Eric Lee / smarc-fsl-linux-kernel

12 Sep, 2019

1 commit

03 Sep, 2019

1 commit

17 Jul, 2019

1 commit

  • c309b6f24   Merge tag 'docs/v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media ... Browse Code »

    Pull rst conversion of docs from Mauro Carvalho Chehab:
    "As agreed with Jon, I'm sending this big series directly to you, c/c
    him, as this series required a special care, in order to avoid
    conflicts with other trees"

    * tag 'docs/v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (77 commits)
    docs: kbuild: fix build with pdf and fix some minor issues
    docs: block: fix pdf output
    docs: arm: fix a breakage with pdf output
    docs: don't use nested tables
    docs: gpio: add sysfs interface to the admin-guide
    docs: locking: add it to the main index
    docs: add some directories to the main documentation index
    docs: add SPDX tags to new index files
    docs: add a memory-devices subdir to driver-api
    docs: phy: place documentation under driver-api
    docs: serial: move it to the driver-api
    docs: driver-api: add remaining converted dirs to it
    docs: driver-api: add xilinx driver API documentation
    docs: driver-api: add a series of orphaned documents
    docs: admin-guide: add a series of orphaned documents
    docs: cgroup-v1: add it to the admin-guide book
    docs: aoe: add it to the driver-api book
    docs: add some documentation dirs to the driver-api book
    docs: driver-model: move it to the driver-api book
    docs: lp855x-driver.rst: add it to the driver-api book
    ...

    Linus Torvalds
     

15 Jul, 2019

4 commits

11 Jul, 2019

1 commit

  • 36847a005   block: Remove unused definitions ... Browse Code »

    The ELV_MQUEUE_XXX definitions in include/linux/elevator.h are unused
    since the removal of elevator_may_queue_fn in kernel 5.0. Remove these
    definitions and also remove the documentation of elevator_may_queue_fn
    in Documentiation/block/biodoc.txt.

    Acked-by: Marcos Paulo de Souza
    Signed-off-by: Damien Le Moal
    Signed-off-by: Jens Axboe

    Damien Le Moal
     

10 Jul, 2019

1 commit

  • 3b99107f0   Merge tag 'for-5.3/block-20190708' of git://git.kernel.dk/linux-block ... Browse Code »

    Pull block updates from Jens Axboe:
    "This is the main block updates for 5.3. Nothing earth shattering or
    major in here, just fixes, additions, and improvements all over the
    map. This contains:

    - Series of documentation fixes (Bart)

    - Optimization of the blk-mq ctx get/put (Bart)

    - null_blk removal race condition fix (Bob)

    - req/bio_op() cleanups (Chaitanya)

    - Series cleaning up the segment accounting, and request/bio mapping
    (Christoph)

    - Series cleaning up the page getting/putting for bios (Christoph)

    - block cgroup cleanups and moving it to where it is used (Christoph)

    - block cgroup fixes (Tejun)

    - Series of fixes and improvements to bcache, most notably a write
    deadlock fix (Coly)

    - blk-iolatency STS_AGAIN and accounting fixes (Dennis)

    - Series of improvements and fixes to BFQ (Douglas, Paolo)

    - debugfs_create() return value check removal for drbd (Greg)

    - Use struct_size(), where appropriate (Gustavo)

    - Two lighnvm fixes (Heiner, Geert)

    - MD fixes, including a read balance and corruption fix (Guoqing,
    Marcos, Xiao, Yufen)

    - block opal shadow mbr additions (Jonas, Revanth)

    - sbitmap compare-and-exhange improvemnts (Pavel)

    - Fix for potential bio->bi_size overflow (Ming)

    - NVMe pull requests:
    - improved PCIe suspent support (Keith Busch)
    - error injection support for the admin queue (Akinobu Mita)
    - Fibre Channel discovery improvements (James Smart)
    - tracing improvements including nvmetc tracing support (Minwoo Im)
    - misc fixes and cleanups (Anton Eidelman, Minwoo Im, Chaitanya
    Kulkarni)"

    - Various little fixes and improvements to drivers and core"

    * tag 'for-5.3/block-20190708' of git://git.kernel.dk/linux-block: (153 commits)
    blk-iolatency: fix STS_AGAIN handling
    block: nr_phys_segments needs to be zero for REQ_OP_WRITE_ZEROES
    blk-mq: simplify blk_mq_make_request()
    blk-mq: remove blk_mq_put_ctx()
    sbitmap: Replace cmpxchg with xchg
    block: fix .bi_size overflow
    block: sed-opal: check size of shadow mbr
    block: sed-opal: ioctl for writing to shadow mbr
    block: sed-opal: add ioctl for done-mark of shadow mbr
    block: never take page references for ITER_BVEC
    direct-io: use bio_release_pages in dio_bio_complete
    block_dev: use bio_release_pages in bio_unmap_user
    block_dev: use bio_release_pages in blkdev_bio_end_io
    iomap: use bio_release_pages in iomap_dio_bio_end_io
    block: use bio_release_pages in bio_map_user_iov
    block: use bio_release_pages in bio_unmap_user
    block: optionally mark pages dirty in bio_release_pages
    block: move the BIO_NO_PAGE_REF check into bio_release_pages
    block: skd_main.c: Remove call to memset after dma_alloc_coherent
    block: mtip32xx: Remove call to memset after dma_alloc_coherent
    ...

    Linus Torvalds
     

09 Jul, 2019

1 commit

29 Jun, 2019

4 commits

21 Jun, 2019

2 commits

  • 8060c47ba   block: rename CONFIG_DEBUG_BLK_CGROUP to CONFIG_BFQ_CGROUP_DEBUG ... Browse Code »

    This option is entirely bfq specific, give it an appropinquate name.

    Also make it depend on CONFIG_BFQ_GROUP_IOSCHED in Kconfig, as all
    the functionality already does so anyway.

    Acked-by: Tejun Heo
    Acked-by: Paolo Valente
    Signed-off-by: Christoph Hellwig
    Signed-off-by: Jens Axboe

    Christoph Hellwig
     
  • 14ccb66b3   block: remove the bi_phys_segments field in struct bio ... Browse Code »

    We only need the number of segments in the blk-mq submission path.
    Remove the field from struct bio, and return it from a variant of
    blk_queue_split instead of that it can passed as an argument to
    those functions that need the value.

    This also means we stop recounting segments except for cloning
    and partial segments.

    To keep the number of arguments in this how path down remove
    pointless struct request_queue arguments from any of the functions
    that had it and grew a nr_segs argument.

    Signed-off-by: Christoph Hellwig
    Signed-off-by: Jens Axboe

    Christoph Hellwig
     

15 Jun, 2019

1 commit

  • 99c8b231a   docs: cgroup-v1: convert docs to ReST and rename to *.rst ... Browse Code »

    Convert the cgroup-v1 files to ReST format, in order to
    allow a later addition to the admin-guide.

    The conversion is actually:
    - add blank lines and identation in order to identify paragraphs;
    - fix tables markups;
    - add some lists markups;
    - mark literal blocks;
    - adjust title markups.

    At its new index.rst, let's add a :orphan: while this is not linked to
    the main index.rst file, in order to avoid build warnings.

    Signed-off-by: Mauro Carvalho Chehab
    Acked-by: Tejun Heo
    Signed-off-by: Tejun Heo

    Mauro Carvalho Chehab
     

13 Jun, 2019

1 commit

09 Apr, 2019

1 commit

01 Apr, 2019

1 commit

15 Feb, 2019

1 commit

  • ac4fa1d10   block: document usage of bio iterator helpers ... Browse Code »

    Now multi-page bvec is supported, some helpers may return page by
    page, meantime some may return segment by segment, this patch
    documents the usage.

    Reviewed-by: Christoph Hellwig
    Reviewed-by: Omar Sandoval
    Signed-off-by: Ming Lei
    Signed-off-by: Jens Axboe

    Ming Lei
     

09 Jan, 2019

1 commit

  • 47cb393ee   block: doc: add slice_idle_us to bfq documentation ... Browse Code »

    Of the tunables available for the bfq I/O scheduler, the only one
    missing from the documentation in 'Documentation/block/bfq-iosched.txt'
    is slice_idle_us. Add this tunable to the documentation and a short
    explanation of its purpose.

    Acked-by: Paolo Valente
    Signed-off-by: John Pittman
    Signed-off-by: Jens Axboe

    John Pittman
     

07 Jan, 2019

1 commit

  • 373282e7a   null_blk: add zoned config support information ... Browse Code »

    If the kernel is built without CONFIG_BLK_DEV_ZONED, a modprobe
    of the null_blk driver with zoned=1 fails with 'Invalid argument'.
    This can be confusing to users, prompting a search as to why the
    parameter is invalid. To assist in that search, add a bit more
    information to the failure, additionally adding to the documentation
    that CONFIG_BLK_DEV_ZONED is needed for zoned=1.

    Reviewed-by: Bart Van Assche
    Signed-off-by: John Pittman

    Added null_blk prefix to error message.

    Signed-off-by: Jens Axboe

    John Pittman
     

05 Jan, 2019

1 commit

17 Dec, 2018

1 commit

  • f9824952e   block: update sysfs documentation ... Browse Code »

    Add the description of the zoned, nr_zones and chunk_sectors sysfs queue
    attributes to Documentation/block/queue-sysfs.txt. The description of
    the zoned and chunk_sector attributes are mostly copied from
    ABI/testing/sysfs-block (added a typo fix). While at it, also fix a
    typo in the description of the io_poll_delay attribute.

    nr_zones description is also added to ABI/testing/sysfs-block and
    contact email address updated for the zoned attribute.

    Signed-off-by: Damien Le Moal
    Signed-off-by: Jens Axboe

    Damien Le Moal
     

08 Nov, 2018

2 commits

10 Sep, 2018

1 commit

  • a7ddcea58   Drop all 00-INDEX files from Documentation/ ... Browse Code »

    This is a respin with a wider audience (all that get_maintainer returned)
    and I know this spams a *lot* of people. Not sure what would be the correct
    way, so my apologies for ruining your inbox.

    The 00-INDEX files are supposed to give a summary of all files present
    in a directory, but these files are horribly out of date and their
    usefulness is brought into question. Often a simple "ls" would reveal
    the same information as the filenames are generally quite descriptive as
    a short introduction to what the file covers (it should not surprise
    anyone what Documentation/sched/sched-design-CFS.txt covers)

    A few years back it was mentioned that these files were no longer really
    needed, and they have since then grown further out of date, so perhaps
    it is time to just throw them out.

    A short status yields the following _outdated_ 00-INDEX files, first
    counter is files listed in 00-INDEX but missing in the directory, last
    is files present but not listed in 00-INDEX.

    List of outdated 00-INDEX:
    Documentation: (4/10)
    Documentation/sysctl: (0/1)
    Documentation/timers: (1/0)
    Documentation/blockdev: (3/1)
    Documentation/w1/slaves: (0/1)
    Documentation/locking: (0/1)
    Documentation/devicetree: (0/5)
    Documentation/power: (1/1)
    Documentation/powerpc: (0/5)
    Documentation/arm: (1/0)
    Documentation/x86: (0/9)
    Documentation/x86/x86_64: (1/1)
    Documentation/scsi: (4/4)
    Documentation/filesystems: (2/9)
    Documentation/filesystems/nfs: (0/2)
    Documentation/cgroup-v1: (0/2)
    Documentation/kbuild: (0/4)
    Documentation/spi: (1/0)
    Documentation/virtual/kvm: (1/0)
    Documentation/scheduler: (0/2)
    Documentation/fb: (0/1)
    Documentation/block: (0/1)
    Documentation/networking: (6/37)
    Documentation/vm: (1/3)

    Then there are 364 subdirectories in Documentation/ with several files that
    are missing 00-INDEX alltogether (and another 120 with a single file and no
    00-INDEX).

    I don't really have an opinion to whether or not we /should/ have 00-INDEX,
    but the above 00-INDEX should either be removed or be kept up to date. If
    we should keep the files, I can try to keep them updated, but I rather not
    if we just want to delete them anyway.

    As a starting point, remove all index-files and references to 00-INDEX and
    see where the discussion is going.

    Signed-off-by: Henrik Austad
    Acked-by: "Paul E. McKenney"
    Just-do-it-by: Steven Rostedt
    Reviewed-by: Jens Axboe
    Acked-by: Paul Moore
    Acked-by: Greg Kroah-Hartman
    Acked-by: Mark Brown
    Acked-by: Mike Rapoport
    Cc: [Almost everybody else]
    Signed-off-by: Jonathan Corbet

    Henrik Austad
     

18 Jul, 2018

1 commit

  • bdca3c87f   block: Track DISCARD statistics and output them in stat and diskstat ... Browse Code »

    Add tracking of REQ_OP_DISCARD ios to the partition statistics and
    append them to the various stat files in /sys as well as
    /proc/diskstats. These are tracked with the same four stats as reads
    and writes:

    Number of discard ios completed.
    Number of discard ios merged
    Number of discard sectors completed
    Milliseconds spent on discard requests

    This is done via adding a new STAT_DISCARD define to genhd.h and then
    using it to index that stat field for discard requests.

    tj: Refreshed on top of v4.17 and other previous updates.

    Signed-off-by: Michael Callahan
    Signed-off-by: Tejun Heo
    Cc: Andy Newell
    Signed-off-by: Jens Axboe

    Michael Callahan
     

09 Jul, 2018

1 commit

  • ca4b2a011   null_blk: add zone support ... Browse Code »

    Adds support for exposing a null_blk device through the zone device
    interface.

    The interface is managed with the parameters zoned and zone_size.
    If zoned is set, the null_blk instance registers as a zoned block
    device. The zone_size parameter defines how big each zone will be.

    Signed-off-by: Matias Bjørling
    Signed-off-by: Bart Van Assche
    Signed-off-by: Damien Le Moal
    Signed-off-by: Jens Axboe

    Matias Bjørling
     

15 Jun, 2018

1 commit

05 Jun, 2018

1 commit

  • eeee3149a   Merge tag 'docs-4.18' of git://git.lwn.net/linux ... Browse Code »

    Pull documentation updates from Jonathan Corbet:
    "There's been a fair amount of work in the docs tree this time around,
    including:

    - Extensive RST conversions and organizational work in the
    memory-management docs thanks to Mike Rapoport.

    - An update of Documentation/features from Andrea Parri and a script
    to keep it updated.

    - Various LICENSES updates from Thomas, along with a script to check
    SPDX tags.

    - Work to fix dangling references to documentation files; this
    involved a fair number of one-liner comment changes outside of
    Documentation/

    ... and the usual list of documentation improvements, typo fixes, etc"

    * tag 'docs-4.18' of git://git.lwn.net/linux: (103 commits)
    Documentation: document hung_task_panic kernel parameter
    docs/admin-guide/mm: add high level concepts overview
    docs/vm: move ksm and transhuge from "user" to "internals" section.
    docs: Use the kerneldoc comments for memalloc_no*()
    doc: document scope NOFS, NOIO APIs
    docs: update kernel versions and dates in tables
    docs/vm: transhuge: split userspace bits to admin-guide/mm/transhuge
    docs/vm: transhuge: minor updates
    docs/vm: transhuge: change sections order
    Documentation: arm: clean up Marvell Berlin family info
    Documentation: gpio: driver: Fix a typo and some odd grammar
    docs: ranoops.rst: fix location of ramoops.txt
    scripts/documentation-file-ref-check: rewrite it in perl with auto-fix mode
    docs: uio-howto.rst: use a code block to solve a warning
    mm, THP, doc: Add document for thp_swpout/thp_swpout_fallback
    w1: w1_io.c: fix a kernel-doc warning
    Documentation/process/posting: wrap text at 80 cols
    docs: admin-guide: add cgroup-v2 documentation
    Revert "Documentation/features/vm: Remove arch support status file for 'pte_special'"
    Documentation: refcount-vs-atomic: Update reference to LKMM doc.
    ...

    Linus Torvalds
     

25 May, 2018

1 commit

08 May, 2018

1 commit

15 Nov, 2017

3 commits

  • a33801e8b   block, bfq: move debug blkio stats behind CONFIG_DEBUG_BLK_CGROUP ... Browse Code »

    BFQ currently creates, and updates, its own instance of the whole
    set of blkio statistics that cfq creates. Yet, from the comments
    of Tejun Heo in [1], it turned out that most of these statistics
    are meant/useful only for debugging. This commit makes BFQ create
    the latter, debugging statistics only if the option
    CONFIG_DEBUG_BLK_CGROUP is set.

    By doing so, this commit also enables BFQ to enjoy a high perfomance
    boost. The reason is that, if CONFIG_DEBUG_BLK_CGROUP is not set, then
    BFQ has to update far fewer statistics, and, in particular, not the
    heaviest to update. To give an idea of the benefits, if
    CONFIG_DEBUG_BLK_CGROUP is not set, then, on an Intel i7-4850HQ, and
    with 8 threads doing random I/O in parallel on null_blk (configured
    with 0 latency), the throughput of BFQ grows from 310 to 400 KIOPS
    (+30%). We have measured similar or even much higher boosts with other
    CPUs: e.g., +45% with an ARM CortexTM-A53 Octa-core. Our results have
    been obtained and can be reproduced very easily with the script in [1].

    [1] https://www.spinics.net/lists/linux-block/msg18943.html

    Suggested-by: Tejun Heo
    Suggested-by: Ulf Hansson
    Tested-by: Lee Tibbert
    Tested-by: Oleksandr Natalenko
    Signed-off-by: Luca Miccio
    Signed-off-by: Paolo Valente
    Signed-off-by: Jens Axboe

    Luca Miccio
     
  • 24bfd19bb   block, bfq: update blkio stats outside the scheduler lock ... Browse Code »

    bfq invokes various blkg_*stats_* functions to update the statistics
    contained in the special files blkio.bfq.* in the blkio controller
    groups, i.e., the I/O accounting related to the proportional-share
    policy provided by bfq. The execution of these functions takes a
    considerable percentage, about 40%, of the total per-request execution
    time of bfq (i.e., of the sum of the execution time of all the bfq
    functions that have to be executed to process an I/O request from its
    creation to its destruction). This reduces the request-processing
    rate sustainable by bfq noticeably, even on a multicore CPU. In fact,
    the bfq functions that invoke blkg_*stats_* functions cannot be
    executed in parallel with the rest of the code of bfq, because both
    are executed under the same same per-device scheduler lock.

    To reduce this slowdown, this commit moves, wherever possible, the
    invocation of these functions (more precisely, of the bfq functions
    that invoke blkg_*stats_* functions) outside the critical sections
    protected by the scheduler lock.

    With this change, and with all blkio.bfq.* statistics enabled, the
    throughput grows, e.g., from 250 to 310 KIOPS (+25%) on an Intel
    i7-4850HQ, in case of 8 threads doing random I/O in parallel on
    null_blk, with the latter configured with 0 latency. We obtained the
    same or higher throughput boosts, up to +30%, with other processors
    (some figures are reported in the documentation). For our tests, we
    used the script [1], with which our results can be easily reproduced.

    NOTE. This commit still protects the invocation of blkg_*stats_*
    functions with the request_queue lock, because the group these
    functions are invoked on may otherwise disappear before or while these
    functions are executed. Fortunately, tests without even this lock
    show, by difference, that the serialization caused by this lock has a
    little impact (at most ~5% of throughput reduction).

    [1] https://github.com/Algodev-github/IOSpeed

    Tested-by: Lee Tibbert
    Tested-by: Oleksandr Natalenko
    Signed-off-by: Paolo Valente
    Signed-off-by: Luca Miccio
    Signed-off-by: Jens Axboe

    Paolo Valente
     
  • 68017e5d8   doc, block, bfq: update max IOPS sustainable with BFQ ... Browse Code »

    We have investigated more deeply the performance of BFQ, in terms of
    number of IOPS that can be processed by the CPU when BFQ is used as
    I/O scheduler. In more detail, using the script [1], we have measured
    the number of IOPS reached on top of a null block device configured
    with zero latency, as a function of the workload (sequential read,
    sequential write, random read, random write) and of the system (we
    considered desktops, laptops and embedded systems).

    Basing on the resulting figures, with this commit we update the
    current, conservative IOPS range reported in BFQ documentation. In
    particular, the documentation now reports, for each of three different
    systems, the lowest number of IOPS obtained for that system with the
    above test (namely, the value obtained with the workload leading to
    the lowest IOPS).

    [1] https://github.com/Algodev-github/IOSpeed

    Reviewed-by: Lee Tibbert
    Signed-off-by: Paolo Valente
    Signed-off-by: Luca Miccio
    Signed-off-by: Jens Axboe

    Paolo Valente
     

11 Nov, 2017

2 commits

08 Nov, 2017

1 commit