00
page-writeback.c mm: remove unnecessary uses of lock_page_memcg() 2016-03-15 16:55:16 -07:00
page_alloc.c mm: meminit: initialise more memory for inode/dentry hash tables in early boot 2016-03-17 15:09:34 -07:00
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_poisoning.c: allow for zero poisoning 2016-03-15 16:55:16 -07:00
page_idle.c mm: add page_check_address_transhuge() helper 2016-01-15 17:56:32 -08:00
page_io.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
page_isolation.c mm/page_isolation: do some cleanup in "undo_isolate_page_range" 2016-01-15 17:56:32 -08:00
page_owner.c mm: coalesce split strings 2016-03-17 15:09:34 -07:00
page_poison.c mm/page_poisoning.c: allow for zero poisoning 2016-03-15 16:55:16 -07:00
pagewalk.c thp: rename split_huge_page_pmd() to split_huge_pmd() 2016-01-15 17:56:32 -08:00
percpu-km.c mm: percpu: use pr_fmt to prefix output 2016-03-17 15:09:34 -07:00
percpu-vm.c percpu: move region iterations out of pcpu_[de]populate_chunk() 2014-09-02 14:46:02 -04:00
percpu.c mm: percpu: use pr_fmt to prefix output 2016-03-17 15:09:34 -07:00
pgtable-generic.c mm/thp/migration: switch from flush_tlb_range to flush_pmd_tlb_range 2016-03-17 15:09:34 -07:00
process_vm_access.c ptrace: use fsuid, fsgid, effective creds for fs access checks 2016-01-20 17:09:18 -08:00
quicklist.c
…
readahead.c mm: move lru_to_page to mm_inline.h 2016-01-14 16:00:49 -08:00
rmap.c thp: rewrite freeze_page()/unfreeze_page() with generic rmap walkers 2016-03-17 15:09:34 -07:00
shmem.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
slab.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
slab.h mm: memcontrol: report slab usage in cgroup2 memory.stat 2016-03-17 15:09:34 -07:00
slab_common.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
slob.c mm: slab: free kmem_cache_node after destroy sysfs file 2016-02-18 16:23:24 -08:00
slub.c mm: coalesce split strings 2016-03-17 15:09:34 -07:00
sparse-vmemmap.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
sparse.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
swap.c mm, x86: get_user_pages() for dax mappings 2016-01-15 17:56:32 -08:00
swap_cgroup.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
swap_state.c mm: memcontrol: charge swap to cgroup2 2016-01-20 17:09:18 -08:00
swapfile.c mm: coalesce split strings 2016-03-17 15:09:34 -07:00
truncate.c mm: remove unnecessary uses of lock_page_memcg() 2016-03-15 16:55:16 -07:00
userfaultfd.c mm: cleanup *pte_alloc* interfaces 2016-03-17 15:09:34 -07:00
util.c mm: deduplicate memory overcommitment code 2016-03-17 15:09:34 -07:00
vmacache.c mm/vmacache: inline vmacache_valid_mm() 2015-11-05 19:34:48 -08:00
vmalloc.c mm/vmalloc: use PAGE_ALIGNED() to check PAGE_SIZE alignment 2016-03-17 15:09:34 -07:00
vmpressure.c mm/vmpressure.c: fix subtree pressure detection 2016-02-03 08:28:43 -08:00
vmscan.c mm: introduce page reference manipulation functions 2016-03-17 15:09:34 -07:00
vmstat.c thp, vmstats: count deferred split events 2016-03-17 15:09:34 -07:00
workingset.c mm: workingset: make shadow node shrinker memcg aware 2016-03-17 15:09:34 -07:00
zbud.c mm/zbud.c: use list_last_entry() instead of list_tail_entry() 2016-01-15 11:40:52 -08:00
zpool.c mm: zsmalloc: constify struct zs_pool name 2015-11-06 17:50:42 -08:00
zsmalloc.c mm/zsmalloc: add `freeable' column to pool stat 2016-03-17 15:09:34 -07:00
zswap.c mm/zswap: change incorrect strncmp use to strcmp 2015-12-18 14:25:40 -08:00