Eric Lee / smarc-ti-linux-kernel

10 Jul, 2013

2 commits

  • d12e1e50e   ipc/sem.c: replace shared sem_otime with per-semaphore value ... Browse Code »

    sem_otime contains the time of the last semaphore operation that
    completed successfully. Every operation updates this value, thus access
    from multiple cpus can cause thrashing.

    Therefore the patch replaces the variable with a per-semaphore variable.
    The per-array sem_otime is only calculated when required.

    No performance improvement on a single-socket i3 - only important for
    larger systems.

    Signed-off-by: Manfred Spraul
    Cc: Rik van Riel
    Cc: Davidlohr Bueso
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     
  • 1a82e9e1d   ipc/sem: separate wait-for-zero and alter tasks into seperate queues ... Browse Code »

    Introduce separate queues for operations that do not modify the
    semaphore values. Advantages:

    - Simpler logic in check_restart().
    - Faster update_queue(): Right now, all wait-for-zero operations are
    always tested, even if the semaphore value is not 0.
    - wait-for-zero gets again priority, as in linux
    Cc: Rik van Riel
    Cc: Davidlohr Bueso
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     

13 Oct, 2012

1 commit

03 Nov, 2011

2 commits

  • f567a1859   include/linux/sem.h: make sysv_sem empty if SYSVIPC is disabled ... Browse Code »

    For the sysvsem undo, each task struct contains a sysv_sem structure with
    a pointer to the undo information.

    This pointer is only necessary if sysvipc is enabled - thus the pointer
    can be made conditional on CONFIG_SYSVIPC.

    Signed-off-by: Manfred Spraul
    Acked-by: Peter Zijlstra
    Cc: Thomas Gleixner
    Cc: Mike Galbraith
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     
  • e57940d71   ipc/sem.c: remove private structures from public header file ... Browse Code »

    include/linux/sem.h contains several structures that are only used within
    ipc/sem.c.

    The patch moves them into ipc/sem.c - there is no need to expose the
    structures to the whole kernel.

    No functional changes, only whitespace cleanups and 80-char per line
    fixes.

    Signed-off-by: Manfred Spraul
    Acked-by: Peter Zijlstra
    Cc: Thomas Gleixner
    Cc: Mike Galbraith
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Manfred Spraul
     

27 Jul, 2011

1 commit

  • 60063497a   atomic: use <linux/atomic.h> ... Browse Code »

    This allows us to move duplicated code in
    (atomic_inc_not_zero() for now) to

    Signed-off-by: Arun Sharma
    Reviewed-by: Eric Dumazet
    Cc: Ingo Molnar
    Cc: David Miller
    Cc: Eric Dumazet
    Acked-by: Mike Frysinger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arun Sharma