Eric Lee / smarc-fsl-linux-kernel

10 Jul, 2007

3 commits

09 May, 2007

2 commits

13 Feb, 2007

1 commit

  • 163da958b   [PATCH] FS: speed up rw_verify_area() ... Browse Code »

    oprofile hunting showed a stall in rw_verify_area(), because of triple
    indirection and potential cache misses.
    (file->f_path.dentry->d_inode->i_flock)

    By moving initialization of 'struct inode' pointer before the pos/count
    sanity tests, we allow the compiler and processor to perform two loads by
    anticipation, reducing stall, without prefetch() hints. Even x86 arch has
    enough registers to not use temporary variables and not increase text size.

    I validated this patch running a bench and studied oprofile changes, and
    absolute perf of the test program.

    Results of my epoll_pipe_bench (source available on request) on a Pentium-M
    1.6 GHz machine

    Before :
    # ./epoll_pipe_bench -l 30 -t 20
    Avg: 436089 evts/sec read_count=8843037 write_count=8843040 21.218390 samples
    per call
    (best value out of 10 runs)

    After :
    # ./epoll_pipe_bench -l 30 -t 20
    Avg: 470980 evts/sec read_count=9549871 write_count=9549894 21.216694 samples
    per call
    (best value out of 10 runs)

    oprofile CPU_CLK_UNHALTED events gave a reduction from 5.3401 % to 2.5851 %
    for the rw_verify_area() function.

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

    Eric Dumazet
     

12 Feb, 2007

1 commit

  • 4b98d11b4   [PATCH] ifdef ->rchar, ->wchar, ->syscr, ->syscw from task_struct ... Browse Code »

    They are fat: 4x8 bytes in task_struct.
    They are uncoditionally updated in every fork, read, write and sendfile.
    They are used only if you have some "extended acct fields feature".

    And please, please, please, read(2) knows about bytes, not characters,
    why it is called "rchar"?

    Signed-off-by: Alexey Dobriyan
    Cc: Jay Lan
    Cc: Balbir Singh
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Alexey Dobriyan
     

14 Dec, 2006

1 commit

09 Dec, 2006

1 commit

  • 0f7fc9e4d   [PATCH] VFS: change struct file to use struct path ... Browse Code »

    This patch changes struct file to use struct path instead of having
    independent pointers to struct dentry and struct vfsmount, and converts all
    users of f_{dentry,vfsmnt} in fs/ to use f_path.{dentry,mnt}.

    Additionally, it adds two #define's to make the transition easier for users of
    the f_dentry and f_vfsmnt.

    Signed-off-by: Josef "Jeff" Sipek
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Josef "Jeff" Sipek
     

01 Oct, 2006

4 commits

  • eed4e51fb   [PATCH] Add vector AIO support ... Browse Code »

    This work is initially done by Zach Brown to add support for vectored aio.
    These are the core changes for AIO to support
    IOCB_CMD_PREADV/IOCB_CMD_PWRITEV.

    [akpm@osdl.org: huge build fix]
    Signed-off-by: Zach Brown
    Signed-off-by: Christoph Hellwig
    Signed-off-by: Badari Pulavarty
    Acked-by: Benjamin LaHaise
    Acked-by: James Morris
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Badari Pulavarty
     
  • 543ade1fc   [PATCH] Streamline generic_file_* interfaces and filemap cleanups ... Browse Code »

    This patch cleans up generic_file_*_read/write() interfaces. Christoph
    Hellwig gave me the idea for this clean ups.

    In a nutshell, all filesystems should set .aio_read/.aio_write methods and use
    do_sync_read/ do_sync_write() as their .read/.write methods. This allows us
    to cleanup all variants of generic_file_* routines.

    Final available interfaces:

    generic_file_aio_read() - read handler
    generic_file_aio_write() - write handler
    generic_file_aio_write_nolock() - no lock write handler

    __generic_file_aio_write_nolock() - internal worker routine

    Signed-off-by: Badari Pulavarty
    Signed-off-by: Christoph Hellwig
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Badari Pulavarty
     
  • ee0b3e671   [PATCH] Remove readv/writev methods and use aio_read/aio_write instead ... Browse Code »

    This patch removes readv() and writev() methods and replaces them with
    aio_read()/aio_write() methods.

    Signed-off-by: Badari Pulavarty
    Signed-off-by: Christoph Hellwig
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Badari Pulavarty
     
  • 027445c37   [PATCH] Vectorize aio_read/aio_write fileop methods ... Browse Code »

    This patch vectorizes aio_read() and aio_write() methods to prepare for
    collapsing all aio & vectored operations into one interface - which is
    aio_read()/aio_write().

    Signed-off-by: Badari Pulavarty
    Signed-off-by: Christoph Hellwig
    Cc: Michael Holzheu
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Badari Pulavarty
     

11 Jul, 2006

1 commit

11 Apr, 2006

1 commit

29 Mar, 2006

1 commit

  • 4b6f5d20b   [PATCH] Make most file operations structs in fs/ const ... Browse Code »

    This is a conversion to make the various file_operations structs in fs/
    const. Basically a regexp job, with a few manual fixups

    The goal is both to increase correctness (harder to accidentally write to
    shared datastructures) and reducing the false sharing of cachelines with
    things that get dirty in .data (while .rodata is nicely read only and thus
    cache clean)

    Signed-off-by: Arjan van de Ven
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arjan van de Ven
     

26 Mar, 2006

1 commit

10 Jan, 2006

1 commit

05 Jan, 2006

1 commit

  • e28cc7157   Relax the rw_verify_area() error checking. ... Browse Code »

    In particular, allow over-large read- or write-requests to be downgraded
    to a more reasonable range, rather than considering them outright errors.

    We want to protect lower layers from (the sadly all too common) overflow
    conditions, but prefer to do so by chopping the requests up, rather than
    just refusing them outright.

    Cc: Peter Anvin
    Cc: Ulrich Drepper
    Cc: Andi Kleen
    Cc: Al Viro
    Signed-off-by: Linus Torvalds

    Linus Torvalds
     

30 Sep, 2005

1 commit

  • 411b67b4b   [PATCH] readv/writev syscalls are not checked by lsm ... Browse Code »

    it seems that readv(2)/writev(2) syscalls do not call
    file_permission callback. Looks like this is overlook.

    I have filled the issue into redhat bugzilla as
    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=169433
    and got the recommendation to post this on lsm mailing list.

    The following trivial patch solves the problem.

    Signed-off-by: Kostik Belousov
    Signed-off-by: Chris Wright

    Kostik Belousov
     

08 Sep, 2005

1 commit

13 Jul, 2005

1 commit

  • 0eeca2830   [PATCH] inotify ... Browse Code »

    inotify is intended to correct the deficiencies of dnotify, particularly
    its inability to scale and its terrible user interface:

    * dnotify requires the opening of one fd per each directory
    that you intend to watch. This quickly results in too many
    open files and pins removable media, preventing unmount.
    * dnotify is directory-based. You only learn about changes to
    directories. Sure, a change to a file in a directory affects
    the directory, but you are then forced to keep a cache of
    stat structures.
    * dnotify's interface to user-space is awful. Signals?

    inotify provides a more usable, simple, powerful solution to file change
    notification:

    * inotify's interface is a system call that returns a fd, not SIGIO.
    You get a single fd, which is select()-able.
    * inotify has an event that says "the filesystem that the item
    you were watching is on was unmounted."
    * inotify can watch directories or files.

    Inotify is currently used by Beagle (a desktop search infrastructure),
    Gamin (a FAM replacement), and other projects.

    See Documentation/filesystems/inotify.txt.

    Signed-off-by: Robert Love
    Cc: John McCutchan
    Cc: Christoph Hellwig
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Robert Love
     

24 Jun, 2005

1 commit

17 Apr, 2005

2 commits

  • 1f08ad023   [PATCH] undo do_readv_writev() behavior change ... Browse Code »

    Bugme bug 4326: http://bugme.osdl.org/show_bug.cgi?id=4326 reports:

    executing the systemcall readv with Bad argument
    ->len == -1) it gives out error EFAULT instead of EINVAL

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

    Dave Hansen
     
  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds