Eric Lee / smarc-fsl-linux-kernel

20 Jul, 2007

1 commit

  • 20c2df83d   mm: Remove slab destructors from kmem_cache_create(). ... Browse Code »

    Slab destructors were no longer supported after Christoph's
    c59def9f222d44bb7e2f0a559f2906191a0862d7 change. They've been
    BUGs for both slab and slub, and slob never supported them
    either.

    This rips out support for the dtor pointer from kmem_cache_create()
    completely and fixes up every single callsite in the kernel (there were
    about 224, not including the slab allocator definitions themselves,
    or the documentation references).

    Signed-off-by: Paul Mundt

    Paul Mundt
     

10 Jul, 2007

1 commit

08 May, 2007

1 commit

  • 0a31bd5f2   KMEM_CACHE(): simplify slab cache creation ... Browse Code »

    This patch provides a new macro

    KMEM_CACHE(, )

    to simplify slab creation. KMEM_CACHE creates a slab with the name of the
    struct, with the size of the struct and with the alignment of the struct.
    Additional slab flags may be specified if necessary.

    Example

    struct test_slab {
    int a,b,c;
    struct list_head;
    } __cacheline_aligned_in_smp;

    test_slab_cache = KMEM_CACHE(test_slab, SLAB_PANIC)

    will create a new slab named "test_slab" of the size sizeof(struct
    test_slab) and aligned to the alignment of test slab. If it fails then we
    panic.

    Signed-off-by: Christoph Lameter
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Christoph Lameter
     

30 Apr, 2007

1 commit

  • 5972511b7   [BLOCK] Don't pin lots of memory in mempools ... Browse Code »

    Currently we scale the mempool sizes depending on memory installed
    in the machine, except for the bio pool itself which sits at a fixed
    256 entry pre-allocation.

    There's really no point in "optimizing" this OOM path, we just need
    enough preallocated to make progress. A single unit is enough, lets
    scale it down to 2 just to be on the safe side.

    This patch saves ~150kb of pinned kernel memory on a 32-bit box.

    Signed-off-by: Jens Axboe

    Jens Axboe
     

14 Dec, 2006

1 commit

  • e61c90188   [PATCH] optimize o_direct on block devices ... Browse Code »

    Implement block device specific .direct_IO method instead of going through
    generic direct_io_worker for block device.

    direct_io_worker() is fairly complex because it needs to handle O_DIRECT on
    file system, where it needs to perform block allocation, hole detection,
    extents file on write, and tons of other corner cases. The end result is
    that it takes tons of CPU time to submit an I/O.

    For block device, the block allocation is much simpler and a tight triple
    loop can be written to iterate each iovec and each page within the iovec in
    order to construct/prepare bio structure and then subsequently submit it to
    the block layer. This significantly speeds up O_D on block device.

    [akpm@osdl.org: small speedup]
    Signed-off-by: Ken Chen
    Cc: Christoph Hellwig
    Cc: Zach Brown
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Chen, Kenneth W
     

08 Dec, 2006

1 commit

  • e18b890bb   [PATCH] slab: remove kmem_cache_t ... Browse Code »

    Replace all uses of kmem_cache_t with struct kmem_cache.

    The patch was generated using the following script:

    #!/bin/sh
    #
    # Replace one string by another in all the kernel sources.
    #

    set -e

    for file in `find * -name "*.c" -o -name "*.h"|xargs grep -l $1`; do
    quilt add $file
    sed -e "1,\$s/$1/$2/g" $file >/tmp/$$
    mv /tmp/$$ $file
    quilt refresh
    done

    The script was run like this

    sh replace kmem_cache_t "struct kmem_cache"

    Signed-off-by: Christoph Lameter
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Christoph Lameter
     

05 Dec, 2006

1 commit

01 Dec, 2006

2 commits

  • 0e75f9063   [PATCH] block: support larger block pc requests ... Browse Code »

    This patch modifies blk_rq_map/unmap_user() and the cdrom and scsi_ioctl.c
    users so that it supports requests larger than bio by chaining them together.

    Signed-off-by: Mike Christie
    Signed-off-by: Jens Axboe

    Mike Christie
     
  • ad2d72257   [PATCH] block: kill length alignment test in bio_map_user() ... Browse Code »

    The target mode support is mapping in bios using bio_map_user. The
    current targets do not need their len to be aligned with a queue limit
    so this check is causing some problems. Note: pointers passed into the
    kernel are properly aligned by usersapace tgt code so the uaddr check
    in bio_map_user is ok.

    The major user, blk_bio_map_user checks for the len before mapping
    so it is not affected by this patch.

    And the semi-newly added user blk_rq_map_user_iov has been failing
    out when the len is not aligned properly so maybe people have been
    good and not sending misaligned lens or that path is not used very
    often and this change will not be very dangerous. st and sg do not
    check the length and we have not seen any problem reports from those
    wider used paths so this patch should be fairly safe - for mm
    and wider testing at least.

    Signed-off-by: Mike Christie
    Signed-off-by: FUJITA Tomonori
    Signed-off-by: James Bottomley
    Signed-off-by: Jens Axboe

    Mike Christie
     

22 Nov, 2006

1 commit

  • 65f27f384   WorkStruct: Pass the work_struct pointer instead of context data ... Browse Code »

    Pass the work_struct pointer to the work function rather than context data.
    The work function can use container_of() to work out the data.

    For the cases where the container of the work_struct may go away the moment the
    pending bit is cleared, it is made possible to defer the release of the
    structure by deferring the clearing of the pending bit.

    To make this work, an extra flag is introduced into the management side of the
    work_struct. This governs auto-release of the structure upon execution.

    Ordinarily, the work queue executor would release the work_struct for further
    scheduling or deallocation by clearing the pending bit prior to jumping to the
    work function. This means that, unless the driver makes some guarantee itself
    that the work_struct won't go away, the work function may not access anything
    else in the work_struct or its container lest they be deallocated.. This is a
    problem if the auxiliary data is taken away (as done by the last patch).

    However, if the pending bit is *not* cleared before jumping to the work
    function, then the work function *may* access the work_struct and its container
    with no problems. But then the work function must itself release the
    work_struct by calling work_release().

    In most cases, automatic release is fine, so this is the default. Special
    initiators exist for the non-auto-release case (ending in _NAR).

    Signed-Off-By: David Howells

    David Howells
     

12 Oct, 2006

1 commit

  • bf02c082b   [PATCH] fs/bio.c: tweaks ... Browse Code »

    - Calculate a variable in bvec_alloc_bs() only once needed, not earlier
    (bio.o down from 18408 to 18376 Bytes, 32 Bytes saved, probably due to
    data locality improvements).

    - Init variable idx to silence a gcc warning which already existed in the
    unmodified original base file (bvec_alloc_bs() handles idx correctly, so
    there's no need for the warning):

    fs/bio.c: In function `bio_alloc_bioset':
    fs/bio.c:169: warning: `idx' may be used uninitialized in this function

    Signed-off-by: Andreas Mohr
    Acked-by: Jens Axboe
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Andreas Mohr
     

01 Oct, 2006

2 commits

18 Jun, 2006

1 commit

24 May, 2006

1 commit

27 Mar, 2006

3 commits

  • 93d2341c7   [PATCH] mempool: use mempool_create_slab_pool() ... Browse Code »

    Modify well over a dozen mempool users to call mempool_create_slab_pool()
    rather than calling mempool_create() with extra arguments, saving about 30
    lines of code and increasing readability.

    Signed-off-by: Matthew Dobson
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Matthew Dobson
     
  • 0eaae62ab   [PATCH] mempool: use common mempool kmalloc allocator ... Browse Code »

    This patch changes several mempool users, all of which are basically just
    wrappers around kmalloc(), to use the common mempool_kmalloc/kfree, rather
    than their own wrapper function, removing a bunch of duplicated code.

    Signed-off-by: Matthew Dobson
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Matthew Dobson
     
  • fa3536cc1   [PATCH] Use __read_mostly on some hot fs variables ... Browse Code »

    I discovered on oprofile hunting on a SMP platform that dentry lookups were
    slowed down because d_hash_mask, d_hash_shift and dentry_hashtable were in
    a cache line that contained inodes_stat. So each time inodes_stats is
    changed by a cpu, other cpus have to refill their cache line.

    This patch moves some variables to the __read_mostly section, in order to
    avoid false sharing. RCU dentry lookups can go full speed.

    Signed-off-by: Eric Dumazet
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Eric Dumazet
     

26 Mar, 2006

1 commit

24 Mar, 2006

1 commit

23 Mar, 2006

1 commit

  • b0e6e9629   [PATCH] reduce size of bio mempools ... Browse Code »

    The biovec default mempool limit of 256 entries results in over 3MB of RAM
    being permanently pinned, even on systems with only 128MB of RAM. Since
    mempool tries to allocate from the system pool first, it makes sense to
    reduce the size of the mempool fallbacks to a more reasonable limit of 1-5
    entries -- enough for the system to be able to make progress even under
    load.

    Signed-off-by: Benjamin LaHaise
    Acked-by: Jens Axboe
    Cc: Matt Mackall
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Benjamin LaHaise
     

31 Jan, 2006

1 commit

15 Jan, 2006

1 commit