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locking/mutexes: Introduce cancelable MCS lock for adaptive spinning

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Since we want a task waiting for a mutex_lock() to go to sleep and
reschedule on need_resched() we must be able to abort the
mcs_spin_lock() around the adaptive spin.

Therefore implement a cancelable mcs lock.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: chegu_vinod@hp.com
Cc: paulmck@linux.vnet.ibm.com
Cc: Waiman.Long@hp.com
Cc: torvalds@linux-foundation.org
Cc: tglx@linutronix.de
Cc: riel@redhat.com
Cc: akpm@linux-foundation.org
Cc: davidlohr@hp.com
Cc: hpa@zytor.com
Cc: andi@firstfloor.org
Cc: aswin@hp.com
Cc: scott.norton@hp.com
Cc: Jason Low <jason.low2@hp.com>
Link: http://lkml.kernel.org/n/tip-62hcl5wxydmjzd182zhvk89m@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
2014-03-11 12:14:56 +01:00
committed by Ingo Molnar
parent 1d8fe7dc80
commit fb0527bd5e
5 changed files with 202 additions and 7 deletions
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kernel/locking/mcs_spinlock.h
+15
View File
@@ -111,4 +111,19 @@ void mcs_spin_unlock(struct mcs_spinlock **lock, struct mcs_spinlock *node)
arch_mcs_spin_unlock_contended(&next->locked);
}
/*
* Cancellable version of the MCS lock above.
*
* Intended for adaptive spinning of sleeping locks:
* mutex_lock()/rwsem_down_{read,write}() etc.
*/
struct optimistic_spin_queue {
struct optimistic_spin_queue *next, *prev;
int locked; /* 1 if lock acquired */
};
extern bool osq_lock(struct optimistic_spin_queue **lock);
extern void osq_unlock(struct optimistic_spin_queue **lock);
#endif /* __LINUX_MCS_SPINLOCK_H */