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Commit bc49a783 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'akpm' (patches from Andrew) 

Merge updates from Andrew Morton:
 "142 patches:

   - DAX updates

   - various misc bits

   - OCFS2 updates

   - most of MM"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (142 commits)
  mm/z3fold.c: limit first_num to the actual range of possible buddy indexes
  mm: fix <linux/pagemap.h> stray kernel-doc notation
  zram: remove obsolete sysfs attrs
  mm/memblock.c: remove unnecessary log and clean up
  oom-reaper: use madvise_dontneed() logic to decide if unmap the VMA
  mm: drop unused argument of zap_page_range()
  mm: drop zap_details::check_swap_entries
  mm: drop zap_details::ignore_dirty
  mm, page_alloc: warn_alloc nodemask is NULL when cpusets are disabled
  mm: help __GFP_NOFAIL allocations which do not trigger OOM killer
  mm, oom: do not enforce OOM killer for __GFP_NOFAIL automatically
  mm: consolidate GFP_NOFAIL checks in the allocator slowpath
  lib/show_mem.c: teach show_mem to work with the given nodemask
  arch, mm: remove arch specific show_mem
  mm, page_alloc: warn_alloc print nodemask
  mm, page_alloc: do not report all nodes in show_mem
  Revert "mm: bail out in shrink_inactive_list()"
  mm, vmscan: consider eligible zones in get_scan_count
  mm, vmscan: cleanup lru size claculations
  mm, vmscan: do not count freed pages as PGDEACTIVATE
  ...
parents be5165a5 f201ebd8

Documentation/ABI/obsolete/sysfs-block-zram

deleted100644 → 0
+0 −119
Original line number Diff line number Diff line 
What:		/sys/block/zram<id>/num_reads

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The num_reads file is read-only and specifies the number of

		reads (failed or successful) done on this device.

		Now accessible via zram<id>/stat node.



What:		/sys/block/zram<id>/num_writes

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The num_writes file is read-only and specifies the number of

		writes (failed or successful) done on this device.

		Now accessible via zram<id>/stat node.



What:		/sys/block/zram<id>/invalid_io

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The invalid_io file is read-only and specifies the number of

		non-page-size-aligned I/O requests issued to this device.

		Now accessible via zram<id>/io_stat node.



What:		/sys/block/zram<id>/failed_reads

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The failed_reads file is read-only and specifies the number of

		failed reads happened on this device.

		Now accessible via zram<id>/io_stat node.



What:		/sys/block/zram<id>/failed_writes

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The failed_writes file is read-only and specifies the number of

		failed writes happened on this device.

		Now accessible via zram<id>/io_stat node.



What:		/sys/block/zram<id>/notify_free

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The notify_free file is read-only. Depending on device usage

		scenario it may account a) the number of pages freed because

		of swap slot free notifications or b) the number of pages freed

		because of REQ_DISCARD requests sent by bio. The former ones

		are sent to a swap block device when a swap slot is freed, which

		implies that this disk is being used as a swap disk. The latter

		ones are sent by filesystem mounted with discard option,

		whenever some data blocks are getting discarded.

		Now accessible via zram<id>/io_stat node.



What:		/sys/block/zram<id>/zero_pages

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The zero_pages file is read-only and specifies number of zero

		filled pages written to this disk. No memory is allocated for

		such pages.

		Now accessible via zram<id>/mm_stat node.



What:		/sys/block/zram<id>/orig_data_size

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The orig_data_size file is read-only and specifies uncompressed

		size of data stored in this disk. This excludes zero-filled

		pages (zero_pages) since no memory is allocated for them.

		Unit: bytes

		Now accessible via zram<id>/mm_stat node.



What:		/sys/block/zram<id>/compr_data_size

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The compr_data_size file is read-only and specifies compressed

		size of data stored in this disk. So, compression ratio can be

		calculated using orig_data_size and this statistic.

		Unit: bytes

		Now accessible via zram<id>/mm_stat node.



What:		/sys/block/zram<id>/mem_used_total

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The mem_used_total file is read-only and specifies the amount

		of memory, including allocator fragmentation and metadata

		overhead, allocated for this disk. So, allocator space

		efficiency can be calculated using compr_data_size and this

		statistic.

		Unit: bytes

		Now accessible via zram<id>/mm_stat node.



What:		/sys/block/zram<id>/mem_used_max

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The mem_used_max file is read/write and specifies the amount

		of maximum memory zram have consumed to store compressed data.

		For resetting the value, you should write "0". Otherwise,

		you could see -EINVAL.

		Unit: bytes

		Downgraded to write-only node: so it's possible to set new

		value only; its current value is stored in zram<id>/mm_stat

		node.



What:		/sys/block/zram<id>/mem_limit

Date:		August 2015

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The mem_limit file is read/write and specifies the maximum

		amount of memory ZRAM can use to store the compressed data.

		The limit could be changed in run time and "0" means disable

		the limit.  No limit is the initial state.  Unit: bytes

		Downgraded to write-only node: so it's possible to set new

		value only; its current value is stored in zram<id>/mm_stat

		node.

Documentation/ABI/testing/sysfs-block-zram

+8 −93
Original line number Diff line number Diff line
@@ -22,41 +22,6 @@ Description: 
		device. The reset operation frees all the memory associated

		with this device.



What:		/sys/block/zram<id>/num_reads

Date:		August 2010

Contact:	Nitin Gupta <ngupta@vflare.org>

Description:

		The num_reads file is read-only and specifies the number of

		reads (failed or successful) done on this device.



What:		/sys/block/zram<id>/num_writes

Date:		August 2010

Contact:	Nitin Gupta <ngupta@vflare.org>

Description:

		The num_writes file is read-only and specifies the number of

		writes (failed or successful) done on this device.



What:		/sys/block/zram<id>/invalid_io

Date:		August 2010

Contact:	Nitin Gupta <ngupta@vflare.org>

Description:

		The invalid_io file is read-only and specifies the number of

		non-page-size-aligned I/O requests issued to this device.



What:		/sys/block/zram<id>/failed_reads

Date:		February 2014

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The failed_reads file is read-only and specifies the number of

		failed reads happened on this device.



What:		/sys/block/zram<id>/failed_writes

Date:		February 2014

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Description:

		The failed_writes file is read-only and specifies the number of

		failed writes happened on this device.



What:		/sys/block/zram<id>/max_comp_streams

Date:		February 2014

Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
@@ -73,74 +38,24 @@ Description: 
		available and selected compression algorithms, change

		compression algorithm selection.



What:		/sys/block/zram<id>/notify_free

Date:		August 2010

Contact:	Nitin Gupta <ngupta@vflare.org>

Description:

		The notify_free file is read-only. Depending on device usage

		scenario it may account a) the number of pages freed because

		of swap slot free notifications or b) the number of pages freed

		because of REQ_DISCARD requests sent by bio. The former ones

		are sent to a swap block device when a swap slot is freed, which

		implies that this disk is being used as a swap disk. The latter

		ones are sent by filesystem mounted with discard option,

		whenever some data blocks are getting discarded.



What:		/sys/block/zram<id>/zero_pages

Date:		August 2010

Contact:	Nitin Gupta <ngupta@vflare.org>

Description:

		The zero_pages file is read-only and specifies number of zero

		filled pages written to this disk. No memory is allocated for

		such pages.



What:		/sys/block/zram<id>/orig_data_size

Date:		August 2010

Contact:	Nitin Gupta <ngupta@vflare.org>

Description:

		The orig_data_size file is read-only and specifies uncompressed

		size of data stored in this disk. This excludes zero-filled

		pages (zero_pages) since no memory is allocated for them.

		Unit: bytes



What:		/sys/block/zram<id>/compr_data_size

Date:		August 2010

Contact:	Nitin Gupta <ngupta@vflare.org>

Description:

		The compr_data_size file is read-only and specifies compressed

		size of data stored in this disk. So, compression ratio can be

		calculated using orig_data_size and this statistic.

		Unit: bytes



What:		/sys/block/zram<id>/mem_used_total

Date:		August 2010

Contact:	Nitin Gupta <ngupta@vflare.org>

Description:

		The mem_used_total file is read-only and specifies the amount

		of memory, including allocator fragmentation and metadata

		overhead, allocated for this disk. So, allocator space

		efficiency can be calculated using compr_data_size and this

		statistic.

		Unit: bytes



What:		/sys/block/zram<id>/mem_used_max

Date:		August 2014

Contact:	Minchan Kim <minchan@kernel.org>

Description:

		The mem_used_max file is read/write and specifies the amount

		of maximum memory zram have consumed to store compressed data.

		For resetting the value, you should write "0". Otherwise,

		you could see -EINVAL.

		The mem_used_max file is write-only and is used to reset

		the counter of maximum memory zram have consumed to store

		compressed data. For resetting the value, you should write

		"0". Otherwise, you could see -EINVAL.

		Unit: bytes



What:		/sys/block/zram<id>/mem_limit

Date:		August 2014

Contact:	Minchan Kim <minchan@kernel.org>

Description:

		The mem_limit file is read/write and specifies the maximum

		amount of memory ZRAM can use to store the compressed data.  The

		limit could be changed in run time and "0" means disable the

		limit.  No limit is the initial state.  Unit: bytes

		The mem_limit file is write-only and specifies the maximum

		amount of memory ZRAM can use to store the compressed data.

		The limit could be changed in run time and "0" means disable

		the limit. No limit is the initial state.  Unit: bytes



What:		/sys/block/zram<id>/compact

Date:		August 2015

Documentation/admin-guide/kernel-parameters.txt

+8 −0
Original line number Diff line number Diff line
@@ -3694,6 +3694,14 @@ 
			last alloc / free. For more information see

			Documentation/vm/slub.txt.



	slub_memcg_sysfs=	[MM, SLUB]

			Determines whether to enable sysfs directories for

			memory cgroup sub-caches. 1 to enable, 0 to disable.

			The default is determined by CONFIG_SLUB_MEMCG_SYSFS_ON.

			Enabling this can lead to a very high number of	debug

			directories and files being created under

			/sys/kernel/slub.



	slub_max_order= [MM, SLUB]

			Determines the maximum allowed order for slabs.

			A high setting may cause OOMs due to memory

Documentation/blockdev/zram.txt

+32 −42
Original line number Diff line number Diff line
@@ -161,42 +161,14 @@ Name access description 
disksize          RW    show and set the device's disk size

initstate         RO    shows the initialization state of the device

reset             WO    trigger device reset

num_reads         RO    the number of reads

failed_reads      RO    the number of failed reads

num_write         RO    the number of writes

failed_writes     RO    the number of failed writes

invalid_io        RO    the number of non-page-size-aligned I/O requests

mem_used_max      WO    reset the `mem_used_max' counter (see later)

mem_limit         WO    specifies the maximum amount of memory ZRAM can use

                        to store the compressed data

max_comp_streams  RW    the number of possible concurrent compress operations

comp_algorithm    RW    show and change the compression algorithm

notify_free       RO    the number of notifications to free pages (either

                        slot free notifications or REQ_DISCARD requests)

zero_pages        RO    the number of zero filled pages written to this disk

orig_data_size    RO    uncompressed size of data stored in this disk

compr_data_size   RO    compressed size of data stored in this disk

mem_used_total    RO    the amount of memory allocated for this disk

mem_used_max      RW    the maximum amount of memory zram have consumed to

                        store the data (to reset this counter to the actual

                        current value, write 1 to this attribute)

mem_limit         RW    the maximum amount of memory ZRAM can use to store

                        the compressed data

pages_compacted   RO    the number of pages freed during compaction

                        (available only via zram<id>/mm_stat node)

compact           WO    trigger memory compaction

debug_stat        RO    this file is used for zram debugging purposes



WARNING

=======

per-stat sysfs attributes are considered to be deprecated.

The basic strategy is:

-- the existing RW nodes will be downgraded to WO nodes (in linux 4.11)

-- deprecated RO sysfs nodes will eventually be removed (in linux 4.11)



The list of deprecated attributes can be found here:

Documentation/ABI/obsolete/sysfs-block-zram



Basically, every attribute that has its own read accessible sysfs node

(e.g. num_reads) *AND* is accessible via one of the stat files (zram<id>/stat

or zram<id>/io_stat or zram<id>/mm_stat) is considered to be deprecated.



User space is advised to use the following files to read the device statistics.
@@ -211,22 +183,40 @@ The stat file represents device's I/O statistics not accounted by block 
layer and, thus, not available in zram<id>/stat file. It consists of a

single line of text and contains the following stats separated by

whitespace:

	failed_reads

	failed_writes

	invalid_io

	notify_free

 failed_reads     the number of failed reads

 failed_writes    the number of failed writes

 invalid_io       the number of non-page-size-aligned I/O requests

 notify_free      Depending on device usage scenario it may account

                  a) the number of pages freed because of swap slot free

                  notifications or b) the number of pages freed because of

                  REQ_DISCARD requests sent by bio. The former ones are

                  sent to a swap block device when a swap slot is freed,

                  which implies that this disk is being used as a swap disk.

                  The latter ones are sent by filesystem mounted with

                  discard option, whenever some data blocks are getting

                  discarded.



File /sys/block/zram<id>/mm_stat



The stat file represents device's mm statistics. It consists of a single

line of text and contains the following stats separated by whitespace:

	orig_data_size

	compr_data_size

	mem_used_total

	mem_limit

	mem_used_max

	zero_pages

	num_migrated

 orig_data_size   uncompressed size of data stored in this disk.

                  This excludes zero-filled pages (zero_pages) since no

                  memory is allocated for them.

                  Unit: bytes

 compr_data_size  compressed size of data stored in this disk

 mem_used_total   the amount of memory allocated for this disk. This

                  includes allocator fragmentation and metadata overhead,

                  allocated for this disk. So, allocator space efficiency

                  can be calculated using compr_data_size and this statistic.

                  Unit: bytes

 mem_limit        the maximum amount of memory ZRAM can use to store

                  the compressed data

 mem_used_max     the maximum amount of memory zram have consumed to

                  store the data

 zero_pages       the number of zero filled pages written to this disk.

                  No memory is allocated for such pages.

 pages_compacted  the number of pages freed during compaction



9) Deactivate:

	swapoff /dev/zram0

Documentation/trace/postprocess/trace-vmscan-postprocess.pl

+13 −13
Original line number Diff line number Diff line
@@ -112,8 +112,8 @@ my $regex_direct_end_default = 'nr_reclaimed=([0-9]*)'; 
my $regex_kswapd_wake_default = 'nid=([0-9]*) order=([0-9]*)';

my $regex_kswapd_sleep_default = 'nid=([0-9]*)';

my $regex_wakeup_kswapd_default = 'nid=([0-9]*) zid=([0-9]*) order=([0-9]*)';

my $regex_lru_isolate_default = 'isolate_mode=([0-9]*) order=([0-9]*) nr_requested=([0-9]*) nr_scanned=([0-9]*) nr_taken=([0-9]*) file=([0-9]*)';

my $regex_lru_shrink_inactive_default = 'nid=([0-9]*) zid=([0-9]*) nr_scanned=([0-9]*) nr_reclaimed=([0-9]*) priority=([0-9]*) flags=([A-Z_|]*)';

my $regex_lru_isolate_default = 'isolate_mode=([0-9]*) classzone_idx=([0-9]*) order=([0-9]*) nr_requested=([0-9]*) nr_scanned=([0-9]*) nr_skipped=([0-9]*) nr_taken=([0-9]*) lru=([a-z_]*)';

my $regex_lru_shrink_inactive_default = 'nid=([0-9]*) nr_scanned=([0-9]*) nr_reclaimed=([0-9]*) nr_dirty=([0-9]*) nr_writeback=([0-9]*) nr_congested=([0-9]*) nr_immediate=([0-9]*) nr_activate=([0-9]*) nr_ref_keep=([0-9]*) nr_unmap_fail=([0-9]*) priority=([0-9]*) flags=([A-Z_|]*)';

my $regex_lru_shrink_active_default = 'lru=([A-Z_]*) nr_scanned=([0-9]*) nr_rotated=([0-9]*) priority=([0-9]*)';

my $regex_writepage_default = 'page=([0-9a-f]*) pfn=([0-9]*) flags=([A-Z_|]*)';
@@ -205,15 +205,15 @@ $regex_wakeup_kswapd = generate_traceevent_regex( 
$regex_lru_isolate = generate_traceevent_regex(

			"vmscan/mm_vmscan_lru_isolate",

			$regex_lru_isolate_default,

			"isolate_mode", "order",

			"nr_requested", "nr_scanned", "nr_taken",

			"file");

			"isolate_mode", "classzone_idx", "order",

			"nr_requested", "nr_scanned", "nr_skipped", "nr_taken",

			"lru");

$regex_lru_shrink_inactive = generate_traceevent_regex(

			"vmscan/mm_vmscan_lru_shrink_inactive",

			$regex_lru_shrink_inactive_default,

			"nid", "zid",

			"nr_scanned", "nr_reclaimed", "priority",

			"flags");

			"nid", "nr_scanned", "nr_reclaimed", "nr_dirty", "nr_writeback",

			"nr_congested", "nr_immediate", "nr_activate", "nr_ref_keep",

			"nr_unmap_fail", "priority", "flags");

$regex_lru_shrink_active = generate_traceevent_regex(

			"vmscan/mm_vmscan_lru_shrink_active",

			$regex_lru_shrink_active_default,
@@ -381,8 +381,8 @@ EVENT_PROCESS: 
				next;

			}

			my $isolate_mode = $1;

			my $nr_scanned = $4;

			my $file = $6;

			my $nr_scanned = $5;

			my $file = $8;



			# To closer match vmstat scanning statistics, only count isolate_both

			# and isolate_inactive as scanning. isolate_active is rotation
@@ -391,7 +391,7 @@ EVENT_PROCESS: 
			# isolate_both     == 3

			if ($isolate_mode != 2) {

				$perprocesspid{$process_pid}->{HIGH_NR_SCANNED} += $nr_scanned;

				if ($file == 1) {

				if ($file =~ /_file/) {

					$perprocesspid{$process_pid}->{HIGH_NR_FILE_SCANNED} += $nr_scanned;

				} else {

					$perprocesspid{$process_pid}->{HIGH_NR_ANON_SCANNED} += $nr_scanned;
@@ -406,8 +406,8 @@ EVENT_PROCESS: 
				next;

			}



			my $nr_reclaimed = $4;

			my $flags = $6;

			my $nr_reclaimed = $3;

			my $flags = $12;

			my $file = 0;

			if ($flags =~ /RECLAIM_WB_FILE/) {

				$file = 1;