Doug / smarc-fsl-linux-kernel

12 Oct, 2007

1 commit

  • e4564f79d   lockdep: fixup mutex annotations ... Browse Code »

    The fancy mutex_lock fastpath has too many indirections to track the caller
    hence all contentions are perceived to come from mutex_lock().

    Avoid this by explicitly not using the fastpath code (it was disabled already
    anyway).

    Signed-off-by: Peter Zijlstra
    Signed-off-by: Ingo Molnar

    Peter Zijlstra
     

20 Jul, 2007

2 commits

  • 96645678c   lockstat: measure lock bouncing ... Browse Code »

    __acquire
    |
    lock _____
    | \
    | __contended
    | |
    | wait
    | _______/
    |/
    |
    __acquired
    |
    __release
    |
    unlock

    We measure acquisition and contention bouncing.

    This is done by recording a cpu stamp in each lock instance.

    Contention bouncing requires the cpu stamp to be set on acquisition. Hence we
    move __acquired into the generic path.

    __acquired is then used to measure acquisition bouncing by comparing the
    current cpu with the old stamp before replacing it.

    __contended is used to measure contention bouncing (only useful for preemptable
    locks)

    [akpm@linux-foundation.org: cleanups]
    Signed-off-by: Peter Zijlstra
    Acked-by: Ingo Molnar
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Peter Zijlstra
     
  • 4fe87745a   lockstat: hook into spinlock_t, rwlock_t, rwsem and mutex ... Browse Code »

    Call the new lockstat tracking functions from the various lock primitives.

    Signed-off-by: Peter Zijlstra
    Acked-by: Ingo Molnar
    Acked-by: Jason Baron
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Peter Zijlstra
     

10 May, 2007

1 commit

  • c9f4f06d3   wrap access to thread_info ... Browse Code »

    Recently a few direct accesses to the thread_info in the task structure snuck
    back, so this wraps them with the appropriate wrapper.

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

    Roman Zippel
     

09 Dec, 2006

1 commit

  • d63a5a74d   [PATCH] lockdep: avoid lockdep warning in md ... Browse Code »

    md_open takes ->reconfig_mutex which causes lockdep to complain. This
    (normally) doesn't have deadlock potential as the possible conflict is with a
    reconfig_mutex in a different device.

    I say "normally" because if a loop were created in the array->member hierarchy
    a deadlock could happen. However that causes bigger problems than a deadlock
    and should be fixed independently.

    So we flag the lock in md_open as a nested lock. This requires defining
    mutex_lock_interruptible_nested.

    Cc: Ingo Molnar
    Acked-by: Peter Zijlstra
    Acked-by: Ingo Molnar
    Signed-off-by: Neil Brown
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    NeilBrown
     

04 Jul, 2006

4 commits

  • ef5d4707b   [PATCH] lockdep: prove mutex locking correctness ... Browse Code »

    Use the lock validator framework to prove mutex locking correctness.

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

    Ingo Molnar
     
  • 9cebb5526   [PATCH] lockdep: mutex section binutils workaround ... Browse Code »

    Work around weird section nesting build bug causing smp-alternatives failures
    under certain circumstances.

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

    Ingo Molnar
     
  • 9a11b49a8   [PATCH] lockdep: better lock debugging ... Browse Code »

    Generic lock debugging:

    - generalized lock debugging framework. For example, a bug in one lock
    subsystem turns off debugging in all lock subsystems.

    - got rid of the caller address passing (__IP__/__IP_DECL__/etc.) from
    the mutex/rtmutex debugging code: it caused way too much prototype
    hackery, and lockdep will give the same information anyway.

    - ability to do silent tests

    - check lock freeing in vfree too.

    - more finegrained debugging options, to allow distributions to
    turn off more expensive debugging features.

    There's no separate 'held mutexes' list anymore - but there's a 'held locks'
    stack within lockdep, which unifies deadlock detection across all lock
    classes. (this is independent of the lockdep validation stuff - lockdep first
    checks whether we are holding a lock already)

    Here are the current debugging options:

    CONFIG_DEBUG_MUTEXES=y
    CONFIG_DEBUG_LOCK_ALLOC=y

    which do:

    config DEBUG_MUTEXES
    bool "Mutex debugging, basic checks"

    config DEBUG_LOCK_ALLOC
    bool "Detect incorrect freeing of live mutexes"

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

    Ingo Molnar
     
  • 9e7f4d451   [PATCH] lockdep: rename DEBUG_WARN_ON() ... Browse Code »

    Rename DEBUG_WARN_ON() to the less generic DEBUG_LOCKS_WARN_ON() name, so that
    it's clear that this is a lock-debugging internal mechanism.

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

    Ingo Molnar
     

27 Jun, 2006

1 commit

11 Jan, 2006

3 commits

10 Jan, 2006

1 commit