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Commit c516610c authored by Jan Kara's avatar Jan Kara
Browse files

quota: Make global quota locks cacheline aligned 



Andrew Morton has suggested that three global quota locks can end up in the
same cacheline which can result in bad cacheline ping-pong on SMP machines.
Make locks cacheline aligned so that we avoid this problem (thanks goes to
Andrew for the idea).

Signed-off-by: default avatarJan Kara <jack@suse.cz>
CC: Andrew Morton <akpm@linux-foundation.org>
parent 884d179d

fs/quota/dquot.c

+3 −3
Original line number Original line Diff line number Diff line
@@ -129,9 +129,9 @@ 
 * i_mutex on quota files is special (it's below dqio_mutex)

 * i_mutex on quota files is special (it's below dqio_mutex)

 */

 */





static DEFINE_SPINLOCK(dq_list_lock);

static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);

static DEFINE_SPINLOCK(dq_state_lock);

static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock);

DEFINE_SPINLOCK(dq_data_lock);

__cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock);

EXPORT_SYMBOL(dq_data_lock);

EXPORT_SYMBOL(dq_data_lock);





static char *quotatypes[] = INITQFNAMES;

static char *quotatypes[] = INITQFNAMES;