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Sergey Senozhatsky b047350555 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>
Git-commit: 1120ed5483941d9cd2cf52cb9644a4311dbd1011
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: Ib3cf57a59c3c3ec469f43f594a1b20514ea8e452
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
2017-02-21 12:39:12 +05:30
..
kasan UBSAN: run-time undefined behavior sanity checker 2016-03-22 11:09:57 -07:00
backing-dev.c block: fix bdi vs gendisk lifetime mismatch 2016-08-20 18:09:24 +02:00
balloon_compaction.c mm: balloon: use general non-lru movable page feature 2017-02-21 12:38:41 +05:30
bootmem.c mm: Remove __init annotations from free_bootmem_late 2016-03-22 11:03:23 -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: check the max limit for cma allocation 2016-11-16 05:53:10 -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: balloon: use general non-lru movable page feature 2017-02-21 12:38:41 +05:30
debug-pagealloc.c debug-pagealloc: Panic on pagealloc corruption 2016-10-28 10:55:48 +05:30
debug.c mm: add WasActive page flag 2016-05-31 15:27:11 -07:00
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: vmstat: add pageoutclean 2016-03-25 16:03:59 -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: remove gup_flags FOLL_WRITE games from __get_user_pages() 2016-12-09 17:43:44 -08:00
highmem.c mm/highmem: make kmap cache coloring aware 2014-08-06 18:01:22 -07:00
huge_memory.c Revert "Merge remote-tracking branch 'msm-4.4/tmp-510d0a3f' into msm-4.4" 2016-08-26 14:34:05 -07:00
hugetlb.c hugetlb: fix nr_pmds accounting with shared page tables 2016-09-07 08:32:35 +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
internal.h mm, kswapd: replace kswapd compaction with waking up kcompactd 2017-02-21 12:37:21 +05:30
interval_tree.c mm: replace vma->sharead.linear with vma->shared 2015-02-10 14:30:31 -08:00
Kconfig mm: Support address range reclaim 2016-06-22 14:44:20 -07:00
Kconfig.debug mm/debug_pagealloc: ask users for default setting of debug_pagealloc 2016-04-29 14:40:10 -07:00
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 kmemleak : Make kmemleak_stack_scan optional using config 2016-03-22 11:03:47 -07:00
ksm.c mm: migrate: support non-lru movable page migration 2017-02-21 12:38:28 +05:30
list_lru.c memcg: simplify and inline __mem_cgroup_from_kmem 2015-11-05 19:34:48 -08:00
maccess.c x86: remove more uaccess_32.h complexity 2016-08-27 11:23:38 +08:00
madvise.c mm: add a field to store names for private anonymous memory 2016-02-16 13:54:13 -08:00
Makefile Merge branch 'v4.4-16.09-android-tmp' into lsk-v4.4-16.09-android 2016-12-16 13:52:17 -08:00
memblock.c mm/memblock: disable local irqs while late memblock changes 2016-05-31 15:26:50 -07:00
memcontrol.c Merge "Merge branch 'v4.4-16.09-android-tmp' into lsk-v4.4-16.09-android" 2016-12-19 17:04:51 -08:00
memory-failure.c mm: Enhance per process reclaim to consider shared pages 2016-06-22 14:43:57 -07:00
memory.c Merge remote-tracking branch 'msm-4.4/tmp-510d0a3f' into msm-4.4 2016-10-21 18:00:55 -07:00
memory_hotplug.c mm, memory hotplug: small cleanup in online_pages() 2017-02-21 12:37:10 +05:30
mempolicy.c mm: add a field to store names for private anonymous memory 2016-02-16 13:54:13 -08:00
mempool.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
memtest.c lib: memtest: Add MEMTEST_ENABLE_DEFAULT option 2016-05-05 15:05:52 -07:00
migrate.c mm: balloon: use general non-lru movable page feature 2017-02-21 12:38:41 +05:30
mincore.c mm/mincore: use offset_in_page macro 2015-11-05 19:34:48 -08:00
mlock.c Merge remote-tracking branch 'lsk-44/linux-linaro-lsk-v4.4' into 44rc2 2016-03-23 20:51:00 -07:00
mm_init.c mm: meminit: remove mminit_verify_page_links 2015-06-30 19:44:56 -07:00
mmap.c Revert "arm64: Add support for app specific settings" 2016-08-15 15:08:53 -07:00
mmu_context.c
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: add a field to store names for private anonymous memory 2016-02-16 13:54:13 -08:00
mremap.c mm/mremap: use offset_in_page macro 2015-11-05 19:34:48 -08:00
msync.c mm/msync: use offset_in_page macro 2015-11-05 19:34:48 -08:00
nobootmem.c mm: Remove __init annotations from free_bootmem_late 2016-03-22 11:03:23 -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: make dump_tasks public 2016-03-22 11:03:30 -07:00
page-writeback.c Merge remote-tracking branch 'msm4.4/tmp-da9a92f' into msm-4.4 2016-10-28 10:48:35 -07:00
page_alloc.c mm: migrate: support non-lru movable page migration 2017-02-21 12:38:28 +05:30
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: introduce idle page tracking 2015-09-10 13:29:01 -07:00
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: Inform KASAN when allocating pages during isolation 2016-11-23 17:18:03 -08:00
page_owner.c mm/page_owner: ask users about default setting of PAGE_OWNER 2016-05-03 15:53:55 -07:00
pagewalk.c mm/pagewalk.c: prevent positive return value of walk_page_test() from being passed to callers 2015-03-25 16:20:30 -07:00
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: fix synchronization between synchronous map extension and chunk destruction 2016-07-27 09:47:33 -07:00
pgtable-generic.c mm,thp: khugepaged: call pte flush at the time of collapse 2016-02-25 12:01:23 -08:00
process_reclaim.c lowmemorykiller: Introduce sysfs node for ALMK and PPR adj threshold 2016-12-17 16:16:17 +05:30
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: change initial readahead window size calculation 2016-03-22 11:03:39 -07:00
rmap.c mm: Enhance per process reclaim to consider shared pages 2016-06-22 14:43:57 -07:00
shmem.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2016-07-29 21:38:37 +01:00
showmem.c mm: showmem: make the notifiers atomic 2016-03-22 11:03:55 -07:00
slab.c mm: SLAB hardened usercopy support 2016-08-27 11:23:38 +08:00
slab.h slab/slub: adjust kmem_cache_alloc_bulk API 2015-11-22 11:58:44 -08:00
slab_common.c mm: memcontrol: fix cgroup creation failure after many small jobs 2016-08-16 09:30:51 +02:00
slob.c slab/slub: adjust kmem_cache_alloc_bulk API 2015-11-22 11:58:44 -08:00
slub.c Merge branch 'v4.4-16.09-android-tmp' into lsk-v4.4-16.09-android 2016-12-16 13:52:17 -08:00
sparse-vmemmap.c
sparse.c
swap.c mm: make compound_head() robust 2015-11-06 17:50:42 -08:00
swap_cgroup.c mm: page_cgroup: rename file to mm/swap_cgroup.c 2014-12-10 17:41:09 -08:00
swap_ratio.c mm: swap_ratio: bail out if there aren't any other swap device 2016-05-31 15:23:38 -07:00
swap_state.c lowmemorykiller: Don't count swap cache pages twice 2016-04-13 11:11:01 -07:00
swapfile.c mm: swap: swap ratio support 2016-03-23 21:19:04 -07:00
truncate.c mm + fs: extends support for cache dropping 2016-03-23 21:24:12 -07:00
usercopy.c UPSTREAM: usercopy: remove page-spanning test for now 2016-09-14 14:44:29 +05:30
userfaultfd.c userfaultfd: avoid mmap_sem read recursion in mcopy_atomic 2015-09-04 16:54:41 -07:00
util.c mm: migrate: support non-lru movable page migration 2017-02-21 12:38:28 +05:30
vmacache.c mm/vmacache: inline vmacache_valid_mm() 2015-11-05 19:34:48 -08:00
vmalloc.c mm: Update is_vmalloc_addr to account for vmalloc savings 2016-03-22 11:03:59 -07:00
vmpressure.c mm: vmpressure: make vmpressure window variable 2016-12-16 20:25:45 +05:30
vmscan.c mm: balloon: use general non-lru movable page feature 2017-02-21 12:38:41 +05:30
vmstat.c mm, compaction: introduce kcompactd 2017-02-21 12:36:57 +05:30
workingset.c list_lru: add helpers to isolate items 2015-02-12 18:54:10 -08:00
zbud.c mm: zbud: fix the locking scenarios with zcache 2016-08-25 11:49:45 +05:30
zcache.c mm: zcache: fix merge issues 2016-06-07 11:57:44 -07:00
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 2017-02-21 12:39:12 +05:30
zswap.c Revert "Merge remote-tracking branch 'msm-4.4/tmp-510d0a3f' into msm-4.4" 2016-08-26 14:34:05 -07:00