linux-toradex.git/Documentation/admin-guide/blockdev, branch v5.17-rc1

docs: admin-guide/blockdev: Remove digraph of node-states

2021-11-29T21:39:43+00:00

While node-states-8.dot has two digraphs, the dot(1) command can
not properly handle multiple graphs in a DOT file and the
kernel-doc page at

    https://www.kernel.org/doc/html/latest/admin-guide/blockdev/drbd/figures.html

fails to render the graphs.

It turned out that the digraph of node_states can be removed.

Quote from Joel's reflection:

    On reflection, the digraph node_states can be removed entirely.
    It is too basic to contain any useful information. In addition
    it references "ioctl_set_state". The ioctl configuration
    interface for DRBD has long been removed. In fact, it was never
    in the upstream version of DRBD.

Remove node_states and rename the DOT file peer_states-8.dot.

Suggested-by: Joel Colledge 
Acked-by: Joel Colledge 
Signed-off-by: Akira Yokosawa 
Cc: Philipp Reisner 
Cc: Lars Ellenberg 
Link: https://lore.kernel.org/r/7df04f45-8746-e666-1a9d-a998f1ab1f91@gmail.com
Signed-off-by: Jonathan Corbet

zram: introduce an aged idle interface

2021-11-06T20:30:43+00:00

This change introduces an aged idle interface to the existing idle sysfs
file for zram.

When CONFIG_ZRAM_MEMORY_TRACKING is enabled the idle file now also
accepts an integer argument.  This integer is the age (in seconds) of
pages to mark as idle.  The idle file still supports 'all' as it always
has.  This new approach allows for much more control over which pages
get marked as idle.

[bgeffon@google.com: use IS_ENABLED and cleanup comment]
  Link: https://lkml.kernel.org/r/20210924161128.1508015-1-bgeffon@google.com
[bgeffon@google.com: Sergey's cleanup suggestions]
  Link: https://lkml.kernel.org/r/20210929143056.13067-1-bgeffon@google.com

Link: https://lkml.kernel.org/r/20210923130115.1344361-1-bgeffon@google.com
Signed-off-by: Brian Geffon 
Acked-by: Minchan Kim 
Reviewed-by: Sergey Senozhatsky 
Cc: Nitin Gupta 
Cc: Jonathan Corbet 
Cc: Suleiman Souhlal 
Cc: Jesse Barnes 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'akpm' (patches from Andrew)

2020-12-15T20:53:37+00:00

Merge misc updates from Andrew Morton:

 - a few random little subsystems

 - almost all of the MM patches which are staged ahead of linux-next
   material. I'll trickle to post-linux-next work in as the dependents
   get merged up.

Subsystems affected by this patch series: kthread, kbuild, ide, ntfs,
ocfs2, arch, and mm (slab-generic, slab, slub, dax, debug, pagecache,
gup, swap, shmem, memcg, pagemap, mremap, hmm, vmalloc, documentation,
kasan, pagealloc, memory-failure, hugetlb, vmscan, z3fold, compaction,
oom-kill, migration, cma, page-poison, userfaultfd, zswap, zsmalloc,
uaccess, zram, and cleanups).

* emailed patches from Andrew Morton : (200 commits)
  mm: cleanup kstrto*() usage
  mm: fix fall-through warnings for Clang
  mm: slub: convert sysfs sprintf family to sysfs_emit/sysfs_emit_at
  mm: shmem: convert shmem_enabled_show to use sysfs_emit_at
  mm:backing-dev: use sysfs_emit in macro defining functions
  mm: huge_memory: convert remaining use of sprintf to sysfs_emit and neatening
  mm: use sysfs_emit for struct kobject * uses
  mm: fix kernel-doc markups
  zram: break the strict dependency from lzo
  zram: add stat to gather incompressible pages since zram set up
  zram: support page writeback
  mm/process_vm_access: remove redundant initialization of iov_r
  mm/zsmalloc.c: rework the list_add code in insert_zspage()
  mm/zswap: move to use crypto_acomp API for hardware acceleration
  mm/zswap: fix passing zero to 'PTR_ERR' warning
  mm/zswap: make struct kernel_param_ops definitions const
  userfaultfd/selftests: hint the test runner on required privilege
  userfaultfd/selftests: fix retval check for userfaultfd_open()
  userfaultfd/selftests: always dump something in modes
  userfaultfd: selftests: make __{s,u}64 format specifiers portable
  ...

zram: add stat to gather incompressible pages since zram set up

2020-12-15T20:13:47+00:00

Currently, zram supports the stat via /sys/block/zram/mm_stat to represent
how many of incompressible pages are stored at the moment but it couldn't
show how many times incompressible pages were wrote down since zram set
up.  It's also good indication to see how zram is effective in the system.

Link: https://lkml.kernel.org/r/20201130201907.1284910-1-minchan@kernel.org
Signed-off-by: Minchan Kim 
Reviewed-by: Sergey Senozhatsky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

zram: support page writeback

2020-12-15T20:13:47+00:00

There is demand to writeback specific process pages to backing store
instead of all idles pages in the system due to storage wear out concerns
and to launching latency of apps which are most of the time idle but are
critical for resume latency.

This patch extends the writeback knob to support a specific page
writeback.

Link: https://lkml.kernel.org/r/20201020190506.3758660-1-minchan@kernel.org
Signed-off-by: Minchan Kim 
Reviewed-by: Sergey Senozhatsky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Documentation: fix typos found in admin-guide subdirectory

2020-12-08T17:25:42+00:00

Fixed twelve typos in cppc_sysfs.rst, binderfs.rst, paride.rst,
zram.rst, bug-hunting.rst, introduction.rst, usage.rst, dm-crypt.rst

Signed-off-by: Andrew Klychkov 
Reviewed-by: Jonathan Corbet 
Reviewed-by: Randy Dunlap 
Link: https://lore.kernel.org/r/20201204070235.GA48631@spblnx124.lan
Signed-off-by: Jonathan Corbet

Documentation/admin-guide: blockdev/ramdisk: remove use of "rdev"

2020-09-24T16:50:31+00:00

Remove use of "rdev" from blockdev/ramdisk.rst and update
admin-guide/kernel-parameters.txt.

"rdev" is considered antiquated, ancient, archaic, obsolete, deprecated
{choose any or all}.

"rdev" was removed from util-linux in 2010:
  https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/commit/?id=a3e40c14651fccf18e7954f081e601389baefe3f

Signed-off-by: Randy Dunlap 
Cc: Karel Zak 
Cc: Paul Gortmaker 
Cc: Jens Axboe 
Cc: linux-block@vger.kernel.org
Cc: Alexander Viro 
Cc: Martin Mares 
Cc: linux-video@atrey.karlin.mff.cuni.cz
Cc: "H. Peter Anvin" 
Cc: Jonathan Corbet 
Cc: linux-doc@vger.kernel.org
Link: https://lore.kernel.org/r/20200918015640.8439-3-rdunlap@infradead.org
Signed-off-by: Jonathan Corbet

Replace HTTP links with HTTPS ones: DRBD driver

2020-07-05T20:16:44+00:00

Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
          If both the HTTP and HTTPS versions
          return 200 OK and serve the same content:
            Replace HTTP with HTTPS.

Signed-off-by: Alexander A. Klimov 
Link: https://lore.kernel.org/r/20200627103111.71771-1-grandmaster@al2klimov.de
Signed-off-by: Jonathan Corbet

Documentation: zram: fix the description about orig_data_size of mm_stat

2020-02-13T18:33:32+00:00

orig_data_size counted the same_pages by commit 51f9f82c855d ("zram:
count same page write as page_stored"), so let's fix it.

Signed-off-by: Yue Hu 
Link: https://lore.kernel.org/r/20200206111031.9524-1-zbestahu@gmail.com
Signed-off-by: Jonathan Corbet

zram: correct documentation about sysfs node of huge page writeback

2020-01-24T16:52:05+00:00

sysfs node for huge page writeback is writeback rather than write.

Signed-off-by: Yue Hu 
Acked-by: Minchan Kim 
Link: https://lore.kernel.org/r/20200120102949.12132-1-zbestahu@gmail.com
Signed-off-by: Jonathan Corbet