linux/fs/jbd2
Nick Piggin 95c354fe9f spinlock: lockbreak cleanup
The break_lock data structure and code for spinlocks is quite nasty.
Not only does it double the size of a spinlock but it changes locking to
a potentially less optimal trylock.

Put all of that under CONFIG_GENERIC_LOCKBREAK, and introduce a
__raw_spin_is_contended that uses the lock data itself to determine whether
there are waiters on the lock, to be used if CONFIG_GENERIC_LOCKBREAK is
not set.

Rename need_lockbreak to spin_needbreak, make it use spin_is_contended to
decouple it from the spinlock implementation, and make it typesafe (rwlocks
do not have any need_lockbreak sites -- why do they even get bloated up
with that break_lock then?).

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:31:20 +01:00
..
checkpoint.c spinlock: lockbreak cleanup 2008-01-30 13:31:20 +01:00
commit.c spinlock: lockbreak cleanup 2008-01-30 13:31:20 +01:00
journal.c jbd2: Mark jbd2 slabs as SLAB_TEMPORARY 2008-01-28 23:58:27 -05:00
Makefile
recovery.c
revoke.c jbd2: Mark jbd2 slabs as SLAB_TEMPORARY 2008-01-28 23:58:27 -05:00
transaction.c jbd2: sparse pointer use of zero as null 2008-01-28 23:58:27 -05:00